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P0108



DTC P0107 or P0108

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
* Review Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions provide an overview of each diagnostic category.

DTC Descriptors

DTC P0107
- Manifold Absolute Pressure (MAP) Sensor Circuit Low Voltage

DTC P0108
- Manifold Absolute Pressure (MAP) Sensor Circuit High Voltage

Diagnostic Fault Information






Typical Scan Tool Data






Circuit/System Description

The manifold absolute pressure (MAP) sensor responds to pressure changes in the intake manifold. The pressure changes occur based on the engine load. The engine control module (ECM) supplies 5 volts to the MAP sensor on the 5-volt reference circuit. The ECM provides a ground on the low reference circuit. The MAP sensor provides a signal to the ECM on the MAP sensor signal circuit which is relative to the pressure changes in the manifold. The ECM detects a low signal voltage at a low MAP, such as during an idle or a deceleration. The ECM detects a high signal voltage at a high MAP, such as the ignition is ON, with the engine OFF, or at a wide open throttle (WOT). The MAP sensor is also used to determine the barometric pressure (BARO). This occurs when the ignition switch is turned ON, with the engine OFF. The BARO reading may also be updated whenever the throttle position (TP) sensor is greater than 28 percent.

Conditions for Running the DTC

P0107
* DTCs P0122 and P0123 are not set.
* The TP sensor is greater than or equal to 0 percent while the engine speed is less than 1,000 RPM.
OR
* The TP sensor is greater than 5 percent while the engine speed is greater than 1,000 RPM.
* The ignition 1 voltage is greater than 11 volts.
* The DTC runs continuously when the above conditions are met.

P0108
* DTCs P0122 and P0123 are not set.
* The engine has been running for greater than 10 seconds.
* The TP sensor is less than 15 percent while the engine speed is less than 2,500 RPM.
OR
* The TP sensor is less than 35 percent while the engine speed is greater than 2,500 RPM.
* The DTC runs continuously when the above conditions are met.

Conditions for Setting the DTC

P0107

The ECM detects that the MAP is less than 12 kPa for greater than 5 seconds.

P0108

The ECM detects that the MAP is greater than 103 kPa for greater than 5 seconds.

Action Taken When the DTC Sets

* DTC P0107 and P0108 are Type A DTCs.
* The BARO will not be updated.

Conditions for Clearing the DTC

DTC P0107 and P0108 are Type A DTCs.

Diagnostic Aids

* If a shared 5-volt reference circuit is shorted to ground or shorted to a voltage, other 5-volt reference circuits may be affected.
* The scan tool 5 volt reference parameter should display between 4.8-5.2 volts.

Circuit/System Verification

1. Ignition ON, observe the DTC information with a scan tool. Verify DTC P0651 is not set.

• If DTC P0651 is set, Refer to DTC P0641 or P0651. P0641 P0651

2. Turn all accessories OFF.

Important: In extreme cold weather conditions ice may form in the vacuum source to the MAP sensor and may set a DTC. Inspect the MAP sensor and the vacuum source for ice, moisture, or other restrictions.

3. Engine idling, observe the MAP Sensor parameter. The reading should be between 32-48 kPa.
4. If the vehicle passes the Circuit/System Verification test, then operate the vehicle within the conditions for running the DTC. You may also operate the vehicle within the conditions that are captured in the Freeze Frame/Failure Records List.

Circuit/System Testing

1. Ignition OFF, disconnect the vacuum hose at the MAP sensor. Connect the J 23738-A to the vacuum hose.
2. Engine idling, verify that 15-20 in Hg of vacuum is available to the MAP sensor.

• If the vacuum is not within the specified range, repair the restriction in the vacuum hose to the MAP sensor.

3. Ignition OFF, connect the vacuum hose to the MAP sensor. Disconnect the harness connector at the MAP sensor.
4. Ignition ON, test for less than 0.2 volt between the low reference circuit and ground.

• If greater than the specified value, test the low reference circuit for a short to voltage. If the circuit/connections test normal, replace the ECM.

5. Ignition OFF, test for less than 5 ohms of resistance between the low reference circuit and ground.

• If greater than the specified value, test the low reference circuit for an open/high resistance. If the circuit/connections test normal, replace the ECM.

6. Ignition ON, load test for 4.8-5.2 volts between the 5-volt reference circuit and ground.

• If less than the specified range, test the 5-volt reference circuit for a short to ground or open/high resistance. If the circuit/connections test normal, replace the ECM.

• If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit/connections test normal, replace the ECM.

7. Verify that the scan tool MAP sensor pressure parameter is less than 12 kPa.

• If greater than the specified value, test the signal circuit for a short to voltage. If the circuit/connections test normal, replace the ECM.

8. Install a 3A fused jumper wire between the signal circuit and the 5-volt reference circuit. Verify that the MAP sensor parameter is greater than 102 kPa.

• If less than the specified value, test the signal circuit for a short to ground or an open/high resistance. If the circuit/connections test normal, replace the ECM.

9. If all circuits/connections test normal, test or replace the MAP sensor.

Component Testing

1. Ignition OFF, perform one of the following applicable procedures.

* Disconnect the vacuum supply hose from the MAP sensor
* Remove the MAP sensor from the intake manifold

2. Ignition ON, observe and record the scan tool MAP sensor pressure data parameter. This is the first MAP sensor reading.
3. With the J 23738-A apply 5 in Hg (17 kPa) of vacuum to the MAP sensor. Observe and record the scan tool MAP sensor pressure data parameter. This is the second MAP sensor reading.
4. Subtract the second MAP sensor reading from the first MAP sensor reading. Verify that the vacuum decrease is within 1 in Hg (4 kPa) of the applied vacuum.

• If the vacuum decrease is not within the specified range, replace the MAP sensor.

5. With the J 23738-A apply 10 in Hg (34 kPa) of vacuum to the MAP sensor. Observe and record the scan tool MAP sensor pressure data parameter. This is the third MAP sensor reading.
6. Subtract the third MAP sensor reading from the first MAP sensor reading. Verify that the vacuum decrease is within 1 in Hg (4 kPa) of the applied vacuum.

• If the vacuum is not with in the specified range, replace the MAP sensor.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests

* Manifold Absolute Pressure Sensor Replacement
* Programming and Relearning for ECM setup, and programming Programming and Relearning

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