B278A

ENGINE IMMOBILISER: ENGINE IMMOBILISER SYSTEM: B278A: Short to GND in Immobiliser System Power Source Circuit
B278A - Short to GND in Immobiliser System Power Source Circuit

DESCRIPTION

This DTC is output when the engine switch power source supply line is open or short.





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK WIRE HARNESS (CERTIFICATION ECU - ENGINE SWITCH)





(a) Disconnect the U28 and K29 switch connectors.

(b) Measure the resistance of the wire harness side connectors.

Standard resistance:





NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- Continue to next step.

2. CHECK OPERATION OF ENGINE SWITCH

(a) After replacing the engine switch with a normal one, check that the engine starts Reading and Clearing Diagnostic Trouble Codes.

OK:

Engine starts.

NG -- REPLACE CERTIFICATION ECU

OK -- REPLACE ENGINE SWITCH