Refer to Engine Controls Schematic
Cell 23: A/T Controls 1 -- Stoplamp/TCC Switch, Internal Solenoids
.
Circuit Description
The TCC normally closed brake switch supplies a B+ signal on to the PCM. The circuit is opened when the brakes are applied. The stop lamp/cruise control normally open brake switch supplies a B+ signal on to the PCM when the brake is applied.
Conditions for Running the DTC
The vehicle mph is more than 0.
Conditions for Setting the DTC
The switches disagree for 10 consecutive minutes.
or
The TCC and the cruise control brake switches are not toggling open and closed, during six brake applications on the same ignition cycle.
Action Taken When the DTC Sets
| • | 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 will clear after forty consecutive warm-up cycles during which the diagnostic does not fail (the coolant temperature has risen 5°C (40°F) from the start up coolant temperature and the engine coolant temperature exceeds 71°C (160°F) during that same ignition cycle. |
| • | Use of a Scan tool will clear the DTC codes. |
Diagnostic Aids
Refer to PCM Intermittent Diagnostic Trouble Codes or Performance. Check the driving habits of the customer and/or unusual traffic conditions (i.e. stop and go, expressway traffic).
Test Description
Number(s) below refer to the step number(s) on the Diagnostic Table.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 |
Important: Before clearing the DTCs, use the scan tool Capture Information function to save the Freeze Frame and the Failure records for reference. The control module's data is deleted once the Clear DTC Information function is used. Was the Powertrain On-Board Diagnostic (OBD) System Check performed? | -- | ||
2 |
Does the scan tool display the cruise brake switch Closed and then Open when the brake is applied? | -- | ||
3 | Apply the brakes again. Does the scan tool display the brake switch Open and then Closed when the brake is applied? | -- | ||
Is the test lamp ON? | -- | |||
5 |
Is the test lamp ON? | -- | ||
Does the scan tool display the brake switch Closed? | -- | |||
7 |
Is the test lamp ON? | -- | ||
8 |
Does the scan tool display the cruise brake switch Closed? | -- | ||
9 | The DTC is intermittent. If no additional DTCs are stored, refer to Diagnostic Aids. If additional DTCs were stored refer to the applicable DTC table(s) first. Are any additional DTCs stored? | -- | Go to the Applicable DTC Table | Go to Diagnostic Aids |
10 | Check the normally open feed circuit (terminal B) for and open or short to ground. Refer to Wiring Repairs. Is the action complete? | -- | -- | |
11 |
Is the action complete? | -- | ||
12 | Check the normally open brake switch signal circuit for and open or short to ground. Repair the circuit as necessary. Refer to Wiring Repairs. Did you perform a repair? | -- | ||
13 | Check the normally open brake switch signal circuit for a proper connection at PCM? Refer to Wiring Repairs. Did you perform a repair? | -- | ||
14 | Check the normally closed feed circuit (terminal F) for and open or short to ground. Refer to Wiring Repairs. Is the action complete? | -- | -- | |
15 | Check the normally closed cruise brake switch signal circuit for an open or short to ground. Refer to Wiring Repairs. Did you perform a repair? | -- | ||
16 | Check the normally closed cruise brake switch signal circuit for a proper connection at PCM? Refer to Wiring Repairs. Did you perform a repair? | -- | ||
17 | Replace the stoplamp switch. Is the action complete? | -- | -- | |
18 |
Important: The new PCM must be programmed. Refer to Powertrain Control Module Replacement/Programming . Replace the PCM. Is the action complete? | -- | -- | |
19 |
Does the scan tool indicate the diagnostic Passed? | -- | ||
20 | Does the scan tool display any additional undiagnosed DTCs? | -- | Go to the Applicable DTC Table | System OK |
