( TL19E20A20326428302FAAT00 )

Fuel Pump Circuit Troubleshooting

If you suspect a problem with the fuel pump, check that the fuel pump actually runs; when it is on, you will hear some noise if you listen to the fuel fill port with the fuel fill cap removed. The fuel pump should run for 2 seconds when the ignition switch is turned on. If the fuel pump does not make noise, check as follows:

1. Turn the ignition switch to LOCK (0).

1. Remove the driver's dashboard lower cover.

1. Remove PGM-FI main relay 2 (A) in the driver's under-dash fuse/relay box.

1. Turn the ignition switch to ON (II).

1. Measure the voltage between PGM-FI main relay 2 4P connector terminal No. 4 and body ground.

Is there battery voltage?

YES | - | Go to Step 14 .
NO | - | Go to Step 6 .

1. Turn the ignition switch to LOCK (0).

1. Remove PGM-FI main relay 1 (A) and ETCS control relay (B) in the under-hood fuse relay box.

1. Jump the SCS line with the HDS.

1. Disconnect ECM/PCM connector A (44P).

1. Disconnect the engine wire harness 23P connector at left side of engine compartment.

1. Disconnect the driver's under-dash fuse/relay box connector F (33P).

1. Connect PGM-FI main relay 1 4P connector terminal No. 2 to body ground with a jumper wire.

1. Check for continuity between driver's under-dash fuse/relay box connector F (33P) terminal No. 31 to body ground.

Is there continuity?

YES

-

- Replace PGM-FI main relay 1 .■
- If needed, replace the driver's under-dash fuse/relay box. ■

NO

-

- Repair open in the wire between under-hood fuse relay box and driver's under-dash fuse/relay box.■
- If needed, replace the under-hood fuse/relay box. ■

1. Measure the voltage between PGM-FI main relay 2 4P connector terminal No. 2 and body ground.

Is there battery voltage?

YES | - | Go to Step 20 .

NO

-

Except KN model: Go to Step 15 .
KN model:

- Replace the No. 9 FUEL PUMP (20 A) fuse in driver's the under-dash fuse/relay box.■
- Replace the driver's under-dash fuse/relay box. ■

1. Turn the ignition switch to LOCK (0).

1. Disconnect inertia switch 3P connector.

1. Connect inertia switch 3P connector terminals No. 1 and No. 3 with a jumper wire.

1. Turn the ignition switch to ON (II).

1. Measure the voltage between PGM-FI main relay 2 4P connector terminal No. 2 and body ground.

Is there battery voltage?

YES | - | Replace the inertia switch. ■

NO

-

- Replace the No. 9 FUEL PUMP (20 A) fuse in the driver's under-dash fuse/relay box.■
- Replace the driver's under-dash fuse/relay box. ■
- Repair open in wires between inertia switch and driver's under-dash fuse/relay box.■

1. Connect PGM-FI main relay 2 4P connector terminal No. 3 to body ground with a jumper wire.

1. Jump the SCS line with the HDS.

1. Disconnect ECM/PCM connector A (44P).

1. Check for continuity between body ground and ECM/PCM connector terminal A15.

Is there continuity?

YES | - | Go to Step 24 .
NO | - | Repair open in the wire between PGM-FI main relay 2 and the ECM/PCM (A15).■

1. Reinstall PGM-FI main relay 2.

1. Connect ECM/PCM connector terminal A6 to body ground with a jumper wire.

1. Turn the ignition switch to ON (II).

1. Measure the voltage between ECM/PCM connector terminal A15 and body ground.

Is there battery voltage?

YES | - | Go to Step 28 .
NO | - | Replace PGM-FI main relay 2 .■

1. Turn the ignition switch to LOCK (0).

1. Reconnect all connectors.

1. Turn the ignition switch to ON (II), and measure the voltage between driver's under-dash fuse/relay box connector F (33P) terminal No. 22 and body ground within 2 seconds.

Is there battery voltage?

YES | - | Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM, then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM. ■
NO | - | Go to Step 31 .

1. Turn the ignition switch to ON (II), and measure the voltage between driver's under-dash fuse/relay box connector F (33P) terminal No. 22 and body ground after 2 seconds.

Is there battery voltage?

YES | - | Go to Step 32 .
NO | - | If needed, replace the driver's under-dash fuse/relay box, then go to Step 32 .

1. Turn the ignition switch to LOCK (0).

1. Remove the rear seat cushion.

1. Remove the access panel from the floor.

1. Turn the ignition switch to ON (II), and measure the voltage between fuel tank unit 4P connector terminal No. 2 and body ground within 2 seconds.

Is there battery voltage?

YES | - | Go to Step 40 .
NO | - | Go to Step 36 .

1. Turn the ignition switch to LOCK (0).

1. Remove PGM-FI main relay 2.

1. Connect PGM-FI main relay 2 4P connector terminals No. 1 and No. 2 with a jumper wire.

1. Turn the ignition switch to ON (II), and measure the voltage between fuel tank unit 4P connector terminal No. 2 and body ground.

Is there battery voltage?

YES | - | Replace PGM-FI main relay 2 .■

NO

-

- Repair open in the wire between the driver's under-dash fuse/relay box (D10) and the fuel tank unit 4P connector.■
- If the wire is OK, replace the driver's under-dash fuse/relay box. ■

1. Turn the ignition switch to LOCK (0).

1. Check for continuity between fuel tank unit 4P connector terminal No. 4 and body ground.

Is there continuity?

YES | - | Replace the fuel pump. ■
NO | - | Repair open in the wire between the fuel tank unit 4P connector and G603. ■