Vehicle applicability: This diagnostic supplement covers multiple Ford vehicles and engines. Follow the application named in the source below. Some references apply to vehicles other than Mustang.
Powertrain DTC Charts and Descriptions 4-53
Diagnostic Trouble Code (DTC) Charts and Descriptions
P0309 - Cylinder 9 Misfire Detected (Continued)
• Evaporative emission system
• Exhaust gas recirculation (EGR) system
• Base engine
• Misfire monitor neutral profile correction has not been relearned since the last mechanical repair
Diagnostic Aids: Misfire is defined as lack of combustion in a cylinder due to absence of spark, incorrect fuel metering, low
compression, or any other cause. The malfunction indicator lamp (MIL) blinks once per second when a misfire severe enough to cause catalyst damage is detected. If the MIL is on steady state due to a misfire, this indicates the threshold for emissions was exceeded and caused the vehicle to fail an inspection and maintenance tailpipe test.
Application Key On Engine Off Key On Engine Running Continuous Memory
All GO to Pinpoint Test HD.
P0310 - Cylinder 10 Misfire Detected
Description: This DTC sets when the misfire detection monitor detects an engine misfire in cylinder 10.
Possible Causes: • Ignition system
• Fuel injector 10
• Running out of fuel
• EVAP canister purge valve
• Fuel pressure
• Evaporative emission system
• Exhaust gas recirculation (EGR) system
• Base engine
• Misfire monitor neutral profile correction has not been relearned since the last mechanical repair
Diagnostic Aids: Misfire is defined as lack of combustion in a cylinder due to absence of spark, incorrect fuel metering, low
compression, or any other cause. The malfunction indicator lamp (MIL) blinks once per second when a misfire severe enough to cause catalyst damage is detected. If the MIL is on steady state due to a misfire, this indicates the threshold for emissions was exceeded and caused the vehicle to fail an inspection and maintenance tailpipe test.
Application Key On Engine Off Key On Engine Running Continuous Memory
All GO to Pinpoint Test HD.
P0313 - Misfire Detected With Low Fuel
Description: This DTC sets when an engine misfire fault is detected with low fuel level.
Possible Causes: • Customer driving habits
• Low fuel or no fuel in tank (less than 1/8 tank)
Diagnostic Aids: Verify the fuel level is above 1/8 before diagnosing engine misfire DTCs.
Application Key On Engine Off Key On Engine Running Continuous Memory
All GO to Pinpoint Test HD.
P0315 - Crankshaft Position System Variation Not Learned
For Neutral Profile Correction Using Scan Tool
Description: The PCM has not learned the crankshaft pulse wheel tooth spacing. This DTC disables the misfire monitor.
Possible Causes: • PCM reprogramming
• PCM replacement
• Internal PCM non-volatile random access memory (NVRAM) error
Diagnostic Aids: Complete the Misfire Monitor Neutral Profile Correction procedure using the scan tool.
For All Others
Description: The PCM is unable to learn and correct for mechanical inaccuracies in crankshaft pulse wheel tooth spacing.
This DTC disables the misfire monitor.
Possible Causes: • Damaged crankshaft pulse wheel teeth
• Damaged crankshaft position (CKP) sensor
2016 Powertrain Control/Emissions Diagnosis, Gasoline Engines, 3/2015
2016 Mustang workshop publication supplied to Mustang Atlas. Original technical text and illustrations; HTML formatting by Mustang Atlas. Source page numbering is retained for traceability. Follow the configuration, revision, warnings, and cross-references in the material. About this edition.