Cruise Control Inoperative/Malfunctioning 2.2L
Diagnostic Aids
Caution: Refer to SIR Caution in the Preface section.
Disable the inflatable restraint steering wheel module when performing this diagnostic table. Refer to SIR Disabling and Enabling in SIR.
In order to avoid misdiagnosis, inspect for the following:
| • | Proper operation of the brake lamps. Refer to Exterior Lighting Systems Description and Operation in Wiring Systems. |
| • | Rotate the steering wheel to both steering stops and activate each cruise control switch separately. With a scan tool, observe the Cruise Control Switch parameter in the body control module (BCM) Cruise Control data list. This will help eliminate the possibility of a internally open or shorted inflatable restraint steering wheel module coil. |
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 in Wiring Systems.
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 within 9-16 volts. |
| • | The park brake is not applied. |
Test Description
The number below refers to the step number on the diagnostic table.
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Cruise Control Schematics Connector End View Reference: Powertrain Control Module Connector End Views in Engine Controls - 2.2L (L61) or Computer/Integrating Systems Connector End Views in Computer/Integrating Systems | |||
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
2 |
Does the Cruise Control Switch parameter display On? | Go to Step 3 | Go to Step 5 |
3 |
Does the Cruise Control Switch parameter display Set? | Go to Step 4 | Go to Step 8 |
4 |
Does the Cruise Control Switch parameter Display Resume? | Go to Diagnostic Aids | Go to Step 8 |
Does the test lamp illuminate? | Go to Step 6 | Go to Step 10 | |
6 |
Does the Cruise Control Switch parameter display 5 volts? | Go to Step 8 | Go to Step 7 |
7 | Test the cruise control switch signal circuit for a high resistance, for an open or for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 13 | Go to Step 9 |
8 | Inspect for poor connections at the harness connector of the cruise control switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 13 | Go to Step 11 |
9 | Inspect for poor connections at the harness connector of the BCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 13 | Go to Step 12 |
10 | Repair the open, the high resistance, or the short to ground in the Ignition 1 voltage circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 13 | -- |
11 | Replace the cruise control switch. Refer to Steering Wheel Control Switch Assembly Replacement in Steering Wheel and Column. Did you complete the replacement? | Go to Step 13 | -- |
12 |
Important: Program the replacement BCM. The brake pedal position (BPP) sensor must be calibrated after replacement. Replace the BCM. Refer to Body Control Module Replacement in Computer/Integrating Systems. Did you complete the replacement? | Go to Step 13 | -- |
13 |
Does the cruise control system operate properly? | System OK | Go to Step 2 |
Cruise Control Inoperative/Malfunctioning 3.5L
Diagnostic Aids
Caution: Refer to SIR Caution in the Preface section.
Disable the inflatable restraint steering wheel module when performing this diagnostic table. Refer to SIR Disabling and Enabling in SIR.
Perform the following to avoid misdiagnosis:
| • | Ensure that the following cruise control switches are not stuck in the engaged position: |
| • | On/Off switch |
| • | Set/Coast switch |
| • | Resume/Accel switch |
| • | Inspect for proper operation of the stop lamps. Refer to Exterior Lighting Systems Description and Operation in Wiring Systems. |
| • | Rotate the steering wheel to both steering stops and activate each cruise control switch separately. With a scan tool, observe the Cruise Control Switch parameter in the body control module (BCM) Cruise Control data list. This will help eliminate the possibility of a internally open or shorted inflatable restraint steering wheel module coil. |
| • | 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 in Wiring Systems. |
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 within 9-16 volts. |
| • | The park brake is not applied. |
Test Description
The numbers below refer to the step numbers on the diagnostic table.
-
This step tests the ignition 1 voltage circuit for an open, for a short to ground, or for a high resistance.
-
DTCs will set in the powertrain control module (PCM) when you perform this diagnostic table.
Step | Action | Values | Yes | No |
|---|---|---|---|---|
Schematic Reference: Cruise Control Schematics Connector End View Reference: Powertrain Control Module Connector End Views in Engine Controls-3.5L (LX9) or Computer/Integrating Systems Connector End Views in Computer/Integrating Systems | ||||
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 3 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
2 | Is DTC P0573 current in the powertrain control module (PCM)? | -- | Go to DTC P0573 in Lighting Systems | Go to Step 3 |
3 |
Does the Cruise Control Switch parameter display On? | -- | Go to Step 4 | Go to Step 9 |
4 |
Does the Cruise Control Switch parameter display Set? | -- | Go to Step 5 | Go to Step 13 |
5 |
Does the Cruise Control Switch parameter Display Resume? | -- | Go to Step 6 | Go to Step 13 |
6 |
Does the voltage measure greater than the specified value? | 8.5 Volts | Go to Step 7 | Go to Step 12 |
7 | Test the vehicle speed signal circuit for a short to voltage. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 23 | Go to Step 8 |
8 | With a DMM, measure the voltage of the stop lamp switch signal circuit. Does the voltage measure greater than the specified value? | 8.5 Volts | Go to Step 15 | Go to Step 17 |
Does the test lamp illuminate? | -- | Go to Step 10 | Go to Step 18 | |
10 |
Does the Cruise Control Switch parameter display 5 volts? | -- | Go to Step 13 | Go to Step 11 |
11 | Test the cruise control switch signal circuit for a high resistance, for an open or for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 23 | Go to Step 14 |
12 | Test the vehicle speed signal circuit for an open or for a high resistance. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 23 | Go to Step 22 | |
13 | Inspect for poor connections at the harness connector of the cruise control switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 23 | Go to Step 19 |
14 | Inspect for poor connections at the harness connector of the BCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 23 | Go to Step 20 |
15 | Inspect for poor connections at the harness connector of the TAC module. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 23 | Go to Step 21 |
16 | Inspect for poor connections at the harness connector of the PCM. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 23 | Go to Step 22 |
17 | Repair the open or the high resistance in the stop lamp switch signal circuit between the underhood fuse block and the TAC module. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 23 | -- |
18 | Repair the open, the high resistance, or the short to ground in the Ignition 1 voltage circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 23 | -- |
19 | Replace the cruise control switch. Refer to Steering Wheel Control Switch Assembly Replacement in Steering Wheel and Column. Did you complete the replacement? | -- | Go to Step 23 | -- |
20 |
Important: Program the replacement BCM. The brake pedal position (BPP) sensor must be calibrated after replacement. Replace the BCM. Refer to Body Control Module Replacement in Computer/Integrating Systems Did you complete the replacement? | -- | Go to Step 23 | -- |
21 | Replace the TAC module. Refer to Throttle Body Assembly Replacement in Engine Controls - 3.5L (LX9). Did you complete the replacement? | -- | Go to Step 23 | -- |
|
Important: Program the replacement powertrain control module (PCM). Replace the PCM. Refer to Powertrain Control Module Replacement in Engine Controls - 3.5L (LX9). Did you complete the replacement? | -- | Go to Step 23 | -- | |
23 |
Does the cruise control system operate properly? | -- | System OK | Go to Step 2 |
