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Home >> Dodge and Ram >> 2002 >> Ram Van B2500, Van Cargo, 5.9 Z >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0136: 1/2 O2 Sensor Heater Circuit Malfunction >> Testing

DTC P0136: 1/2 O2 Sensor Heater Circuit Malfunction: Testing

  1. Turn ignition on, engine not running. Using the DRBIII®, read DTCs. Is the Good Trip Counter displayed and equal to zero? If yes, go to next step. If no, go to step  7.
  2. Turn ignition off. Remove the O2 Sensor Heater Relay from Power Distribution Center (PDC). Turn ignition on, engine not running. Using the DRBIII®, actuate the ASD Relay. Using a test light connected to ground, probe both of the Fused ASD Feed circuit terminals at the O2 Sensor Heater Relay connector in the PDC. Observe the test light while actuating the ASD Relay on and off. Does the test light illuminate brightly when the relay is actuated? If yes, go to next step. If no, repair the O2 Sensor Heater Relay Feed circuit for an open and/or short to ground. Check the related fuse.
  3. Turn the ignition off. Disconnect the PCM harness connectors. PCM is located at passenger's side rear corner of engine compartment. Measure the resistance of the O2 Sensor Heater Relay Control circuit between the O2 Sensor Heater Relay connector in the PDC to the PCM harness connector. Is the resistance less than 5.0 ohms? If yes, go to next step. If no, repair the open O2 Sensor Heater Control circuit.
  4. Measure the resistance between ground and the O2 Sensor Heater Relay Control circuit at the PCM harness connector. Is the resistance less than 100 ohms? If yes, repair the short to ground in the O2 Sensor Heater Relay Control circuit. If no, go to next step.
  5. Measure the resistance of the O2 Sensor Heater Relay coil. Is the resistance greater than 100 ohms? If yes, replace the O2 Sensor Heater Relay. If no, go to next step.
  6. There are no possible causes remaining, replace and program the Powertrain Control Module.
    7. WARNING: When the engine is operating, do not stand in a direct line with the fan. Do not put your hands near the pulleys, belts or fan. Do not wear loose clothing.
  7. The conditions that set the DTC are not present at this time. With the engine running at normal operating temperature, monitor the DRBIII® parameters related to the DTC while wiggling the wiring harness. Look for parameter values to change and/or a DTC to set. Review the DRBIII® Freeze Frame information. If possible, try to duplicate the conditions under which the DTC was set. Refer to any Technical Service Bulletins (TSB) that may apply. Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or partially broken wires. Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, or corroded terminals. Were any of the above conditions present? If yes, repair as necessary. If no, test is complete.
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