Dr4 - Code 22, Code 17/22 - Coolant Sensor Circuit
- With diagnostic readout tool connected to engine, turn ignition off. Unplug connector from coolant sensor. Place system in Sensor Test Mode 04. Display should read 00°. If temperature reading is 260°, ensure wire to cavity No. 3 of 60-way connector is not shorted to ground. If wiring is okay, replace logic module (multiply reading on display by 10 for actual reading).
- If display reads correctly, connect jumper wire between terminals of coolant sensor connector. If display reads 260°, replace coolant sensor. If display reads 00°, connect one end of jumper wire to negative battery terminal. Connect other end of jumper wire to Tan/White wire terminal of coolant sensor harness connector.
- Display should read 260°. If display reads 260°, repair Black/Light Blue wire of coolant sensor harness connector for open to wiring harness splice. If display reads 00°, repair Tan/White wire for open circuit to logic module.