Circuit Description
VIN K
The manifold absolute pressure (MAP) sensor responds to changes in the intake manifold pressure, 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 deceleration, the PCM should detect a low MAP sensor signal voltage. With high manifold absolute pressure, such as ignition ON, engine OFF, or wide-open throttle, the PCM should detect a high MAP sensor signal voltage. This MAP sensor will indicate pressure between 10-104 kPa (1.5-15 psi). The MAP sensor is also used in order to calculate the barometric pressure (BARO) when the ignition switch is turned ON, with the engine OFF. The BARO reading may also be updated whenever the engine is operated at wide-open throttle. The PCM monitors the MAP sensor signal for voltage outside of the normal range. If the PCM detects a MAP sensor signal voltage that is intermittently low DTC P1107 will set.
VIN 1
The manifold absolute pressure (MAP) sensor responds to changes in the intake manifold pressure 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 deceleration, the PCM should detect a low MAP sensor signal voltage. With high manifold absolute pressure, such as during wide-open throttle, the PCM should detect a high MAP sensor signal voltage. This MAP sensor will indicate pressure between 8-208 kPa (1.1-30.1 psi). The MAP sensor is also used in order to calculate the barometric pressure (BARO) when the ignition switch is turned ON, with the engine OFF. The PCM monitors the MAP sensor signal for voltage outside of the normal range. If the PCM detects a MAP sensor signal voltage that is intermittently low, DTC P1107 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. |
| • | 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 20 seconds.
Action Taken When the DTC Sets
| • | The control module stores the DTC information into memory when the diagnostic runs and fails. |
| • | The malfunction indicator lamp (MIL) will not illuminate. |
| • | The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Failure Records. |
| • | The driver information center, if equipped, may display a message. |
Conditions for Clearing the DTC
| • | 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 non-emission related diagnostic. |
| • | Clear the DTC with a scan tool. |
Test Description
The number below refers to the step number on the diagnostic table.
Step | Action | Values | Yes | No | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
Schematic Reference: Engine Controls Schematics | ||||||||||
1 | Did you perform the Diagnostic System Check-Engine Controls? | -- | Go to Step 2 | |||||||
2 |
Does the scan tool indicate that DTC P1635 or P0107 is current? | -- | 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 scan tool indicate that the MAP sensor voltage is less than the specified value and holding? | 0.1 V | Go to Step 5 | Go to Intermittent Conditions | |||||||
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 an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 11 | Go to Step 10 | ||||||
8 | Test the signal circuit of the MAP sensor for a short to ground or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 11 | Go to Step 10 | ||||||
9 | Inspect for poor connections at the MAP sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 11 | Go to Intermittent Conditions | ||||||
10 | Inspect for poor connections at the PCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 11 | Go to Intermittent Conditions | ||||||
11 |
Does the DTC run and pass? | -- | Go to Step 12 | Go to Step 2 | ||||||
12 | With a scan tool, observe the stored information, Capture Info. Does the scan tool display any DTCs that you have not diagnosed? | -- | System OK | |||||||
