P0107

Manifold Absolute Pressure (MAP) Sensor Circuit Low Voltage:

Manifold Absolute Pressure (MAP) System:

Circuit Description

The Manifold Absolute Pressure (MAP) sensor measures the change in the intake manifold pressure (vacuum). The Powertrain Control Module (PCM) provides a 5 volt reference voltage to the MAP sensor. The change in the pressure, that results from engine load and RPM changes, is converted into a voltage input that is monitored by the PCM. A low voltage reading at the PCM indicates low manifold pressure, and a high voltage reading at the PCM indicates high manifold pressure.


Conditions for Setting the DTC

^ Low voltage input at the PCM indicating manifold absolute pressure below 5 kPa or less.
^ The above condition is met for at least 0.5 seconds.

Action Taken When the DTC Sets

^ The Malfunction Indicator Lamp (MIL) will illuminate.
^ The PCM will record operating conditions at the time the diagnostic fails. This information will be stored in the Freeze Frame buffer.

Conditions for Clearing the MIL/DTC

^ The MIL will turn "OFF" after three consecutively passing cycles without a fault present.
^ A History DTC will clear after 40 consecutive warm-up cycles without a fault.
^ DTC(s) can be cleared by using a scan tool or by disconnecting the PCM battery feed.

Diagnostic Aids

Check The Following Conditions:

^ Poor connection at PCM. Inspect hamess connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, and poor terminal to wire connection.
^ Damaged harness. Inspect the wiring harness for damage. If the harness appears to be OK, observe the MAP display on the scan tool while moving connectors and wiring harnesses related to the MAP sensor. A change in the MAP display will indicate the location of the fault.
^ Check for a clogged or pinched vacuum hose to the MAP sensor.
^ If DTC P0107, P0122 set together it is possible to have an open or shorted to ground reference circuit (LT. GRN wire).

If DTC P0107 cannot be duplicated, the information included in the Freeze Frame data can be useful in determining vehicle operating conditions when the DTC was first set.

If any wiring repairs need to be made, Refer to Repair Procedures in Diagrams.


Test Description

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

1. The Powertrain OBD system check prompts the technician to complete some basic checks and store the freeze frame data on the scan tool if applicable. This creates an electronic copy of the data taken when the fault occurred. The information is then stored in the scan tool for later reference.
2. Determines if the fault is present.
3. Review Freeze Frame data to determine when the DTC set. Always record this information.
4. Checks the 5 volt reference circuit.
5. Checks the signal return circuit.