Refer to Engine Controls Schematics
Power, Ground, MIL, and DLC
.
Circuit Description
The PCM uses the serial data line to communicate with various other components and systems within the vehicle. If the PCM does not receive data from the Electronic Brake Control Module/Electronic Brake and Traction Control Module (EBCM/EBTCM), the PCM will store DTC P1573 indicating loss of communications with the ABS or ABS/TCS system.
Conditions for Running the DTC
The ignition switch is ON.
Conditions for Setting the DTC
The PCM has detected a PCM - EBCM/EBTCM communication error for 0.5 second.
Action Taken When the DTC Sets
The PCM stores conditions which were present when the DTC set as Failure Records only. This information will not be stored as Freeze Frame Records.
Conditions for Clearing the MIL/DTC
| • | The DTC becomes history when the conditions for setting the DTC are no longer present. |
| • | The history DTC clears after 40 malfunction free warm-up cycles. |
| • | The PCM receives a clear code command from the scan tool. |
Diagnostic Aids
Inspect for the following conditions:
Many situations may lead to an intermittent condition. Perform each inspection or test as directed.
Important: : Remove any debris from the connector surfaces before servicing a component. Inspect the connector gaskets when diagnosing or replacing a component. Ensure that the gaskets are installed correctly. The gaskets prevent contaminate intrusion.
| • | Loose terminal connection |
| - | Use a corresponding mating terminal to test for proper tension. Refer to Testing for Intermittent Conditions and Poor Connections , and to Connector Repairs in Wiring Systems for diagnosis and repair. |
| - | Inspect the harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, and faulty terminal to wire connection. Refer to Testing for Intermittent Conditions and Poor Connections , and to Connector Repairs in Wiring Systems for diagnosis and repair. |
| • | Damaged harness--Inspect the wiring harness for damage. If the harness inspection does not reveal a problem, observe the display on the scan tool while moving connectors and wiring harnesses related to the sensor. A change in the scan tool display may indicate the location of the fault. Refer to Wiring Repairs in Wiring Systems for diagnosis and repair. |
| • | Inspect the powertrain control module (PCM) and the engine grounds for clean and secure connections. Refer to Wiring Repairs in Wiring Systems for diagnosis and repair. |
If the condition is determined to be intermittent, reviewing the Snapshot or Freeze Frame/Failure Records may be useful in determining when the DTC or condition was identified.
Test Description
The number below refers to the step number on the diagnostic table.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Did you perform the Powertrain On-Board Diagnostic (OBD) System Check? | -- | ||
Attempt to select ABS data with the scan tool. Can ABS data be displayed? | -- | |||
3 |
Did you find and correct the condition? | -- | ||
4 |
Does voltage constantly vary between the specified values? | 0.0-5.0V | ||
5 | Test the serial data circuit for a faulty connection at the PCM. Refer to Testing for Intermittent Conditions and Poor Connections and Repairing Connector Terminals in Wiring Systems. Did you find and correct the condition? | -- | Go to Diagnostic Aids | |
6 | Test the serial data circuit for a faulty connection at the EBTCM. Refer to Testing for Intermittent Conditions and Poor Connections . Refer to a Connector Repairs or Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | ||
7 | Replace the EBTCM. Refer to Electronic Brake Control Module Replacement in Antilock Brake System. Did you complete the replacement? | -- | -- | |
8 |
Does the scan tool indicate DTC P1573 failed? | -- | System OK |
