Up to 08/2009

BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM: C1438/59: Lost Communication with HV ECU
C1438/59 - Lost Communication with HV ECU

DESCRIPTION

The skid control ECU receives signals from the power management control ECU via the CAN communication system.





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK HARNESS AND CONNECTOR (MOMENTARY INTERRUPTION)

(a) Using the Techstream, check for any momentary interruption in the wire harness and connector corresponding to the DTC Check For Intermittent Problems.

ABS/VSC/TRAC





OK:

There are no momentary interruptions.

HINT
Perform the above inspection before removing the sensor and connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (SKID CONTROL ECU - POWER MANAGEMENT CONTROL ECU)
OK -- Continue to next step.

2. RECONFIRM DTC

(a) Turn the power switch off.

(b) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.

(c) Turn the power switch on (READY).

(d) Drive the vehicle at a speed of 15 km/h (9 mph) or more for 10 seconds or more.

(e) Check that no CAN communication system DTC is output Diagnosis System.

(f) Check if the same DTC is recorded Reading and Clearing Diagnostic Trouble Codes.

Result:





C -- INSPECT CAN COMMUNICATION SYSTEM How to Proceed With Troubleshooting

B -- REPLACE SKID CONTROL ECU Removal

A -- CHECK FOR INTERMITTENT PROBLEMS How To Proceed With Troubleshooting

3. REPAIR OR REPLACE HARNESS OR CONNECTOR (SKID CONTROL ECU - POWER MANAGEMENT CONTROL ECU)

(a) Turn the power switch off.

(b) Repair or replace the harness or connector.

(c) Check for any momentary interruption between the skid control ECU and the power management control ECU Check For Intermittent Problems.

(d) Check that there is no momentary interruption.

NEXT -- Continue to next step.

4. RECONFIRM DTC

(a) Turn the power switch off.

(b) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.

(c) Turn the power switch on (READY).

(d) Drive the vehicle at a speed of 15 km/h (9 mph) or more for 10 seconds or more.

(e) Check that no CAN communication system DTC is output Diagnosis System.

(f) Check if the same DTC is recorded Reading and Clearing Diagnostic Trouble Codes.

Result:





C -- INSPECT CAN COMMUNICATION SYSTEM How to Proceed With Troubleshooting

B -- REPLACE SKID CONTROL ECU Removal

A -- END