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 | High Resistance | Open | Short to Voltage | Signal Performance
--- | --- | --- | --- | --- | ---
5-Volt Reference | P0107, P0452, P0532, P0641 | P0106, P0107 | P0107 | P0106, P0108, P0533, P0641, P2229 | P0106, P1101
Manifold Absolute Pressure Sensor Signal | P0107 | P0106, P0107 | P0107 | P0108 | P0106, P1101
Low Reference | -- | P0106, P0108 | P0106, P0108 | -- | P0106, P1101

### Typical Scan Tool Data

#### MAP Sensor

Circuit | Short to Ground | Open | Short to Voltage
--- | --- | --- | ---
Operating Conditions: With the engine running, turn the ignition ON Parameter Normal Range: 12-103 kPa
5-Volt Reference | 10 kPa | 10 kPa | 104 kPa
Manifold Absolute Pressure Sensor Signal | 10 kPa | 10 kPa | 104 kPa
Low Reference | -- | 90-104¹ kPa | --
¹Variation according to the ECM version

#### MAP Sensor, Volts

Circuit | Short to Ground | Open | Short to Voltage
--- | --- | --- | ---
Operating Conditions: With the engine running, turn the ignition ON Parameter Normal Range: 12-103 kPa
5-Volt Reference | 0.0 V | 0.0 V | 4.98 V
Manifold Absolute Pressure Sensor Signal | 0.0 V | 0.0 V | 4.98 V
Low Reference | -- | 4.5-4.98¹ V | --
¹Variation according to the ECM version

### Circuit Description

The manifold absolute pressure sensor measures the pressure inside the intake manifold. Pressure in the intake manifold is affected by engine speed, throttle opening, air temperature 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 wiring harness includes 3 circuits. The engine control module (ECM) supplies a regulated 5-volt to the sensor on the 5-volt reference circuit. The ECM supplies a ground on a low reference circuit. The MAP sensor provides a signal voltage to the 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 highest pressure that can exist in the intake manifold is equal to BARO. This occurs when the vehicle is at wide-open throttle (WOT) or when the ignition is ON while the engine is not running. Under these conditions, the ECM uses the MAP sensor in order to determine the current BARO. The lowest manifold pressures occur when the vehicle is idling or decelerating. MAP reaches to 8-10 kPa the least and 103 kPa highest according to BARO pressure. The ECM monitors the MAP sensor signal for pressure outside of the normal range.

### Conditions for Running the DTC

#### P0107-Ignition Start Test

The engine speed is less than 400 RPM.

#### P0107-Running Test

• | DTC P0120, P0121, P0122, P0123, P0220, P0221, P0222, P0223, P0641, or P0651 are not set.

• | The throttle angle is more than 0 percent when the engine speed is less than 800 RPM.

| OR

• | The throttle angle is more than 12.5 percent when the engine speed is more than 800 RPM.

• | The DTCs run continuously when the conditions are met.

#### P0108

• | DTC P0120, P0121, P0122, P0123, P0220, P0221, P0222, P0223, P0641, or P0651 are not set.

• | The engine has been running for a period of time that is determined by the start-up engine coolant temperature (ECT). The time ranges from 242 seconds at less than -30°C ( -22°F), 188 seconds at -15°C (5°F), 144 seconds at 0°C (32°F), 80 seconds at 15°C (59°F) to more than 0 seconds at 30°C (86°F).

• | The throttle angle is less than 1 percent when the engine speed is less than 1,200 RPM.

• | The throttle angle is less than 20 percent when the engine speed is more than 1,200 RPM.

• | The DTCs run continuously once the conditions are met.

### Conditions for Setting the DTC

#### P0107

• | The ECM detects the MAP sensor voltage is less than 0.10 volt.

• | It occurs 320 times during the 400 tests.

• | DTC P0107 sets when the above conditions are met.

#### P0108

• | The ECM detects that the MAP sensor voltage is more than 4.90 volts.

• | It occurs 320 times during the 400 tests.

• | DTC P0108 set when the above conditions are met.

### Action Taken When the DTC Sets

DTCs P0107 and P0108 are Type B DTCs.

### Conditions for Clearing the DTC

DTCs P0107 and P0108 are Type B DTCs.

### Reference Information

#### Schematic Reference

Engine Controls Schematics

#### Connector End View Reference

• | Engine Controls Connector End Views

• | Engine Control Module Connector End Views

#### Electrical Information Reference

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

#### DTC Type Reference

Diagnostic Trouble Code (DTC) Type Definitions

#### Scan Tool Reference

• | Scan Tool Data List

• | Scan Tool Data Definitions

• | Engine Control Module Scan Tool Information

### Circuit/System Verification

1. Verify the integrity of the MAP sensor system by inspecting for the following conditions:

• | Any damage to the MAP sensor housing

• | Any damage to the MAP sensor seal

• | A loose or improperly installed MAP sensor

• | Restrictions in the MAP sensor vacuum source

2. Turn the ignition ON, observe the scan tool MAP sensor parameters. The readings should be within 5 kPa of the current BARO for your location. Refer to Altitude Versus Barometric Pressure .

### Circuit/System Testing

1. Turn the ignition OFF, disconnect the harness connector at the MAP sensor.
2. Turn the ignition OFF, allow sufficient time for the control module to power down. Measure for less than 5 ohms between the low reference circuit terminal A of the connector and a good ground.

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

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 an open/high resistance or short to ground. If the circuit tests normal, replace the ECM.

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

4. Verify the scan tool MAP sensor voltage parameter is less than 0.2 volt.

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

5. Connect a 3-amp fused jumper wire between the signal circuit terminal B and the 5-volt reference circuit terminal C. Verify that the scan tool MAP sensor parameter is more than 4.9 volts.

⇒ | If less than the specified range, test the sensor signal circuit for short to ground, or an open or high resistance.

6. If all circuits test normal, test or 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