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 MANUALSCHEVROLET1999EXPRESS 1 TON VAN V8-5.7L VIN RREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTESTING AND INSPECTIONSCAN TOOL TESTING AND PROCEDURESSCAN TOOL DATA, NORMAL VALUES AND DEFINITIONSSCAN TOOL DATA DEFINITIONS - POWERTRAIN SYSTEMSMANIFOLD ABSOLUTE PRESSURE (MAP)
1999 Chevrolet Express 1 Ton Van V8-5.7L VIN R
Manifold Absolute Pressure (MAP)
1999 Chevrolet Express 1 Ton Van V8-5.7L VIN RSECTION Manifold Absolute Pressure (MAP)
Range (10-104 kPa)
The Manifold Absolute Pressure (MAP) sensor measures the change in intake manifold pressure caused by engine load and engine speed changes. During WOT, MAP will be maximum. During decel, vacuum will be high in the intake and MAP will be displayed at its minimum pressure.
Range (0.0-5.0 Volts)
The MAP sensor produces a low signal voltage when the manifold pressure is low. A low MAP voltage indicates a high vacuum in the intake manifold. The MAP sensor produces a high signal voltage when the manifold pressure is high. A high MAP voltage indicates a low vacuum in the intake manifold. With the ignition ON and the engine OFF, the manifold pressure equals the ambient atmospheric pressure. This will produce a relatively high MAP signal voltage. The VCM uses this information as an indication of the vehicle's altitude. This parameter is referred to as the BARO.
The Manifold Absolute Pressure (MAP) sensor measures the change in intake manifold pressure caused by engine load and engine speed changes. During WOT, MAP will be maximum. During decel, vacuum will be high in the intake and MAP will be displayed at its minimum pressure.
Range (0.0-5.0 Volts)
The MAP sensor produces a low signal voltage when the manifold pressure is low. A low MAP voltage indicates a high vacuum in the intake manifold. The MAP sensor produces a high signal voltage when the manifold pressure is high. A high MAP voltage indicates a low vacuum in the intake manifold. With the ignition ON and the engine OFF, the manifold pressure equals the ambient atmospheric pressure. This will produce a relatively high MAP signal voltage. The VCM uses this information as an indication of the vehicle's altitude. This parameter is referred to as the BARO.
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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.