Pinpoint Test A : DTCS P2681 And P2683
WARNING: This page is about a different car, the 2018 Lincoln Navigator. However, it is still accessible from the selected car via links, so may be relevant.
- A1 RETRIEVE AND RECORD ALL DTCS
- Enter the following diagnostic mode: PCM self-test.
Is DTC P2681 or P2683 present?
Yes GO to A2 No The system is operating correctly at this time. The concern may have been caused by a loose connector. - A2 CHECK THE TRANSMISSION FLUID HEATER COOLANT CONTROL VALVE POWER CIRCUIT FOR VOLTAGE
- Disconnect C1702 .
- Inspect for damaged or pushed out terminals.
- Ignition ON.
- Measure:
Positive Lead Measurement / Action Negative Lead C1702-1 Ground
Is the voltage greater than 11 volts?
Yes For DTC P2681, GO to A3. For DTC P2683, GO to A4. No If BJB fuse 36 (10A) is OK, REPAIR the open circuit. If BJB fuse 36 (10A) is not OK, REFER to the wiring diagram to identify the short circuit. - A3 CHECK THE TRANSMISSION FLUID HEATER COOLANT CONTROL VALVE CONTROL CIRCUIT FOR AN OPEN
- Ignition OFF.
- Disconnect C1915B .
Is the resistance less than 5 ohms?
Yes GO to A4 No REPAIR the circuit for an open. CLEAR the DTC. - A4 CHECK THE TRANSMISSION FLUID HEATER COOLANT CONTROL VALVE
Is the resistance between 15 and 30 ohms?
Yes Refer to PCM GUIDED ROUTINE TESTING -- NAVIGATOR . No INSTALL a new transmission fluid heater coolant control valve. CLEAR the DTC. REFER to: Transmission Fluid Heater Coolant Control Valve .