P0108

DTC P0108 Baro Sensor Circuit High Voltage






Circuit Description

The PCM uses the BARO sensor to monitor atmospheric pressure and then sends a signal back to the PCM. The PCM receives this signal and then calculates fuel delivery.

Conditions for Running the DTC

The PCM performs this DTC diagnostic continuously

^ The ignition switch in the on position.

Conditions for Setting the DTC

The PCM performs this DTC diagnostic continuously.

^ The BARO signal is greater than 486 volts (202 kpa).
^ All diagnostic set conditions met for 2 seconds.

Action Taken When the DTC Sets

^ The PCM illuminates the malfunction indicator lamp (MIL) on the second consecutive drive trip that the diagnostic runs and fails.
^ The PCM records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the Failure Records will store this information. If the diagnostic reports a failure on the second consecutive drive trip, the Freeze Frame records the operating conditions at the time of failure and updates the Failure Records.

Conditions for Clearing the MIL/DTC

^ he PCM will turn the MIL off after three consecutive trips without a fault condition.
^ A History DTC will clear after forty consecutive warm-up cycles that the diagnostic does not fail (coolant temperature has risen 5°C (40°F) from start up coolant temperature and engine coolant temperature exceeds 71 °C (1 600 F) that same ignition cycle.
^ Use of a scan tool Diagnostic Aids

A malfunctioning BARO sensor can cause excessive smoke at high altitudes

An intermittent condition may be caused by the following:

^ Poor connections. A rubbed through wire insulation.
^ A broken wire inside of the insulation.

Test Description

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

3.This step will determine if the PCM is responding to a low signal voltage. This will indicate that the PCM is OK.

9.If the scan display is still less than or equal to 9 kPa by disconnecting the PCM the short to voltage is in the wiring.

10.If the voltmeter value stays the same by disconnecting the PCM the short to battery voltage is in the wiring.