Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Diagnostic Routine B
2012 Ford Explorer AWD V6-3.5LSECTION Diagnostic Routine B
Diagnostic Routine B
Diagnostic Overview
SelectShift (TM)
Refer to Wiring Diagram Set 29 for schematic and connector information Electrical Diagrams.
Normal Operation and Fault Conditions
DTC Fault Trigger Conditions
Pinpoint Test
NOTE: If the scan tool is unable to communicate with the PCM (Powertrain Control Module) or access the transmission PIDs (Parameter Identifications), REFER to Computers and Control Systems Information.
1. Read and record all DTCs (Diagnostic Trouble Codes)
1. Install the scan tool and record all DTCs (Diagnostic Trouble Codes).
Is DTC (Diagnostic Trouble Code) P0815 set?
2. Check the upshift signal circuit for voltage
1. Ignition OFF.
2. Disconnect the selector lever C2008.
3. Inspect for damaged or pushed out terminals.
4. Ignition ON.
5. Measure the voltage on circuit CET43 (GY) from the selector lever C2008-9 to ground.
Is the voltage greater than 10 volts?
3. Check the upshift signal circuit for an open
1. Ignition OFF.
2. Disconnect the PCM (Powertrain Control Module) C175B.
3. Inspect for damaged or pushed out terminals.
4. Measure the resistance of circuit CET43 (GY) from selector lever C2008-9 to the PCM (Powertrain Control Module) C175B-23.
Is the resistance less than 5 ohms?
4. Check the upshift signal circuit for a short to ground
1. Measure the resistance of circuit CET43 (GY) from selector lever C2008-9 to ground.
Is the resistance greater than 10,000 ohms?
5. Check the signal return circuit for an open
1. Connect the PCM (Powertrain Control Module) C175B.
2. Ignition ON.
3. Measure the voltage from circuit CET43 (GY) from selector lever C2008-9 and circuit RE407 (YE/VT) selector lever C2008-8.
Is the voltage greater than 10 volts?
6. Check the downshift signal circuit for voltage
1. Ignition OFF.
2. Disconnect the selector lever C2008.
3. Inspect for damaged or pushed out terminals.
4. Ignition ON.
5. Measure the voltage on circuit CET42 (GN/VT) from selector lever C2008-10 to ground.
Is the voltage greater than 10 volts?
7. Check the downshift signal circuit for an open
1. Ignition OFF.
2. Disconnect the PCM (Powertrain Control Module) C175B.
3. Inspect for damaged or pushed out terminals.
4. Measure the resistance of circuit CET42 (GN/VT) from selector lever C2008-10 to the PCM (Powertrain Control Module) C175B-24.
Is the resistance less than 5 ohms?
8. Check the downshift signal circuit for a short to ground
1. Measure the resistance of circuit CET42 (GN/VT) from selector lever C2008-10 to ground.
Is the resistance greater than 10,000 ohms?
9. Check the signal return circuit for an open
1. Connect PCM (Powertrain Control Module) C175B.
2. Ignition ON.
3. Measure the voltage from circuit CET42 (GN/VT) from selector lever C2008-10 and circuit RE407 (YE/VT) selector lever C2008-8.
Is the voltage greater than 10 volts?
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.