Vehicle: 2017 Lincoln MKC, AWD, L4-2.0L Turbo, Automatic Transmission/Transaxle
Problem: This MKC was towed in with a cranks/does not start concern, and the malfunction indicator light (MIL) was on.
Case Details: The first order of business was to scan for diagnostic trouble codes (DTCs). The technician found the following 17 DTCs:
- P2138 - Throttle / Pedal Position Sensor / Switch D / E Voltage Correlation
- P2127 - Throttle / Pedal Position Sensor / Switch E Circuit Low
- P1012 - Wastegate Control Pressure Sensor Circuit Low
- P0A5B - Generator Current Sensor Circuit Low
- P0532 - A/C Refrigerant Pressure Sensor “A” Circuit Low
- P0523 - Engine Oil Pressure Sensor/Switch "A" Circuit High
- P0522 - Engine Oil Pressure Sensor/Switch "A" Circuit Low
- P051C - Crankcase Pressure Sensor Circuit Low
- P0369 - Camshaft Position Sensor B Circuit Intermittent (Bank 1)
- P0365 - Camshaft Position Sensor B Circuit (Bank 1)
- P0344 - Camshaft Position Sensor A Circuit Intermittent (Bank 1)
- P0340 - Camshaft Position Sensor A Circuit (Bank 1)
- P0237 - Turbocharger Boost Sensor A Circuit Low
- P0236 - Turbocharger Boost Sensor A Circuit Range/Performance
- P0107 - Manifold Absolute Pressure/Barometric Pressure Circuit Low Input
- P0106 - Manifold Absolute Pressure/Barometric Pressure Circuit Range/Performance Problem
- P00C6 - Fuel Rail Pressure Too Low - Engine Cranking (Bank 1)
The technician called ALLDATA Tech-Assist for advice on where to start. The consultant suggested reviewing the wiring diagrams together. They found that all the affected sensors on the list shared the same 5-volt reference from the powertrain control module (PCM).
The technician checked one of the sensors to find the 5-volt reference signal was low. He started unplugging the other sensors on the list one at a time. When he unplugged the intake camshaft position (CMP) sensor, the full 5-volts returned to all the other sensors.
Confirmed Repair: The technician replaced the CMP sensor and cleared the DTCs. The MKC cranked, started and ran perfectly. After the test drive, no DTCs returned. Fixed!
The ALLDATA Tech-Assist team fields cases like this every day. See how Tech-Assist can help your shop save time and money with on-call diagnostic support from ASE-certified Master Technicians. More Tech Tips
Not an ALLDATA customer? For access to this valuable experience-based repair data and reliable OEM information, start a free trial today.
If you would like to read more articles like this one please subscribe to ALLDATA News.