Transmission Control Module Scan Tool Information. Pontiac Solstice 2008

For 1990-2009 cars only

Makes 🢒 Pontiac 🢒 2008 🢒 Solstice 🢒 Diagnostic Navigation 🢒 Vehicle Diagnostic Information 🢒 Transmission Control Module Scan Tool Information

Table 1:	Scan Tool Data Parameters
Table 2:	Scan Tool Output Controls

The Transmission Control Module Scan Tool Data List contains all transmission related parameters that are available on the scan tool. The list is arranged in alphabetical order. A given parameter may appear in any one of the data lists, and in some cases may appear more than once, or in more than one data list in order to group certain related parameters together.

The values below represent a typical display recorded from a properly functioning system.

Important: Do not use a scan tool that displays faulty data. Report the condition to the scan tool manufacturer. The use of a faulty scan tool can result in misdiagnosis and the unnecessary replacement of parts.

Only the parameters listed below are used/referenced in this manual for diagnosis. If a scan tool displays other parameters, those values are not recommended by General Motors for use in diagnosis.

If all values are within the expected range described below, refer to Symptoms - Automatic Transmission for diagnosis.

The scan tool values from a properly functioning transmission may be used for comparison with the transmission you are diagnosing. The values below represent a typical display recorded from a properly functioning system.

Scan Tool Data Parameters

Parameter	System State	Expected Value	Description
Operating Conditions: Engine at idle, upper radiator hose hot, closed throttle, transmission in Park, closed loop operation, accessories OFF, brake pedal not applied.
1-2 Shift Error	--	Seconds, Varies	This parameter displays the difference between the desired 1-2 shift time and the actual 1-2 shift time. A positive number indicates a firm or fast shift, the actual shift time was shorter than the desired shift time. A negative number indicates a soft or slow shift, the actual shift time was longer than the desired shift time. This value is only accurate if the shift was adaptable.
1-2 Shift Time	--	Seconds, Varies	This parameter displays the actual time of the last 1-2 shift. The shift time is based on the engine RPM drop after the commanded 1-2 shift. This value is only accurate if the shift was adaptable.
1-2 Sol.	--	Off	This parameter displays the current commanded state of the shift solenoids. All three of the 5L40-E/5L50-E shift solenoids are normally-closed, which means that no fluid passes through when the solenoid is commanded OFF. When commanded ON, the solenoid opens and allows fluid to flow through. Refer to Shift Solenoid Valve State and Gear Ratio.
1-2 Sol. CKT Status	--	OK	This parameter displays the solenoid valve feedback voltage signal circuit status on the scan tool. If the voltage is low when the solenoid is commanded OFF, the scan tool will display Open/Short to GND. If the voltage is high when the solenoid is commanded ON, the scan tool will display Short to Volts. If no circuit fault is present the scan tool will display OK. Until the circuit has been evaluated, the scan tool will display Indeterminate.
1-2 TAP Cell (4-16)	--	kPa (psi), Varies	This parameter displays the amount of transmission adaptive pressure (TAP), based on 17 N·m (12.5 lb ft) of engine torque increment per cell, added to or subtracted from shift pressure during a 1-2 upshift. A positive number indicates that long shifts have been detected and PC solenoid pressure has been added in order to decrease shift time. A negative number indicates that short shifts have been detected and PC solenoid pressure has been subtracted in order to increase shift time.
2-3 Shift Error	--	Seconds, Varies	This parameter displays the difference between the desired 2-3 shift time and the actual 2-3 shift time. A positive number indicates a firm or fast shift, the actual shift time was shorter than the desired shift time. A negative number indicates a soft or slow shift, the actual shift time was longer than the desired shift time. This value is only accurate if the shift was adaptable.
2-3 Shift Time	--	Seconds, Varies	This parameter displays the actual time of the last 2-3 shift. The shift time is based on the engine RPM drop after the commanded 2-3 shift. This value is only accurate if the shift was adaptable.
2-3 Sol.	--	On	This parameter displays the commanded state of the 2-3 shift solenoid valve. When the transmission is in FIRST and SECOND gear, the display should indicate OFF, current is not flowing through the solenoid. When the transmission is in THIRD and FOURTH gear, the display should indicate ON, current is flowing through the solenoid.
2-3 Sol. CKT Status	--	OK	This parameter displays the solenoid valve feedback voltage signal circuit status on the scan tool. If the voltage is low when the solenoid is commanded OFF, the scan tool will display Open/Short to GND. If the voltage is high when the solenoid is commanded ON, the scan tool will display Short to Volts. If no circuit fault is present the scan tool will display OK. Until the circuit has been evaluated, the scan tool will display Indeterminate.
2-3 TAP Cell (4-16)	--	kPa (psi), Varies	This parameter displays the amount of transmission adaptive pressure (TAP), based on 17 N·m (12.5 lb ft) of engine torque increment per cell, added to or subtracted from shift pressure during a 2-3 upshift. A positive number indicates that long shifts have been detected and PC solenoid pressure has been added in order to decrease shift time. A negative number indicates that short shifts have been detected and PC solenoid pressure has been subtracted in order to increase shift time.
3-4 Shift Error	--	Seconds, Varies	This parameter displays the difference between the desired 3-4 shift time and the actual 3-4 shift time. A positive number indicates a firm or fast shift, the actual shift time was shorter than the desired shift time. A negative number indicates a soft or slow shift, the actual shift time was longer than the desired shift time. This value is only accurate if the shift was adaptable.
3-4 Shift Time	--	Seconds, Varies	This parameter displays the actual time of the last 3-4 shift. The shift time is based on the engine RPM drop after the commanded 3-4 shift. This value is only accurate if the shift was adaptable.
3-4 TAP Cell (4-16)	--	kPa (psi), Varies	This parameter displays the amount of transmission adaptive pressure (TAP), based on 17 N·m (12.5 lb ft) of engine torque increment per cell, added to or subtracted from shift pressure during a 3-4 upshift. A positive number indicates that long shifts have been detected and PC solenoid pressure has been added in order to decrease shift time. A negative number indicates that short shifts have been detected and PC solenoid pressure has been subtracted in order to increase shift time.
4-5 Shift Error	--	Seconds, Varies	This parameter displays the difference between the desired 4-5 shift time and the actual 4-5 shift time. A positive number indicates a firm or fast shift, the actual shift time was shorter than the desired shift time. A negative number indicates a soft or slow shift, the actual shift time was longer than the desired shift time. This value is only accurate if the shift was adaptable.
4-5 Shift Time	--	Seconds, Varies	This parameter displays the actual time of the last adaptable 4-5 shift. The actual shift time is obtained by measuring the time required for the input shaft to decelerate from the previous ratio to the current ratio.
4-5 Sol.	--	Off	This parameter indicates the current commanded state of the shift solenoids. All three of the 5L40-E/5L50-E shift solenoids are normally-closed, which means that no fluid passes through when the solenoid is commanded OFF. When the solenoid is commanded ON, the solenoid opens and allows fluid to flow through.
4-5 Sol. CKT Status	--	OK	This parameter displays the solenoid driver feedback voltage signal and displays the circuit status on the scan tool. If the voltage is low when the solenoid is commanded OFF, the scan tool will display Open/Short to GND. If the voltage is high when the solenoid is commanded ON, the scan tool will display Short to Volts.
4-5 TAP Cell (4-16)	--	kPa (psi), Varies	This parameter displays the amount of transmission adaptive pressure (TAP), based on 17 N·m (12.5 lb ft) of engine torque increment per cell, added to or subtracted from shift pressure during a 4-5 upshift. A positive number indicates that long shifts have been detected and PC solenoid pressure has been added in order to decrease shift time. A negative number indicates that short shifts have been detected and PC solenoid pressure has been subtracted in order to increase shift time.
A/C Clutch	--	Off	This parameter displays the commanded state of the air conditioning (A/C) compressor clutch relay driver circuit and displays On or Off. The A/C compressor clutch should be engaged when On displays. When the display indicates On, the line pressure and the shift times will be adjusted for the additional engine load.
Brake Switch	--	Released	This parameter displays the status of the brake switch circuit input. APPLIED indicates a zero voltage input, brake pedal applied. RELEASED indicates a voltage input, brake pedal released. The scan tool displays APPLIED or RELEASED.
Commanded Gear	--	1	This parameter displays the current commanded state of the shift solenoid valves. The scan tool displays 1,2,3,4 or 5.
Cruise	--	Disabled	This parameter displays the commanded state of the cruise control system. The scan tool displays ENABLED or DISABLED. When the display indicates ENABLED, the engine control module (ECM) is allowing cruise control operation. When the display indicates DISABLED, the ECM has disabled cruise control operation. The transmission control module (TCM) modifies upshift and downshift patterns when cruise control is enabled.
Current TAP Cell	--	4-16, Varies	This parameter displays the current transmission adaptive pressure (TAP) cell in use for transmission line pressure adaptation. The cells are based on 17 N·m (12.5 lb ft) of engine torque. The higher the engine torque, the higher the current TAP cell. The last cell used will remain displayed until the next adaptable upshift occurs.
Driver Shift Control	--	Inactive	This parameter displays Active or Inactive. The scan tool displays Active when the gear selector is in the manual (M) position which enables TAP Shift. The scan tool displays Inactive when the gear selector is not in the (M) position, TAP Shift disabled.
Driver Shift Request	--	None	This parameter displays the current request from the TAP Shift System. This parameter will display up shift, downshift or invalid depending on the amount of voltage measured at the remote shift selector input and also will display none when there is no request.
ECT	--	°C (°F), Varies	This parameter displays the input signal from the engine coolant temperature (ECT) sensor. The scan tool displays -40 to +151°C (-40 to +304°F). When the ECT is high at 151°C (304°F), the signal voltage is low, 0 V. When the ECT is low at -40°C (-40°F), the signal voltage is high, 5 V. The ECM sends the ECT information to the transmission control module (TCM) via the high speed GMLAN serial data line.
Engine Speed	--	RPM, Varies	This parameter displays the engine speed, based on a signal from the engine control module (ECM). The scan tool displays engine speed in revolutions per minute (RPM). The ECM sends the RPM information to the transmission control module (TCM) via the high speed GMLAN serial data line.
Engine Torque	--	N·m, Varies	This parameter displays the estimated amount of torque that is delivered from the engine. The scan tool displays engine torque in N-m (lb-ft). The ECM sends the engine torque information to the TCM via the high speed GMLAN serial data line.
Gear Ratio	--	Ratio, Varies	This parameter displays the actual transmission gear ratio. The scan tool displays the gear ratio calculated from the automatic transmission input shaft speed sensor (AT ISS) and the automatic transmission output shaft speed sensor (AT OSS) inputs.
High Side Driver 1	--	Enabled	This parameter displays the High Side Driver 1 status on the scan tool. When the High Side Driver 1 is commanded OFF this displays Disabled, when the High Side Driver 1 is commanded ON this displays Enabled.
High Side Driver 1 CKT Status	--	OK	This parameter displays the High Side Driver 1 circuit status on the scan tool. If the voltage is low when the solenoid is commanded OFF, the scan tool will display Open/Short to GND. If the voltage is high when the solenoid is commanded ON, the scan tool will display Short to Volts. If no circuit fault is present the scan tool will display OK.
High Side Driver 2	--	Enabled	This parameter displays the High Side Driver 2 status on the scan tool. When the High Side Driver 2 is commanded OFF this displays Disabled, when the High Side Driver 2 is commanded ON this displays Enabled.
High Side Driver 2 CKT Status	--	OK	This parameter displays the High Side Driver 2 circuit status on the scan tool. If the voltage is low when the solenoid is commanded OFF, the scan tool will display Open/Short to GND. If the voltage is high when the solenoid is commanded ON, the scan tool will display Short to Volts. If no circuit fault is present the scan tool will display OK.
Ignition Voltage	--	Volts, 12-14	This parameter displays the system voltage measured at the ignition feed.
IMS	--	Park	This parameter displays PARK, PARK/REVERSE, REVERSE, REVERSE/NEUTRAL, NEUTRAL, NEUTRAL/DRIVE 5, DRIVE 5, DRIVE 5/DRIVE 4, DRIVE 4, DRIVE 4/DRIVE 3, DRIVE 3, DRIVE 3/DRIVE 2, DRIVE 2, or INVALID. The IMS Range display represents a decoded status of the four inputs from the IMS. The combination of IMS inputs are used to determine which position the manual valve is in at any time.
IMS A/B/C/P	--	High/Low/Low/High	This parameter displays the status of the four A/B/C/P inputs from the automatic transmission internal mode switch. I indicates an ignition voltage signal. LOW indicates a 0 voltage signal. The scan tool will display HI/LOW, HI/LOW, HI/LOW, HI/LOW.
Last Shift Time	--	Seconds, Varies	This parameter displays the actual time of the last upshift. This value is only accurate if the shift was adaptable.
PC Sol. Actual Current	--	Amps, Varies	This parameter displays the actual current flow through the pressure control solenoid circuit which is measured by the control module. High current flow results in low line pressure. Low current flow results in high line pressure.
PC Sol. Duty Cycle	--	%, Varies	This parameter displays the commanded state of the pressure control solenoid expressed as a percentage of energized ON time. A reading of low percent indicates zero ON time, non energized, or no current flow. A high percent at idle indicates maximum ON time, energized, or high current flow.
PC Sol. Ref. Current	--	Amps, Varies	This parameter displays the commanded current of the pressure control solenoid circuit. High current results in low line pressure. Low current results in high line pressure.
Steady State TAP 1 GR	--	kPa (psi), Varies	This parameter displays a pressure modification which is added to the line pressure in 1st gear. The larger the value, the greater the increase to line pressure.
Steady State TAP 1 GR/TCC	--	kPa (psi), Varies	This parameter displays a pressure modification which is added to the line pressure in 1st gear with TCC applied. The larger the value, the greater the increase to line pressure.
Steady State TAP 2 GR	--	kPa (psi), Varies	This parameter displays a pressure modification which is added to the line pressure in 2nd gear. The larger the value, the greater the increase to line pressure.
Steady State TAP 2 GR/TCC	--	kPa (psi), Varies	This parameter displays a pressure modification which is added to the line pressure in 2nd gear with TCC applied. The larger the value, the greater the increase to line pressure.
Steady State TAP 3 GR	--	kPa (psi), Varies	This parameter displays a pressure modification which is added to the line pressure in 3rd gear. The larger the value, the greater the increase to line pressure.
Steady State TAP 3 GR/TCC	--	kPa (psi), Varies	This parameter displays a pressure modification which is added to the line pressure in 3rd gear with TCC applied. The larger the value, the greater the increase to line pressure.
Steady State TAP 4 GR	--	kPa (psi), Varies	This parameter displays a pressure modification which is added to the line pressure in 4th gear. The larger the value, the greater the increase to line pressure.
Steady State TAP 4 GR/TCC	--	kPa (psi), Varies	This parameter displays a pressure modification which is added to the line pressure in 4th gear with TCC applied. The larger the value, the greater the increase to line pressure.
Steady State TAP 5 GR	--	kPa (psi), Varies	This parameter displays a pressure modification which is added to the line pressure in 5th gear. The larger the value, the greater the increase to line pressure.
Steady State TAP 5 GR/TCC	--	kPa (psi), Varies	This parameter displays a pressure modification which is added to the line pressure in 5th gear with TCC applied. The larger the value, the greater the increase to line pressure.
Steady State TAP Reverse	--	kPa (psi), Varies	This parameter displays a pressure modification which is added to the line pressure in Reverse gear. The larger the value, the greater the increase to line pressure.
TCC Duty Cycle	--	%, Varies	This parameter displays the commanded percentage of ON time for the TCC PWM solenoid. A high percentage represents an ON, energized, commanded state. 0 percent represents an OFF, non-energized, commanded state.
TCC Duty Cycle CKT Status	--	OK	This parameter displays the solenoid driver feedback voltage signal and displays the circuit status on the scan tool. If the voltage is low when the solenoid is commanded OFF, the scan tool will display Open/Short to GND. If the voltage is high when the solenoid is commanded ON, the scan tool will display Short to Volts. If no circuit fault is present the scan tool will display OK. Until the circuit has been evaluated, the scan tool will display Indeterminate.
TCC Slip Speed	--	RPM, Varies	This parameter displays the difference between transmission input speed and engine speed. A negative value indicates that the engine speed is less than the input speed, deceleration. A positive value indicates that the engine speed is greater than the input speed, acceleration. A value of zero indicates that the engine speed is equal to the input speed, TCC applied.
TP Angle	--	%, Varies	This parameter displays a percentage that is calculated based on TP sensor voltage. The TP angle should display 0 percent at idle and 100 percent at wide open throttle (WOT).
Traction Control	--	Inactive	This parameter displays Active or Inactive. When the TCM receives a request for torque reduction from the electronic brake traction control module (EBTCM), Active is displayed.
Trans. Fluid Temp.	--	°C (°F), Varies	This parameter displays the input signal of the transmission fluid temperature sensor. Transmission fluid temperature is high 151°C (304°F) when signal voltage is low, 0 volt, and transmission fluid temperature is low -40°C (-40°F ) when signal voltage is high, 5 volt.
Trans. Oil Life	--	%, Varies	This parameter displays the transmission oil life remaining. The scan tool displays remaining oil life in percentage. The transmission oil life is calculations is based on transmission fluid temperature and engine run time.
Transmission Hot Mode	--	Off	This parameter displays the automatic transmission fluid temperature (TFT) and displays On or Off. Off indicates that the TFT has not exceeded 130°C (266°F). On indicates that the TFT has exceeded 130°C (266°F) and has not cooled to 120°C (248°F) for more than 5 seconds. These numbers are approximate and differ with transmissions.
Transmission ISS	--	RPM, Varies	This parameter displays the rotational speed of the transmission input shaft. The scan tool displays input shaft speed as revolutions per minute (RPM).
Transmission OSS	--	RPM, Varies	This parameter displays the rotational speed of the transmission output shaft. The scan tool displays output shaft speed as revolutions per minute (RPM). On four-wheel drive applications, the transfer case output shaft speed is measured.

Scan Tool Output Controls

Output Control

Description

1-2 Solenoid

•

The transmission control module (TCM) commands the 1-2 shift solenoid valve ON and OFF. The scan tool 1-2 Sol. parameter should match the commanded state. The scan tool Commanded Gear parameter should correspond with the shift solenoid combination. Refer to Shift Solenoid Valve State and Gear Ratio .

•	When the ignition is ON, and the engine is OFF, there are no limits to this control. The solenoid remains ON until commanded OFF, and vice versa. When the output control is exited, the solenoid state is determined by the TCM.

•	When the engine is running, the following control limits apply:

-	Only sequential gear changes are allowed. For example, 1st to 3rd is not allowed. If a non-sequential gear change is attempted, the message "Non-sequential gear changes not allowed. Gear changes must be in order" appears on the scan tool display.

-	The vehicle speed must be below a calibrated value. If the vehicle speed is too high, the message "Vehicle speed too high" appears on the scan tool display.

-	The engine speed must be below a calibrated value. If the engine speed is too high, the message "Engine speed too high" appears on the scan tool display.

-	Downshifts are allowed only when the vehicle speed is below a calibrated value. If the vehicle speed is too high, the message "Eng. is on and veh. speed too hi for 3-2 or 2-1 downshift" appears on the scan tool display.

The gear requested may not be greater than the current selected transmission range. For example, 3rd gear is not allowed if the transmission range is D1. If the gear requested is greater than the current selected transmission range, the message "Eng. running and gear request is greater than the current TR" appears on the scan tool display.

-	The solenoid remains ON until commanded OFF, and vice versa. When the output control is exited, the solenoid state is determined by the TCM.

2-3 Solenoid

•	The TCM commands the 2-3 shift solenoid valve ON and OFF. The scan tool 2-3 Sol. parameter should match the commanded state. The scan tool Commanded Gear parameter should correspond with the shift solenoid combination. Refer to Shift Solenoid Valve State and Gear Ratio .

•	When the ignition is ON, and the engine is OFF, there are no limits to this control. The solenoid will remain ON until commanded OFF, and vice versa. When the output control is exited, the solenoid state is determined by the TCM.

•	When the engine is running, the following control limits apply:

-	Only sequential gear changes are allowed. For example, 1st to 3rd is not allowed. If a non-sequential gear change is attempted, the message "Non-sequential gear changes not allowed. Gear changes must be in order" appears on the scan tool display.

-	The vehicle speed must be below a calibrated value. If the vehicle speed is too high, the message "Vehicle speed too high" appears on the scan tool display.

-	The engine speed must be below a calibrated value. If the engine speed is too high, the message "Engine speed too high" appears on the scan tool display.

-	Downshifts are allowed only when the vehicle speed is below a calibrated value. If the vehicle speed is too high, the message "Eng. is on and veh. speed too hi for 3-2 or 2-1 downshift" appears on the scan tool display.

The gear requested may not be greater than the current selected transmission range. For example, 3rd gear is not allowed if the transmission range is D2. If the gear requested is greater than the current selected transmission range, the message "Eng. running and gear request is greater than the current TR" appears on the scan tool display.

-	The solenoid remains ON until commanded OFF, and vice versa. When the output control is exited, the solenoid state is determined by the TCM.

4-5 Solenoid

•	The TCM commands the 4-5 shift solenoid valve ON and OFF. The scan tool 4-5 Sol. parameter should match the commanded state. The scan tool Commanded Gear parameter should correspond with the shift solenoid combination. Refer to Shift Solenoid Valve State and Gear Ratio .

•	When the ignition is ON, and the engine is OFF, there are no limits to this control. The solenoid will remain ON until commanded OFF, and vice versa. When the output control is exited, the solenoid state is determined by the TCM.

•	When the engine is running, the following control limits apply:

-	Only sequential gear changes are allowed. For example, 1st to 3rd is not allowed. If a non-sequential gear change is attempted, the message "Non-sequential gear changes not allowed. Gear changes must be in order" appears on the scan tool display.

-	The vehicle speed must be below a calibrated value. If the vehicle speed is too high, the message "Vehicle speed too high" appears on the scan tool display.

-	The engine speed must be below a calibrated value. If the engine speed is too high, the message "Engine speed too high" appears on the scan tool display.

-	Downshifts are allowed only when the vehicle speed is below a calibrated value. If the vehicle speed is too high, the message "Eng. is on and veh. speed too hi for 3-2 or 2-1 downshift" appears on the scan tool display.

-	The solenoid remains ON until commanded OFF, and vice versa. When the output control is exited, the solenoid state is determined by the TCM.

High Side Driver 1

•	The TCM commands the driver for the solenoid voltage supply ON and OFF.

•	When the ignition is ON, and the engine is OFF, there are no limits to this control.

•	High side driver 1 may not be commanded ON and OFF with the scan tool if the engine is running.

High Side Driver 2

•	The TCM commands the driver for the solenoid voltage supply ON and OFF.

•	When the ignition is ON, and the engine is OFF, there are no limits to this control.

•	High side driver 2 may not be commanded ON and OFF with the scan tool if the engine is running.

PC Solenoid

•

The TCM commands the amperage to the pressure control solenoid in order to control transmission line pressure. As the amperage increases, the line pressure decreases. As the amperage decreases, the line pressure increases. The amperage range is 0.10-1.10 and may be commanded in one-tenth amp increments.

•	When the ignition is ON, and the engine is OFF, the reference, commanded, amperage may be controlled within calibrated limits. The scan tool parameter "PC Sol. Ref. Current" changes, but the parameter "PC Sol. Actual Current" does not change. The reference current remains until commanded otherwise.

•	When the engine is running, the following control limits apply:

When the transmission range is Park or Neutral, the reference, commanded, amperage may be controlled within calibrated limits. The engine speed must be less than 1,500 RPM. If the engine speed is greater than 1,500 RPM, the message "TR in park/neutral and engine speed over 1,500 RPM" appears on the scan tool display. Both the scan tool parameters "PC Sol. Ref. Current" and "PC Sol. Actual Current" change. Both current readings remain until commanded otherwise.

When the transmission range is not in Park or Neutral, the reference amperage can only be controlled less than the current determined by the TCM. The TCM does not allow a value to be selected that may cause damage to the transmission. If the requested amperage is more than allowed by the TCM, the message "Requested current for the PC Solenoid is too high" appears on the scan tool display.

-	Transmission IMS DTCs must not be active. If a transmission IMS DTC is active, the message "Engine running with transmission DTC present" appears on the scan tool display.

Reset Transmission Adapts

•	The TCM clears, or resets, all TAP cells to zero.

•	There are no limits to using this control. It may be performed with the engine running or when the ignition is ON, and the engine is OFF.

Reset Transmission Oil Life

•	The TCM resets the amount of oil life remaining to 100 percent.

•	There are no limits to using this output control. It may be performed with the engine running or when the ignition is ON, and the engine is OFF.

Shift Transmission

•	The TCM commands upshifts and downshifts. The scan tool Commanded Gear parameter should correspond with the shift solenoid combination. Refer to Shift Solenoid Valve State and Gear Ratio .

•	When the ignition is ON, and the engine is OFF, there are no limits to this control. The scan tool shift solenoid states change to match the Commanded Gear selected.

•	When the engine is running, the following control limits apply:

-	The TCM does not allow a shift if it causes the engine RPM to exceed a calibrated limit. If a gear is requested and the engine speed is too high, the message "Engine speed too high" appears on the scan tool display.

-	The TCM does not allow a 3-2 or 2-1 downshift if the vehicle speed exceeds a calibrated limit. If either downshift is requested and the vehicle speed is too high, the message "Eng. is on and veh. speed too hi for 3-2 or 2-1 downshift" appears on the scan tool display.

-	The TCM does not allow a 4-3 downshift if the vehicle speed exceeds a calibrated limit. If a 4-3 downshift is requested and the vehicle speed is too high, the message "Vehicle speed too high" appears on the scan tool display.

-	The TCM does not allow an upshift if the vehicle speed exceeds a calibrated limit. If an upshift is requested and the vehicle speed is too high, the message "Vehicle speed too high" appears on the scan tool display.

The TCM does not allow an upshift that is greater than the current selected transmission range. For example 3rd gear is not allowed if the transmission range is D2. If an upshift is requested that is greater than the current selected transmission range, the message "Eng. running and gear request is greater than the current TR" appears on the scan tool display.

Torque Converter Clutch (TCC) Control Solenoid

•

The TCM commands the duty cycle of the TCC PWM solenoid. The duty cycle is represented by a percentage of ON, energized, time. Approximately 90-100 percent duty cycle represents an ON, energized, commanded state. Zero percent represents an OFF, non-energized, commanded state. The scan tool TCC Duty Cycle parameter should match the commanded state.

•	When the ignition is ON, and the engine is OFF, there are no limits to this control. The solenoid remains ON, 90-100 percent duty cycle until commanded OFF, zero percent duty cycle, and vice versa. When the output control is exited, the solenoid duty cycle is determined by the TCM.

•	When the engine is running, the following control limits apply:

-	If the transmission range is Park, and the transmission is in hot mode, the TCC control solenoid may not be commanded OFF. If the solenoid is requested OFF, the message "TCC OFF command disabled in Hot Mode" appears on the scan tool display.

-	The TCC control solenoid may not be commanded OFF for more than a calibrated amount of time. If the solenoid is commanded OFF, for a certain amount of time, the message "TCC OFF time has been exceeded" appears on the scan tool display.