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DTC P1190: Tip Sensor Circuit High: Testing

  1. Start the engine. With the DRBIII® scan tool, read the TIP sensor voltage. Is the voltage above 4.9 volts? If yes, go to next step. If no, see INTERMITTENT CONDITION  under SELF-DIAGNOSTIC SYSTEM.
  2. Turn the ignition off. Disconnect the TIP sensor harness connector. Disconnect the PCM harness connectors. Measure the resistance between the (A23) TIP signal circuit and the (K6) 5-volt supply circuit in the TIP sensor harness connector. Is the resistance below 100 ohms? If yes, repair the (A23) TIP signal circuit for a short to the (K6) 5-volt supply circuit. If no, go to next step.
  3. Turn the ignition off. Disconnect the TIP sensor harness connector. Ignition on, engine not running. Measure the voltage of the (A23) TIP signal circuit in the TIP sensor harness connector. Is the voltage above 5.2 volts? If yes, repair the short to battery voltage in the (A23) TIP signal circuit. If no, go to next step.
  4. Turn the ignition off. Disconnect the TIP sensor harness connector. Connect a jumper wire between the (A23) TIP sensor signal circuit and the (K167) sensor ground circuit. With the DRBIII® scan tool, monitor the TIP sensor voltage. Ignition on, engine not running. Is the voltage below 1.0 volt? If yes, replace the TIP sensor. If no, go to next step.
    5. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool (8815) to perform diagnosis.
  5. Turn the ignition off. Disconnect the TIP sensor harness connector. Disconnect the PCM harness connectors. Measure the resistance of the (A23) TIP signal circuit from the TIP sensor harness connector to the appropriate terminal of Miller Special Tool (8815). Is the resistance below 5.0 ohms? If yes, go to next step. If no, repair the open in the (A23) TIP signal circuit.
    6. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool (8815) to perform diagnosis.
  6. Turn the ignition off. Disconnect the TIP sensor harness connector. Disconnect the PCM harness connectors. Measure the resistance of the (K167) sensor ground circuit from the TIP sensor harness connector to the appropriate terminal of Miller Special Tool (8815). Is the resistance below 5.0 ohms? If yes, go to next step. If no, repair the open in the (K167) sensor ground circuit.
  7. Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary. If there are no possible causes remaining, replace and program the PCM. See PROGRAMMING .
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