Code 1-2, Pump Motor Circuit
- Check ABS and rear defroster/cooling fan relay fuses and replace if necessary. Remove pump motor relay. Test relay and replace if necessary. See RELAY TEST under DIAGNOSIS & TESTING. If relay is okay, connect jumper wire between terminals No. 1 and 2 of pump motor relay connector. If pump motor does not run, go to next step. If pump motor runs, go to step 5).
- Using DVOM, measure voltage between pump motor relay connector terminal No. 2 and ground. If battery voltage is present, go to next step. If battery voltage is not present, replace underhood fuse/relay box.
- Disconnect pump motor 2-pin connector. Measure voltage between White/Blue wire terminal and ground. If battery voltage is present, go to next step. If battery voltage is not present, repair open White/Blue wire between pump motor relay and pump motor.
- Measure voltage between White/Blue wire and Black wire terminals of pump motor connector. If battery voltage is present, pump motor is defective. Replace pump assembly. If battery voltage is not present, check ground connection at right rear corner of engine compartment. If ground connection is okay, repair open Black wire.
- Disconnect jumper wire. Remove ABS unit fuse from underhood fuse/relay box. Turn ignition on. Measure voltage between indicated fuse holder terminal and ground. See Fig 1
. If battery voltage is present, go to next step. If battery voltage is not present, repair open White/Blue wire between ABS unit fuse holder and control unit.
Courtesy of AMERICAN HONDA MOTOR CO., INC.
- Re-install ABS unit fuse. Disconnect ABS pump motor connector. 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, replace underhood fuse/relay box.
- 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 Yellow/Black wire between No. 3 fuse (15-amp), located in underdash fuse box, and pump motor relay.
- Re-install pump motor relay. Disconnect 18-pin connector (models without traction control) or 20-pin connector (models with traction control) from control unit. Measure voltage between Yellow/Red wire terminal and ground. If battery voltage is not present, repair open Yellow/Red wire pump motor relay and control unit. If battery voltage is present, check for loose control unit connectors. If connectors are okay, install a known-good control unit and retest.