DTC 32

MAP Sensor Circuit:

Manifold Absolute Pressure Sensor Circuit:

CIRCUIT DESCRIPTION:

The MAP Sensor responds to changes in manifold pressure (vacuum). The ECM receives this information as a signal voltage that will vary from about 1 to 1.5 volts at closed throttle idle, to 4-4.5 volts at wide open throttle. If the MAP Sensor fails, the ECM will substitute a fixed MAP value to control fuel delivery.

TEST DESCRIPTION: Numbers below refer to circled numbers on the diagnostic chart.

1. This step will determine if Code 32 is the result of a hard failure or an intermittent condition. A Code 32 will set if:

^ MAP signal indicates greater than 3.3 in. Hg for more than 0.2 seconds (low vacuum).

2. This step simulates conditions for a Code 31. If the ECM recognizes the change, the ECM and the wire to Pressure Sensor are OK. If light GREEN/BLACK wire is open, there may also be stored Code 25.

DIAGNOSTIC AIDS:

An intermittent may be caused by a poor connection rubbed through wire insulation or a wire broken inside the insulation, Inspect ECM harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, poor terminal to wire connection and damaged harness.