For 1990-2009 cars
Engine Controls Components
TP, MAP, ECT, IAT, Fuel Tank Pressure, and A/C Refrigerant Pressure 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.

• | Engine running.

• | Throttle angle above 5%, if engine speed is above 1000 RPM.

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

### 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:

• | Monitor the MAP sensor using the scan tool. If the MAP sensor does not respond to throttle changes, check the 3X circuits from the ignition control module to the PCM.

| If the 3X signal is lost the PCM will only update the MAP sensor reading once per key cycle, when the engine is first started.

| Depending on where the MAP sensor voltage (high voltage or low voltage) is when the engine is started, the high or low voltage MAP sensor DTC's will set.

• | 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.

• | 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 the DTC P1107 Diagnostic Chart may isolate the cause of the fault.

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

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

1. Ignition ON, engine OFF.
2. With the throttle closed, observe the MAP value displayed on the scan tool Eng 1 data list.

Is MAP value near the specified value?

0.0 volt

Go to Step 4

Go to Step 3

3 |

1. Ignition ON, engine OFF.
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

Go 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. Ignition OFF.
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 Repair Procedures in Electrical Diagnosis section 8A.

Was the 5 volt reference A circuit open or shorted to ground?

--

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 Repair Procedures in Electrical Diagnosis section 8A. Did the terminal require replacement? | -- | Go to Step 12 | Go to Step 11
8 |

1. Ignition OFF.
2. Disconnect the PCM, and check the MAP signal circuit for an open, short to ground, or short to the sensor ground circuit.
3. If the MAP sensor signal circuit is open or shorted to ground, repair it as necessary. Refer to Repair Procedures in Electrical Diagnosis section 8A.

Was the MAP signal circuit open or shorted to ground?

--

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 Repair Procedures in Electrical Diagnosis section 8A. Did the terminal require replacement? | -- | Go to Step 12 | Go to Step 11
10 | Replace the MAP sensor. Is action complete? | -- | Go to Step 12 | --
11 | Replace the PCM. Important: Replacement PCM must be programmed. Refer to PCM Replacement/Programming. Is action complete? | -- | Go to Step 12 | --
12 |

1. Ignition ON, engine OFF, review and record scan tool Fail Records data.
2. Clear DTCs.
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 2

Repair complete