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DTC P1189: Tip Sensor Circuit Low: Testing

  1. Start the engine. With the DRBIII® scan tool, read the TIP sensor voltage. Is the voltage below 0.078 of a volt? If yes, go to next step. If no, INTERMITTENT CONDITION  under SELF-DIAGNOSTIC SYSTEM.
  2. Turn the ignition off. Disconnect the TIP sensor harness connector. Ignition on, engine not running. Measure the voltage of the (K6) 5-volt supply circuit in the TIP sensor harness connector. Is the voltage between 4.5 to 5.2 volts? If yes, go to next step. If no, repair the (K6) 5-volt supply circuit.
  3. Turn the ignition off. Disconnect the TIP sensor harness connector. Ignition on, engine not running. With the DRBIII® scan tool, monitor the TIP sensor voltage. Is the voltage above 1.2 volts? If yes, replace the TIP sensor. If no, go to next step.
  4. Turn the ignition off. Disconnect the TIP sensor harness connector. Disconnect the PCM harness connectors. Measure the resistance between ground and the (A23) TIP signal circuit at the TIP sensor harness connector. Is the resistance below 100 ohms? If yes, repair the short to ground in the (A23) TIP signal circuit. If no, go to next step.
  5. 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 (K167) sensor ground circuit in the TIP sensor harness connector. Is the resistance below 100 ohms? If yes, repair the (K167) sensor ground shorted to the (A23) TIP signal circuit. If no, go to next step.
  6. 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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