Circuit Description
The normally closed TCC/cruise brake switch supplies a B+ signal on the TCC/brake switch signal circuit to the PCM. The circuit is opened when the brakes are applied. The normally open stop lamp switch supplies a B+ signal on the stoplamp switch signal circuit to the PCM when the brake is applied.
Conditions for Running the DTC
| • | The stop lamp and TCC/cruise brake switch signal voltages are not what is anticipated by the PCM for 10 consecutive minutes. |
| or |
| • | The TCC/ cruise and stop lamp brake switches are not toggling open and closed, during 6 brake applications on the same ignition cycle. |
Conditions for Setting the DTC
| • | The stop lamp and TCC/cruise brake switch signal voltages are not what is expected by the PCM for 10 consecutive minutes. |
| or |
| • | The TCC/ cruise and stop lamp brake switches are not toggling open and closed, during 6 brake applications on the same ignition cycle. |
Action Taken When the DTC Sets
| • | The PCM disallows all cruise control inputs. |
| • | TCC shift schedules may be affected. |
| • | The PCM will not illuminate the Malfunction Indicator Lamp (MIL). |
| • | The PCM records the operating conditions at the time the diagnostic fails. This information stores in the Failure Records. |
Conditions for Clearing the MIL/DTC
| • | A History DTC clears after forty consecutive warm-up cycles, if this or any other emission related diagnostic does not report any failures. |
| • | The use of a scan tool. |
Diagnostic Aids
Check customer driving habits and/or unusual traffic conditions, i.e. stop and go, expressway traffic.
Step | Action | Yes | No |
|---|---|---|---|
1 | Did you perform A Diagnostic System Check - Cruise Control? | Go to Step 2 | |
2 |
Did the scan tool parameters change state? | Go to Diagnostic Aids | Go to Step 3 |
3 | Is the vehicle equipped with a manual transmission? | Go to Step 4 | Go to Step 6 |
4 | Press the clutch pedal. Did the TCC/cruise brake switch parameter change state? | Go to Step 8 | Go to Step 5 |
5 | Test the clutch pedal position (CPP) switch ignition positive voltage circuit for a open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 10 | Go to Step 7 |
6 | Test the appropriate signal circuit for a open or a high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 10 | Go to Step 7 |
7 | Test the stop lamp switch positive voltage circuits for a open, high resistance or short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 10 | Go to Step 8 |
8 | Inspect for poor connections at the appropriate switch. Refer to Testing for Intermittent Conditions and Poor Connections or Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 10 | Go to Step 9 |
9 | Replace the appropriate switch. Did you complete the replacement? | Go to Step 10 | -- |
10 | Operate the vehicle with in the conditions for cruise control operation. Does the cruise control operate properly? | System OK | Go to Step 2 |
