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Pinpoint Test M - TCS Throttle Position Sensor Failure

  1. Check TRACTION CONTROL Light Operation

    Turn ignition off. Press accelerator to wide open throttle. Turn ignition on. If TRACTION CONTROL indicator light is off, system is functioning properly at this time. No further testing is required. If TRACTION CONTROL indicator light is on, check throttle cable adjustment. See ADJUSTMENTS . Adjust cable as necessary, then repeat step 1). If throttle cable is adjusted properly, go to next step.

  2. Check For Short To Ground

    Disconnect ABS control module 22-pin connector and Hydraulic Control Unit (HCU) 8-pin connector. See COMPONENT LOCATIONS . Connect Breakout Box (007-00033) and Adapter (007-00115). Measure resistance between breakout box test pins No. 12 and 19, and test pins No. 5 and 11. If both readings are more than 10,000 ohms, go to step 4). If either reading is 10,000 ohms or less, go to next step.

  3. Check For Short Circuit

    Disconnect 3-pin connector from TCS throttle control unit at right front of engine compartment. Measure resistance between breakout box test pins No. 12 and 19, and test pins No. 5 and 11. If both readings are more than 10,000 ohms, replace TCS control unit. If either reading is 10,000 ohms or less, repair short circuit in wiring harness between HCU and TCS control unit.

  4. Check Resistance Of Circuit No. 9

    Disconnect ABS control module 22-pin connector and Hydraulic Control Unit (HCU) 8-pin connector. See COMPONENT LOCATIONS . Connect Breakout Box (007-00033) and Adapter (007-00115). Disconnect 3-pin connector from TCS throttle control unit at right front of engine compartment. Measure resistance between breakout box test pin No. 12 and terminal No. 1 (Brown/Red wire) at 3-pin connector. If resistance is 5 ohms or less, go to next step. If resistance is more than 5 ohms, repair open Brown/Red wire. Reconnect all components, clear codes and retest system.

  5. Check Resistance Of Circuit No. 8

    Measure resistance between breakout box test pin No. 19 and terminal No. 2 (White/Red wire) at 3-pin connector. If resistance is 5 ohms or less, go to next step. If resistance is more than 5 ohms, repair open White/Red wire. Reconnect all components, clear codes and retest system.

  6. Check Resistance Of Circuit No. 7

    Measure resistance between breakout box test pin No. 11 and terminal No. 3 (Yellow/Red wire) at 3-pin connector. If resistance is 5 ohms or less, go to next step. If resistance is more than 5 ohms, repair open Yellow/Red wire. Reconnect all components, clear codes and retest system.

  7. Check TCS Control Unit Input Circuit

    Turn ignition off. With breakout box still connected, disconnect ABS control module 22-pin connector. With throttle closed, measure resistance between breakout box test pins No. 11 and 12. If resistance is 4000-8000 ohms, go to next step. If resistance is not 4000-8000 ohms, replace TCS control unit. Clear codes and retest system.

  8. Check TCS Control Unit Signal Circuit

    Measure resistance between breakout box test pins No. 12 and 19. If resistance is 5000-10,000 ohms, go to next step. If resistance is not 5000-10,000 ohms, replace TCS control unit. Clear codes and retest system.

  9. Check TCS Control Unit Input Voltage

    Reconnect TCS control unit 3-pin connector. Turn ignition on. Measure voltage between breakout box test pins No. 11 and 12. If voltage is 4.4-4.8 volts, go to next step. If voltage is not 4.4-4.8 volts, replace HCU. Reconnect all components and retest system.

  10. Check Voltage While Pressing Accelerator

    Slowly press accelerator to wide open throttle position, and measure voltage between breakout box test pins No. 11 and 12. If voltage slowly increases to 3.7-4.2 volts, system is functioning properly at this time. No further testing is required. If voltage does not slowly increase to 3.7-4.2 volts, replace TCS control unit. Reconnect all components, clear codes and retest system.
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