Dr7, Code 25 Or 26 - Coolant Sensor Circuit Check
- Disconnect coolant sensor connector. Connect one lead of an ohmmeter to coolant sensor terminal "1". Connect other lead of ohmmeter to terminal "2" and then terminal "3" of the coolant sensor. If there is some resistance at both terminals, proceed to step 2). If there is resistance at one terminal and not at the other, replace the coolant sensor.
- Ensure sensor connector is disconnected. Disconnect computer 14-way connector. Connect an ohmmeter between cavity "9" of 14-way connector and terminal "3" of coolant sensor connector. If ohmmeter shows continuity, proceed to step 3). If there is no continuity, repair wire for open circuit.
- Disconnect computer 14-way connector and coolant sensor connector disconnected. Connect ohmmeter between cavity "11" of 14-way connector and terminal "2" of coolant sensor connector. If ohmmeter shows continuity, ensure terminal in connector cavity "11" is not spread apart causing a poor connection. If connection is okay, replace the computer. If there is no continuity, repair wire for open circuit.