Fuel Injector Solenoid Coil Test - Engine Coolant Temperature Between 10-35 Degrees C (50-95 Degrees F). Pontiac Grand Prix 2000

For 1990-2009 cars only

Makes 🢒 Pontiac 🢒 2000 🢒 Grand Prix 🢒 Body and Accessories 🢒 Wiring Systems 🢒 Fuel Injector Solenoid Coil Test - Engine Coolant Temperature Between 10-35 Degrees C (50-95 Degrees F)

Table 1:	Example
Table 2:	Engine Coolant Temperature Outside 10°C - 35°C (50°F - 95°F) Test Procedure

Diagnostic Aids

Example

Highest Voltage Reading		Acceptable Subtracted Value Above/Below 10°C-35°C (50°F-95°F)
7.1 Volts		0.6 Volts
Injector Number	Voltage	Subtracted Value	Pass/Fail
1	9.8	F
2	6.6	0.5	P
3	6.9	0.2	P
4	5.8	1.3	F
5	7.0	0.1	P
6	7.1	0.0	P

Test Description

The numbers below refer to the step numbers on the diagnostic table:

The engine coolant temperature (ECT) affects the ability of the fuel injector tester to detect a faulty fuel injector. If the ECT is NOT outside the range of 10°C-35°C (50°F-95°F), go to Fuel Injector Coil Test Procedure--Engine Coolant Temperature Between 10°C-35°C (50°F-95°F).

During the first second, the voltage that is displayed by the DMM may be inaccurate due to the initial current surge. Record the lowest voltage that the DMM displays after the first second of the test. The voltage that the DMM displays may increase throughout the test when the fuel injector windings warm, and when the resistance of the fuel injector windings changes. An erratic voltage reading, or large fluctuations in voltage that do not stabilize, indicates an intermittent connection within the fuel injector. From the recorded voltages, identify the highest voltage, excluding any voltages that are more than 9.5 volts. Subtract each voltage that is less than 9.5 volts from the highest voltage. Record each subtracted value. Refer to the example below. The subtracted value for any fuel injector must not exceed 0.6 volt. A fuel injector with a subtracted value that is more than 0.7 volt is considered faulty, and must be replaced. A fuel injector with a recorded voltage that is more than 9.5 volts is also considered faulty, and must be replaced.

Engine Coolant Temperature Outside 10°C - 35°C (50°F - 95°F) Test Procedure

Step	Action	Value(s)	Yes	No
1	Did you perform the Powertrain On-Board Diagnostic (OBD) System Check?	--	Go to Step 2	Go to Powertrain On Board Diagnostic (OBD) System Check
2 2	Turn ON the ignition, with the engine OFF Use a scan tool in order to monitor the ECT parameter. Is the temperature outside the specified value?	10°C-35°C (50°F-95°F)	Go to Step 3	Go to Fuel Injector Solenoid Coil Test - Engine Coolant Temperature Outside 10-35 Degrees C (50-95 Degrees F) .
3 3	Important: The fuel system must not be pressurized. Relieve the fuel pressure. Refer to Fuel Pressure Relief Disconnect the fuel injector connector. Install the J 39021 Fuel Injector Coil/Balance Tester. Select the coil test 0.5 AMP position on the fuel injector tester. Connect the DMM leads to the fuel injector tester, and select the DC voltage tenths scale. Press the PUSH TO START TEST button on the Fuel Injector Coil/Balance Tester. After the first second of the test, record the lowest voltage. Repeat these steps for each injector. Does any fuel injector have an erratic reading, or have a reading that is more than the specified value?	9.5 Volts	Go to Step 5	Go to Step 4
4	From the recorded readings, identify the highest voltage. Subtract all other voltage readings from the highest recorded voltage. Does any subtracted value exceed the specified value?	0.6 Volts	Go to Step 5	Go to Fuel Injector Balance Test
5	Replace the faulty fuel injectors. Refer to Fuel Injector Replacement . Did you complete the replacement	--	Go to Step 6	--
6	Does any driveability condition still exist?	--	Go to Applicable Diagnostic	System OK