Circuit Description
The manifold absolute pressure (MAP) sensor responds to changes in 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 pressure changes in the manifold. The MAP sensor signal voltage to the PCM varies from below 2 volts at idle to above 4 volts with the key on and the engine not running or at wide-open throttle. The PCM monitors the MAP signal for voltage outside the normal range of the MAP sensor. If the PCM detects a MAP signal voltage that is intermittently low, DTC P1107 is set.
Conditions for Running the DTC
- No throttle position (TP) sensor DTCs are present.
- The ignition is on.
- The throttle angle is steady above 6% if the 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 stores the conditions which were present when the DTC set as Fail Records data only.
Conditions for Clearing the MIL/DTC
| • | A history DTC clears after 40 consecutive warm-up cycles have occurred without a malfunction. |
| • | 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 or the MAP sensor. Inspect the PCM 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 a scan tool while moving the connectors and wiring harnesses related to the sensor. A change in the display indicates 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 | Use a scan tool in order to 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 P1122 or P1635 also set? | -- | ||||||||
4 | Inspect for a faulty 5 volt reference A circuit or manifold absolute pressure (MAP) signal circuit terminal connection at the MAP sensor. Was a problem found? | -- | ||||||||
5 | Test the MAP signal circuit between the MAP sensor connector and the PCM for an intermittent open or a short to ground. Was a problem found? | -- | ||||||||
6 | Test for an intermittent open or a 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 | Inspect for a faulty 5 volt reference A terminal connection at the PCM. Was a problem found? | -- | ||||||||
8 | Test 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) in the 5 volt reference A circuit and/or the MAP signal circuit as necessary. Refer to Connector Repairs in Wiring Systems. Did you complete the repair? | -- | -- | |||||||
10 | Repair an intermittent open/short circuit in the wiring harness as necessary. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | -- | |||||||
11 |
Does the scan tool indicate DTC P1107 Failed This Ign? | -- | System OK |
