Visual Inspection

VISUAL INSPECTION

NOTE:
A visual inspection for loose, disconnected, or incorrectly routed wires and hoses should be made. This should be done before attempting to diagnose or service the fuel injection system. A visual check will help spot these faults and save unnecessary test and diagnostic time. A thorough visual inspection will include the following checks:

PROCEDURE

1. Inspect battery cable connections. They should be tight. The top of the battery should be free of corrosion and grime. Check the color of the test indicator on the top of the battery.

Engine Control Grounds:

2. Inspect the engine control system ground connections on the side of the frame rail beneath the battery.

Power Distribution Center:

Relay Identification:

3. Inspect all Power Distribution Center electrical connections. Inspect relays for signs of physical damage, and/or corrosion.

Ignition Coils:

4. Inspect ignition coil electrical connections. Verify that spark plug wire connections are complete. Check spark plug wire routing.

5. Inspect the air cleaner element for blockage or clogging.

Air Cleaner Vacuum Connections:

6. Verify that the air cleaner cover vacuum connections are tight.

7. Verify that the cruise control vacuum supply tubes are connected and in good condition.

Brake Vacuum Booster Hose:

8. Inspect the brake booster vacuum hose connections at the vacuum booster and below the throttle body.

9. Inspect the pre-heated air hose connections at the air cleaner and heat stove on the manifold. Inspect the hose for rips or tears.

Air Cleaner Vacuum Motor:

10. Inspect the air cleaner ambient air opening for blockage. Ensure that the air cleaner vacuum motor vacuum hose is connected.

Crankcase Ventilation Hoses:

11. Inspect the Crankcase Ventilation (CCV) fresh air and vacuum hoses for signs of damage or fatigue. Ensure that they are connected securely.

Throttle Body Electrical Connections:

12. Ensure that the Throttle Position Sensor (TPS) and Automatic Idle Speed Motor (AIS) electrical connectors are connected. Inspect the connections for corrosion.

Vacuum Harness Connections:

13. Inspect the vacuum harness connections at the intake manifold for damage or fatigue.

MAP Sensor:

14. Ensure that the Manifold Absolute Pressure (MAP) sensor vacuum tube and electrical connector are connected to the sensor.

Engine Ground Strap:

15. Inspect the engine ground strap and its connections for corrosion.

EGR Valve And EGR Transducer:

16. Inspect the Exhaust Gas Recirculation (EGR) valve and the Electrical EGR Transducer (EET) vacuum hoses and electrical connections.

Crankshaft Timing Sensor:

Camshaft Reference Sensor:

17. Verify that the Crankshaft Timing Sensor and Camshaft Reference Sensor electrical connectors are connected to the engine harness. Inspect the harness and connectors for corrosion.

Throttle Linkage:

18. Inspect the throttle linkage, accelerator cable, throttle cable and cruise control cable for binding or sticking conditions.

19. Check the condition of the throttle return spring, and replace the spring if it is weak.

20. Ensure that the fuel injector harness connectors are completely connected to the injectors. Inspect the connectors for corrosion.

Fuel Pressure Regulator Vacuum Hose:

21. Inspect the fuel pressure regulator vacuum hose for fatigue or damage. Replace the hose if necessary.

Coolant Temperature Sensor:

22. Verify that the Coolant Temperature Sensor (CTS) electrical connector is connected to the sensor. Inspect the sensor and connector for corrosion.

Charge Temperature Sensor:

23. Verify that the Charge Temperature Sensor electrical connector is connected to the sensor. Inspect the sensor and connector for corrosion.

24. Verify that the radiator fan electrical connections are complete. Inspect the connectors for corrosion.

Starter Motor:

25. Raise the vehicle and inspect the starter motor connections for corrosion.

Heated Oxygen Sensor:

26. Verify that the oxygen sensor electrical connector is attached and tight.

27. Verify that the alternator wiring and belt are correctly installed and tightened.

28. Verify that the hoses are securely attached to the vapor canister.

29. Check hose and wiring connections at the Fuel Pump.

30. Lower the vehicle. Inspection complete.