Initial Inspection and Diagnostic Overview

A visual inspection for loose, disconnected or mis-routed wiring and hoses should be made prior to attempting to diagnose fuel injection system malfunctions. The visual inspection should include the following checks:
1. Ensure that vacuum connections on rear of throttle body are secure.
2. Ensure that vacuum connection and purge control solenoid and charcoal canister are secure and not leaking.
3. Inspect PCV valve and ensure that valve and hose are in satisfactory condition.
4. Inspect alternator and ensure that electrical connectors are secure and that belt is properly adjusted.
5. Ensure that MAP sensor hose is securely connected at firewall connection and at sensor.
6. Ensure that air intake heated air door vacuum hose is securely connected.
7. Inspect fuel pump and fuel lines, ensuring that pump electrical connectors and fuel hoses are securely connected.
8. Inspect back pressure transducer and EGR valve, ensuring that components are securely mounted and free from leaks.
9. Ensure that black and white 60 way connector is securely seated in proper sockets in SMEC.
10. Ensure that 14 way connector is securely seated in proper sockets in SMEC. When inspecting system electrical connectors, ensure that connector terminals are not bent or damaged, preventing proper current transfer. Do not clean conductive grease from connector cavities, where applicable, as this could adversely affect system performance.
11. Ensure that purge solenoid and distance sensor two-way connectors are secure.
12. Ensure that Fuel injector, AIS motor, throttle body sensors and temperature sensor electrical connectors are secure.
13. Ensure that coolant sensor is properly mounted in thermostat housing and that electrical connector is secure.
14. Ensure that 3 wire distributor connector and oxygen sensor lead connector are secure and free from corrosion.
15. Inspect engine harness connectors, ensuring that terminals are not bent or damaged and that connectors are properly locked.
16. Ensure that all relay electrical connectors are fully seated and that battery cable connections are clean and free from corrosion.
17. Ensure that radiator fan relay and radiator temperature sensor connectors are properly seated.
18. Inspect ignition system primary and secondary wiring, ensuring that all connections are secure and free from corrosion.
19. Ensure that neutral safety switch is operating properly and that electrical connector is secure.
20. Ensure that engine ground strap is secure at dash panel and intake manifold.