Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
1996 GMC Forward Control 4.3 Z, AutomaticFACTORY OEM SERVICE PROCEDURE
Section 35 (Engine Controls - Theory & Operation - 3.3L Gasoline)
WARNING: This page is about a different car, the 1995 Plymouth Voyager, 1995 Plymouth Grand Voyager, 1995 Dodge Grand Caravan, and 1995 Dodge Caravan. However, it is still accessible from the selected car via links, so may be relevant.
- Introduction
- Computerized Engine Controls
- Powertrain Control Module (Pcm)
- Input Devices
- Notes
- A/C Switch
- Battery Voltage
- Brake Switch
- Camshaft Position (CMP) Sensor
- Clutch Switch
- Coolant Temperature Sensor (CTS)
- Crankshaft Position (CKP) Sensor
- Ignition Sense Circuit
- Intake Air Temperature Sensor
- Manifold Absolute Pressure (MAP) Sensor
- Magnetic Ignition System (Hall Effect)
- Optical Distributor
- Heated Oxygen Sensor (HO2S)
- Park/Neutral (P/N) Switch
- Serial Communication Interface (SCI) Receive
- Cruise Control Switch
- Throttle Position Sensor (TPS)
- Transmission Overdrive Override Switch (A/T Models)
- Vehicle Speed Sensor (VSS)
- Output Signals
- Notes
- A/C Clutch Relay
- Alternator Field
- Auto Shutdown (ASD) Relay
- Canister Purge Solenoid
- Direct Ignition System
- Electric EGR Transducer (EET)
- Exhaust Gas Recirculation (EGR) Solenoid
- Fuel Injectors
- Idle Air Control (IAC) Motor
- Ignition Coil
- In-Tank Fuel Pump
- Limp-In Mode
- Malfunction Indicator Light (MIL)
- Overdrive Override Switch Indicator Light
- Overdrive Solenoid
- Radiator Fan Relay
- Serial Communication Interface (SCI) Transmit
- Shift Indicator Light
- Speed Control Servo
- Tachometer
- Torque Converter Clutch Solenoid
- Fuel System
- Ignition System
- Emission Systems
- Self-Diagnostic System
- Miscellaneous Controls
- Wiring Diagrams
Factory Service Tools
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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