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 P0106: Manifold Absolute Pressure (MAP) Sensor Performance
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 | High Resistance | Open | Short to Voltage | Signal Performance
--- | --- | --- | --- | --- | ---
5-Volt Reference | P0107, P0192, P0236, P0335, P0642 | P0106, P0107 | P0107 | P0193, P0236, P0606, P0643, P0690, P2227 | P0641, P0642, P0643
MAP Sensor Signal | P0107 | P0106, P0107 | P0107 | P0106, P0108 | P0106
Low Reference | -- | P0106 | P0098, P0106, P0238 | -- | --

### Typical Scan Tool Data

#### MAP Sensor

Circuit | Short to Ground | Open | Short to Voltage
--- | --- | --- | ---
Parameter Normal Range: Engine running under various operating conditions: 13-240 kPa
5-Volt Reference | 0 kPa | 0 kPa | 0-30 kPa
MAP Sensor Signal | 0 kPa | 0 kPa | 255 kPa
Low Reference | -- | 80-250 kPa | --

### Circuit Description

The manifold absolute pressure (MAP) sensor measures the range of pressures inside the intake manifold. The sensor used on this engine is a three atmosphere sensor. Pressure in the intake manifold is affected by engine speed, throttle opening, turbocharger boost pressure, intake air temperature (IAT), and barometric pressure (BARO). A diaphragm within the MAP sensor is displaced by the pressure changes that occur from the varying load and operating conditions of the engine. The sensor translates this action into electrical resistance. The MAP sensor has the following circuits:

• | A shared and regulated 5-volt reference circuit

• | A shared low reference circuit

• | A MAP sensor signal circuit

The MAP sensor provides a signal voltage to the engine control module (ECM), relative to the pressure changes, on the MAP sensor signal circuit. The ECM converts the signal voltage input to a pressure value.

Under normal operation the greatest pressure that can exist in the intake manifold at ignition ON, engine OFF is equal to the BARO. When the vehicle is operated at wide-open throttle (WOT) the turbocharger can increase the pressure to near 240 kPa. The least manifold pressure occurs when the vehicle is idling or decelerating and can range from 13-42 kPa. The ECM monitors the MAP sensor signal for performance and for pressure outside of the normal range.

### Conditions for Running the DTC

#### P0106 - Engine Cranking

• | DTCs P0096, P0097, P0098, P0099, P0107, P0108, P0121, P0122, P0123, P0221, P0222, P0223, P0236, P0237, P0238, P0455, P0496, P2176, P2227, P2228, P2229 are not set.

• | The engine OFF timer is greater than 4 seconds before cranking begins.

• | The engine is cranking at less than 400 RPM for at least 200 ms.

• | This DTC runs once per key cycle within the enabling conditions.

#### P0106 - Engine Running

• | DTCs P0010, P0011, P0013, P0014, P0107, P0108, P0121, P0122, P0123, P0221, P0222, P0223, P0236, P0237, P0238, P0341, P0342, P0343, P0366, P0367, P0368, P2088, P2089, P2090, P2091, P2227, P2228, P2229 are not set.

• | The engine is running and the ECM has counted greater than 200 RPM.

• | The engine speed is greater than 1,500 RPM once during the drive cycle.

• | If start-up ECT is less than -8°C (+18°F), then the diagnostic is disabled until the ECT reaches 30°C (86°F).

• | The change in the MAP Sensor parameter is greater than 10 kPa once during the drive cycle.

• | The TP Sensor parameter is less than 25 percent once during the drive cycle.

• | This DTC runs continuously within the enabling conditions.

#### P0107

• | The ignition is ON or the engine is running.

• | This DTC runs continuously within the enabling conditions.

#### P0108

• | The ignition is ON or the engine is running.

• | This DTC runs continuously within the enabling conditions.

### Conditions for Setting the DTC

#### P0106 - Engine Cranking

The ECM detects when the engine is cranking that the MAP sensor signal plus a calibrated threshold is not within range of a model derived from the BARO sensor, the MAP sensor, and the boost pressure sensor for more than 2 seconds.

#### P0106 - Engine Running

• | The ECM detects when the engine is running that the MAP sensor signal is less than or greater than a calibrated minimum/maximum threshold for more than 4 seconds continuously or 50 seconds cumulative.

• | The ECM detects when the engine is running that the MAP sensor signal plus a calibrated threshold is not within range of a model derived from the engine speed, throttle position, BARO sensor, and the boost pressure sensor for more than 4 seconds continuously or 50 seconds cumulative.

#### P0107

The ECM detects that the MAP sensor voltage is less than 0.19 volt for more than 4 seconds continuously or 50 seconds cumulative.

#### P0108

The ECM detects that the MAP sensor voltage is greater than 4.80 volts for more than 4 seconds continuously or 50 seconds cumulative.

### Action Taken When the DTC Sets

DTCs P0106, P0107, and P0108 are Type B DTCs.

### Conditions for Clearing the MIL/DTC

DTCs P0106, P0107, and P0108 are Type B DTCs.

### Diagnostic Aids

• | A restriction in the MAP sensor port will cause the sensor to be sluggish or unresponsive.

• | The intercooler is connected to the turbocharger and to the throttle body by flexible ductwork that requires the use of special high torque fastening clamps. Verify that they are properly connected and tightened.

• | The BARO sensor is integrated within the ECM, and it has a port on the housing that allows it to sense the ambient pressure. A buildup of contamination at this opening may hinder the operation of the BARO sensor.

• | A restriction that exists in the exhaust system will hinder the performance of the engine and may cause a DTC P0106 to set. Refer to Restricted Exhaust .

### 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

• | Scan Tool Snapshot Procedure

#### Special Tools

• | J 23738-A Mityvac

• | J 35555 Metal Mityvac

### Circuit/System Verification

Important: Verify that the engine is in good mechanical condition before continuing with this diagnostic.

• | Verify the integrity of the entire air induction system by inspecting for the following conditions:

- | Any damaged components

- | Any hairline fractures of the MAP sensor housing

- | Loose or improper installation

- | An air flow restriction

- | Any vacuum leak

- | Improper routing or connecting of vacuum hoses, including those on the turbocharger bypass valve solenoid and the turbocharger wastegate solenoid

- | In cold climates, inspect for any snow or ice buildup

• | Determine the current vehicle testing altitude. Ignition ON, observe the scan tool MAP Sensor parameter, the Boost Pressure Sensor parameter, and the BARO Sensor parameter. Compare the parameters to each other and to the Altitude versus Barometric Pressure Table. Refer to Altitude Versus Barometric Pressure .

• | Engine running, observe the scan tool and compare the MAP Sensor parameter to a known good turbocharged vehicle, under various operating conditions.

### Circuit/System Testing

1. Ignition OFF, disconnect the MAP harness connector at the MAP sensor.
2. Ignition OFF for 90 seconds, test for less than 5 ohms of resistance between the low reference circuit terminal 2 and ground.

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

3. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal 1 and ground.

⇒ | If less than 4.8 volts, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.

⇒ | If greater than 5.2 volts, 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 parameter is less than 1 kPa.

⇒ | If greater than 1 kPa, test the signal circuit terminal 3 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 3 and the 5-volt reference circuit terminal 1. Verify the scan tool MAP Sensor parameter is greater than 254 kPa.

⇒ | If less than 254 kPa, test the signal circuit terminal 3 for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.

6. If the circuits test normal, test the MAP sensor.

### Component Testing

Important: You must perform the Circuit/System Testing in order to verify the integrity of the MAP sensor circuits before proceeding with the Component Testing.

1. Turn ON the ignition, with the engine OFF, and remove the MAP sensor.
2. Install a 3A fused jumper wire between the 5-volt reference circuit terminal 1 and the corresponding terminal of the MAP sensor.
3. Install a jumper wire between the low reference circuit terminal 2 of the MAP sensor and ground.
4. Install a jumper wire at terminal 3 of the MAP sensor.
5. Connect a DMM between the jumper wire from terminal 3 of the MAP sensor and ground.
6. Install the J 35555 or J 23738-A to the MAP sensor vacuum port. Slowly apply vacuum to the sensor while observing the voltage on the DMM. The voltage should vary between 0-5.2 volts, without any spikes or dropouts.

⇒ | If the voltage is not within the specified range or is erratic, 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