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Code 55 - EGR Temperature Sensor

NOTE: For ECM harness connector terminal identification, see Figure.
  1. Turn ignition on. Using a DVOM, check voltage between ECM harness connector terminal A4 (backprobe) and ground. Voltage should be 4-4.8 volts at 68°F (20°C) and 0.4-1.2 volts at 212°F (100°C). If voltage is not as specified, go to next step. If voltage is as specified, check ECM harness connector terminals for good contact. Repair as necessary. If harness connector terminals are okay, replace ECM.
  2. Turn ignition off. Disconnect EGR temperature sensor harness connector. Using an ohmmeter, backprobe ECM and check resistance between ECM harness connector terminal A4 and temperature sensor harness connector terminal No. 2 (Green/Red wire), and between ECM harness connector terminal A11 and temperature sensor harness connector terminal No. 1 (Black/Red wire). Resistance should be zero ohms for both circuits.
  3. Check resistance between sensor harness connector terminal No. 2 (Green/White wire) and ground. Resistance should be one megohm or greater. If resistances are as specified, replace EGR temperature sensor. If resistances are not as specified, repair affected circuit as necessary.
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