Circuit Description
The Cruise Control Brake switch and the cruise clutch switch are normally closed switches. When the Cruise Brake switch or the cruise clutch switch are closed, the PCM senses ignition voltage on the Cruise Control release signal circuit. The PCM compares this signal to the signal received from the other clutch and brake switches. If these switches do not agree this DTC will set.
Conditions for Running the DTC
| • | The engine speed is greater than 700 RPM. |
| • | The engine operates for greater than 2 seconds. |
| • | The wheel speed is greater than 30 mph in order to enable the diagnostic. The diagnostic disables when the wheel speed is below 10 mph. |
Conditions for Setting the DTC
| • | The PCM senses this switch is not toggling as compared with other brake switch inputs. |
| • | The condition is present for 20 accel/decel cycles. |
Action Taken When the DTC Sets
| • | The PCM will not illuminate the malfunction indicator lamp (MIL). |
| • | The PCM will store conditions which were present when the DTC set as Failure Records data only. This information will not be stored as Freeze Frame data. |
Conditions for Clearing the MIL/DTC
| • | A History DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction. |
| • | The DTC can be cleared by using the scan tool Clear Info function. |
Diagnostic Aids
Important: Remove any debris from the connector surfaces before servicing a component. Inspect the connector gaskets when diagnosing/replacing a component. Ensure that the gaskets are installed correctly. The gaskets prevent contaminate intrusion.
Perform the following in order to adjust the Cruise Control Brake switch:
- With the brake pedal depressed, insert the Cruise Control Brake switch into the retainer until the switch body seats in the retainer. You can hear clicks as you push the threaded portion of the switch through the retainer.
- Slowly pull the brake pedal fully rearward against the stop until you can no longer hear the clicks.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
-
This step determines if the fault is present.
-
This step tests for a Cruise Control Release circuit for a short to B+.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Did you perform the Powertrain On-Board Diagnostic (OBD) System Check? | -- | ||
Does the scan tool parameter switch from Released to Applied? | -- | Go to Diagnostic Aids | ||
3 | Inspect the A/C Cruise fuse. Is the fuse open? | -- | ||
|
Important:: Only do this step if the vehicle has a manual transmission. Otherwise go to step 5.
Does the test lamp illuminate? | -- | |||
5 |
Does the test lamp illuminate when probing either circuit? | -- | ||
6 | Test the adjustment of the cruise control brake switch. Go to Diagnostic Aids. Did you find a correct the condition? | -- | ||
7 |
Important: Only do this step if the vehicle has a manual transmission. Otherwise go to step 12. Test the adjustment of the cruise clutch switch. Go to Diagnostic Aids. Did you find and correct the condition? | -- | ||
8 |
Does the voltage measure at or near the specified value? | B+ | ||
9 | Probe the brake switch feed circuit at the clutch switch connector using a DMM that is connected to a good ground. Does the voltage measure at or near the specified value? | 0V | ||
10 |
Does the DMM toggle from open to continuity. | -- | ||
11 |
Does the DMM indicate continuity? | -- | ||
12 |
Does the voltage measure at or near the specified value? | B+ | ||
13 | Probe the cruise control release switch signal circuit at the brake switch connector using a DMM that is connected to a good ground. Does the voltage measure at or near the specified value? | 0V | ||
14 |
Does the DMM toggle from open to continuity. | -- | ||
15 | Test for an open in the cruise control release switch signal circuit. Refer to Wiring Repairs . Did you find and correct the condition? | -- | ||
16 | Test for poor connections. Refer to Intermittents and Poor Connections Diagnosis and Connector Repairs . Did you find and correct the condition? | -- | ||
17 | Repair the short to ground in the clutch switch feed circuit. Refer to Wiring Repairs . Did you complete the repair? | -- | -- | |
18 | Repair the open in the clutch switch feed circuit. Refer to Wiring Repairs . Did you complete the repair? | -- | -- | |
19 | Repair the short to voltage between the clutch switch and the PCM. Refer to Wiring Repairs . Did you complete the repair? | -- | -- | |
20 | Replace the cruise clutch switch. Did you complete the replacement? | -- | -- | |
21 | Repair the open in the brake switch feed circuit between the clutch and brake switch. Refer to Wiring Repairs . Did you complete the repair? | -- | -- | |
22 | Repair the open in the brake switch feed circuit. Refer to Wiring Repairs . Did you complete the repair? | -- | -- | |
23 | Repair the short to voltage in the brake switch signal circuit. Refer to Wiring Repairs . Did you complete the repair? | -- | -- | |
24 | Replace the cruise brake switch. Did you complete the replacement? | -- | -- | |
25 |
Important:: Program the replacement PCM. Refer to Powertrain Control Module Replacement/Programming . Replace the PCM. Did you complete the replacement? | -- | -- | |
26 | Repair the short to ground on the circuit which illuminated the test lamp. Refer to Wiring Repairs . Did you complete the repair? | -- | ||
27 |
Does the DTC reset? | -- | ||
28 | Does the scan tool indicated any DTCs set that you have not diagnosed? | -- | Go to applicable DTC table | System OK |
