Honda Civic. Manual — part 12

LIFT AND SUPPORT POINTS ).

2. Turn the appropriate wheel by hand.

APPROPRIATE WHEEL

Is there brake drag?

YES - Repair the brake drag.

NO - Go to step 3.

3. Check that the appropriate wheel sensor is properly mounted (see WHEEL

SENSOR REPLACEMENT ).

Is the wheel sensor installation OK?

YES - Intermittent failure, the system is OK at this time. Check for loose
terminals between the wheel sensor 2P connector and the ABS modulator-
control unit 25P connector. Refer to INTERMITTENT FAILURES
TROUBLESHOOTING . If the vehicle continues to code, replace the ABS
modulator-control unit: Except Si model (see REMOVAL - EXCEPT SI
MODEL ), Si model (see REMOVAL - SI MODEL ).

NO - Reinstall the wheel sensor, and check the mounting position (see
WHEEL SENSOR REPLACEMENT ).

DTC 51-11: MOTOR LOCK; DTC 51-13: MOTOR RELAY OFF MALFUNCTION

1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0), then turn it ON (II) again.

DTC Appropriate Wheel

41-21

Right-front

42-21

Left-front

43-21

Right-rear

44-21

Left-rear

2008 Honda Civic GX

2006-08 BRAKES ABS System - Civic (All Except Hybrid)

4. Wait 5 seconds.
5. Operate each SOLENOID in the ABS FUNCTION TEST five times with the

HDS.

6. Check for DTCs with the HDS.

Is DTC 51-11 or 51-13 indicated?

YES - Replace the ABS modulator-control unit: Except Si model (see
REMOVAL - EXCEPT SI MODEL ), Si model (see REMOVAL - SI
MODEL ).

NO - Intermittent failure, the system is OK at this time.

DTC 51-12: MOTOR LOCK CIRCUIT MALFUNCTION

1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0), then turn it ON (II) again.
4. Check for DTCs with the HDS.

Is DTC 51-12 indicated?

YES - Go to step 5.

NO - Intermittent failure, the system is OK at this time. Check for loose
terminals at the ABS modulator-control unit 25P connector. Refer to
INTERMITTENT FAILURES TROUBLESHOOTING .

5. Turn the ignition switch to LOCK (0).
6. Check the No. 3 MTR (30 A) fuse in the under-hood fuse/relay box.

Is the fuse blown?

YES - Go to step 7.

NO - Reinstall the checked fuse, then go to step 9.

2008 Honda Civic GX

2006-08 BRAKES ABS System - Civic (All Except Hybrid)

7. Disconnect the ABS modulator-control unit 25P connector.
8. Check for continuity between ABS modulator-control unit 25P connector

terminal No. 9 and body ground.

Fig. 20: Checking Continuity Between ABS Modulator-Control Unit 25P
Connector Terminal No. 9 And Body Ground

Is there continuity?

YES - Repair short to body ground in the wire between the No. 3 MTR (30 A)
fuse in the understood fuse/relay box and the ABS modulator-control unit.

NO - Install a new No. 3 MTR (30 A) fuse in the under-hood fuse/relay box,
then go to step 10.

9. Disconnect the ABS modulator-control unit 25P connector.

10. Measure voltage between ABS modulator-control unit 25P connector terminal

No. 9 and body ground.

Fig. 21: Measuring Voltage Between ABS Modulator-Control Unit 25P

2008 Honda Civic GX

2006-08 BRAKES ABS System - Civic (All Except Hybrid)

Connector Terminal No. 9 And Body Ground

Is there battery voltage?

YES - Check for loose terminals in the ABS modulator-control unit 25P
connector. If necessary, substitute a known-good ABS modulator-control unit:
Except Si model (see REMOVAL - EXCEPT SI MODEL ), Si model (see
REMOVAL - SI MODEL ), and retest.

NO - Repair open in the wire between the No. 3 MTR (30 A) fuse in the under-
hood fuse/relay box and the ABS modulator-control unit.

DTC 52-12: MOTOR STUCK OFF

1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0), then turn it ON (II) again.
4. Operate each SOLENOID in the ABS FUNCTION TEST five times with the

HDS.

5. Check for DTCs with the HDS.

Is DTC 52-12 indicated?

YES - Replace the ABS modulator-control unit: Except Si model (see
REMOVAL - EXCEPT SI MODEL ), Si model (see REMOVAL - SI
MODEL ).

NO - Intermittent failure, the system is OK at this time.

DTC 53-01: MOTOR RELAY STUCK ON 1; DTC 53-12: MOTOR RELAY STUCK ON 2

1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0), then turn it ON (II) again.
4. Check for DTCs with the HDS.

Is DTC 53-01 or 53-12 indicated?

2008 Honda Civic GX

2006-08 BRAKES ABS System - Civic (All Except Hybrid)