GB. Checking the Fuel Pump

GB. Checking the fuel pump.

GB1




Checking the voltage supply at the electrical distribution box
- Ignition off.
- Remove fuse no.1.
Check that the fuse is whole.




Connect a voltmeter between the lower connection on the fuse unit (1) and ground.
The voltmeter should show battery voltage.

If the value differs:
The fault is ahead of the fuse.
^ Check the wire between fuse 1 and the battery.

If the value is correct:
^ Checking the voltage supply to the fuel pump GB2.

GB2




Checking the voltage supply to the fuel pump
- Remove fuse no.11.
Check that fuse 11 is whole.




Connect a voltmeter between the lower connection on the fuse unit (11) and ground.
- Operate the starter motor.
The voltmeter should show battery voltage.

If the value differs:
The fault lies ahead of the fuse.
^ Connection of measurement box GB6.

If the value Is correct:
^ Checking the voltage supply to the fuel pump GB3.

GB3




Checking the chassis connection
- Ignition off.
- Remove the panels on the left side of the boot.
- Pull apart the connector halves for the fuel pump.
Connect an ohmmeter between 4 in the connector (wiring harness) and ground.
The ohmmeter should show approx. 0 ohms.

If the value is OK:
^ Checking the voltage supply at the fuel pump GB4.

If the value differs:
^ Check the fuel pump's chassis connection in the boot for signs of breakage.

GB4




Checking the voltage supply at the fuel pump
- Fuel pump disconnected.
Connect a voltmeter
between 1 and 2 on the connector with the wiring harness.
- Operate the starter motor.
The voltmeter should show battery voltage.

If the value is OK:
^ Checking the fuel pump's resistance GB5

If the value differs:
^ Check the wiring between fuse 11 and the connector for signs of breakage according to CD. CD. Checking of Wiring

GB5




Checking the fuel pump resistance
- Ignition off.
Connect an ohmmeter between 1 and 4 on the connector with the fuel pump.
The ohmmeter should show 1-2 r2

If the value Is OK:
^ Measurements show there is nothing wrong with the fuel distribution system.

If the value differs:
^ Check the connections and if they are OK, replace the fuel pump.

GB6




Connection of measurement box
Connect the measurement box and check the chassis connections according to N1-N2. N. Measurement Box, Signal Description
^ Continue with Checking of voltage supply (30-supply) GB7.

GB7




Checking of voltage supply (30-supply)
- Connect the control unit to the measurement box.
- Insert fuse no.1.
- Ignition off.
Connect a voltmeter between #4 and #5 (ground).
The voltmeter should show battery voltage.

If the value is OK:
^ Checking the voltage from the ignition lock (15-supply) GB8.

If the value differs:
^ Check the wire between #4 and fuse 1 for signs of a break according to CD. CD. Checking of Wiring

GB8




Checking the voltage from the ignition lock (15-supply)
- Ignition on.
Connect the voltmeter between #35 and #5 (ground). The voltmeter should show battery voltage.
Check that there is voltage even when the starter motor operates.

If the value is OK:
^ Checking the engine speed signal from Rex-I GB9.

If the value differs:
^ Check the wire between #35 and the ignition lock via fuse 1 for breakage according to CD. CD. Checking of Wiring

GB9




Checking the engine speed signal from Rex-I
Connect a voltmeter between #1 and #5 (ground).
- Operate the starter motor.
The voltmeter should show 7-8 volts.

If the value Is correct:
^ Checking the signal to the pump relay GB10.

If the value differs:
^ Check the wire between Regina and Rex-I for breakage according to CD. CD. Checking of Wiring

GB10




Checking the signal to the pump relay
- Ignition on.
Connect a voltmeter between #20 and #5 (ground).
The voltmeter should show battery voltage.

If the value differs:
^ Test [1][2]system relay GB11.




- Operate the starter motor.
Voltage should drop to about 0 Volts.

If the value is OK:
^ Checking the injector circuit GB12.

If the value differs:
^ Test with a new control unit.

GB11




Testing the [1][2]system relay
- Test with a new [1][2]system relay.
- Repeat the most recent measurement.

If the value is OK:
^ The [1][2]system relay was damaged

If the value still deviates:
^ Check the wire between the control unit and the [1][2]system relay for breakage according to CD. CD. Checking of Wiring

GB12




Checking the injector circuit
- Ignition on.
Connect a voltmeter between #18 and #17 (power ground).
The voltmeter should show battery voltage.

If the value differs:
^ Check the wires leading to the injectors for breakage or short circuit to ground according to CD. CD. Checking of Wiring




- Operate the starter motor.
Connect a voltmeter between #1 8 and #35 (battery volt age).
The voltmeter should show 300-500 mV.

If the value is OK:
^ The engine should start.

If the value differs:
^ Test with a new control unit.