Circuit Description
VIN K
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 provides a signal to the PCM relative to 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, engine not running or 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 intermittely low, DTC P1107 will be set.
VIN 1
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 P1107 will be set.
Conditions for Running the DTC
| • | No TP sensor DTCs are present. |
| • | The ignition is ON. |
| • | Throttle angle is steady above 0% if engine speed is less than 1000 rpm. |
| • | Throttle angle is steady above 10% if engine speed is greater than 1000 rpm. |
Conditions for Setting the DTC
The MAP sensor intermittently indicates a manifold absolute pressure below 0.1 volt.
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 Fail 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. |
| • | DTC can be cleared by using the scan tool Clear Info function or by disconnecting the PCM battery feed. |
Diagnostic Aids
Check for the following conditions:
| • | Poor connection at PCM or 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 | Did you perform the Powertrain On-Board Diagnostic (OBD) System Check? | -- | ||
2 | Select diagnostic trouble codes (DTCs) Is DTC P0107 also set? | -- | Go to DTC P0107 Manifold Absolute Pressure (MAP) Sensor Circuit Low Voltage | |
3 | Is DTC P1122 also set? | -- | ||
4 | Inspect for poor connections at the harness connector of the MAP sensor. Refer to Repairing Connector Terminals in Wiring Systems. Did you find and correct the condition? | -- | ||
5 | Test the signal circuit of the MAP sensor for an intermittent open or short to ground. Refer to Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | ||
6 | Test the 5 volt reference circuit of the MAP sensor for an intermittent short to ground. Refer to Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | ||
7 | Inspect the 5 volt referance circuit for a poor connection at the harness connector of the PCM. Refer to Repairing Connector Terminals in Wiring Systems. Did you find and correct the condition? | -- | ||
8 | Test the 5 volt reference circuit of the MAP sensor for an intermittent open.Refer to Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Diagnostic Aids | |
9 |
Does the DTC reset? | -- | System OK |
