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.
2. Verify that the PCM 40-way connectors are fully inserted into their sockets on the PCM.
3. Open the Power Distribution Center (PDC).
- Check for blown fuses.
- Ensure the relays and fuses are fully seated in the PDC.
- 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. 5 PCV Valve:

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

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 10 Fuel Injectors:

8. Inspect the fuel injector electrical connections.

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. 13 Duty Cycle EVAP Purge Solenoid:

10. Inspect the electrical and hose connections at the duty cycle purge solenoid.
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. 16 Camshaft Position Sensor:

15. Check electrical connections at the camshaft position sensor.

Fig. 17 Engine Coolant Temperature Sensor:

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

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. 23 Output Speed Sensor--Automatic Transmission:

Fig. 24 Vehicle Speed Sensor--Manual Transmission:

20. Check electrical connection at the vehicle speed sensor.

Fig. 25 Power Steering Pressure Switch:

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

Fig. 26 Park/neutral Switch:

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

Fig. 27 Upstream Heated Oxygen Sensor:

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

Fig. 31 Fuel Pump Module Electrical Connector:

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