Visual Inspection

Fig. 1 Remote Battery Terminals And PCM Connectors:

NOTE: Before diagnosing or servicing the fuel injection system, perform a visual inspection for loose, disconnected, or misrouted wires and hoses. A thorough visual inspection that includes the following checks saves unnecessary test and diagnostic time.

NOTE: Check for DTC's before disconnecting battery terminals.

1. Inspect remote battery cable connections.
- Be sure they are clean and tight.
- Clean corroded terminals Fig. 1.
2. Verify that the PCM 40-way connectors are fully inserted into their sockets on the PCM Fig. 1.
3. Open the Power Distribution Center (PDC).
- Check for blown fuses.
- Ensure the relays and fuses are fully seated in the PDC Fig. 1.
- A label on the underside of the PDC cover shows the locations of each relay and fuse.
4. Inspect accelerator cable, and cruise control cable (if equipped) connections.
- Check their connections to the throttle arm of the throttle body for any binding or restrictions.

Fig. 3 Idle Air Control Motor And Throttle Position Sensor:

5. Check the electrical connections at the idle air control motor and throttle position sensor Fig. 3.

Fig. 5 PCV Valve:

6. Check hose connections between the PCV valve, vacuum port-intake manifold and the oil separator Fig. 5.

Fig. 8 MAP Sensor And Intake Air Temperature Sensor:

7. Inspect the electrical connections at the intake air temperature sensor and the Manifold Absolute Pressure (MAP) sensor Fig. 8.

Fig 10 Fuel Injectors:

8. Inspect the fuel injector electrical connections Fig. 10.

Fig 11 Ignition Coil And Spark Plugs:

9. Inspect the ignition coil electrical connector. Ensure the spark plug insulators are firmly seated over the spark plugs Fig. 11.

PCV Valve Location:

10. Inspect the electrical and hose connections at the proportional purge solenoid Fig. 43.
11. Check electrical connection to the radiator fan.
12. Inspect system body grounds for loose or dirty connections.
13. Inspect air cleaner filter element. Replace as necessary. Check air induction system for restrictions.

Fig. 14 Knock Sensor:

14. Check electrical connection at the knock sensor Fig. 14.

Fig. 16 Camshaft Position Sensor:

15. Check electrical connections at the camshaft position sensor Fig. 16.

Fig. 17 Engine Coolant Temperature Sensor:

16. Check electrical connections at the engine coolant temperature sensor Fig. 17.

Electronic EGR Transducer:

17. Check the electrical connector at the electronic EGR transducer. Inspect vacuum and back pressure hoses at the solenoid and transducer for leaks.
18. Inspect electrical connections at the generator. Check the generator belt for glazing or damage.

Fig. 21 Crankshaft Position Sensor Typical:

19. Inspect electrical connector at the crankshaft position sensor Fig 21.

Fig. 23 Output Speed Sensor--Automatic Transmission:

Fig. 24 Vehicle Speed Sensor--Manual Transmission:

20. Check electrical connection at the vehicle speed sensor Fig. 23 or 24.

Fig. 25 Power Steering Pressure Switch:

21. Check electrical connection at the power steering pressure switch on the power steering gear housing Fig. 25.

Fig. 26 Park/neutral Switch:

22. On vehicles with automatic transaxles, check the electrical connections at the park/neutral switch Fig. 26.

Fig. 27 Upstream Heated Oxygen Sensor:

23. Inspect the electrical connections at the heated oxygen sensor Fig. 27.

Fig. 31 Fuel Pump Module Electrical Connector:

24. Inspect the fuel pump module electrical connection in the trunk for corrosion or damage Fig. 31.
25. Inspect the connections to the speed control servo, if equipped. Refer to Vehicle Speed Control.