Diagnostic Aids
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 Pedal Cruise Control Release Switch Adjustment . |
| • | Inspect for proper operation of the clutch pedal. |
| • | For an intermittent condition, refer to Testing for Intermittent Conditions and Poor Connections . |
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 | |||||||||
2 |
Do all of the parameters listed above display Off? | -- | Go to Step 3 | Go to Step 13 | ||||||||
3 |
Does the Cruise On/Off Switch parameter display On? | -- | Go to Step 4 | Go to Step 11 | ||||||||
4 |
Does the Cruise Set/Coast Switch parameter display On? | -- | Go to Step 5 | Go to Step 12 | ||||||||
5 |
Does the Cruise Resume/Accel Switch parameter display On? | -- | Go to Step 6 | Go to Step 12 | ||||||||
6 | Do the stop lamps operate properly? | -- | Go to Step 7 | Go to Stop Lamps Inoperative or Go to Stop Lamps Always On | ||||||||
7 | Test the stop lamp supply voltage circuit for an open or for a high resistance. Refer to Circuit Testing and to Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 25 | Go to Step 8 | ||||||||
8 | Is the vehicle equipped with a manual transmission? | -- | Go to Step 9 | Go to Step 20 | ||||||||
9 |
Does the resistance measure between the specified values? | 10-15 Ω | Go to Step 10 | Go to Step 18 | ||||||||
10 |
Does the resistance measure at the specified value? | O.L. | Go to Step 14 | Go to Step 18 | ||||||||
11 | Connect a DMM between the ignition 1 voltage circuit at the back of C200 and a good ground. Does the voltage measure at the specified value? | B+ | Go to Step 12 | Go to Step 21 | ||||||||
12 |
Important: The cruise control On/Off switch must be turned ON in order to correctly view the set/coast resistance value with the DMM.
Do the cruise control function switch resistance values measure between the specified values? | 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 17 | Go to Step 19 | ||||||||
13 |
Important: The cruise control On/Off switch must be turned ON in order to correctly view the set coast resistance value with the DMM.
Do the resistance values measure at the specified values? | 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 19 | ||||||||
14 |
Does the test lamp illuminate? | -- | Go to Step 15 | Go to Step 21 | ||||||||
15 | 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 25 | Go to Step 20 | ||||||||
16 | 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 25 | Go to Step 20 | ||||||||
17 | 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 25 | Go to Step 20 | ||||||||
18 | 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 25 | Go to Step 22 | ||||||||
19 | 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 25 | Go to Step 23 | ||||||||
20 | 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 25 | Go to Step 24 | ||||||||
21 | Repair the following in the ignition 1 voltage circuit:
Refer to Wiring Repairs . Did you complete the repair? | -- | Go to Step 25 | -- | ||||||||
22 | Replace the clutch release switch. Refer to Clutch Pedal Cruise Control Release Switch Replacement . Did you complete the replacement? | -- | 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 PCM. 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 | ||||||||
