P1571

DTC P1571 Traction Control Desired Torque Out Of Range:

Cruise Control Servo Wiring Circuit:

Circuit Description:
The traction control system uses the antilock brake system in conjunction with the PCM fuel and ignition controls to limit drive wheel slippage during acceleration. The PCM controlled portion of the traction control system reduces engine torque by any or all of the following methods:
^ Retarding spark timing.
^ Altering air/fuel ratio.
^ Shutting "OFF" up to three injectors.

To determine the amount of torque reduction required, the PCM monitors the desired torque PWM signal (CKT 463) from the Electronic Brake and Traction Control Module (EBTCM). The PCM also provides a delivered torque PWM signal (CKT 464) informing the Electronic Brake and Traction Control Module (EBTCM) how much torque is being produced by the engine.

DTC P1571 Will Set When: If the desired torque signal PWM duty cycle is below 5% or above 95%, DTC P1571 will set indicating a problem with the desired torque input on CKT 463.

Action Taken (PCM will default to): With a current DTC P1571 set, the PCM will command the EBTCM via serial data (CKT 800) to set ABS/TCS DTC 124, turn "OFF" traction control, and illuminate the "TCS" or "SERVICE TRAC CTL" lamp. DTC P1571 does not illuminate the MIL (Service Engine Soon).

DTC Chart Test Description: Number(s) below refer to circled number(s) on the diagnostic chart.
1. Checks CKT 463 for an open or short to ground.
2. Ensures that the EBTCM is providing a proper PWM signal to the PCM on CKT 463.

Diagnostic Aids: An intermittent may be caused by a poor connection, rubbed through wire insulation or a wire broken inside the insulation.

Check for:
^ Poor connection or damaged harness - Inspect PCM harness for an open or short to ground in CKT 463 improper mating, broken locks, improperly formed or damaged terminals, poor terminal to wire connection, and damaged harness.
^ Intermittent test - Using a DVOM to ground, observe voltage at PCM terminal "WC13" while moving related connectors and wiring harness with warm engine running. If the failure is induced, the voltage will change. This may help to isolate the location of the malfunction.