For 1990-2009 cars
Engine Controls Components
Sensors
OBD II Symbol Description Notice
Handling ESD Sensitive Parts Notice
Handling ESD Sensitive Parts Notice

### Circuit Description

The Manifold Absolute Pressure (MAP) sensor responds to changes in intake manifold pressure (vacuum). The MAP sensor signal voltage to the PCM varies from below 2 volts at idle (high vacuum) to above 4 volts with the key ON, engine not running or at wide-open throttle (low vacuum). The MAP sensor is used to determine manifold pressure changes while the EGR flow test diagnostic is being run (refer to DTC P0401), to determine engine vacuum level for some other diagnostics and to determine barometric pressure (BARO). The PCM monitors the MAP signals for voltages outside the normal range of the MAP sensor. If the PCM detects a MAP signal voltage that is excessively low, DTC P0107 will be set.

### Conditions for Setting the DTC

• | No TP sensor DTCs present.

• | The engine is running.

• | Throttle angle above 0%, if engine speed is less than 1000 rpm.

• | Throttle angle above 6%, if engine speed is greater than 1000 rpm.

• | The MAP sensor signal voltage is less than 0.1 volt.

• | Above conditions present for longer than 175 3X reference periods (58 crankshaft revolutions).

### Action Taken When the DTC Sets

• | The PCM will illuminate the malfunction indicator lamp (MIL) during the second consecutive trip in which the diagnostic test has been run and failed.

• | The PCM will store conditions which were present when the DTC set as Freeze Frame and Failure Records data.

### Conditions for Clearing the MIL/DTC

• | The PCM will turn OFF the MIL during the third consecutive trip in which the diagnostic has been run and passed.

• | The History DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction.

• | The DTC can be cleared by using the scan tool.

### Diagnostic Aids

Check for the following conditions:

1. Poor connection at PCM. Inspect harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, and poor terminal to wire connection.
2. Damaged harness. Inspect the wiring harness for damage. If the harness appears to be OK, observe the MAP display on the scan tool while moving connectors and wiring harnesses related to the sensor. A change in the display will indicate the location of the fault.

If DTC P0107 cannot be duplicated, the information included in the Fail Records data can be useful in determining since the DTC was last set. If it is determined that the DTC occurs intermittently, performing DTC P1107 Diagnosis may isolate the cause of the fault.

### Test Description

Number(s) below refer to the step number(s) on the Diagnostic Table:

1. This vehicle is equipped with a PCM which utilizes an Electrically Erasable Programmable Read Only Memory (EEPROM). When the PCM is being replaced, the new PCM must be programmed.

#### DTC P0107 - MAP Sensor Circuit Low Voltage

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 | Was the Powertrain On-Board Diagnostic (OBD) System Check performed? | -- | Go to Step 2 | Go to the Powertrain On Board Diagnostic (OBD) System Check
2 |

1. Turn ON the ignition switch.
2. Observe the MAP value displayed on the scan tool.

Is MAP value near the specified value?

0V

Go to Step 5

Go to Step 4

3 |

1. Turn ON the ignition switch.
2. Review and record scan tool Fail Records data.
3. Operate vehicle within Fail Records conditions as noted.
4. Using a scan tool, monitor Specific DTC info for DTC P0107.

Does scan tool indicate DTC P0107 failed?

--

Go to Step 4

Refer to Diagnostic Aids

4 |

1. Disconnect the MAP sensor electrical connector.
2. Jumper the 5 volt reference A circuit and the MAP signal together at the MAP sensor harness connector.
3. Observe the MAP value displayed on the scan tool.

Is MAP value near the specified value?

4.95V

Go to Step 10

Go to Step 5

5 |

1. Connect a test light between B+ and the MAP sensor signal circuit at the MAP sensor harness connector.
2. Observe the MAP value displayed on the scan tool.

Is MAP value near the specified value?

4.95V

Go to Step 6

Go to Step 8

6 |

1. Turn OFF the ignition switch.
2. Disconnect the PCM and check the 5 volt reference A circuit for an open or short to ground.
3. If the 5 volt reference A circuit is open or shorted to ground, repair it as necessary. Refer to Wiring Repair in Electrical Diagnosis.

Was a problem found?

--

Go to Step 12

Go to Step 7

7 | Check the 5 volt reference A circuit for a poor connection at the PCM and replace terminal if necessary. Refer to Wiring Repair in Electrical Diagnosis. Was a problem found? | -- | Go to Step 12 | Go to Step 11
8 |

1. Turn OFF the ignition switch.
2. Disconnect the PCM.
3. Check the MAP signal circuit for an open, short to ground, or short to the sensor ground circuit.
4. If the MAP sensor signal circuit is open or shorted to ground, repair it as necessary. Refer to Wiring Repair in Electrical Diagnosis.

Was a problem found?

--

Go to Step 12

Go to Step 9

9 | Check the MAP sensor signal circuit for a poor connection at the PCM and replace terminal if necessary. Refer to Wiring Repair in Electrical Diagnosis. Was a problem found | -- | Go to Step 12 | Go to Step 11
10 | Replace the MAP sensor. Go to Manifold Absolute Pressure Sensor Replacement Is action complete? | -- | Go to Step 12 | --
11 | Replace the PCM. Important:: The replacement PCM must be programmed. Go to Powertrain Control Module Replacement/Programming . Is action complete? | -- | Go to Step 12 | --
12 |

1. Turn ON the ignition switch.
2. Review and record scan tool Fail Records data.
3. Clear DTCs.
4. Operate vehicle within Fail Records conditions as noted.
5. Using a scan tool, monitor Specific DTC info for DTC P0107.

Does the scan tool indicate DTC P0107 failed?

--

Go to Step 4

System OK