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Code 25 Or 26 - Coolant Sensor Circuit Test

  1. Disconnect coolant sensor connector. Connect one lead of ohmmeter to terminal No. 1 of coolant sensor. Connect other lead of ohmmeter to terminal No. 2 and then terminal No. 3 of coolant sensor. If there is some resistance at both terminals, go to step 2). If resistance at one terminal and not at the other, replace coolant sensor.
  2. Make sure sensor connector is disconnected. Disconnect computer 14-wire connector. Connect ohmmeter between cavity No. 9 of 14-wire connector and terminal No. 3 of coolant sensor connector. If ohmmeter shows continuity, go to step 3). If there is no continuity, check wire for open circuit and repair.
  3. Disconnect computer 14-wire connector and coolant sensor connector. Connect ohmmeter between cavity No. 11 of 14-wire connector and terminal No. 2 of coolant sensor connector. If ohmmeter shows continuity, replace computer. If there is no continuity, inspect wire for open circuit and repair as needed.
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