Circuit Description
The manifold absolute pressure (MAP) sensor responds to changes in the intake manifold pressure. The powertrain control module (PCM) supplies a 5 volt reference and a ground for the MAP sensor. The MAP sensor provides a signal to the PCM relative to the pressure changes in the manifold. The MAP sensor signal voltage to the PCM varies from below 2 volts at idle (low manifold absolute pressure - high vacuum) to above 4 volts with the key on and the engine not running or at wide open throttle. The PCM monitors the MAP signals for voltages outside the normal range of the MAP sensor. If the PCM detects a MAP signal voltage that is excessively low, DTC P0107 is set.
Conditions for Running the DTC
| • | No TP sensor DTCs are present. |
| • | The engine is running. |
| • | The idle speed is steady. |
| • | A throttle angle above 0% if the engine speed is less than 1000 RPM. |
| • | A throttle angle above 10% if the engine speed is more than 1000 RPM. |
Conditions for Setting the DTC
| • | The MAP sensor signal voltage is less than 0.1 volt. |
| • | The above conditions are present for longer than 200 3X reference periods. |
Action Taken When the DTC Sets
| • | The PCM illuminates the malfunction indicator lamp (MIL) during the second consecutive trip in which the diagnostic test has run and failed. |
| • | The PCM stores the conditions which were present when the DTC set as Freeze Frame and Fail Records data. |
Conditions for Clearing the MIL/DTC
| • | The PCM turns the MIL off during the third consecutive trip in which the diagnostic has run and passed. |
| • | The history DTC clears after 40 consecutive warm-up cycles have occurred without a malfunction. |
| • | The DTC may be cleared by using the scan tool Clear Info function or by disconnecting the PCM battery feed. |
Diagnostic Aids
Inspect for the following conditions:
| • | A faulty connection at the PCM. Inspect the harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, and faulty terminal to wire connections. |
| • | Inspect the wiring harness for damage. If the harness appears to be OK, observe the MAP display on the scan tool while moving the connectors and the wiring harnesses related to the sensor. A change in the display indicates the location of the malfunction. |
If DTC P0107 cannot be duplicated, the information included in the Fail Records data may be useful in determining since the DTC was last set. If the DTC occurs intermittently, performing the DTC P1107 Diagnostic Chart may isolate the cause of the malfunction.
Test Description
The number(s) below refer to the step number(s) on the Diagnostic Table:
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Did you perform the Powertrain On-Board Diagnostic (OBD) System Check? | -- | ||
2 |
Is the MAP value near the specified value? | 0 V | ||
3 |
Does the scan tool indicate DTC P0107 failed? | -- | Go to Diagnostic Aids | |
4 |
Is the MAP value more than the specified value? | 4.6 V | ||
5 |
Is the MAP value near the specified value? | 4.6 V | ||
6 |
Did you complete the repair? | -- | ||
7 |
Was a problem found? | -- | ||
8 |
Was a problem found? | -- | ||
9 |
Was a problem found? | -- | ||
10 |
Did you complete the repair? | -- | -- | |
|
Important:: The replacement PCM must be programmed. Refer to Powertrain Control Module Replacement/Programming . Replace the PCM. Did you complete the repair? | -- | -- | ||
12 |
Does the scan tool indicate DTC P0107 failed? | -- | System OK |
