Fuel Pump & Fuel Pump Circuit Check

DIAGNOSTIC CHART

Diagnostic Chart:

CHECK OPERATING SOUND OF FUEL PUMP

Make sure fuel pump operates for two seconds after turning ignition switch ON.

CHECK FUEL PUMP GROUND CIRCUIT

1. Turn ignition OFF.
2. Unplug fuel pump connector.
3. Measure resistance of harness connector between fuel pump and body.

Connector & Terminal Resistance
(R38) 3 - body 10 ohms max.

CHECK POWER SUPPLY TO FUEL PUMP

Voltage Test:

1. Turn ignition ON.
2. Measure voltage of power supply circuit between fuel pump connector and body.

Connector & Terminal Voltage
(R38) 1 - body 10 V min.

CHECK HARNESS CONNECTOR BETWEEN FUEL PUMP AND FUEL PUMP RELAY

Harness Test:

1. Turn ignition OFF.
2. Measure resistance of harness connector between fuel pump and fuel pump relay.

Connector & Terminal Resistance
(R38) 1 - (B41) 4 10 ohms max.

CHECK FUEL PUMP RELAY

Fuel Pump Relay:

1. Unplug connectors from fuel pump relay and main relay.
2. Remove fuel pump relay and main relay with bracket.
3. Connect battery to fuel pump relay connector terminals No. 1 and No. 3.
4. Measure resistance between connector terminals of pump relay.

Connector & Terminal Resistance
No. 2 - 4 10 ohms max.

CHECK HARNESS CONNECTOR BETWEEN ECM AND FUEL PUMP RELAY

Harness Test:

1. Unplug ECM connectors.
2. Measure resistance of harness connector between ECM and fuel pump relay.

Connector & Terminal Resistance
(E29) 8 - (B41) 3 10 ohms max.