P1106

CIRCUIT DESCRIPTION

The Manifold Absolute Pressure (MAP) sensor is a sensor that changes resistance based upon manifold vacuum. The PCM provides a 5 volt reference and ground. The MAP sensor signal varies between ground and 5 volts as manifold vacuum varies. As MAP decreases, voltage decreases (low engine load, high vacuum). As MAP increases, voltage increases (high engine load, low vacuum). The PCM uses the MAP sensor values as an indicator of engine load. DTC P1106 sets when the PCM detects a MAP sensor signal that is too high.

CONDITIONS FOR SETTING THE DTC

Test Conditions

^ DTCs P0107, P0108, P0122 and P0123 not set.
^ Engine running.
^ Throttle angle 20.5 degrees or less.

Failure Condition

The MAP sensor reading has been 5.06 volts or greater too long.

ACTION TAKEN WHEN THE DTC SETS

^ The Malfunction Indicator Lamp (MIL) will not illuminate.
^ No message will be displayed.

CONDITIONS FOR CLEARING THE DTC

^ A History DTC will clear after forty consecutive warm-up cycles with no failures of any non-emission related diagnostic test.
^ 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

DTC P1106 may set due to random engine backfires or mechanical problems. Check for possible mechanical causes of high manifold pressure. If no mechanical causes are found, perform Powertrain Ground Check table.

TEST DESCRIPTION

Number(s) below refer to the step number(s) on the Diagnostic Table.

2. If DTC P0108 is also set, diagnose it first because it may help to diagnose an intermittent MAP sensor.