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 183 (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 2003 Pontiac Aztek and 2003 Buick Rendezvous. 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 | Left side of engine compartment, below air cleaner assembly. |
| Ambient Air Temperature Sensor | In front of radiator, behind right headlight. See Figure . |
| Auto Level Control Sensor (AWD) | Mounted to rear crossmember, above rear axle, behind left rear wheelhouse. |
| Auto Level Control Sensor (FWD) | Above rear axle, on rear crossmember. |
| Camshaft Position (CMP) Sensor | On top front of engine. See Figure . |
| Crankshaft Position (CKP) Sensor A | On lower right side of engine. See Figure . |
| Crankshaft Position (CKP) Sensor B | On front of engine, behind harmonic balancer. See Figure . |
| Daytime Running Lamp Ambient Light Sensor | Center of dash, near defrost vent. |
| Engine Coolant Temperature (ECT) Sensor | On top rear of engine, near thermostat housing. See Figure . |
| Evaporative Temperature Sensor | In HVAC module, mounted to evaporator coil. |
| Front Wheel Speed Sensor (Left/Right) | On respective front hub assembly. |
| Fuel Tank Pressure Sensor | Inside fuel tank. |
| Heated Oxygen Sensor (HO2S 1) | At right side of engine, on exhaust manifold. |
| Heated Oxygen Sensor (HO2S 2) | On exhaust system, behind catalytic converter. |
| Inflatable Restraint Side Impact Sensor (Left) | At base of left "B" pillar, above seat belt retractor. |
| Inflatable Restraint Side Impact Sensor (Right) | At base of right "B" pillar, above seat belt retractor. |
| Intake Air Temperature (IAT) Sensor | Near throttle body, in air intake duct. See Figure . |
| Knock Sensor (KS) | On lower left side of engine, above starter. See Figure . |
| Manifold Absolute Pressure (MAP) Sensor | On top front of engine. See Figure . |
| Mass Airflow (MAF) Sensor | At left side of engine compartment, on air cleaner housing. See Figure . |
| Rear Parking Assist Sensors | Mounted to rear fascia. |
| Rear Wheel Speed Sensor (Left/Right) | On respective rear hub assembly. |
| Sunload Sensor | Center of dash, mounted to trim plate, near windshield defrost vent. |
| Throttle Position Sensor | Top of engine, on rear side of throttle assembly. |
| Transaxle Fluid Temperature Sensor | Inside automatic transaxle. |
| Vehicle Speed Sensor | On transaxle. |
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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.