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 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, P0452, P0532, P0641 | P0106, P0107 | P0107 | P0106, P0108, P0533, P0641, P2229 | P0106, P1101 |
MAP Sensor Signal | P0107 | P0106, P0107 | P0107 | P0106, P0108, P0641 | P0106, P1101 |
Low Reference | -- | P0106, P0108 | P0106, P0108 | -- | P0106, P0108, P1101 |
Typical Scan Tool Data
Circuit | Short to Ground | Open | Short to Voltage |
|---|---|---|---|
Operating Conditions: The ignition is ON, or the engine running. Normal MAP Parameter: 20-48 kPa | |||
5-Volt Reference | 10 kPa | 10 kPa | 104 kPa |
MAP Sensor Signal | 10 kPa | 10 kPa | 104 kPa² |
Low Reference | -- | 90-104¹, ² kPa | -- |
¹Varies, depending on ECM software version ²Internal ECM or sensor damage may occur if the circuit is shorted to B+ | |||
Circuit Description
The manifold absolute pressure (MAP) sensor has a 5-volt reference circuit, a low reference circuit, and a signal circuit. The engine control module (ECM) supplies 5 volts to the MAP sensor on a 5-volt reference circuit, and provides a ground on a low reference circuit. The MAP sensor provides a voltage signal to the ECM on a signal circuit relative to the intake manifold pressure changes.
Conditions for Running the DTC
P0107
| • | DTCs P0120, P0121, P0122, P0123, P0220, P0221, P0222, P0223, P0641, or P0651 are not set. |
| • | The throttle angle is greater than 0 percent when the engine speed is less than 800 RPM. |
| OR |
| • | The throttle angle is greater than 12 percent when the engine speed is greater than 800 RPM. |
| • | This DTC runs continuously when the above conditions are met. |
P0108
| • | DTCs 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 4 minutes at less than -30°C (-22°F) to 2 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 greater than 1,200 RPM. |
| • | This DTC runs continuously when the above conditions are met. |
Conditions for Setting the DTC
P0107
The ECM detects that the MAP sensor voltage is less than 0.10 volt for greater than 5 seconds.
P0108
The ECM detects that the MAP sensor voltage is more than 4.80 volts for greater than 5 seconds.
Action Taken When the DTC Sets
DTCs P0107 and P0108 are Type B DTCs.
Conditions for Clearing the MIL/DTC
DTCs 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
Control Module References for scan tool information
Special Tools
| • | J 23738-A Mityvac |
| • | J 35555 Metal Mityvac |
Circuit/System Verification
- Verify that the following DTCs are not set: P0641 or P0651.
- Ignition ON, observe the scan tool MAP sensor parameters. The readings should be between 0.05-4.9 volts.
- Engine running, observe the DTC information with a scan tool. DTCs P0107 or P0108 should not set.
- Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
| ⇒ | If any of the DTCs are set, refer to DTC P0641 or P0651. |
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the MAP sensor.
- Ignition OFF for 90 seconds, 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 sensor parameter is less than 12 kPa.
- 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 sensor parameter is greater than 4.9 volts.
- 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 ECM. |
| ⇒ | If less than the specified range, test the 5-volt reference circuit for an open/high resistance or a short to ground. If the circuit tests normal, replace the ECM. |
| ⇒ | If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the ECM. |
| ⇒ | If greater than the specified range, test the signal circuit terminal B for a short to voltage. If the circuit tests normal, replace the ECM. |
| ⇒ | If less than the specified range, test the sensor signal circuit for a short to ground, open, high resistance. |
Component Testing
Important: You must perform the Circuit/System Testing before proceeding with the Component Testing.
- Ignition OFF, 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.
- Ignition ON, with the J 23738-A or J 35555 , 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 reading is erratic, replace the MAP sensor. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for ECM replacement, setup, and programming |
