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Code 55: Exhaust Gas RECIRCULATION (EGR) Temperature Sensor

NOTE: Refer to illustration for ECU connector and terminal identification. See Figure .
  1. Turn ignition switch to ON position. Using a DVOM, check voltage between ECU connector B59, terminal No. 4 (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 ECU connector terminals for good contact. Repair as necessary. If connector terminals are okay, replace ECU.
  2. Turn ignition switch to OFF position. Disconnect EGR temperature sensor connector. Using an ohmmeter, backprobe ECU and check resistance between ECU connector B59, terminal No. 4 and temperature sensor connector terminal No. 2 (Green/White wire), and between ECU connector B59, terminal No. 11 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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