FUEL SYSTEM DIAGRAM

Refer to the Component Identification portion of this section for a more complete description of the components shown in Fig. 1.

VISUAL INSPECTION

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

(1) Check ignition cable routing from the coil pack to the spark plugs. Verify the cable are routed in the correct order and are fully seated to the coil and spark plug.

(2)Check direct ignition system (DIS) coil electrical connection for damage and a complete connection to the coil (Fig. 2).

(3)Verify the camshaft sensor electrical connector is connected to the harness and not damaged (Fig. 3).

(4)Ensure the engine temperature sensor electrical connector is connected to the sensor and not damaged (Fig. 3).

(5)Ensure the coolant temperature sensor electrical connector is connected to the sensor and not damaged (Fig. 4).

(6)Verify the quick connect fuel fittings are fully inserted on the fuel supply and return tubes.

(7)Check the vacuum hose connection at the fuel pressure regulator for damage or leakage (Fig. 5).

Fig. 2 Ignition Coils Electrical Connection

Fig. 3 Camshaft Sensor

Fig. 5 Fuel Pressure Regulator Vacuum Connection

(8) Check the oil pressure sending unit electrical connection (Fig. 6).

Fig. 6 Oil Pressure Sending Unit Electrical Connec-

tion

(9)Verify the electrical connector is attached to the Purge Solenoid (Fig. 7) and not damaged.

(10)Verify the vacuum connection at the purge solenoid is secure and not leaking (Fig. 7).

(11)Verify the hoses are securely attached to the vapor canister (Fig. 8).

(12)Ensure the harness connectors for the fuel injector are attached to the correct injector and not damaged.

(13)Verify the fuel injector harness and engine wiring harness connectors are fully inserted into the main wiring harness.

(14)Check the vacuum connections at the throttle body (Fig. 9).

(15)Ensure the AIS motor and TPS electrical connectors are fully seated and not damaged (Fig. 9).

(16)Verify the harness connector is attached to the electric EGR transducer solenoid (Fig. 9).

Fig. 8 Vapor Canister

(17) Verify the vacuum connections at the transducer are secure (Fig. 9). Check all EGR system vacuum hoses for secure connections. Inspect the EGR tube.

Fig. 9 Throttle Body Electrical and Vacuum Connec-

tions

Fig. 10 Automatic Transmission Electrical Connec-

tions

(19) Check the Vacuum Hose Harness connections at the Intake Plenum (Fig. 11).

Fig. 11 Vacuum Hose Connections

(20)Inspect the PCV system connections for damage (Fig. 12).

(21)Inspect the crankshaft position sensor electrical connector for damage (Fig. 13).

(22)Ensure the distance sensor electrical connector is attached to the sensor and not damaged (Fig. 13).

(23)Verify the manifold absolute pressure (map) sensor electrical connector is attached to the sensor and not damaged (Fig. 14).

Fig. 12 PCV System

Fig. 13 Crankshaft Sensor and Vehicle Distance

Sensor Electrical Connections

(24)Verify the engine ground strap is attached at the engine and dash panel (Fig. 14). Inspect the strap for corrosion or damage.

(25)Check the heated oxygen sensor electrical connector for damage (Fig. 14).

(26)Inspect the alternator wiring connections for damage.

(27)Check the accessory drive belt tension.

(28)Check the 60-way electrical connection at the Engine Controller (Fig. 15) for damage or spread terminals. Verify that the 60-way connector is fully inserted into the engine controller socket. Ensure the wires are not stretched or pulled out of the connector.

(29)Check for full insertion of the relays in the power distribution center (Fig. 16).

(30)Check battery cable connections.

(31)Check the power brake booster hose connection (without Anti-lock Brake Systems) (Fig. 17).

(32)Check the speed control vacuum connection (Fig. 18).

Fig. 14 MAP Sensor, Heated Oxygen Sensor, and

Ground Strap

Fig. 15 Engine Controller

Fig. 16 Power Distribution Center

(33) Inspect hose and wiring connections at fuel pump. Check that wiring connector is making contact with terminals on pump.