Component Location
Description

The voltage after the fuel pump relay is used to supply power to the electric fuel pump in the low pressure line.

When the ignition switch is in starting position, the battery voltage is supplied from the fuel pump relay to the ECM.

When the ignition switch is turned on, current flows from the ignition switch through the current the fuel pump relay coil to ground by the ECM. And then, the voltage is supplied to the electric fuel pump to drive.

In case of the fuel pump relay failure, the engine symptoms will occur the running engine stall and the starting impossible.

If the signal exceeds threshold value, the ECM judged this as a fault and DTC is set.

DTC Detecting Condition

Item

Detecting Condition

Possible Cause

DTC Strategy

● Circuit continuity check

● Contact resistance in connectors

● Short to battery in relay control circuit

● Fuse blown

● Faulty relay

● Faulty ECM

Enable Conditions

● Ignition on

Threshold Value

● Short for relay control circuit

Diagnostic Time

● 0.48 sec.

MIL

Fuel Limit

Fuel Cut

EGR Off

● No

● No

● No

● No

Schematic Diagram
Signal Waveform
Яндекс.Метрика