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 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

Component 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

Control Module References for scan tool information

### Circuit/System Verification

1. Engine running, observe the DTC information with a scan tool. DTCs P0107 or P0108 should not set.

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

2. Operate the vehicle within the conditions for running the DTC. DTCs P1106 or P1107 should not set.
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

Engine running, observe the scan tool manifold absolute pressure (MAP) sensor parameter while moving the related wiring harness and harness connectors. The reading should not change abruptly.

⇒ | If the reading changes abruptly, repair the wiring harness and harness connectors.

### 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