P1107

Diagnostic Chart:

Wiring Diagram:

CIRCUIT DESCRIPTION

The Manifold Absolute Pressure (MAP) sensor is mounted to the top of the intake manifold. The MAP sensor measures pressure changes within the intake manifold which are an indication of engine load. The MAP sensor has a 5.0 volt reference, a ground and a signal circuit.

The MAP sensor contains a diaphragm which changes resistance based on pressure. When manifold pressure is low (high vacuum) sensor output voltage is low. When manifold pressure is high (low vacuum) sensor output voltage is high.

MAP sensor voltage (depending on altitude) can range from 1.0 - 1.5 volts at idle (high vacuum) to 4.0 - 4.9 volts at wide open throttle (low vacuum).

When the PCM senses a signal voltage lower than the normal operating range of the sensor, this DTC will set.

CONDITIONS FOR SETTING THE DTC

^ No TP sensor DTCs set.

^ MAP less than 0.24 volts.

^ All conditions are met for 0.3 second.

ACTION TAKEN WHEN THE DTC SETS

^ The DTC will be stored in the PCM memory when the diagnostic runs and fails.

^ The Malfunction Indicator Lamp (MIL) will not illuminate.

^ The PCM will record operating conditions at the time the diagnostic fails. This information will be stored in Failure Records.

CONDITIONS FOR CLEARING THE MIL/DTC

^ A history DTC will clear after 40 consecutive warm-up cycles, if no failures are reported by this or any other non-emission related diagnostic.

^ A last test failed (Current DTC) will clear when the diagnostic runs and does not fail.

^ PCM battery voltage is interrupted.

^ Using a scan tool.

DIAGNOSTIC AIDS

An intermittent DTC can be caused by electromagnetic interference (EMI). Inspect related circuits for being too close to secondary ignition wires and the alternator.

For intermittents, refer to Symptoms. Testing and Inspection

TEST DESCRIPTION

Number(s) below refer to step numbers on the diagnostic table.

2. When moving related connectors, visually/physically inspect connectors for the following:

^ Poor mating of the connector halves or a terminal not fully seated in the connector body (backed out).

^ Improperly formed or damaged terminals. All connector terminals in the related circuits should be carefully reformed or replaced to insure proper contact tension.

^ Poor terminal to wire connection. Inspect for poor crimps, crimping over wire insulation rather than the wire.

^ Dirt or corrosion on terminals. Inspect connector seals for being there and for being damaged.