Category: Fuel & Emissions

Idle Control System Air Conditioning Signal This signals the ECM when there is a demand for cooling from the air conditioning system. Inspection of Air Conditioning Signal. ECM CONNECTORS Check for a short in the circuit: 1. Turn the ignition switch OFF. 2. Disconnect the 12P connector from the cooling fan control unit. 3. Turn […]

Fuel Supply System Fuel Pump (cont’d) Testing Do not smoke during the test. Keep open flame away from your work area. 1. With the ignition switch OFF, disconnect the main relay connector. 2. Connect a jumper wire between the BLK/YEL wire and BLK/YEL wire . Replacement Do not smoke while working on fuel system. Keep […]

System Description The system supplies air for all engine needs. It consists of the air cleaner, air intake pipe, throttle body, EACV, fast idle mechanism, and intake manifold. A resonator in the air intake pipe provides additional silencing as air is drawn into the system. ECU EACV TO MAIN RELAY BLU/RED CHECK VALVE DASHPOT DIAPHRAGM […]

Starter Switch Signal This signals the ECM when the engine is cranking. Inspection of Starter Switch Sig- nal. NOTE: • M/T: Clutch pedal must be depressed. • A/T: Transmission in position. ECM CONNECTORS Measure voltage between ECM connector terminals C6 and A26 with the ignition switch in the start position. WIRE SIDE OF FEMALE TERMINALS […]

System Description Vacuum Connections CONTROL BOX page 11-6 PURGE CONTROL DIAPHRAGM CHARCOAL CANISTER TO TWO-WAY VALVE CHAMBER VOLUME CONTROL DIAPHRAGM DASHPOT DIAPHRAGM EGR VALVE FRONT OF VEHICLE EGR VALVE LIFT SENSOR FUEL PRESSURE REGULATOR (cont’d) System Description Vacuum Connections (cont’d) Control Box PURGE CUT-OFF SOLENOID VALVE Troubleshooting, page 11-137 CONSTANT VACUUM CONTROL (CVC) VALVE Troubleshooting, […]

Emission Control System Catalytic Converter Description The 3-way catalytic converter is used to convert hydrocarbons (HC), carbon monoxide (CO), and oxides of nitrogen (NOx) in the exhaust gas, to carbon dioxide (CO2), dinitrogen (N2) and water vapor. HOUSING CATALYST Attachments nsxe11126a (89 kB)

Air Intake System System Troubleshooting Guide NOTE: Across each row in the chart, the sub systems that could be sources of a symptom are ranked in the order they should be inspected starting with . Find the symptom in the left column, read across to the most likely source, then refer to the page listed […]

Throttle Body Description The throttle body is of the single-barrel side-draft type. The lower portion of the throttle valve is heated by engine coolant which is fed from the cylinder head. The idle adjusting screw, which increases/decreases bypass air, and the evaporative emission (EVAP) control canister port are located on the top of the throttle […]

Air Intake System Throttle Body (cont’d) Disassembly THROTTLE CABLE 22 N·m (2.2 kg-m. 16 Ib-ft) CAUTION: The throttle stop screw in non-adjustable. After reassembly, adjust the throttle cable (page 11-113). After replacement, adjust the idle speed (page 11-84). DASHPOT DIAPHRAGM Test, page 11-118 THROTTLE ANGLE SENSOR IDLE ADJUSTING SCREW O-RING Replace Attachments nsxe11116a (121 kB)

Intake Air Bypass (IAB) Control Valve Testing CAUTION: Do not adjust the IAB control valve full- close screw. It was preset at the factory. 1. Check the IAB control valve shaft for binding or sticking. 2. Check the IAB control valve for smooth movement. 3. Check that of the IAB control valve is in close […]