Montero 4WD V6-2972cc 3.0L SOHC (1991)
OPERATION TEST
To test the pump operation, connect a 12 Volt power source to the pump test connector (located in the right kick panel). Remove the fuel cap and listen
through the fuel filler neck for the sound of the pump. If the pump operates during the operational test, continue with the harness test. If no pump sound
is heard, check the ground circuit (step #1) and also test the control relay. If no faults are found, replace the fuel pump.
HARNESS TEST
1. Disconnect the fuel pump connector located on the fuel tank. Using an Ohmmeter, check the ground circuit of the fuel pump between the harness
connector terminal 1 and ground.
Continuity:
Should exist.
2. Using an Ohmmeter, check for continuity between the fuel pump check connector and the fuel pump harness connector terminal 2.
Continuity:
Should exist.
3. Disconnect the ECU connector and the control relay connector. Using an Ohmmeter, check for continuity between the ECU harness connector
terminal 13 and the control relay harness connector terminal 2.
Continuity:
Should exist.
4. Turn the key to the ON position. Measure the supply voltage of the control relay from the battery. Using a voltmeter, measure the voltage between
the control relay connector terminal 3 and ground.
Voltage:
System voltage.
5. Turn the key to the START position. Measure the supply voltage of the control relay from the ignition switch. Using a voltmeter, measure the
voltage between the control relay connector terminal 9 and ground.
Voltage:
8 or more volts.
6. Using an Ohmmeter, check for continuity between the ECU harness connector terminal 30 and ground.
Continuity:
Should not exist.
7. Using an Ohmmeter, check for continuity between the ECU harness connector terminal 30 and the control relay harness connector terminal 7.
Continuity:
Should exist.
8. Using an Ohmmeter, check for continuity of the ground circuit between the control relay harness connector terminal 6 and ground.
Continuity:
Should exist.
9. Using an Ohmmeter, check for continuity between the control relay terminal 2 and ground.
Continuity:
Should not exist.
10. Using an Ohmmeter, check for continuity between the fuel pump harness terminal 2 and ground.
Continuity:
Should not exist.
11. Using an Ohmmeter, check for continuity between the control relay terminal 2 and the fuel pump connector 2.
Continuity:
Should exist.
