Toyota RAV4 manuals

Toyota Sienna Service Manual: Engine Control System Malfunction

DTC C1201/51 Engine Control System Malfunction

DESCRIPTION

If trouble occurs the engine control system, the ECM transmits the abnormality to the skid control ECU.

The skid control ECU set this DTC and the skid control ECU prohibits TRAC and VSC control.

INSPECTION PROCEDURE

1 CHECK ENGINE CONTROL SYSTEM

(a) Check if the normal system code is recorded for engine control system.

Result

REPLACE ECM

Open or Short Circuit in ABS Solenoid Relay Circuit
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ECM Communication Circuit Malfunction
DTC C1203/53 ECM Communication Circuit Malfunction DESCRIPTION The circuit is used to send TRAC and VSC control information from the skid control ECU to the ECM, and engine control information fr ...

Other materials:

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How to proceed with troubleshooting
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Purpose of readiness tests
The On-Board Diagnostic (OBD II) system is designed to monitor the performance of emissionrelated components, and indicate any detected abnormalities with DTCs (Diagnostic Trouble Codes). Since various components need to be monitored in different driving conditions, the OBD II system ...

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