Engine Control System Malfunction - Electronically Controlled Brake System

BRAKE CONTROL: ELECTRONICALLY CONTROLLED BRAKE SYSTEM: C1201/51: Engine Control System Malfunction
C1201/51 - Engine Control System Malfunction

DESCRIPTION

If a malfunction in the engine control system is detected, the operations of VSC and TRAC are prohibited by the fail-safe function. When the signals from the engine are input normally, the fail-safe is canceled and the DTC is not stored.





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 a 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 (ECM TO SKID CONTROL ECU)
OK -- Continue to next step.

2. CHECK DTC FOR ENGINE CONTROL SYSTEM

(a) Clear the DTC Reading and Clearing Diagnostic Trouble Codes.

(b) Check for the DTC Reading and Clearing Diagnostic Trouble Codes.

Result:





B -- REPAIR ENGINE CONTROL SYSTEM ACCORDING TO DTC OUTPUT SFI System

A -- REPLACE ECM

3. REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM TO SKID CONTROL ECU)

NEXT -- Continue to next step.

4. RECONFIRM DTC

(a) Clear the DTC Electronically Controlled Brake System.

(b) Perform a road test.

(c) Check if the same DTC is recorded Electronically Controlled Brake System.

Result:





B -- CHECK DTC FOR ENGINE CONTROL SYSTEM

A -- END