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Code 55 - RECIRCULATION Gas Temperature Sensor

NOTE: Refer to illustration for connector and terminal identification. See Figure -Figure .
  1. Turn ignition on. Measure voltage between ECM 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 ECM harness connector or replace ECM. If voltages are not to specification, go to next step and check harness between ECM 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 ECM connector E31, terminal No. 4. Less than 10 ohms should be present. Measure resistance between ECM 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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