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 that the engine ground strap is attached at the engine and the firewall.
5. Check that the electrical connections are properly connected to the ignition coil.
Ignition Coil Connections:
6. Check that the EGR solenoids 2-way electrical connector and vacuum connector are securely attached to the EGR solenoid.
7. Check that the canister purge solenoids 2-way electrical connector and vacuum connector are securely attached to the canister purge solenoid.
Solenoid Pack:
8. Check the MAP sensors 3-way electrical connector and vacuum connection are completely pushed into the MAP sensor.
MAP Sensor Electrical And Vacuum Connections:
9. Check that the throttle body electrical connections are securely attached to the main wiring harness electrical connections and that they are fully pressed into each other.
Throttle Body Wiring Harness To Main Harness:
10. Check that the Automatic Idle Speed (AIS) motor 4-way electrical connector is securely attached to the AIS motor.
11. Check the throttle position sensors 3-way electrical connector is completely pushed into the throttle position sensor.
12. Check that the throttle body temperature sensor electrical connector is securely attached and fully pushed into the sensor.
13. Check that the fuel injector 2-way electrical connector is pushed all the way into the injector.
Throttle Body Wiring Connections:
14. Check that the PCV vacuum hose from the valve is securely attached to the intake manifold vacuum port and that the orifice plug is in the valve cover.
PCV Vacuum Hose:
15. 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:
16. Check that the vacuum connection to the air cleaner heated inlet diaphragm is securely attached and not leaking.
17. Check that the vacuum hose is connected at the EGR back pressure transducer, and make sure that the hose is in good condition and not leaking.
Back Pressure Transducer:
18. Check that the coolant temperature sensor's 2-way electrical connection is securely attached and fully pressed on.
19. Verify that the negative battery cable eyelet is connected to the rear of the cylinder head.
Coolant Temperature Sensor:
20. Check that the distributor 3-way electrical connector is securely attached and fully pressed on.
Distributor And Oil Pressure Switch Electrical Connections:
21. Check secondary ignition cable condition, connection, and routing.
22. Check that the engine harness electrical connections are securely attached to the main wiring harness electrical connections and that they are fully pressed into each other.
Engine Electrical Harness To Main Harness:
23. Check that the power brake vacuum lines are firmly attached and that there are no leaks.
Power Brake And Speed Control Vacuum Connections:
24. Check that all relay electrical connections are fully pushed onto their respective relays in the power distribution center, and that the battery connections are clean and tight.
Power Distribution Center:
25. Check distance (speed) sensor's 2-way electrical connection for proper installation.
Transmission Wiring Connections:
26. Check the electrical and fuel hose connections at the fuel pump. Verify that the electrical connector is fully pushed onto the fuel pump.