Justy Hatchback 2WD L3-1.2L SOHC (MPFI) (1992)
CHECK VOLTAGE AND RESISTANCE OF FUEL PUMP AND RELAY
1.
Remove fuel pump relay.
2.
Using an ohmmeter, check the resistance of relay coil.
Connector & terminal:
Resistance:
(F78)1-(F78)3
60 - 80 Ohm @ 20° C (68° F)
3.
Connect 12 VDC to relay coil terminals and measure the resistance between the switched terminals.
Connector & terminal:
Resistance:
(F78)2-(F78)4
Below 1 Ohm
4.
Reinstall the relay.
CHECK FUEL PUMP RELAY CIRCUIT
1.
Turn key "ON".
2.
Using a voltmeter, measure the voltage between fuel pump relay connector and ground.
Connector & terminal:
Voltage:
(F78)3-Ground
Above 9V
CHECK VOLTAGE BETWEEN ECU CONNECTOR AND GROUND
1.
Turn key "ON".
2.
Using a voltmeter, check the voltage for two (2) seconds after turning the key from "OFF" to "ON". (Back probe the ECU connector.)
Connector & terminal:
Voltage:
(F119)18-Ground
Above 9V
3.
Check voltage AFTER key has been ON for two (2) seconds.
Connector & terminal:
Voltage:
(F119)18-Ground
Below 2.5V
Fuel Pump Connector
CHECK TERMINAL VOLTAGE TO FUEL PUMP
1.
Disconnect fuel pump connector.
2.
Turn key "ON".
3.
Using a voltmeter, check the voltage for two (2) seconds after turning the key from "OFF" to "ON".
Connector & terminal:
Voltage:
(R29)2-Ground
Above 9V
4.
Check voltage AFTER key has been ON for two (2) seconds.
Connector & terminal:
Voltage:
(R29)2-Ground
Below 2.5V
CHECK FUEL PUMP
Connect 12V to fuel pump connector and confirm fuel pump operates.
Connector & terminal:
Battery terminal
(R29)2
Positive terminal