DTC 53: Modulator Unit Pump Motor Stuck On
- If ABS modulator unit pump motor runs with ignition off, replace ABS pump motor relay in underhood ABS fuse/relay block. See Figure
or Figure
. If ABS pump motor does not run with ignition off, remove ABS UNIT fuse (10-amp) in underhood ABS fuse/relay block. If fuse is not blown, go to next step. Replace fuse if blown, and retest system.
- Turn ignition on. Using DVOM, measure voltage between ground and underhood ABS fuse/relay block 4-pin connector terminal No. 2 (Green wire). See Fig 2
. If voltage is 11 volts or more, go to next step. If voltage is less than 11 volts, repair open in Green wire between ABS control unit and underhood ABS fuse/relay block. See WIRING DIAGRAMS
.
- Reinstall ABS UNIT fuse (10-amp) into underhood ABS fuse/relay block. Disconnect 2-pin connector from ABS pump motor. Using DVOM, measure voltage between ground and terminal No. 1 (White/Blue wire) of ABS pump motor connector. See Fig 1
. If voltage is 11 volts or more, go to next step. If voltage is less than 11 volts, repair open in White/Blue wire between ABS pump motor and underhood ABS fuse/relay block. See WIRING DIAGRAMS
.
- Measure voltage between terminals No. 1 and 2 of ABS pump motor connector. If voltage is less than 11 volts, repair open in Black wire between ABS pump motor connector terminal No. 2 and ground. See WIRING DIAGRAMS
. If voltage is 11 volts or more, go to next step.
- Remove ABS pump motor relay. Disconnect ABS control unit 12-pin connector. Using DVOM, check continuity between ground and ABS control unit 12-pin connector terminal No. 12 (Yellow/Red wire). See Figure
. If continuity exists, repair short to ground in Yellow/Red wire between ABS control unit and underhood ABS fuse/relay block. See WIRING DIAGRAMS. If continuity does not exist, system has returned to normal. If problem reoccurs, replace ABS control unit.
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Courtesy of AMERICAN HONDA MOTOR CO., INC.