Inspection and Verification

Electronic Engine Controls

Overview
This section covers the sensors and units for the engine management system.

Inspection and verification
1. Verify the customer concern.
2. Visually inspect for obvious mechanical or electrical faults.

Mechanical Electrical
^ Engine oil level ^ Fuses
^ Cooling system coolant level ^ Wiring harness
^ Fuel level ^ Electrical connector(s)
^ Fuel contamination ^ Sensor(s)
/grade/quality
^ Sensor fitment/condition ^ Engine control module (ECM)
^ Viscous fan and solenoid ^ Transmission control module (TCM)

3. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step
4. Use the approved diagnostic system or a scan tool to retrieve any diagnostic trouble codes (DTCs) before moving onto the symptom chart or DTC index.
^ Make sure that all DTCs are cleared following rectification.

Make sure that all DTCs are cleared following rectification.