P1690
Fuel Injection Pump CKP Sensor Does Not Agree With ECM CKP Sensor
Severity
⚠️ MediumCan you drive?
Limited driving only, diagnose soon
Approx. repair cost
$28–89 (est.)
Symptoms
- Unstable engine operation
- Power dips
- Difficulty starting the engine
- Increased fuel consumption
- Check Engine Light Illuminates
Causes
- Malfunction of the fuel injection pump crankshaft position sensor
- Problems with the ECU CKP sensor
- Damaged wiring or poor contact
- Fuel injection pump module malfunction
- ECU software error
How to Fix
- Check the condition of the CKP sensors
- Check the integrity of wiring and contacts
- Read sensor operating parameters using a scanner
- Replace faulty components
- Flash the ECU if necessary