Engine Controls - System/Component Tests: Introduction
Before testing separate components or systems, perform preliminary inspection. Since many computer-controlled and monitored components set a trouble code if they malfunction, also perform procedures in G - TESTS W/ CODES article in the ENGINE PERFORMANCE Section.
NOTE:
Testing individual components does not isolate shorts or opens. Perform all voltage tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance unless otherwise instructed in test procedure. Use ohmmeter to isolate wiring harness shorts or opens.
ELECTRICAL COMPONENT LOCATIONS
| Component | Location | ||
|---|---|---|---|
| Circuit Breakers | (1) In Passenger Footwell, In Electronic Box | ||
| Closed Throttle Position (CTP) Switch | Part Of TP Sensor | ||
| Component Connectors | See Fig 1 | ||
| Camshaft Position (CMP) Sensor | Rear End Of Left Cylinder Head | ||
| Crankshaft Position (CKP) Sensor | On Left Side Of Cylinder Block | ||
| Data Link Connector (DLC) | Behind Left Side Of Dash | ||
| Electronic Box | In Passenger Footwell, Under Glove Box | ||
| Elect. Control Module (ECM) | Passenger Footwell, In Electronic Box | ||
| EGR Control Solenoid Valve | In Right Rear Corner Of Engine Bay | ||
| EGR Temperature Sensor | Left Rear Corner Of Engine, On EGR Valve | ||
| Engine Coolant Temperature (ECT) Sensor | To Rear Of Left Cylinder Head, On Coolant Pipe | ||
| Engine Speed Sensor | On Left Side Of Transmission Bellhousing | ||
| EVAP Control Solenoid Valve | In Right Rear Corner Of Engine Bay | ||
| Fuel Pump Relay | Under Left Side Of Instrument Panel, In Fuse/Relay Block | ||
| Fuses | In Fuse/Relay Block | ||
| Fuse/Relay Block | Behind Left Side Of Instrument Panel | ||
| Idle Air Control (IAC) Valve | Right Rear Corner Of Intake Manifold | ||
| Intake Manifold Change-Over (IMCO) Valve Control Solenoid | In Right Rear Corner Of Engine Bay | ||
| Kickdown Switch | On Throttle Body | ||
| Knock Sensor No. 1 | On Right Cylinder Bank, Under Intake Manifold | ||
| Knock Sensor No. 2 | On Left Cylinder Bank, Under Intake Manifold | ||
| Mass Airflow (MAF) Sensor | In Air Intake Hose | ||
| Power Output Stage | On Right Side Of Engine Bay Firewall | ||
| Throttle Position (TP) Sensor | On Throttle Body | ||
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