Visual Component Inspection
VISUAL INSPECTION
NOTE:
A visual inspection for loose, disconnected, or incorrectly routed wires and hoses should be made before attempting to diagnose or service 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:
PROCEDURE
Engine Controller Connector:
1. Verify that the 60-way connector is fully inserted into the socket on the engine controller.
Vapor Canister And Connections:
2. Verify that hoses are securely attached to vapor canister.
3. Verify that alternator electrical wiring and the drive belt are correctly installed.
Engine Ground Strap Connection:
4. Verify that engine ground strap is attached at the engine dash panel.
Ignition Coil And Connections:
5. Check ignition coil electrical connections.
Distributor And Oil Pressure Switch Connections:
6. Verify that 3-way connector is attached to distributor.
Heated Oxygen Sensor Electrical Connection:
7. Verify that 4-way connector is attached for heated oxygen sensor.
EGR/Air Switching/Canister Purge Solenoids Electrical Connections:
8. Verify that the 2-way connector is attached to the air switching solenoid.
EGR/Air Switching/Canister Purge Solenoids Electrical Connections:
9. Verify that the 2-way connector is attached to the canister purge solenoid.
EGR/Air Switching/Canister Purge Solenoids Electrical Connections:
10. Verify that the 2-way connector is attached to the EGR solenoid.
EGR/Air Switching/Canister Purge Solenoids Vacuum Connections:
11. Verify that vacuum connection at air switch solenoid is secure and not leaking.
EGR/Air Switching/Canister Purge Solenoids Vacuum Connections:
12. Verify that vacuum connection at canister purge solenoid is secure and not leaking.
EGR/Air Switching/Canister Purge Solenoids Vacuum Connections:
13. Verify that vacuum connection at EGR solenoid is secure and not leaking.
Engine Harness Connections:
14. Verify engine harness to main harness connections are fully inserted.
Throttle Body Temperature Sensor:
15. Verify that the 2-way connector is attached to the throttle body temperature sensor.
Throttle Position Sensor/MAP Sensor:
16. Verify that the 3-way connector is attached to the MAP sensor.
Throttle Position Sensor/MAP Sensor:
17. Verify MAP sensor vacuum hose is attached at MAP sensor.
Throttle Position Sensor/MAP Sensor:
18. Verify that the 3-way connector is attached to the throttle position sensor.
Throttle Body Electrical Connection:
19. Verify that 4-way connector is attached to ISC actuator.
Throttle Body Electrical Connection:
20. Verify that the 4-way connector is attached to the harness for the fuel injectors. Verify the connector for the idle speed control actuator is connected to the actuator.
Throttle Body Vacuum Connections - Front:
Throttle Body Vacuum Connections - Rear:
21. Verify that vacuum connections on the front and rear of throttle body are secure and not leaking.
Throttle Body Vacuum Connections - Front:
22. Verify that heated air door and MAP sensor vacuum connections are connected and not leaking.
Throttle Body Vacuum Connections - Rear:
23. Verify that hose from PCV valve is securely attached to the manifold vacuum port.
24. Verify power brake vacuum connectors are attached to intake manifold.
EGR Valve And Transducer:
25. Verify that hoses are attached to the EGR valve back pressure transducer.
Coolant Temperature Sensor:
26. Verify that 2-way connector is attached to coolant temperature sensor.
Power Brake And Speed Control Vacuum Connections:
27. Verify speed control vacuum connectors are tight.
28. Verify that all ignition cables are in correct order and seated into place.
Engine Compartment Relays:
29. Verify that all electrical connectors are fully inserted into relays and that battery connections are clean and tight.
Vehicle Speed Sensor:
30. Check two-way distance (speed) sensor electrical connector.
Vehicle Speed Sensor:
31. On automatic transmission equipped vehicles, verify that the neutral safety switch electrical connector is in place.
Transmission Electrical Connections:
32. If vehicle is equipped with a lock-up torque convertor, check torque converter lockup solenoid electrical connection.
Transmission Electrical Connections:
33. If vehicle has overdrive (42RH or 46RH automatic transmission), check overdrive solenoid electrical connection.
34. Check hose and wiring connections at fuel pump. Be sure that wiring connector is making contact with terminals on pump.