Component Location
General Description

Main relay operates when Ignition ON signal is inputted to terminal 58 of ECM C113-1 connector and it supplies power to ECM, fuel pump relay, CMP, EGR actuator, throttle flap actuator, supplementary heater relay and brake switch, etc. Especially, the power supplied to ECM is used as main power of injectors, rail pressure regulator and ECM operation.

Even at engine turned OFF, when Ignition OFF signal is inputted to terminal 58 of ECM C113-1 connector, engine turns OFF as cutting fuel injection from injector. all the systems are shut dowm after 5 min.

Main relay is very important for engine operation, so careful inspection is strongly required.

DTC Detecting Condition

Item

Detecting Condition

Possible Cause

DTC Strategy

● Voltage monitoring

● Main relay circuit

● Main relay component

Enable Conditions

● Ignition "ON"

Threshold Value

● When main relay respond to Ignition - ON/OFF signal too fast

Diagnostic Time

● Immediately

Fail Safe

Fuel Cut

NO

EGR Off

NO

Fuel Limit

NO

MIL

YES

Schematic Diagram
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Schematic Diagram
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