Code 1-2, Pump Motor Circuit
- Check ABS fuses. Remove and check pump motor relay. See RELAY TEST under DIAGNOSIS & TESTING . Replace relay if it is defective. If relay is okay, use a jumper wire to connect terminals No. 1 and 2 of pump motor relay connector together. If pump motor does not run, go to next step. If pump motor runs, go to step 5).
- Using DVOM, measure voltage between terminal No. 2 of pump motor relay connector and ground. If battery voltage is present, go to next step. If battery voltage is not present, relay/fuse box connections are bad or relay/fuse box is defective. Repair or replace as necessary.
- Disconnect 2-pin connector from pump motor. Measure voltage between White/Blue wire and ground. If battery voltage is present, go to next step. If battery voltage is not present, repair open in White/Blue wire.
- Measure voltage between White/Blue wire and Black wire of pump motor connector. If battery voltage is present, pump motor is defective. If battery voltage is not present, check ground connection. See Fig 1
. If ground connection is okay, repair open in Black wire.NOTE: Manufacturer has revised voltage value to expect during step 5) in Acura Service News bulletin number ASN 0993-02.
- Remove ABS unit 7.5-amp fuse from underhood relay/fuse box. With ignition on, measure voltage between fuse holder terminal "A" and ground. See Fig 2 . If approximately 10 volts are present, go to next step. If approximately 10 volts are not present, repair open in White/Blue wire between ABS unit fuse holder and control unit.
- Install ABS unit 7.5-amp fuse back into underhood relay/fuse box. Measure voltage between pump relay connector terminal No. 1 and ground. See Figure . If battery voltage is present, go to next step. If battery voltage is not present, relay/fuse box connections are bad or relay/fuse box is defective. Repair or replace as necessary.
- Measure voltage between terminal No. 3 of pump motor relay connector and ground. If battery voltage is present, go to next step. If battery voltage is not present, repair open in Yellow/Black wire between No. 3 fuse (15-amp), located in underdash fuse box, and pump motor relay connector.
- Reinstall pump motor relay. Disconnect 18-pin connector from control unit. Measure voltage between Yellow/Red wire and ground. If battery voltage is not present, repair open in Yellow/Red wire. If battery voltage is present, check for loose control unit connectors. If connectors are okay, install a known good control unit and retest.