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Code 32 - O2 Sensor

NOTE: Refer to illustration for ECU connector and terminal identification. See Figure .
  1. With engine idling at operating temperature, measure voltage between ECU connector B48, terminal No. 6 (backprobe) and ground. If voltmeter reading fluctuates between 0.1 and 1.0 volt, repair poor ECU terminal contact or replace ECU. If voltmeter reading does not fluctuate between 0.1 and 1.0 volt, go to next step.
  2. Disconnect O2 sensor connector. Measure voltage between O2 sensor connector terminal No. 4 (White wire) and ground. If voltage does not fluctuate between 0.1 and 1.0 volt, replace O2 sensor. If voltage fluctuates as described, go to next step.
  3. Disconnect ECU and O2 connectors. Measure resistance between ECU connector B48, terminal No. 6 and O2 sensor connector terminal No. 4 (White wire). Zero ohms should be present. Measure resistance between O2 sensor connector terminal No. 4 (White wire) and ground. At least one megohm should be present.
  4. If resistances are to specification, check ECU terminals for poor contact or replace ECU. If resistances are not to specification, repair harness or connector as necessary.
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