P1390
Octane Adjust Pin Out of Self-Test Range
2002-2005 Ford Explorer 4.6L V8 🇨🇦
Low SeverityPowertrain
Description
The octane adjust pin signal is not within the expected range during the self-test. This pin allows the PCM to adjust timing for different octane fuels.
Symptoms
- Check Engine Light
- Possible spark knock with low-octane fuel
- Self-test failure
Common Causes
- Faulty octane adjust shorting bar
- Wiring issue
- PCM connector problem
Diagnostic Steps
- Check octane adjust pin/shorting bar
- Inspect PCM connector
- Verify proper pin configuration for fuel grade
Repair Notes
Check octane adjust shorting bar on PCM connector. Repair wiring if damaged.
Other Powertrain Codes
- P0001Fuel Volume Regulator Control Circuit/Open
- P0001Fuel Volume Regulator Control Circuit/Open
- P0001Fuel Volume Regulator Control Circuit/Open
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0003Fuel Volume Regulator Control Circuit Low
- P0003Fuel Volume Regulator Control Circuit Low
- P0003Fuel Volume Regulator Control Circuit Low
- P0004Fuel Volume Regulator Control Circuit High
P1390 on Other Vehicles
Common Questions
What does code P1390 mean on a 2002-2005 Ford Explorer?
P1390 stands for "Octane Adjust Pin Out of Self-Test Range". The octane adjust pin signal is not within the expected range during the self-test. This pin allows the PCM to adjust timing for different octane fuels.
What are the symptoms of P1390 on a Ford Explorer?
Common symptoms of P1390 include: Check Engine Light, Possible spark knock with low-octane fuel, Self-test failure.
What causes P1390 on a 2002-2005 Ford Explorer?
Common causes of P1390 include: Faulty octane adjust shorting bar, Wiring issue, PCM connector problem.