Circuit Description
The Manifold Absolute Pressure (MAP) sensor responds to changes in intake manifold pressure. The PCM supplies a 5 volt reference and a ground for the MAP sensor. The MAP sensor circuit provides a signal to the PCM relative to pressure changes in the manifold. With the key ON, engine not running, the MAP sensor signal voltage to the PCM varies between 1.5 to 2.5 volts. With the engine running, the MAP sensor voltage to the PCM varies from below 2 volts at idle (low manifold absolute pressure - high vacuum) to above 4 volts at wide-open throttle (high manifold absolute pressure - low vacuum). 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 intermittently low, DTC P01107 will be set.
Conditions for Setting the DTC
| • | The ignition is on and the engine is running. |
| • | The MAP sensor intermittently indicates a manifold absolute pressure below 0.1 volt. |
| • | Above conditions for over 10 seconds. |
Action Taken When the DTC Sets
| • | The PCM will not illuminate the malfunction indicator lamp (MIL). |
| • | The PCM will store conditions which were present when the DTC set as Failure Records data only. This information will not be stored as Freeze Frame data. |
Conditions for Clearing the MIL/DTC
| • | A History DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction. |
| • | The DTC can be cleared by using the scan tool Clear Info function. |
Diagnostic Aids
Check for the following conditions:
| • | Poor connection at the PCM or the MAP sensor |
| Inspect PCM harness 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 sensor. A change in the display will indicate the location of the malfunction. |
Reviewing the Fail Records vehicle mileage since the diagnostic test last failed may help determine how often the condition that caused the DTC to be set occurs. This may assist in diagnosing the condition.
Step | Action | Value(s) | Yes | No | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
1 | Was the Powertrain On-Board Diagnostic (OBD) System Check performed? | -- | ||||||||
2 | Select DTC info, Last Tst Fail and note any other DTCs set. Is DTC P0107 also set? | -- | Go to DTC P0107 Manifold Absolute Pressure (MAP) Sensor Circuit Low Voltage | |||||||
3 | Is DTC P1122 also set? | -- | ||||||||
4 | Check for a poor 5 volt reference A circuit or MAP signal circuit terminal connection at the MAP sensor. Was a problem found? | -- | ||||||||
5 | Check the MAP signal circuit between the MAP sensor connector and the PCM for an intermittent open or short to ground. Was a problem found? | -- | ||||||||
6 | Check for an intermittent short to ground on the 5 volt reference A circuit between the PCM and the following components:
Refer to Wiring Repairs in Wiring Systems. Was a problem found? | -- | ||||||||
7 | Check for a poor 5 volt reference A terminal connection at the PCM. Was a problem found? | -- | ||||||||
8 | Check for an intermittent open in the 5 volt reference A circuit. Was a problem found? | -- | Go to Diagnostic Aids | |||||||
9 | Replace the malfunctioning harness connector terminal(s) for the 5 volt reference A circuit and/or the MAP signal circuit as necessary. Refer to Repairing Connector Terminals in Wiring Systems. Is action complete? | -- | -- | |||||||
10 | Repair intermittent open/short circuit in wiring harness as necessary. Refer to Wiring Repairs in Wiring Systems. Is Action complete? | -- | -- | |||||||
11 |
Does scan tool indicate DTC P1107 failed? | -- | System OK |
