Accord 1985
1. Leave the ignition off.
2. Disconnect the main relay connector.
3. Connect the positive probe of the tester to the yellow-blue wire in the connector and to the ground wire - the negative probe of the tester. The tester should show battery voltage.
4. If there is no voltage, check the wires between the battery and the main relay, as well as between the computer fuse in the engine compartment.
5. Connect the positive probe of the tester to the black and yellow wire of the connector and the negative probe of the tester to the ground wire.
6. Turn on the ignition and the tester will show the battery voltage.
7. If there is no voltage, check the wires from the ignition key and the main relay, as well as fuse #11.
8. Connect the positive probe of the tester to the red/blue wire in the connector and the negative probe to ground.
9. Turn the ignition key to the "START" position. Look at the tester readings.
10. If there is no voltage, check the wires between the ignition key and the main relay, as well as to starter fuse #21.
11. Using a jumper wire, short-circuit the yellow-blue and black-yellow wires in the connector. The fuel pump should start working.
12. If the pump does not work, check the wires between the battery and the fuel pump and the wire from the fuel pump to ground (black wire).
Accord 1985-89 and Prelude 1986-89
1. Turn off the ignition.
2. Disconnect the main relay connector.
3. On 1987-89 models, check for continuity between the black wire in the connector and the ground wire.
4. Connect the positive probe of the tester to the yellow/blue wire in the connector and the negative probe of the tester to ground. (On 87-89 models this is the black wire.) The tester should show battery voltage.
5. If there is no voltage, check the wires between the battery and the main relay, as well as fuse #1 in the engine compartment.
6. Connect the positive probe of the tester to the black and yellow wire on the connector and the negative probe to the ground wire. (On '87-'89 models, this is the black wire.)
7. Turn on the ignition. The tester should show battery voltage.
8. If there is no voltage, check the wire from the ignition switch and main relay, as well as fuse #1 on an Accord or the regulator fuse on a Prelude.
9. Connect the positive probe of the tester to the red/blue (on ACCORD) or black/white (on PRELUDE) wire in the connector and connect the negative probe of the tester to the ground wire. (On 87-89 models - black wire).
10. Turn the ignition key to the "START" position. The tester should show battery voltage.
11. If there is no voltage, check the wiring between the ignition switch and the main relay, as well as fuse #10 on ACCORD or the starter signal fuse on PRELUDE.
12. Connect a jumper wire between the yellow/blue (black/yellow on 1987-89) and yellow wire for the ACCORD (yellow/blue and yellow/black wire for the 1986 PRELUDE and black/yellow and yellow/black on the 1987-89 PRELUDE) at the connector. The fuel pump should operate.
13. If the pump does not work - check the wire between the battery and the fuel pump and the wire from the fuel pump to ground (black wire).
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