Visual Inspection

A visual inspection for loose, disconnected, damaged, or misrouted wires and/or hoses should be made prior to diagnosing or servicing the fuel injection system. A thorough visual inspection will help find these faults and save unnecessary testing and diagnostic time.

VISUAL INSPECTION

1. Check the ignition coil electrical connections.

Solenoid Connections:

2. Check the canister purge solenoid and the wastegate solenoid vacuum and electrical connections.

Manifold Absolute Pressure (MAP) Sensor:

3. Check the MAP sensor vacuum and electrical connections.
4. Check the vacuum hoses and connections between the vacuum source and canister purge, wastegate, and barometric read solenoids.

Vapor Canister:

5. Check the hose connections at the vapor canister.
6. Check the alternator wiring connections and belt condition.
7. Check secondary ignition cable routing and connections.
8. Check the radiator fan electrical connections.

Oil Pressure And Crankshaft Sensor Connections:

9. Check the oil pressure sending unit electrical connection.

Camshaft Sensor:

10. Check the camshaft and crankshaft sensor electrical connections.

Coolant And Engine Temperature Sensors:

11. Check the coolant temperature and engine temperature sensor electrical connections.
12. Check the battery ground connections at the engine.
13. Check the intake manifold electrical wiring condition and connections.
14. Check the engine and fuel injection harness to main harness electrical connections.
15. Check power brake booster and speed control vacuum line condition and connections.

Relay Location/Identification:

17. Check all electrical relay connections.
18. Check battery terminal connections for cleanliness and tightness.

Single Board Engine Controller (SBEC):

19. Check the engine controller connectors for proper seating.

Throttle Body:

20. Check the automatic idle speed motor electrical connection.
21. Check the throttle position sensor electrical connection.
22. Check the hose connections at the throttle body.
23. Check all vacuum lines at the intake manifold for proper routing and connections.
24. Check the vacuum hose and connections between the vacuum source and the fuel pressure regulator.

Vacuum And Electrical Connections:

25. Check the charge temperature sensor electrical connection.
26. Check the fuel injectors electrical connections.

Detonation (Knock) Sensor:

27. Check the detonation sensor electrical connections.
28. Check the oxygen sensor electrical connection.
29. Check the engine ground strap between the intake manifold and dash panel for condition and connections.
30. Check the turbocharger and control valve hose connections and condition.

Vehicle Speed Sensor (VSS):

31. Check the distance sensor electrical connections.
32. Check the fuel pump fuel hose and electrical wiring condition and connections.