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P0108



DTC P0108

DTC DESCRIPTOR

DTC P0107
Manifold Absolute Pressure (MAP) Sensor Circuit Low Voltage

DTC P0108
Manifold Absolute Pressure (MAP) Sensor Circuit High Voltage

DTC P1106
Manifold Absolute Pressure (MAP) Sensor Circuit Intermittent High Voltage

DTC P1107
Manifold Absolute Pressure (MAP) Sensor Circuit Intermittent Low Voltage

DIAGNOSTIC FAULT INFORMATION

IMPORTANT: Always perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Testing and Inspection






TYPICAL SCAN TOOL DATA

MAP Sensor:






CIRCUIT/SYSTEM DESCRIPTION
The manifold absolute pressure (MAP) sensor responds to pressure changes in the intake manifold. The pressure changes occur based on the engine load. The MAP sensor has the following circuits:
- 5-Volt reference circuit
- Low reference circuit
- MAP sensor signal circuit

The control module supplies 5 volts to the MAP sensor on the 5-Volt reference circuit. The control module also provides a ground on the low reference circuit. The MAP sensor provides a signal to the control module on the MAP sensor signal circuit which is relative to the pressure changes in the manifold. The control module should detect a low signal voltage at a low MAP, such as during an idle or a deceleration. The control module should detect a high signal voltage at a high MAP, such as the ignition is ON, with the engine OFF, or at a wide open throttle (WOT). The MAP sensor is also used in order to determine the barometric pressure (BARO). This occurs 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 control module monitors the MAP sensor signal for voltage outside of the normal range.

CONDITIONS FOR RUNNING THE DTC

P0107 or P1107
- 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 or P1106
- 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.

P1106
- The control module detects that the MAP sensor voltage is intermittently more than 4.3 volts.
- This diagnostic runs continuously.

P1107
- The control module detects that the MAP sensor voltage is intermittently less than 0.1 volt.
- This diagnostic runs continuously.

ACTION TAKEN WHEN DTC P0107 AND P0108 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.

ACTION TAKEN WHEN DTC P1106 AND P1107 SETS
- The control module stores the DTC information into memory when the diagnostic runs and fails.
- The malfunction indicator lamp (MIL) will not illuminate.
- The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Failure Records.
- The driver information center, if equipped, may display a message.

CONDITIONS FOR CLEARING DTC P0107 OR P0108
- 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.

CONDITIONS FOR CLEARING DTC P1106 OR P1107
- 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 non-emission related diagnostic.
- Clear the DTC with a scan tool.

CIRCUIT/SYSTEM TESTING
Always perform the Diagnostic System Check - Vehicle.
1. Start the engine.
2. Monitor the diagnostic trouble code (DTC) information with the scan tool.
3. If DTC P0641 or P0651 is also set then correct DTC P0641 or P0651 first.
4. With the ignition ON, and the engine OFF.
5. Disconnect the manifold absolute pressure (MAP) sensor.
6. Measure for 4.8-5.2 volts from the 5-Volt reference circuit of the MAP sensor to a good ground, with a DMM.
- If more than specified value than test the circuit for a short to voltage or faulty control module.
- If less than specified value than test the circuit for high resistance, an open, or an intermittent and poor connection or at the control module, or a faulty control module.
7. Disconnect the MAP sensor.
8. Use a scan tool and observe the MAP sensor for less than 12 kPa.
- If the MAP sensor is more than 12 kPa then test the MAP sensor signal circuit for a short to voltage or a faulty control module.
9. Use a 3-amp fused jumper wire and connect it between the MAP sensor 5-Volt reference circuit and the MAP sensor signal circuit.
10. Use a scan tool and observe the MAP sensor for more than 103 kPa.
- If the MAP sensor is less than 103 kPa then test the MAP sensor signal circuit for high resistance or a faulty control module.
11. With the 3-amp fused jumper wire still connected between the 5-Volt reference circuit of the MAP sensor and the signal circuit of the MAP sensor. Observe the MAP sensor parameter with the scan tool for 4.9 volts.
- If more than 4.9 volts then replace the MAP sensor.
- If less than 4.9 volts then, test the MAP sensor signal circuit between the control module and the MAP sensor for a short to ground, an open, or high resistance. Test for an intermittent and for a poor connection at the control module, if tests OK then replace the control module.
12. Turn OFF the ignition and allow the control module to power down.
13. With a DMM measure for less than 5 ohms of resistance between the low reference circuit of the MAP sensor and a good ground.
- If the resistance is more than 5 ohms, then test the circuit for a high resistance or a faulty control module.
14. If the MAP sensor circuits test normal, then replace the MAP sensor. Testing and Inspection

REPAIR INSTRUCTIONS

IMPORTANT: Always perform the Diagnostic Repair Verification after completing the diagnostic procedure.
- Manifold Absolute Pressure (MAP) Sensor Replacement
- Powertrain Control Module (PCM) Replacement Verification Tests

REPAIR VERIFICATION
Diagnostic Repair Verification
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