C1270

BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: C1203/59: ECM Communication Circuit Malfunction

DTC C1203/59 - ECM Communication Circuit Malfunction

DTC C1270/88 - Initialization Incomplete (Test Mode DTC)

DESCRIPTION

The circuit is used to send TRAC and VSC control information from the skid control ECU to the ECM, and engine control information from the ECM to the skid control ECU.
If the skid control ECU is replaced or if the memory is cleared, system information such as the destination or vehicle type will be unconfirmed. After switching to Test Mode, the skid control ECU performs initialization when starting communication with the vehicle, and stores the system information in 2 or 3 seconds.
DTC C1270/88 will be cleared when the initialization is completed normally or when Test Mode ends. DTC C1270/88 is output only in Test Mode.






INSPECTION PROCEDURE
NOTE:
When replacing the skid control ECU, perform zero point calibration and store system information Testing and Inspection.

PROCEDURE

1. CHECK PART NUMBER (ECM)
(a) Check that the part number of the installed ECM is correct.
OK:
ECM installed in the vehicle has the correct part number.
NG -- REPLACE ECM (for 2UR-GSE)
OK -- Continue to next step.

2. CLEAR AND STORE SYSTEM INFORMATION
(a) Clear the system information Testing and Inspection.
(b) Store the system information Testing and Inspection.
NEXT -- Continue to next step.

3. RECONFIRM DTC
(a) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.
(b) Check if the same DTC is recorded Reading and Clearing Diagnostic Trouble Codes.
Result:






B -- REPLACE SKID CONTROL ECU
A -- CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION)