P1573

Code 1573, Traction Control System Fault (Loss Of ABS/TCS Serial Data):

Traction Control Torque Circuit:

CIRCUIT DESCRIPTION
The PCM uses the serial data line (CKT 800) to communicate with various other components and systems within the vehicle. If the PCM does not receive data from the Electronic Brake and Traction Control Module (EBTCM), the PCM will store DTC P1573 indicating loss of communication with the ABS/TCS system.

DTC 1573 WILL SET WHEN:
^ DTC P1630 not set.
^ PCM has detected communication error for .5 second.

ACTION TAKEN (PCM will default to):
With a current DTC P1573 stored, the PCM will not be able to communicate with the EBTCM. This will cause the EBTCM to set ABS DTC 76, disable traction control, and illuminate the "TRACTION OFF" lamp. DTC P1573 does not illuminate the MIL (Service Engine Soon).

TEST DESCRIPTION
Number(s) below refer to circled number(s) on the diagnostic chart.
1. Checks to see if the EBTCM is able to transmit data and ensures that CKT 800 to the EBTCM is not open.

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 vehicle wiring harness, for an open or short to ground in CKT 800, improper mating, broken locks, improperly formed or damaged terminals, poor terminal to wire connection, and damaged harness.
^ Intermittent test - Observe ABS data on the Tech 1 while moving harness and related connectors. If failure is induced, Tech 1 data will stop updating. This may help to isolate the location of the malfunction.