Circuit Description
VIN K
The manifold absolute pressure (MAP) sensor will respond to pressure changes in the intake manifold which gives an indication of the engine load. The MAP sensor has a 5-volt reference circuit, a low reference circuit, and a signal circuit. The powertrain control module (PCM) supplies 5 volts to the MAP sensor on the 5-volt reference circuit and provides a ground on the low reference circuit. The MAP sensor provides a signal to the PCM on the signal circuit which is relative to the pressure changes in the manifold. With low manifold absolute pressure such as during idle or during deceleration, the PCM should detect a low signal voltage. With high manifold absolute pressure such as the following, the PCM should detect a high signal voltage:
| • | The ignition is ON, with the engine OFF. |
| • | At a wide open throttle (WOT) |
This MAP sensor will indicate pressure between 10-104 kPa. The MAP sensor is also used in order to calculate the barometric pressure (BARO) when the ignition is ON, with the engine OFF. The BARO reading may also be updated when the engine is operated at a wide open throttle. The PCM monitors the MAP sensor signal for voltage that is out of the normal range. If the PCM detects a MAP sensor signal voltage that is low, DTC P0107 will set.
VIN 1
The MAP sensor will respond to pressure changes in the intake manifold which gives an indication of the engine load. The MAP sensor has a 5-volt reference circuit, a low reference circuit, and a signal circuit. The PCM supplies 5 volts to the MAP sensor on the 5-volt reference circuit and provides a ground on the low reference circuit. The MAP sensor provides a signal to the PCM on the signal circuit which is relative to the pressure changes in the manifold. With low manifold absolute pressure such as during idle or during deceleration, the PCM should detect a low signal voltage. With high manifold absolute pressure such as at a wide-open throttle, the PCM should detect a high signal voltage. This MAP sensor will indicate pressure between 8-208 kPa. The MAP sensor is also used in order to calculate the BARO when the ignition switch is turned ON, with the engine OFF. The PCM monitors the MAP sensor signal for voltage that is out of the normal range. If the PCM detects a MAP sensor signal voltage that is low, DTC P0107 will set.
Conditions for Running the DTC
| • | The ignition is ON. |
| • | DTCs P0121, P0122, or P0123 are not set. |
| • | The throttle angle is more than 0 percent when engine speed is less than 1,000 RPM. |
| OR |
| • | The throttle angle is more than 10 percent when engine speed is more than 1,000 RPM. |
Conditions for Setting the DTC
The MAP sensor signal voltage is less than 0.1 volt for more than 7 seconds.
Action Taken When the DTC Sets
| • | The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails. |
| • | The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records. |
Conditions for Clearing the MIL/DTC
| • | The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail. |
| • | A current DTC, Last Test Failed, clears when the diagnostic runs and passes. |
| • | A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic. |
| • | Clear the MIL and the DTC with a scan tool. |
Diagnostic Aids
| • | Inspect the MAP sensor vacuum source for leaks, restrictions or bad connections. |
| • | If an intermittent condition exists, refer to Intermittent Conditions . |
Test Description
The numbers below refer to the step numbers on the diagnostic table.
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The MAP sensor shares the 5-volt reference circuit with other sensors. If DTC P1635 is set, the 5-volt reference circuit is shorted to ground and should be diagnosed first. The short may be on another sensor 5-volt reference circuit.
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Operate the vehicle within the same conditions when the DTC failed. If you cannot duplicate the DTC, the Freeze Frame/Failure Records data can help in locating an intermittent condition.
Step | Action | Values | Yes | No |
|---|---|---|---|---|
Schematic Reference: Engine Controls Schematics | ||||
1 | Did you perform the Diagnostic System Check-Engine Controls? | -- | Go to Step 2 | |
Does the scan tool indicate that DTC P1635 is current? | -- | Go to DTC P1635 | Go to Step 3 | |
3 | With a scan tool observe the MAP sensor voltage. Does the scan tool indicate that the voltage is less than the specified value? | 0.1 V | Go to Step 5 | Go to Step 4 |
Does the DTC fail this ignition? | -- | Go to Step 5 | Go to Diagnostic Aids | |
5 |
Does the voltage measure near the specified value? | 5 V | Go to Step 6 | Go to Step 7 |
6 | Connect a 3-amp fused jumper wire between the 5-volt reference circuit of the MAP sensor and the signal circuit of the MAP sensor. Does the scan tool indicate that the voltage is near the specified value? | 5 V | Go to Step 9 | Go to Step 8 |
7 | Test the 5-volt reference circuit of the MAP sensor for a short to ground or for an open. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 13 | Go to Step 10 |
8 | Test the signal circuit of the MAP sensor for a short to ground or for an open. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 13 | Go to Step 10 |
9 | Inspect for bad connections at the MAP sensor. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 13 | Go to Step 11 |
10 | Inspect for bad connections at the PCM. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 13 | Go to Step 12 |
11 | Replace the MAP sensor. Refer to Manifold Absolute Pressure Sensor Replacement . Did you complete the replacement? | -- | Go to Step 13 | -- |
12 | Replace the PCM. Refer to Powertrain Control Module Replacement . Did you complete the replacement? | -- | Go to Step 13 | -- |
13 |
Does the DTC run and pass? | -- | Go to Step 14 | Go to Step 2 |
14 | With a scan tool, observe the stored information, Capture Info. Does the scan tool display any DTCs that you have not diagnosed? | -- | System OK | |
