Cruise Control Inoperative/Malfunctioning non 4.2L
Diagnostic Aids
| • | Inspect for proper operation of the stop lamps. Refer to Exterior Lighting Systems Description and Operation . |
| • | Ensure that the following cruise control switches are not stuck or sticking in the engaged position: |
| - | Set/Coast |
| - | Resume/Accel |
| • | For an intermittent condition, refer to Testing for Intermittent Conditions and Poor Connections . |
Conditions for Enabling Cruise Control
| • | The vehicle speed is greater than 40 km/h (25 mph). |
| • | The vehicle is not in PARK, REVERSE, NEUTRAL, or 1st gear. |
| • | The system voltage is between 12-16 volts. |
Step | Action | Yes | No | ||||||
|---|---|---|---|---|---|---|---|---|---|
Schematic Reference : Cruise Control Schematics Connector End View Reference: Engine Control Module Connector End Views | |||||||||
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | |||||||
2 |
Does the Cruise ON/OFF switch parameter display OFF? | Go to Step 3 | Go to Step 8 | ||||||
3 | With the scan tool, observe the following cruise control switch parameters in the engine control module (ECM) Cruise Control Data list:
Do any of the cruise control switch parameters listed above display Applied? | Go to Step 9 | Go to Step 4 | ||||||
4 |
Does the Cruise ON/OFF switch parameter display ON? | Go to Step 5 | Go to Step 10 | ||||||
5 |
Does the Cruise Set/Coast Switch parameter display Applied? | Go to Step 6 | Go to Step 13 | ||||||
6 |
Does the Cruise Resume/Accel. Switch parameter display Applied? | Go to Step 7 | Go to Step 12 | ||||||
7 | Do the stop lamps work properly? | Go to Step 22 | Go to Stop Lamps Always On or Go to Stop Lamps Inoperative | ||||||
8 |
Does the Cruise ON/OFF switch parameter display ON? | Go to Step 14 | Go to Step 19 | ||||||
9 |
Do any of the cruise control switch parameters listed above display Applied? | Go to Step 15 | Go to Step 19 | ||||||
10 |
Does the test lamp illuminate? | Go to Step 11 | Go to Step 21 | ||||||
11 |
Does the Cruise ON/OFF switch parameter display ON? | Go to Step 19 | Go to Step 16 | ||||||
12 |
Does the Cruise Resume/Accel. Switch parameter display Applied? | Go to Step 19 | Go to Step 18 | ||||||
13 |
Does the Cruise Set/Coast Switch parameter display Applied? | Go to Step 19 | Go to Step 17 | ||||||
14 | Test the cruise control on switch signal circuit for a short to voltage. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 25 | Go to Step 20 | ||||||
15 | Test the cruise control switch signal circuit that displayed Applied on the scan tool for a short to voltage. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 25 | Go to Step 20 | ||||||
16 | Test the cruise control on switch signal circuit for the following:
Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 25 | Go to Step 20 | ||||||
17 | Test the cruise control set/coast switch signal circuit for the following:
Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 25 | Go to Step 20 | ||||||
18 | Test the cruise control resume/accelerate switch signal circuit for the following:
Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 25 | Go to Step 20 | ||||||
19 | Inspect for poor connections at C4 of the multifunction, turn signal switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 25 | Go to Step 23 | ||||||
20 | Inspect for poor connections at the harness connector of the ECM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 25 | Go to Step 24 | ||||||
21 | Repair the following in the ignition 3 voltage circuit:
Refer to Circuit Testing and Wiring Repairs . Did you complete the repair? | Go to Step 25 | -- | ||||||
22 | Repair the open or the high resistance in the center high mounted stop lamp (CHMSL) supply voltage circuit. Refer to Circuit Testing and Wiring Repairs . Did you complete the repair? | Go to Step 25 | -- | ||||||
23 | Replace the cruise control switch. Refer to Turn Signal Multifunction Switch Replacement . Did you complete the replacement? | Go to Step 25 | -- | ||||||
24 | Replace the ECM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | Go to Step 25 | -- | ||||||
25 | Operate the vehicle within the conditions for cruise control operation. Does the cruise control system operate properly? | System OK | Go to Step 2 | ||||||
Cruise Control Inoperative/Malfunctioning 4.2L
Diagnostic Aids
Perform the following in order to avoid misdiagnosis:
| • | Inspect for proper operation of the stop lamps. Refer to Exterior Lighting Systems Description and Operation . |
| • | Electromagnetic interference (EMI) on the speed sensor signal circuit may cause erratic cruise control operation. |
For an intermittent condition, refer to Testing for Intermittent Conditions and Poor Connections .
Conditions for Enabling Cruise Control
| • | The vehicle speed is greater than 40 km/h (25 mph). |
| • | The vehicle is not in PARK, REVERSE, NEUTRAL, or 1st gear. |
| • | The system voltage is between 12-16 volts. |
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference : Cruise Control Schematics Connector End View Reference: Powertrain Control Module Connector End Views | |||
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | |
2 |
Does the Cruise ON/OFF switch parameter display OFF? | Go to Step 3 | Go to Step 6 |
3 |
Does the Cruise ON/OFF switch parameter display ON? | Go to Step 4 | Go to Step 7 |
4 |
Does the Cruise Set/Coast Switch parameter display ON? | Go to Step 5 | Go to Step 13 |
5 |
Does the Cruise Resume/Accel. Switch parameter display ON? | Go to Diagnostic Aids | Go to Step 14 |
6 |
Does the Cruise ON/OFF switch parameter display ON? | Go to Step 8 | Go to Step 16 |
7 |
Does the test lamp illuminate? | Go to Step 12 | Go to Step 9 |
8 | Test the cruise control on switch signal circuit for a short to voltage. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 20 | Go to Step 17 |
9 | Test the cruise control on switch signal circuit for a short to ground. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 20 | Go to Step 10 |
10 | Test the cruise control set/coast switch signal circuit for a short to ground. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 20 | Go to Step 11 |
11 | Test the cruise control resume/accelerate switch signal circuit for a short to ground. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 20 | Go to Step 15 |
12 | Test the cruise control on switch signal circuit for an open or for a high resistance. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 20 | Go to Step 16 |
13 | Test the cruise control set/coast signal circuit for an open or for a high resistance. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 20 | Go to Step 16 |
14 | Test the cruise control resume/accelerate signal circuit for an open or for a high resistance. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 20 | Go to Step 16 |
15 | Repair the open, the high resistance, or the short to ground in the ignition 3 voltage circuit. Refer to Wiring Repairs . Did you complete the repair? | Go to Step 20 | -- |
16 | Inspect for poor connections at the harness connector of the multifunction turn signal lever. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 20 | Go to Step 18 |
17 | Inspect for poor connections at the harness connector of the PCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 20 | Go to Step 19 |
18 | Replace the multifunction turn signal lever. Refer to Turn Signal Multifunction Switch Replacement . Did you complete the replacement? | Go to Step 20 | -- |
19 | Replace the PCM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | Go to Step 20 | -- |
20 | Operate the vehicle within the conditions for cruise control operation. Does the cruise control system operate properly? | System OK | Go to Step 2 |
