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 that the 60-way engine controller electrical connector is fully pushed into the Single Board Engine Controller (SBEC) connector.

Single Board Engine Controller (SBEC):

2. Check that the vacuum hoses are firmly attached to the vapor canister, and that they aren't leaking.

Charcoal Canister:

3. Check the alternator wiring connections, belt condition, and belt tension.
4. Check the canister purge solenoid vacuum and electrical connections.
5. Check the EGR solenoid vacuum and electrical connections.

Solenoid Pack:

6. Check the MAP sensor vacuum and electrical connections

Manifold Absolute Pressure (MAP) Sensor:

7. Check that the engine ground strap is connected at the dash panel.

Engine Ground Strap To Dash And MAP Sensor Connections:

8. Check the ignition coil electrical connections.

Ignition Coil Connections:

9. Check that the throttle body wiring connector is fully pushed into the main wiring harness connector.

Throttle Body Wiring Connection To Main Harness:

10. Check the following electrical connectors for proper connection:
Automatic transmission 6-way connector
AIS motor 4-way connector
Throttle Position Sensor (TPS) 3-way connector
Throttle body temperature sensor 2-way connector
Fuel injector 2-way connector

Throttle Body Wiring Connections:

11. Check that the PCV vacuum hoses are securely attached to the intake manifold and the valve cover, and that the orifice plug is in the valve cover nipple.

PCV Vacuum Hose Routing:

12. Check the throttle body vacuum hose connections at the front and rear of the throttle body and ensure that there are no leaks.

Throttle Body Vacuum Ports--Front:

Throttle Body Vacuum Ports--Rear:

13. Check the heated air inlet door vacuum line condition and connection.
14. Check that the hose is connected at the EGR back pressure transducer, and make sure that the hose is in good condition and not leaking.

EGR Control Valve and Back-Pressure Transducer:

15. Check distributor's 3-way electrical connection.
16. Check that the oil pressure switch electrical connection is fully pressed on.

Distributor And Oil Pressure Switch Electrical Connections:

17. Check that the coolant temperature sensor's 2-way electrical connection is securely attached and fully pressed on.
18. Check battery ground connection at rear of cylinder head.

Coolant Temperature Sensor:

19. Check secondary ignition cable condition, connection, and routing.

Ignition Cable Routing And Connection:

20. Check that the engine harness to main wiring harness electrical connections are fully pressed into each other.

Engine Electrical Harness To Main Harness:

21. Check that the power brake and speed control vacuum lines are firmly attached and that there are no leaks.

Power Brake And Speed Control Vacuum Connections:

22. Check that all relay electrical connections are fully pushed onto their respective relays, and that the battery connections are clean and tight.

Relay Locations:

23. Check distance (speed) sensor's 2-way electrical connection for proper installation.

Distance Sensor Wiring Connection:

24. Check neutral safety switch for proper installation (Automatic Transmission only).
25. Check the torque converter lockup solenoid electrical connection (Automatic Transmission)

Transmission Wiring Connection:

26. Check that the oxygen sensor's 4-way electrical connector is fully pressed into the harness connector.

Heated Oxygen Sensor Electrical Connection:

27. Check the electrical and fuel hose connections at the fuel pump. Verify that the electrical connector is fully pushed onto the fuel pump.