DTC P0107 or P0108. Chevrolet Joy 2008

For 1990-2009 cars

### Diagnostic Instructions

• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

• | Review Strategy Based Diagnosis for an overview of the diagnostic approach.

• | Diagnostic Procedure Instructions provides 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

Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance
--- | --- | --- | --- | ---
5-Volt Reference | P0107, P0404 | P0107 | P0108 | --
MAP Sensor Signal | P0107 | P0107 | P0108 | --
Low Reference | -- | P0108 | -- | --

### Typical Scan Tool Data

#### MAP Sensor

Circuit | Short to Ground | Open | Short to Voltage
--- | --- | --- | ---
Operating Conditions: Engine operating in Closed Loop. Parameter Normal Range: 45-55 kPa
5-Volt Reference | 50 kPa, | 50 kPa, | 121 kPa,
MAP Sensor Signal | 50 kPa, | 50 kPa, | 121 kPa,
Low Reference | -- | 113 kPa, | 121 kPa*,
* Internal ECM damage may occur if the circuit is shorted to B+

### 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 engine is operated at or near WOT.

### Conditions for Running the DTC

#### P0107 Conditions 1

• | DTCs P0335, P0336, and P0337 are not set.

• | The ignition is ON, with the engine OFF for more than 1 seconds.

• | DTC P0107 runs continuously once the above conditions are met.

#### P0107 Conditions 2

• | DTCs P0122, P0123, P0222, P0223, and P0510 are not set.

• | The engine is running.

• | The engine speed is less than 1,216 RPM.

• | DTC P0107 runs continuously once the above conditions are met.

#### P0107 Conditions 3

• | DTCs P0122, P0123, P0222, P0223, and P0510 are not set.

• | The ignition is ON.

• | The engine speed is less than 118 RPM.

• | The throttle position (TP) sensor angle is more than 30 degrees.

• | DTC P0107 runs continuously once the above conditions are met.

#### P0108

• | DTCs P0122, P0123, P0222, P0223, and P0510 are not set.

• | The engine is running for more than 5 seconds.

• | The engine speed is between 1,216-3,008 RPM.

• | DTC P0108 runs continuously once the above conditions are met.

### Conditions for Setting the DTC

#### P0107

The ECM detects that the MAP sensor is less than 15 kPa.

#### P0108

The ECM detects that the MAP sensor is more than 95 kPa.

### Action Taken When the DTC Sets

DTC P0107 and P0108 are Type A DTCs.

### Conditions for Clearing the MIL/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.

### Reference Information

#### Schematic Reference

Engine Controls Schematics

#### Electrical Information Reference

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

#### DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

#### Scan Tool Reference

Control Module References for scan tool information

#### Special Tools Required

J 23738-A Mityvac

### Circuit/System Verification

1. Engine running, increase the engine speed to 2,000 RPM. Verify the scan tool MAP Sensor pressure parameter is between 30-40 kPa.
2. Cycle the throttle from idle to 2,000 RPM while observing the scan tool MAP sensor pressure parameter. The MAP sensor pressure parameter should change. Repeat the procedure as necessary.
3. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

### Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the MAP sensor.
2. Ignition OFF, test for less than 5 ohms of resistance between the low reference circuit terminal A and ground.

⇒ | If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.

Important: The 5-volt reference circuits are internally and externally connected at the ECM. Other component DTCs may be set. If other DTCs are set, review the electrical schematic and diagnose the applicable circuits and components.

3. Ignition On, test for 4.8-5.2 volts between the 5-volt reference circuit terminal C 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 tests normal, replace the ECM.

⇒ | If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the ECM.

4. Verify the scan tool MAP sensor pressure parameter is at 50 kPa.

⇒ | If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the ECM.

5. Install a 3A fused jumper wire between the signal circuit terminal B and the 5-volt reference circuit terminal C. Verify the scan tool MAP sensor pressure parameter is greater than 50 kPa.

⇒ | If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.

6. If all circuits 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 the vacuum decrease is within 1 in Hg (4 kPa) of the applied vacuum.

⇒ | If 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 the vacuum decrease is within 1 in Hg (4 kPa) of the applied vacuum.

⇒ | If not with in the specified range, replace the MAP sensor.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• | Manifold Absolute Pressure Sensor Replacement

• | Control Module References for ECM replacement, setup, and programming