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 Descriptors
DTC P0107: Manifold Absolute Pressure (MAP) Sensor Circuit Low VoltageDTC 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, P0405, P0452, P0462, P0532, P0641 | P0107 | P0107 | P0108, P0453, P0533, P0641 | P0107 |
MAP Sensor Signal | P0107 | P0107 | P0107 | P0108 | P0107 |
Low Reference | -- | P0108 | P0108 | -- | P0108 |
Typical Scan Tool Data
Circuit | Normal Range | Short to Ground | Open | Short to Voltage |
|---|---|---|---|---|
5-Volt Reference | -- | 10 kPa¹ 8 kPa² | 10 kPa¹ 8 kPa² | 104 kPa¹ 200 kPa² |
MAP Sensor Signal | 12-103 kPa¹ 10-198 kPa² | 10 kPa¹ 8 kPa² | 10 kPa¹ 8 kPa² | 104 kPa¹ 200 kPa² |
Low Reference | -- | -- | 80-103 kPa¹ 190 kPa² | -- |
¹ L26 ² L32 | ||||
Circuit/System Description
The manifold absolute pressure (MAP) sensor responds to changes in intake manifold pressure which gives an indication of the engine load. The MAP sensor has a 5-volt reference circuit, a low reference circuit, and a signal circuit. The powertrain control module (PCM) supplies 5 volts to the MAP sensor on the 5-volt reference circuit and provides a ground on the low reference circuit. The MAP sensor provides a signal to the PCM on the MAP sensor signal circuit which is relative to the pressure changes in the manifold.
L26
With low MAP, such as during idle or deceleration, the PCM should detect a low MAP sensor signal voltage. With high MAP, such as ignition ON, engine OFF or wide open throttle (WOT), the PCM should detect a high MAP sensor signal voltage. This MAP sensor will indicate pressure between 12-103 kPa. The MAP sensor is also used in order to calculate the barometric pressure (BARO) when the ignition switch is turned ON, with the engine OFF. The BARO reading may also be updated whenever the engine is operated at WOT. The PCM monitors the MAP sensor signal for voltage outside of the normal range.
L32
With low MAP, such as during idle or deceleration, the PCM should detect a low MAP sensor signal voltage. With high MAP such as WOT, the PCM should detect a high MAP sensor signal voltage. This MAP sensor will indicate pressure between 10-198 kPa. The PCM monitors the MAP sensor signal for voltage outside of the normal range.
Conditions for Running the DTC
P0107
| • | DTCs P0068, P0120, P0220, P1516, P2101, P2108, P2120, P2125, P2135, or P2138 are not set |
| • | The ignition is ON. |
| • | The throttle angle is more than 0 percent, if the engine speed is less than 1,000 RPM. |
| OR |
| • | The throttle angle is more than 10 percent, if the engine speed is more than 1,000 RPM. |
P0108
| • | DTC P0068, P0120, P0220, P1516, P2101, P2108, P2120, P2125, P2135, P2138 are not set. |
| • | The engine has been running for a length of time that is determined by the startup coolant temperature. The length of time ranges from 5.5 minutes at less than -30°C (-22°F) to 10 seconds at more than +30°C (+86°F). |
| • | The throttle angle is less than 2 percent when the engine speed is less than 3,000 RPM. |
| OR |
| • | The throttle angle is more than 30 percent when the engine speed is more than 3,000 RPM. |
Conditions for Setting the DTC
P0107
| • | The control module detects that the MAP sensor voltage is less than 0.1 volt for more than 3 seconds. |
| • | This diagnostic runs continuously. |
P0108
| • | The control module detects that the MAP sensor voltage is more than 4.3 volts for more than 3 seconds. |
| • | This diagnostic runs continuously. |
Action Taken When the DTC Sets
DTC P0107 and P0108 are type B DTCs.
Conditions for Clearing the DTC
DTC P0107 and P0108 are type B DTCs.
Reference Information
Schematic Reference
Connector End View Reference
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Special Tool Reference
J 23738-A Mityvac
Circuit/System Testing
Important: All electrical components and accessories must be turned OFF, and allowed to power down.
- Ignition OFF, disconnect the harness connector at the MAP sensor.
- Ignition OFF, test for less than 5 ohms of resistance between the low reference circuit terminal A and ground.
- Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal C and ground.
- Verify the scan tool MAP parameter is less than 12 kPa (L26), 10 kPa (L32).
- Install a 3A fused jumper wire between the signal circuit terminal B and the 5-volt reference circuit terminal C. Verify the scan tool MAP parameter is greater than 103 kPa (L26), 199 kPa (L32).
- If all circuits test normal, test or replace the MAP sensor.
| ⇒ | If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the PCM. |
| ⇒ | If less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the PCM. |
| ⇒ | If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the PCM. |
| ⇒ | If greater than the specified range, test the signal circuit terminal B for a short to voltage. If the circuit tests normal, replace the PCM. |
| ⇒ | If less than the specified range, test the signal circuit for short to ground or an open/high resistance. If the circuit tests normal, replace the PCM. |
Component Testing
- Turn ON the ignition, with the engine OFF, and remove the MAP sensor.
- Install a 3A fused jumper wire between the 5-volt reference circuit terminal C and the corresponding terminal of the MAP sensor.
- Install a jumper wire between the low reference circuit terminal A of the MAP sensor and ground.
- Install a jumper wire at terminal B of the MAP sensor.
- Connect a DMM between the jumper wire from terminal B of the MAP sensor and ground.
- Install the 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.
