Powertrain Controls - ECM/PCM

DTC 41 Brake Switch Circuit Fault:

Brake Switch Circuit Fault:

CIRCUIT DESCRIPTION
The Torque Converter Clutch (TCC) normally closed brake switch supplies a B+ signal on CKT 420 to the Powertrain Control Module (PCM). The signal voltage is opened when the brakes are applied.
The stop lamp/cruise control normally open brake switch supplies a B+ signal on CKT 820 to the PCM when the brake is applied.

DIAGNOSTIC TROUBLE CODE (DTC) 41 WILL SET WHEN
^ Switches disagree for 10 consecutive minutes.
OR
^ TCC and cruise control brake switches not toggling "open" and "closed," during 6 brake applications on same ignition cycle.

ACTION TAKEN (PCM will default to)
An incorrect brake signal can affect TCC, fourth gear operation, in hot mode and cruise control.

DTC 41 WILL CLEAR WHEN
The fault condition(s) no longer exist.

DTC CHART TEST DESCRIPTION
Number(s) below refer to circled number(s) on the diagnostic chart.
1. This test checks for voltage at brake switch.
2. This test simulates brake switch closed or brakes "OFF."
3. This test checks for ignition feed to TCC brake switch.
4. This test checks CKT 420 and simulates brakes being applied.

DIAGNOSTIC AIDS
^ Refer to PCM Intermittent Diagnostic Trouble Codes or Performance. PCM/TCM Intermittent Diagnostic Trouble Code or Performance
^ Check customer driving habits and/or unusual traffic conditions (i.e. stop and go expressway turnoff).