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 Descriptor

DTC P0106: Manifold Absolute Pressure (MAP) Sensor Performance

### Diagnostic Fault Information

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

### Typical Scan Tool Data

#### MAP Sensor

Circuit | Short to Ground | Open | Short to Voltage
--- | --- | --- | ---
Operating Conditions: Engine operating in Closed Loop Parameter Normal Range: 32-48 kPa
5-Volt Reference | 10 kPa | 10 kPa | 50 kPa
MAP Sensor Signal | 10 kPa | 10 kPa | 104 kPa
Low Reference | -- | 98 kPa | 104 kPa¹
¹ 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 TP sensor is greater than 28 percent.

### Condition for Running the DTC

• | DTCs P0107, P0108, P0122, P0122, P0123, P0221, P0222, P0223, and P2135 are not set.

• | The engine is running for more than 2 seconds.

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

### Conditions for Setting the DTC

The ECM detects that the actual MAP signal is not within the predicted range.

### Action Taken When the DTC Sets

DTC P0106 is a Type B DTC.

### Conditions for Clearing the MIL/DTC

DTC P0106 is a Type B DTC.

### 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. Ignition ON, observe the scan tool DTC information parameter. DTC P0107, P0108, or P0651 should not be set.

⇒ | If a DTC is set, refer to Diagnostic Trouble Code (DTC) List - Vehicle .

Important: The vehicle used for the comparison is not limited to the same type of vehicle being serviced. A vehicle known to provide an accurate reading is acceptable.

2. Compare the scan tool MAP sensor pressure parameter to the pressure parameter of a known good vehicle. The reading should be within 3 kPa of the known good vehicle.

Important: The Altitude vs Barometric Pressure table indicates a pressure range for a given altitude under normal weather conditions. Weather conditions consisting of very low or very high pressure and/or very low or very high temperature may cause a reading to be slightly out of range.

3. Compare the scan tool MAP sensor pressure parameter to the reading in the Altitude Versus Barometric Pressure table. The MAP sensor pressure parameter should be within the specified range indicated on the table.
4. Start the engine and observe the scan tool MAP sensor pressure parameter. The MAP sensor pressure parameter should change while starting the engine.
5. Engine idling, observe the scan tool MAP sensor parameter. The reading should be between 32-48 kPa.
6. Snap the throttle while observing the scan tool MAP sensor pressure parameter. The MAP sensor pressure parameter should change rapidly when the throttle position changes.
7. 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. Verify none of the following conditions exist:

• | Vacuum leaks or restrictions at the MAP sensor

• | Engine vacuum leaks

• | Leaking exhaust gas recirculation (EGR) valve

• | Restricted exhaust

• | Engine mechanical condition--Refer to Engine Compression Test .

• | Incorrect cam timing--Refer to Timing Belt Inspection and Adjustment for the correct timing.

2. Ignition OFF, disconnect the harness connector at the MAP sensor.
3. Ignition OFF, and the MAIN fuse removed, test for less than 5 ohms of resistance between the low reference circuit 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.

4. Install the MAIN fuse. Ignition ON, install a 3-amp fused jumper wire between the signal circuit and the 5-volt reference circuit. Verify that the scan tool MAP sensor parameter is greater than 102 kPa.

⇒ | If less than the specified range, test the signal circuit and the 5-volt reference circuit for an open/high resistance. If the circuits test normal, replace the ECM.

5. If all circuits test normal, test or replace the MAP sensor.

### Component Testing

1. Ignition OFF, disconnect the harness connector at the MAP sensor.
2. Apply 5 volts and ground to the applicable terminals of the MAP sensor and measure the voltage from the signal circuit of the MAP sensor to ground. Apply the specified vacuum to the MAP sensor.

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

Vacuum Reading | Values
--- | ---
5 in Hg (17 kPa) | 3.12-3.20 Volts
10 in Hg (34 kPa) | 2.38-2.50 Volts
15 in Hg (51 kPa) | 1.65-1.75 Volts
20 in Hg (68 kPa) | 0.94-1.02 Volts

### 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