DTC 54

ABS DTC 54: ABS Fail-safe Relay
1. Check the ABS F/S (20 A) fuse in the under-hood fuse/relay box, and reinstall the fuse if it is OK.
Is the fuse OK?
YES-Reinstall the fuse, and go to step 2.
NO-Replace the fuse, and recheck. If the fuse blows with the ignition switch OFF, repair short to body ground between the under-hood fuse/relay box and ABS fail-safe relay.
2. Turn the ignition switch ON (II).
Does the fuse blow?
YES-Repair short to body ground in the wire between the ABS fail-safe relay, TCS relay, pump motor relay, and modulator unit.
NO-Go to step 3.
3. Check the ABS fail-safe relay in the under-hood ABS relay box. The wire colors of the ABS fail-safe relay connector are WHT/GRN, BRN/BLK, BLK, and YEL/GRN.
Is the relay OK ?
YES-Leave the ABS fail-safe relay removed, and go to step 4.
NO-Replace the ABS fail-safe relay.





4. Measure the voltage between the ABS fail-safe relay 4P connector terminal No. 1 and body ground.
Is there battery voltage?
YES-Go to step 5.
NO-Repair open in the wire between the underhood fuse/relay box and the ABS fail-safe relay.





5. Connect the ABS fail-safe relay 4P connector terminals No. 1 to No. 2 with a jumper wire.
6. Disconnect the modulator unit 24P connector.





7. Measure the voltage between terminal No.2 and body ground.
Is there battery voltage ?
YES-Go to step 8.
NO-Repair open in the wire between the ABS fail-safe relay and the modulator unit.
8. Remove the jumper wire from the ABS fail-safe relay connector.





9. Measure the voltage between the modulator unit 24P connector terminal No. 2 and body ground.
Is there battery voltage?
YES-Repair short to power in the wire between the ABS fail-safe relay, TCS relay, modulator unit, and under-hood ABS relay box.
NO-Go to step 10.
10. Disconnect the ABS/TCS control unit connector A (26P).
11. Turn the ignition switch ON (II).





12. Measure the voltage between terminal No. 25 and body ground.
Is there battery voltage?
YES-Repair short to power in the wire between the ABS/TCS control unit and the ABS fail-safe relay.
NO-Go to step 13.





13. Check for continuity between the ABS/TCS control unit connector A (26P) terminal No. 25 and body ground.
Is there continuity?
YES-Repair short to body ground in the wire between the ABS/TCS control unit and the ABS fail-safe relay.
NO-Go to step 14.





14. Check for continuity between the ABS fail-safe relay 4P connector terminal No. 3 and body ground.
Is there continuity?
YES-Go to step 15.
NO-Repair open in the wire between the ABS fail-safe relay and body ground, or a loose or poor connection at body ground (G202).





15. Connect the ABS fail-safe relay 4P connector terminals No. 3 and No. 4 with a jumper wire.





16. Check for continuity between the ABS/TCS control unit connector A (26P) terminal No. 25 and body ground.
Is there continuity?
YES-Check for loose ABS/TCS control unit connectors. If necessary, substitute a known-good ABS/TCS control unit, and recheck.
NO-Repair open in the wire between the ABS/TCS control unit and the ABS fail-safe relay.