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.
1990 Jaguar XJ6 BaseFACTORY OEM SERVICE PROCEDURE
Engine Controls - Tests W/Codes
- Introduction
- Self-Diagnostic System
- Check Engine Light
- Retrieving Codes
- Trouble Code Definition (DTC) Identification
- Diagnostic Trouble Code Fault Diagnosis
- DTC 12: Mass Airflow Sensor
- DTC 14: Engine Coolant Temperature Sensor
- DTC 16: Air Temperature Sensor
- DTC 17: Throttle Position Sensor
- DTC 18: Throttle Position Sensor
- DTC 19: Throttle Position Sensor/Mass Airflow Sensor Calibration
- DTC 22: Heated Oxygen Sensor/Fuel Pump Relay
- DTC 23: Fuel Control, Running Rich
- DTC 24: Ignition Amplifier
- DTC 26: Air Leak, Running Lean
- DTC 29: Electronic Control Module
- DTC 33: Leaking Fuel Injector
- DTC 34: Leaking Fuel Injector
- DTC 37: EGR Solenoid Valve
- DTC 39: EGR Function
- DTC 44: Heated Oxygen Sensor
- DTC 46 & 47: Idle Air Control Valve
- DTC 48: Idle Air Control Valve Position
- DTC 66: Air Injection Pump Relay
- DTC 68: Speed Sensor
- DTC 69: Park/Neutral Position Switch
- DTC 89: EVAP Canister Purge Control Valve
- Clearing Codes
- ECM Location
- Summary
Factory Service Tools
Use the Manual With the Right Hardware
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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.
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