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 in order to avoid misdiagnosis:
- Inspect for proper operation of the stop lamps. Refer to Exterior Lighting Systems Description and Operation in Lighting Systems.
- Inspect for proper operation of the clutch system, if equipped with manual transmission. Refer to Clutch System Description and Operation in Clutch.
- Observe the cruise set/coast and cruise resume/accel parameters in the scan tool PCM General Info Inputs data list while rotating the steering wheel to both stops and pressing and holding the steering wheel control switches. This will eliminate the possibility of a internally open or shorted inflatable restraint steering wheel module coil.
- Rotate the steering wheel to both steering stops while separately activating each cruise control switch. With a scan tool, observe the associated cruise control switch parameter in the PCM General Info Inputs data list. This will help eliminate the possibility of a internally open or shorted inflatable restraint steering wheel module coil.
EMI on the vehicle 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 between 12-16 volts. |
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Cruise Control Schematics Connector End View Reference: Cruise Control Connector End Views , Engine Control Module Connector End Views in Engine Controls - 2.2L (L61) or to Powertrain Control Module Connector End Views in Engine Controls - 3.5L (L66) | |||
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 Switch parameter display Off? | Go to Step 3 | Go to Step 11 |
3 |
Does the Cruise Switch parameter display On? | Go to Step 4 | Go to Step 12 |
4 |
Does the Cruise Set/Coast parameter display On? | Go to Step 5 | Go to Step 14 |
5 |
Does the Cruise Resume/Accel parameter display On? | Go to Step 6 | Go to Step 15 |
6 | With a scan tool, observe the Cruise Brake Switch parameter Does the Cruise Brake Switch parameter display Released? | Go to Step 7 | Go to Step 9 |
7 |
Does the Cruise Brake Switch parameter display Applied? | Go to Diagnostic Aids | Go to Step 8 |
8 |
Does the Cruise Brake Switch parameter display Applied? | Go to Step 23 | Go to Step 18 |
9 |
Does the test lamp illuminate? | Go to Step 10 | Go to Step 22 |
10 |
Does the Cruise Brake Switch parameter display Released? | Go to Step 23 | Go to Step 19 |
11 |
Does the Cruise Switch parameter display Off? | Go to Step 20 | Go to Step 16 |
12 |
Does the test lamp illuminate? | Go to Step 13 | Go to Step 22 |
13 |
Does the Cruise Switch parameter display On? | Go to Step 20 | Go to Step 17 |
14 | Test the cruise control set/coast switch signal circuit for a short to ground, 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 26 | Go to Step 20 |
15 | Test the cruise control resume/accel switch signal circuit for a short to ground, 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 26 | Go to Step 20 |
16 | Test the cruise control on switch 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 26 | Go to Step 21 |
17 | Test the cruise control on switch signal circuit for an open, for a short to ground, 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 26 | Go to Step 21 |
18 | Test the cruise brake switch 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 26 | Go to Step 21 |
19 | Test the cruise brake switch signal circuit for an open, for a short to ground, 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 26 | Go to Step 21 |
20 | Inspect for poor connections at the harness connector of the cruise control switch. 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 26 | Go to Step 24 |
21 | Inspect for poor connections at the harness connector of the engine control module (ECM)/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 26 | Go to Step 25 |
22 | Repair the short to ground, the open, or the high resistance in the ignition 1 voltage circuit. Refer to Wiring Repairs Wiring Systems. Did you complete the repair? | Go to Step 26 | -- |
23 | Replace the cruise brake switch. Refer to Cruise Control Release Switch Replacement . Did you complete the replacement? | Go to Step 26 | -- |
24 | 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 26 | -- |
25 | Replace the ECM/PCM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement? | Go to Step 26 | -- |
26 |
Does the cruise control system operate properly? | System OK | Go to Step 2 |
