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Code 7-4: Rear Solenoid

  1. Start engine. If ABS light does not go off, go to next step. If light goes off, system is okay at this time. Check connectors and wire harness between ABS control unit, fail-safe relay and modulator.
  2. Check for ABS trouble codes. If Code 7-4 is not set, perform appropriate trouble code test. If Code 7-4 is set, remove rear fail-safe relay. Measure voltage between White wire terminal of fail-safe relay connector and ground. If battery voltage exists, go to next step. If battery voltage does not exist, repair open White wire between underhood ABS fuse/relay box and rear fail-safe relay.
  3. Test rear fail-safe relay and replace if necessary. See RELAY TEST  under DIAGNOSIS & TESTING. If rear fail-safe relay is okay, go to next step.
    NOTE: Modulator 14-pin connector has more than one Blue/Black wire. Ensure appropriate wire is tested. See WIRING DIAGRAMS  .
  4. Disconnect 14-pin modulator connector. Connect jumper wire between White wire and Blue/Black wire terminals of rear fail-safe relay. Measure voltage between modulator 14-pin harness connector terminal No. 6 (Blue/Black wire) and ground. See Figure .
  5. If battery voltage does not exist, repair open in Blue/Black wire between rear fail-safe relay and modulator. If battery voltage exists, measure voltage between modulator 14-pin harness connector terminal No. 9 (Blue/Black wire) and ground.
  6. If battery voltage does not exist, repair open in Blue/Black wire between fail-safe relay and modulator. If battery voltage exists, measure resistance between modulator connector terminals for inlet and outlet solenoids type "A" and type "B". See Figure . See SOLENOID RESISTANCE  table. If resistance is as specified, go to next step. If resistance is not as specified, inspect modulator wire harness. If wire harness is okay, replace modulator.
  7. Check continuity between 14-pin modulator connector terminal No. 2 (Yellow/White wire) and ground. If continuity does not exist, go to next step. If continuity exists, inspect modulator wire harness. If wire harness is okay, replace modulator.
  8. Check continuity between 14-pin modulator connector terminal No. 13 (Red/White wire) and ground. If continuity does not exist, go to next step. If continuity exists, inspect modulator wire harness. If wire harness is okay, replace modulator.
  9. Check for continuity between 14-pin modulator unit connector Yellow/White wire terminal and Red/White wire terminal. If continuity does not exist, go to next step. If continuity exists, replace modulator wire harness.
  10. Check for continuity between 14-pin modulator connector terminal No. 13 (Red/White wire) and terminals No. 1 (Yellow/Black wire), No. 3 (Yellow/Blue wire), No. 12 (Red/Black wire) and No. 14 (Red/Blue wire). If continuity does not exist, go to next step. If continuity exists, replace modulator wire harness.
  11. Check for continuity between 14-pin modulator connector terminal No. 2 (Yellow/White wire) and terminals No. 1 (Yellow/Black wire), No. 3 (Yellow/Blue wire), No. 12 (Red/Black wire) and No. 14 (Red/Blue wire). If continuity does not exist, go to next step. If continuity exists, replace modulator wire harness.
  12. Disconnect 26-pin ABS control unit connector. Check continuity between 26-pin connector Yellow/White wire terminal and ground. If continuity does not exist, go to next step. If continuity exists, repair short to ground Yellow/White wire between ABS control unit and modulator unit.
  13. Check continuity between 26-pin connector Red/White wire terminal and ground. If continuity does not exist, go to next step. If continuity exists, repair short to ground Red/White wire between ABS control unit and modulator unit.
  14. Check for continuity between 26-pin ABS control unit connector terminal No. 3 (Red/White wire) and No. 16 (Yellow/White wire). If continuity does not exist, go to next step. If continuity exists, repair short between Red/White and Yellow/White wires.
  15. Check for continuity between 26-pin ABS control unit connector terminal No. 3 (Red/White wire) and terminals No. 1 (Red/Blue wire), No. 2 (Red/Black wire), No. 14 (Yellow/Blue wire) and No. 15 (Yellow/Black wire). If continuity does not exist, go to next step. If continuity exists, repair short between Red/White wire and Red/Blue wire, Red/Black wire, Yellow/Blue wire or Yellow/Black wire between ABS control unit and modulator unit.
  16. Check for continuity between 26-pin ABS control unit connector terminal No. 16 (Yellow/White wire) and terminals No. 1 (Red/Blue wire), No. 2 (Red/Black wire), No. 14 (Yellow/Blue wire) and No. 15 (Yellow/Black wire). If continuity does not exist, go to next step. If continuity exists, repair short between Yellow/White wire and Red/Blue wire, Red/Black wire, Yellow/Blue wire or Yellow/Black wire between ABS control unit and modulator unit.
  17. Reconnect 14-pin modulator connector. Measure voltage between ABS control unit 26-pin connector Yellow/White wire terminal and ground. If battery voltage exists, go to next step. If battery voltage does not exist, repair open Yellow/White wire between ABS control unit and modulator.
  18. Measure voltage between ABS control unit 26-pin connector Red/White wire terminal and ground. If battery voltage exists, go to next step. If battery voltage does not exist, repair open Red/White wire between ABS control unit and modulator.
  19. Disconnect 22-pin ABS control unit connector. Check for continuity between 22-pin connector Black wire terminal and ground. If continuity exists, go to next step. If continuity does not exist, check ground connection. If ground connection is okay, repair open Black wire between ABS control unit and ground.
  20. Remove jumper wire from rear fail-safe relay. Remove front fail-safe relay. Check continuity between 22-pin ABS control unit connector Yellow/Green wire terminal and ground. If continuity does not exist, go to next step. If continuity exists, repair Yellow/Green wire shorted to ground between ABS control unit and rear fail-safe relay.
  21. Connect a jumper wire between 4-pin rear fail-safe connector Yellow/Green wire terminal and ground. Check for continuity between 22-pin ABS control unit connector terminal No. 1 (Yellow/Green wire) and ground. If continuity exists, go to next step. If continuity does not exist, repair open Yellow/Green wire between ABS control unit and rear fail-safe relay.
  22. Remove jumper wire from rear fail-safe relay connector. Check continuity between 4-pin rear fail-safe relay connector Black wire terminal and ground. If continuity does not exist, check ground connection. If ground connection is okay, repair open Black wire between rear fail-safe relay and ground. If continuity exists, check for loose ABS control unit connectors. If connectors are okay, install known-good ABS control unit and retest.
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