DTC Descriptors
DTC P0107: Manifold Absolute Pressure (MAP) Sensor Circuit Low VoltageDTC P0108: Manifold Absolute Pressure (MAP) Sensor Circuit High Voltage
Diagnostic Fault Information
Important: Always perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
Circuit | Short to Ground | High Resistance | Open | Short to Voltage | Signal Performance |
|---|---|---|---|---|---|
5-Volt Reference | P0107, P0452, P0532, P0641 | P0106, P0107 | P0107 | P0106, P0108, P0453, P0533, P0641 | P0106, P0107 |
MAP Sensor Signal | P0107 | P0106, P0107 | P0107 | P0108 | P0106, P0107, P1101 |
Low Reference | -- | P0106, P0108 | P0106, P0108 | -- | P0106, P0108 |
Typical Scan Tool Data
Circuit | Normal Range | Short to Ground | Open | Short to Voltage |
|---|---|---|---|---|
5-Volt Reference | -- | 10 kPa | 10 kPa | 104 kPa |
MAP Sensor Signal | 12-103 kPa | 10 kPa | 10 kPa | 104 kPa |
Low Reference | -- | -- | 80-103 kPa | -- |
Circuit Description
The manifold absolute pressure (MAP) 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 includes 3 circuits. The engine control module (ECM) supplies a regulated 5 volts to the sensor on a 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 operated at wide-open throttle (WOT) or when the ignition is on while the engine is off. Under these conditions, the ECM uses the MAP sensor to determine the current BARO. The lowest manifold pressures occur when the vehicle is idling or decelerating. MAP can range from 10 kPa, when pressures are low, to as much as 104 kPa when pressures are high, depending on the BARO. The ECM monitors the MAP sensor signal for pressure outside of the normal range.
Conditions for Running the DTC
P0107
| • | DTCs P0641, P0651, P1516, P1680, P1681, P2101, P2125, P2135, P2138, P2176 are not set. |
| • | The throttle angle is more than 0 percent when the engine speed is less than 1,000 RPM. |
| OR |
| • | The throttle angle is more than 13 percent when the engine speed is more than 1,000 RPM. |
| • | This DTC runs continuously within the enabling conditions. |
P0108
| • | DTCs P0641, P0651, P1516, P1680, P1681, P2101, P2125, P2135, P2138, P2176 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 8 seconds at less than -30°C (-22°F) to 3 seconds at more than 30°C (86°F). |
| • | The throttle angle is less than one percent when the engine speed is less than 1,200 RPM. |
| OR |
| • | The throttle angle is less than 20 percent when the engine speed is more than 1,200 RPM. |
| • | This DTC runs continuously within the enabling conditions. |
Conditions for Setting the DTC
P0107
The ECM detects that the MAP sensor voltage is less than 0.10 volt for more than 4 seconds.
P0108
The ECM detects that the MAP sensor voltage is more than 4.90 volts for more than 4 seconds.
Action Taken When the DTC Sets
| • | The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails. |
| • | The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records. |
Conditions for Clearing the MIL/DTC
| • | The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail. |
| • | A current DTC, Last Test Failed, clears when the diagnostic runs and passes. |
| • | A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic. |
| • | Clear the MIL and the DTC with a scan tool. |
Reference Information
Schematic Reference
Connector End View Reference
Electrical Information Reference
Scan Tool Reference
Circuit/System Verification
| • | 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 |
| - | A restriction in the vacuum source of the MAP sensor |
| • | Use the scan tool and compare the MAP Sensor parameter to a known good vehicle, under various operating conditions. |
| • | Use the scan tool and compare the MAP Sensor parameter at ignition ON, with the engine OFF, to the Altitude vs Barometric Pressure table. Refer to Altitude Versus Barometric Pressure . |
Circuit/System Testing
- Turn ON the ignition, with the engine OFF.
- Disconnect the MAP sensor.
- Connect a test lamp between the MAP sensor 5-volt reference circuit and a good ground.
- Measure for a proper range of 4.8-5.2 volts between the MAP sensor 5-volt reference circuit and a good ground.
- With the MAP sensor still disconnected, use the scan tool to observe the MAP Sensor parameter for the proper value of less than 12 kPa.
- Connect a jumper wire between the MAP sensor 5-volt reference circuit and the MAP sensor signal circuit.
- Use the scan tool to observe the MAP Sensor parameter for the proper value of more than 103 kPa.
- Turn OFF the ignition, and all electrical accessories. Allow sufficient time for all of the control modules to power down before taking a resistance measurement.
- Measure for a proper value of less than 5 ohms of resistance between the low reference circuit of the MAP sensor and a good ground.
- If all of the MAP sensor circuits test normal, then replace the MAP sensor.
Important: The MAP sensor 5-volt reference circuit is spliced to other components of the vehicle.
| ⇒ | If the voltage is less than the specified range, then test the circuit for a high resistance, an open, or a short to ground. If the circuit tests normal, replace the ECM. |
| ⇒ | If the voltage is more than the specified range, then test the circuit for a short to voltage. If the circuit tests normal, replace the ECM. |
| ⇒ | If the MAP Sensor parameter is more than 12 kPa, then test the MAP sensor signal circuit for a short to voltage. If the circuit tests normal, replace the ECM. |
| ⇒ | If the MAP Sensor parameter is less than 103 kPa, then test the MAP sensor signal circuit for a high resistance, an open, or a short to ground. If the circuit tests normal, replace the ECM. |
| ⇒ | If the resistance is more than 5 ohms, then test the circuit for a high resistance. If the MAP sensor low reference circuit tests normal, then replace the ECM. |
Repair Instructions
Important: Always perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for ECM replacement, setup, and programming |
