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 provide an overview of each diagnostic category.

### DTC Descriptors

DTC P1106: Manifold Absolute Pressure (MAP) Sensor Circuit Intermittent High Voltage
DTC P1107: Manifold Absolute Pressure (MAP) Sensor Circuit Intermittent Low Voltage

### Diagnostic Fault Information

Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance
--- | --- | --- | --- | ---
5-Volt Reference Voltage | P0107, P1107 | P0107, P1107 | P0108, P1106 | P0106
MAP Sensor Signal | P0107, P1107 | P0107, P1107 | P0108, P1106 | P0106
Low Reference | -- | P0107, P1107 | -- | P0106

### 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

#### P1106

• | DTCs P0122, P0123, P1121, and P1122 are not set.

• | The engine run time is greater than 10 seconds.

• | The TP sensor is less than 15 percent while the engine speed is less than 2,500 RPM.

• | 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.

#### P1107

• | DTCs P0122, P0123, P1121, P1122 are not set.

• | The TP sensor is greater than or equal to 0 percent while the engine speed is less than 1,000 RPM.

• | 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 11.5 volts.

• | The DTC runs continuously when the above conditions are met.

### Conditions for Setting the DTC

#### P1106

The ECM detects that the MAP sensor is greater than 103 kPa for 60 seconds intermittently.

#### P1107

The ECM detects the MAP sensor is less than 12 kPa for 60 seconds intermittently.

### Action Taken When the DTC Sets

DTC P1106 and P1107 are Type C DTCs.

### Conditions for Clearing the MIL/DTC

DTC P1106 and P1107 are Type C DTCs.

### Reference Information

#### Schematic Reference

Engine Controls Schematics

#### Connector End View Reference

• | Engine Control Module Connector End Views

• | Engine Controls Connector End Views

#### 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

• | Scan Tool Data List

• | Scan Tool Data Definitions

• | Scan Tool Output Controls

### Circuit/System Verification

1. Verify that DTCs P0107 or P0108 are not set.

⇒ | If any of the DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle .

2. Operate the vehicle within the conditions for running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records. DTC P1106 or P1107 should not set.
3. 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. Start the engine. Observe the manifold absolute pressure (MAP) sensor parameter while moving the harness connector of the sensor. The MAP sensor parameter should not change abruptly.

⇒ | If the MAP sensor parameter changes abruptly, repair the harness connector of the MAP sensor.

2. Engine running, observe the manifold absolute pressure (MAP) sensor parameter while moving the harness connector of the ECM. The MAP sensor parameter should not change abruptly.

⇒ | If the MAP sensor parameter changes abruptly, repair the harness connector of the ECM.

3. Engine running, observe the manifold absolute pressure (MAP) sensor parameter while moving the wiring harness between the sensor and ECM. The MAP sensor parameter should not change abruptly.

⇒ | If the MAP sensor parameter changes abruptly, repair the wiring harness.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• | Manifold Absolute Pressure Sensor Replacement

• | Control Module References for engine control module replacement, setup, and programming