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Diagnosis - Diagnosis-fault diagnosis of electronic and electrical parts DI - 77
The diagnosis instrument cannot communicate with ECM IN
Failure phenomenon list
Failure phenomenon Possible reason Failure elimination DI
● Check and repair its power supply
1. ECM power supply fault EG
circuit
The diagnostic unit can’t
2. Fault of harness between ECM and ● Check, repair or replace relevant
communicate with ECM. TR
diagnostic unit harness
3. ECM failure ● Replace ECM
AX
Circuit diagram
FR
Engine ECM
ST
BR
BW
Green Yellow
Green
Yellow EL
Yellow Green
Terminal resistance
Diagnosis system
DI-077
