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.
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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 309 (ELECTRICAL COMPONENT LOCATOR)SENDING UNITS & SENSORS
1999 GMC Forward Control 5.7 R, Automatic
Sending Units & Sensors
1999 GMC Forward Control 5.7 R, AutomaticSECTION Sending Units & Sensors
WARNING: This page is about a different car, the 2004 Buick Regal and 2004 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.
SENDING UNITS & SENSORS LOCATION
| Component | Location |
|---|---|
| A/C Refrigerant Pressure Sensor | At left front strut tower, on A/C liquid line. See Figure . |
| A/C Refrigerant Pressure Sensor Connector | Left side of engine compartment. See Figure . |
| Air Temperature Sensor-Inside | At left side of dash, below instrument cluster. See Figure . |
| Air Temperature Sensor-Inside Connector | Behind center of dash. See Figure . |
| Ambient Outside Air Temperature Sensor | Front of radiator support. See Figure . |
| Ambient Light Sensor | On top right side of dash, near defogger outlet. See Figure . |
| Ambient Outside Air Temperature Sensor Connector | Right front of vehicle, behind bumper. See Figure . |
| Camshaft Position (CMP) Sensor (3.1L VIN J) | Top front of engine, below intake plenum. See Figure . |
| Camshaft Position (CMP) Sensor (3.8L VIN K) | Front of engine, above crankshaft pulley. See Figure . |
| Camshaft Position (CMP) Sensor (3.8L VIN 1) | Front of engine, above crankshaft pulley. See Figure . |
| Crankshaft Position (CKP) Sensor Connector | Above A/C compressor. See Figure . |
| Crankshaft Position (CKP) Sensor (3.8L VIN K) | Front of engine, behind harmonic balancer. See Figure . |
| Crankshaft Position (CKP) Sensor (3.8L VIN 1) | Front of engine, behind harmonic balancer. See Figure . |
| Crankshaft Position (CKP) Sensor A (3.1L VIN J) | Front of engine, behind harmonic balancer. See Figure . |
| Crankshaft Position (CKP) Sensor B (3.1L VIN J) | Right side of engine, below exhaust manifold. See Figure . |
| Engine Coolant Temperature (ECT) Sensor (3.1L VIN J) | Top left side of engine, below throttle body. See Figure . |
| Engine Coolant Temperature (ECT) Sensor (3.8L VIN K) | Top left side of engine, below throttle body. |
| Engine Coolant Temperature (ECT) Sensor (3.8L VIN 1) | Top left side of engine, below throttle body. |
| Engine Oil Level Sensor (3.8L VIN K) | Behind starter motor. See Figure . |
| Engine Oil Level Sensor (3.8L VIN 1) | Lower front of engine compartment. See Figure . |
| Fuel Level Sensor | In fuel tank. See Figure . |
| Fuel Pump & Sender Assembly | In fuel tank. |
| Fuel Tank Pressure (FTP) Sensor | On top of fuel tank. See Figure . |
| Heated Oxygen Sensor (HO2S) 1 (3.1L VIN J) | In right side exhaust manifold. See Figure . |
| Heated Oxygen Sensor (HO2S) 2 | In exhaust system, rear of catalytic converter. See Figure . |
| Inflatable Restraint Side Impact Sensor (Left Front) | At base of left "B" pillar. See Figure . |
| Intake Air Temperature (IAT) Sensor (3.1L VIN J) | Left front of engine compartment, in air cleaner duct. See Figure . |
| Intake Air Temperature (IAT) Sensor (3.8L VIN K) | Left front of engine compartment, in air cleaner duct. |
| Intake Air Temperature (IAT) Sensor (3.8L VIN 1) | Left front of engine compartment, in air cleaner duct. |
| Knock Sensor (KS) 1 (3.1L VIN J) | Lower left side of engine, above starter. See Figure . |
| Knock Sensor (KS) 1 (3.8L VIN K) | Right side of engine, in front of starter. See Figure . |
| Knock Sensor (KS) 1 (3.8L VIN 1) | Right side of engine, in front of starter. See Figure . |
| Knock Sensor (KS) 2 | Lower right side of engine, below exhaust manifold. See Figure . |
| Manifold Absolute Pressure (MAP) Sensor (3.1L VIN J) | Top right side of engine, above valve cover. See Figure . |
| Manifold Absolute Pressure (MAP) Sensor (3.8L VIN K) | Top of engine, on front of intake manifold. |
| Manifold Absolute Pressure (MAP) Sensor (3.8L VIN 1) | Top right side of engine, above valve cover. See Figure . |
| Mass Airflow (MAF) Sensor (3.1L VIN J) | Left side of engine, in air cleaner duct. See Figure . |
| Mass Airflow (MAF) Sensor (3.8L VIN K) | Top rear of engine, part of throttle body assembly. |
| Mass Airflow (MAF) Sensor (3.8L VIN 1) | Top rear of engine, part of throttle body assembly. |
| Rear Compartment Occupant Sensor | At left side of rear compartment. |
| Sun load Sensor | On top right side of dash, near defogger outlet. See Figure . |
| Throttle Position (TP) Sensor (3.1L VIN J) | On throttle body assembly. See Figure . |
| Throttle Position (TP) Sensor (3.8L VIN K) | On throttle body assembly. |
| Throttle Position (TP) Sensor (3.8L VIN 1) | On throttle body assembly. |
| Transmission Fluid Pressure (TFT) Manual Valve Position Switch Assembly | In transmission. See Figure . |
| Transmission Fluid Temperature Sensor | In transmission. See Figure . |
| Vehicle Speed Sensor (VSS) | On transaxle right axle case extension. See Figure . |
| Wheel Speed Sensor (WSS) (Left Front) | On left front wheel hub assembly. See Figure . |
| Wheel Speed Sensor (WSS) (Left Rear) | On left rear wheel hub assembly. See Figure . |
| Wheel Speed Sensor (WSS) (Right Front) | On right front wheel hub assembly. See Figure . |
| Wheel Speed Sensor (WSS) (Right Rear) | On right rear wheel hub assembly. |
RENDER: 1.0x
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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.