DTC 25

TCS DTC 25: TCS Solenoid
1. Verify the TCS DTC.
Is TCS DTC 28 indicated?
YES - Do the appropriate troubleshooting for DTC 28.
NO - Go to step 2.
2. Turn the ignition switch OFF.
3. Disconnect modulator unit connector and ABS/TCS control unit connector A (26P).





4. Check for continuity between appropriate ABS/TCS control unit connector A (26P) TCS solenoid circuit terminal and body ground (see table).
Is there continuity?
YES - Repair short to body ground in the appropriate solenoid circuit wire between the ABS/ TCS control unit and the modulator unit.
NO - Go to step 5.
5. Connect the modulator unit connector.





6. Check for continuity between appropriate ABS/TCS control unit connector A (26P) solenoid circuit terminal and body ground (see table).
Is there continuity?
YES - Replace the modulator unit.
NO - Go to step 7.
7. Disconnect the modulator unit connector.





8. Connect the appropriate modulator unit connector TCS solenoid circuit terminals to body ground with a jumper wires (see table).





9. Check for continuity between the appropriate ABS/TCS control unit connector A (26P) solenoid circuit terminal and body ground (see table).
Is there continuity?
YES - Go to step 10.
NO - Repair open in the appropriate TCS solenoid circuit wire between the ABS/TCS control unit and the modulator unit.
10. Remove the jumper wires from the modulator unit connector.
11. Connect the modulator unit connector.





12. Remove the TCS relay, and connect the ABS fail-safe relay connector terminal No. 2 to body ground with a jumper wire.

NOTE: Wire colors of the ABS fail-safe relay connector; BLU, RED/BLU, BRN/BLK, GRN/YEL.





13. Check the resistance between the appropriate ABS/ TCS control unit connector A (26P) terminal and body ground (see table). NOR, NOL, NCR, NCL: 8 - 10 ohms (at 20° C, 68° F)
Is the resistance OK?
YES - Go to step 16.
NO - Go to step 14.
14. Disconnect the modulator unit connector, and remove the jumper wire from the TCS relay connector terminal.





15. Check for continuity between the modulator unit connector terminal No. 17 and the TCS relay terminal No. 2.
Is there continuity?
YES - Replace the modulator unit.
NO - Repair open in the wire between the modulator unit and the TCS relay.
16. Disconnect the modulator unit connector, and remove the jumper wire from the TCS relay connector terminal.








17. Check for continuity between the appropriate ABS/TCS control unit connector A (26P) terminal and all other ABS and TCS solenoid circuit terminals (see table).
Is there continuity?
YES - Repair short in the appropriate wires between the ABS/TCS control unit and the modulator unit.
NO - Go to step 18.
18. Connect the modulator unit connector.








19. Check for continuity between the appropriate ABS/ TCS control unit connector A (26P) terminal and all other ABS and TCS solenoid circuit terminals (see table).
Is there less than 3 ohms?
YES - Replace the modulator unit.
NO - Check for loose ABS/TCS control unit connectors. If necessary, substitute a known-good ABS/TCS control unit, and recheck.