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Code 55 - RECIRCULATION Gas Temperature Sensor

NOTE: Refer to illustration for ECU connector and terminal identification. See Figure -Figure .
  1. Turn ignition on. Measure voltage between ECU connector E31, terminal No. 4 (backprobe) and ground. At 68°F (20°C), 4-4.8 volts should be present. At 212°F (100°C), .4-1.2 volts should be present. If voltages are to specification, repair ECU harness connector or replace ECU. If voltages are not to specification, go to next step and check harness between ECU and recirculation gas temperature sensor.
  2. Turn ignition off. Disconnect recirculation gas temperature sensor connector. Measure resistance between gas temperature sensor connector terminal No. 1 (Black/White wire) and ECU connector E31, terminal No. 4. Less than 10 ohms should be present. Measure resistance between ECU connector E31, terminal No. 4 and ground. At least one megohm should be present.
  3. If resistances are not to specification, repair or replace harness. If resistances are to specification, replace recirculation gas temperature sensor.
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