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Code 55 - Exhaust Gas RECIRCULATION (EGR) Temperature Sensor

NOTE: Refer to illustration for ECM connector terminal identification. See Figure .
  1. Turn ignition on. Using a DVOM, check voltage between ECM 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 connector terminals for good contact. Repair as necessary. If connector terminals are okay, replace ECM.
  2. Turn ignition off. Disconnect EGR temperature sensor connector. Using an ohmmeter, backprobe ECM and check resistance between ECM connector terminal A4 and temperature sensor connector terminal No. 2 (Green/Red wire), and between ECM connector terminal A11 and temperature sensor connector terminal No. 1 (Black/Red wire). Resistance should be zero ohms for both circuits.
  3. Check resistance between sensor 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 appropriate circuit as necessary.
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