Diagnostic Aids
WARNING: This page is about a different car, the 2005 GMC Canyon and 2005 Chevrolet Colorado. However, it is still accessible from the selected car via links, so may be relevant.
Perform the following in order to avoid a 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 .
- Inspect for proper adjustment of the TCC brake/cruise release switch. Refer to Cruise Release Switch Adjustment .
- Inspect for proper adjustment of the clutch release switch. Refer to Clutch Release Switch Adjustment .
- Inspect for proper operation of the clutch pedal.
- For an intermittent condition, refer to Testing for Intermittent Conditions and Poor Connections .
Cruise Control Inoperative/Malfunctioning
| Step | Action | Values | Yes | No |
|---|---|---|---|---|
| Schematic Reference: Cruise Control Schematics Connector End View Reference: Master Electrical Component List |
||||
| 1 | Did you perform the Diagnostic System Check - Vehicle? | - | Go to Step 2 | Go to Diagnostic System Check - Vehicle |
| 2 |
|
- | Go to Step 3 | Go to Step 11 |
| 3 |
|
- | Go to Step 4 | Go to Step 9 |
| 4 |
|
- | Go to Step 5 | Go to Step 10 |
| 5 |
|
- | Go to Step 6 | Go to Step 10 |
| 6 | Is the vehicle equipped with a manual transmission? | - | Go to Step 7 | Go to Diagnostic Aids |
| 7 |
|
10-15 Ω | Go to Step 8 | Go to Step 17 |
| 8 |
|
O.L. | Go to Step 17 | Go to Step 12 |
| 9 | Connect a DMM between the ignition 1 voltage circuit at the back of C204 and a good ground. Does the voltage measure at the specified value? |
B+ | Go to Step 10 | Go to Step 20 |
| 10 |
IMPORTANT:
The cruise control On/Off switch must be turned ON in order to correctly view the set/coast resistance value with the DMM.
|
Off = O.L. On = 7.8 K Ω - 8.6 K Ω Resume = 2.7 K Ω - 3.0 K Ω Set = 1.2 K Ω - 1.3 K Ω |
Go to Step 16 | Go to Step 18 |
| 11 |
IMPORTANT:
The cruise control On/Off switch must be turned ON in order to correctly view the set coast resistance value with the DMM.
|
Off = O.L. On = 7.8 K Ω - 8.6 K Ω Resume = 2.7 K Ω - 3.0 K Ω Set = 1.2 K Ω - 1.3 K Ω |
Go to Step 15 | Go to Step 18 |
| 12 |
|
- | Go to Step 13 | Go to Step 20 |
| 13 | Test the clutch 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 24 | Go to Step 14 |
| 14 | Test the clutch switch signal circuit for the following:
Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? |
- | Go to Step 24 | Go to Step 19 |
| 15 | Test the cruise control set/coast and resume/accelerate 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 24 | Go to Step 19 |
| 16 | Test the cruise control set/coast and 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 24 | Go to Step 19 |
| 17 | Inspect for poor connections at the harness connector of the clutch switch. Refer to Testing for Intermittent Conditions and Poor Connections
and Connector Repairs
. Did you find and correct the condition? |
- | Go to Step 24 | Go to Step 21 |
| 18 | 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
. Did you find and correct the condition? |
- | Go to Step 24 | Go to Step 22 |
| 19 | Inspect for poor connections at the harness connector of the powertrain control module (PCM). Refer to Testing for Intermittent Conditions and Poor Connections
and Connector Repairs
. Did you find and correct the condition? |
- | Go to Step 24 | Go to Step 23 |
| 20 | Repair the following in the ignition 1 voltage circuit:
Refer to Wiring Repairs . Did you complete the repair? |
- | Go to Step 24 | - |
| 21 | Replace the clutch release switch. Refer to Clutch Release Switch Replacement . Did you complete the replacement? |
- | Go to Step 24 | - |
| 22 | Replace the cruise control switch. Refer to Multifunction, Turn Signal Switch Replacement
. Did you complete the replacement? |
- | Go to Step 24 | - |
| 23 | Replace the PCM. Refer to Control Module References
for replacement, setup, and programming. Did you complete the replacement? |
- | Go to Step 24 | - |
| 24 | Operate the vehicle within the conditions for cruise control operation. Does the cruise control system operate properly? |
- | System OK | Go to Step 2 |