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 62 (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 2002 GMC Savana and 2002 Chevrolet Chevy Express. However, it is still accessible from the selected car via links, so may be relevant.
SENDING UNITS & SENSORS LOCATION
| Component | Location |
|---|---|
| Accelerator Pedal Position (APP) Sensor (6.5L VIN F) | Below dash, attached to accelerator pedal. See Figure . |
| Ambient Air Temperature Sensor | Behind front grille, near oil cooler lower mount. |
| Automatic Transmission Input Shaft Speed (A/T ISS) Sensor | On left side of transmission. |
| Camshaft Position (CMP) Sensor (4.3L VIN W) | Part of distributor, top rear of engine. |
| Camshaft Position (CMP) Sensor (5.0L VIN M) | Part of distributor, top rear of engine. See Figure . |
| Camshaft Position (CMP) Sensor (5.7L VIN R) | Part of distributor, top rear of engine. See Figure . |
| Camshaft Position (CMP) Sensor (8.1L VIN G) | On left front of engine. See Figure . |
| Crankshaft Position (CKP) Sensor (4.3L VIN W) | On lower front of engine, near crankshaft. See Figure . |
| Crankshaft Position (CKP) Sensor (5.0L VIN M) | On lower left front of engine, near crankshaft. |
| Crankshaft Position (CKP) Sensor (5.7L VIN R) | On lower left front of engine, near crankshaft. |
| Crankshaft Position (CKP) Sensor (6.5L VIN F) | On lower left front of engine, near crankshaft. See Figure . |
| Crankshaft Position (CKP) Sensor (8.1L VIN G) | On left rear of engine, near transmission. See Figure . |
| Engine Coolant Temperature (ECT) Sensor (4.3L VIN W) | On top front of engine. |
| Engine Coolant Temperature (ECT) Sensor (5.0L VIN M) | On top front of engine. |
| Engine Coolant Temperature (ECT) Sensor (5.7L VIN R) | On top front of engine. |
| Engine Coolant Temperature (ECT) Sensor (6.5L VIN F) | On top front of engine. |
| Engine Coolant Temperature (ECT) Sensor (8.1L VIN G) | On right side of engine. |
| Engine Oil Pressure (EOP) Sensor (4.3L VIN W) | On top rear of engine. See Figure . |
| Engine Oil Pressure (EOP) Sensor (5.0L VIN M) | On top rear of engine. See Figure . |
| Engine Oil Pressure (EOP) Sensor (5.7L VIN R) | On top rear of engine. See Figure . |
| Engine Oil Pressure (EOP) Sensor (6.5L VIN F) | On top rear of engine. See Figure . |
| Engine Oil Pressure (EOP) Sensor (8.1L VIN G) | On top rear of engine. See Figure . |
| Fuel Pump & Sender Assembly (Except 6.5L VIN F) | In fuel tank, under rear of vehicle. |
| Fuel Tank Pressure Sensor | In fuel tank. |
| Fuel Temperature Sensor (6.5L VIN F) | On top center of engine, on fuel injection pump. See Figure . |
| Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1 | In exhaust pipe, in front of catalytic converter. |
| Heated Oxygen Sensor (HO2S) Bank 1 Sensor 2 | In exhaust pipe, in back of catalytic converter. |
| Heated Oxygen Sensor (HO2S) Bank 2 Sensor 1 | In exhaust pipe, in front of catalytic converter. |
| Heated Oxygen Sensor (HO2S) Bank 2 Sensor 2 | In exhaust pipe, in back of catalytic converter. |
| Inflatable Restraint Front End Discriminating Sensor | On lower center of radiator support. |
| Intake Air Temperature (IAT) Sensor (4.3L VIN W) | On front of engine compartment, part of air intake duct. |
| Intake Air Temperature (IAT) Sensor (5.0L VIN M) | On front of engine compartment, part of air intake duct. |
| Intake Air Temperature (IAT) Sensor (5.7L VIN R) | On front of engine compartment, part of air intake duct. |
| Intake Air Temperature (IAT) Sensor (8.1L VIN G) | On front of engine compartment, part of air intake duct. |
| Knock Sensor (KS) (4.3L VIN W) | On top rear of engine. See Figure . |
| Knock Sensor (KS) (5.0L VIN M) | On right side of engine. |
| Knock Sensor (KS) (5.7L VIN R) | On right side of engine. |
| Knock Sensor (KS) Bank 1 (8.1L VIN G) | On lower left side of engine. See Figure . |
| Knock Sensor (KS) Bank 2 (8.1L VIN G) | On lower right side of engine. |
| Manifold Absolute Pressure (MAP) Sensor (4.3L VIN W) | On top right side of engine. See Figure . |
| Manifold Absolute Pressure (MAP) Sensor (5.0L VIN M) | On top right side of engine. |
| Manifold Absolute Pressure (MAP) Sensor (5.7L VIN R) | On top right side of engine. |
| Manifold Absolute Pressure (MAP) Sensor (8.1L VIN G) | On top rear of intake manifold. See Figure . |
| Mass Airflow (MAF) Sensor | Part of air intake duct, front top of engine. |
| Passlock Sensor | Inside top of steering column. |
| Throttle Position (TP) Sensor (4.3L VIN W) | On left side of throttle body. See Figure . |
| Throttle Position (TP) Sensor (5.0L VIN M) | On left side of throttle body. |
| Throttle Position (TP) Sensor (5.7L VIN R) | On left side of throttle body. |
| Throttle Position (TP) Sensor (8.1L VIN G) | On left side of throttle body. |
| Turbocharger Boost Sensor (6.5L VIN F) | On top right front of engine. |
| Vehicle Speed Sensor (VSS) (4L60-E) | On right side of transmission. |
| Vehicle Speed Sensor (VSS) (4L80-E) | On left side of transmission. |
| Water-In-Fuel Indicator Sensor (6.5L VIN F) | On left frame rail, near center of vehicle, part of fuel filter/manager. See Figure . |
| Wheel Speed Sensor (WSS) (Left Front) | On inside of left front wheel. |
| Wheel Speed Sensor (WSS) (Right Front) | On inside of right front wheel. |
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.