Traction Control System

TCS Indicator Circuit Troubleshooting
1. Start the engine, and watch the TCS indicator.
Does the TCS indicator come on?
YES - If the TCS indicator comes on and goes off, it's OK. If the TCS indicator stays on, go to step 7.
NO - Go to step 2.
2. Turn the engine OFF, then restart it again.
Does the brake system indicator come on?
YES - Go to step 3.
NO - Repair open in the brake system indicator circuit.
^ Blown TURN & HAZARD (7.5 A) fuse.
^ Open in the wire between the TURN & HAZARD (7.5 A) fuse and gauge assembly.
^ Open circuit inside the fuse box.
3. Turn the engine OFF, and check the TCS indicator bulb in the gauge assembly.
Is the bulb OK?
YES - Go to step 4.
NO - Replace the TCS indicator bulb.





4. Connect the gauge assembly connector A (30P) terminal No. 29 and body ground with a jumper wire. Turn the ignition switch ON (II).
Does the TCS indicator come on?
YES - Go to step 5.
NO - Replace the printed circuit board in the gauge assembly.





5. Remove the jumper wire at the gauge assembly, and connect the ABS/TCS control unit connector B (16P) terminal No. 16 and body ground with a jumper wire.
Does the TCS indicator come on?
YES - Go to step 6.
NO - Repair open in the wire between the gauge assembly and the ABS/TCS control unit.





6. Connect the ABS/TCS control unit connector C (12P) terminal No. 2 and body ground with a jumper wire.
Does the TCS indicator come on?
YES - Repair open in the wire between the ABS/TCS control unit and body ground (G101).
NO - Check for loose ABS/TCS control unit connectors. If necessary, substitute a known-good ABS/TCS control unit, and recheck.
7. Check the R/C MIRROR (7.5 A) fuse in the driver's under-dash fuse/relay box, and reinstall the fuse if it is OK.
Is the fuse OK?
YES - Go to step 8.
NO - Replace the fuse, and recheck.





8. Measure the voltage between the ABS/TCS control unit connector A (26P) terminal No. 13 and body ground.
Is there battery voltage?
YES - Go to step 9.
NO - Repair open in the wire between the driver's under-dash fuse/relay box and ABS/TCS control unit.
9. Turn the ignition switch OFF.
10. Disconnect the ABS/TCS control unit connector A (26P) and connector B (16P).
11. Turn the ignition switch ON (II).
Does the TCS indicator go off?
YES - Check for loose ABS/TCS control unit connectors. If necessary, substitute a known-good ABS/TCS control unit, and recheck.
NO - Repair short to body ground in the wire between the gauge assembly and the ABS/TCS control unit.