Circuit Description

Manifold Absolute Pressure (MAP) sensor responds to changes in intake manifold pressure (vacuum). A 5-volt reference is applied to sensor. A variable resistor moves in relation to manifold pressure and a voltage signal is returned to VCM through MAP signal circuit. Voltage signal varies from 1.0-1.5 volts at closed throttle (high vacuum) to 4.0-4.5 volts at wide open throttle (low vacuum). A change in throttle position and engine speed should precede change in MAP. If change does not occur, MAP malfunction is present. DTC P0106 will set if MAP voltage is outside acceptable limits for more than 24 seconds. VCM utilizes MAP signal and throttle position to determine fuel delivery.

For duplication of DTC, ensure:

• Engine is running.
• No IAC, EGR or TP sensor DTCs are set.
• Change in engine speed is less than 75 RPM.
• Change in throttle position is less than 1.5 percent.
• Change in EGR flow is less than 2 percent.
• Change in IAC is less than 4 counts.
• No change in brake switch status.
• No change in clutch status (M/T).
• No change in power steering switch status.
• No change in A/C clutch status.
• Engine speed is between 400-5000 RPM.