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Home >> Plymouth >> 1985 >> Turismo Base, 2.2 C, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> 1.6 & 2.2L Feedback Carburetor System >> Testing >> Test 7 - Checking Coolant Sensor Circuit >> Code 25 or 26

Code 25 or 26

  1. Disconnect coolant sensor connector. Connect one lead of an ohmmeter to terminal No. 1 of the coolant sensor. Connect other lead of ohmmeter to terminal No. 2 and then terminal No. 3 of the coolant sensor. If there's some resistance at both terminals, go to step 2). If there's resistance at one terminal and not at the other, replace the coolant sensor.
    Fig 1: Coolant Sensor Terminals, Computer 14-Wire Connector & Engine Coolant Sensor Connector
    G14308
  2. Make sure sensor connector is disconnected. Disconnect computer 14-wire connector. Connect an 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's no continuity, repair wire for open circuit.
    Fig 2: Computer 14-Wire Connector & Engine Coolant Sensor Connector
    G2401
  3. Disconnect computer 14-wire connector and coolant sensor connector disconnected. 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's no continuity, repair wire for open circuit.
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