DTC P0107 Manifold Absolute Pressure (MAP) Sensor Circuit Low Voltage. Buick GL7 (Export) 2000

For 1990-2009 cars

### Circuit Description

The manifold absolute pressure (MAP) sensor responds to changes in intake manifold pressure. The MAP sensor signal voltage to the powertrain control module (PCM) varies from less than 2 volts at idle to more than 4 volts with the key ON and the engine not running or at wide open throttle. . The PCM monitors the MAP signals for voltages outside the normal range of the MAP sensor. If the PCM detects a MAP sensor signal voltage that is excessively low, DTC P0107 will set.

### Conditions for Running the DTC

• | No TP sensor DTCs are present.

• | The system voltage is more than 9 volts.

• | The engine is running.

• | The idle speed is steady.

• | The throttle angle is more than 0 percent, if the engine speed is less than 1000 RPM.

• | The throttle angle is more than 10 percent, if the engine speed is more than 1000 RPM.

### Conditions for Setting the DTC

The MAP sensor signal voltage is less than 12.1 kPa or 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/Failure Records data.

### Conditions for Clearing the MIL/DTC

• | The PCM will turn OFF the malfunction indicator lamp (MIL) during the third consecutive trip in which the diagnostic has 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 a scan tool.

### Diagnostic Aids

Inspect for the following conditions:

• | A poor connection at the PCM. Inspect the harness connectors for the following conditions:

- | Backed-out terminals

- | Improper mating

- | Broken locks

- | Improperly formed or damaged terminals

- | Poor terminal-to-wire connections

• | A 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 the connectors and the wiring harnesses related to the sensor. A change in the display will indicate the location of the malfunction.

If the DTC cannot be duplicated and is determined to be intermittent, reviewing the Failure Records can be useful in determining when the DTC was last set. Also refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

### Test Description

The number below refers to the step number on the diagnostic table.

1. This vehicle is equipped with a PCM which utilizes an electrically erasable programmable read-only memory (EEPROM). If the PCM is replaced, the new PCM must be programmed.

#### P0107- MAP Sensor Circuit Low Voltage

Step | Action | Values | Yes | No
--- | --- | --- | --- | ---
1 | Did you perform the Powertrain On-Board Diagnostic (OBD) System Check? | -- | Go to Step 2 | Go to Powertrain On Board Diagnostic (OBD) System Check

2

Important:: Go to DTC P1635 5 Volt Reference Circuit first, if sets, while the engine is running. Start the engine.

1. Turn ON the ignition, leaving the engine OFF.
2. With the throttle closed, use the scan tool in order to observe the MAP voltage parameter.

Is the MAP voltage less then the specified value?

0.1 V

Go to Step 4

Go to Step 3

3

1. Review and record the scan tool Failure Records data.
2. Operate the vehicle within the Failure Records conditions.
3. Using a scan tool, monitor the Specific DTC info for DTC P0107.

Does the 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 circuit together at the MAP sensor harness connector.
3. Observe the MAP voltage parameter with a scan tool.

Is the MAP voltage near the specified value?

4.95 V

Go to Step 9

Go to Step 5

5

1. Disconnect the jumper wire.
2. Connect a test lamp between B+ and the MAP sensor signal circuit at the MAP sensor harness connector.
3. Observe the MAP voltage parameter on the scan tool.

Is the MAP voltage near the specified value?

4.95 V

Go to Step 6

Go to Step 8

6

1. Turn OFF the ignition.
2. Test the 5 volt reference A circuit of the MAP sensor for high resistance or an open. Refer to Circuit Testing in Wiring Systems.
3. Repair as necessary. Refer to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 13

Go to Step 7

7 | Test the 5 volt reference A circuit of the MAP sensor for a poor connection at the PCM and replace the terminal if necessary. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 13 | Go to Step 12

8

1. Turn OFF the ignition.
2. Test the signal circuit of the MAP sensor for an open, a short to ground, or a short to the sensor ground.
3. Repair as necessary. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 13

Go to Step 10

9

Test the signal circuit and the 5 volt reference circuit of the MAP sensor for a poor connection at the MAP sensor and replace the terminal as necessary. Refer to Testing for Intermittent Conditions and Poor Connections and Repairing Connector Terminals in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 13

Go to Step 11

10

Test the signal circuit and the 5 volt reference circuit of the MAP sensor for a poor connection at the PCM and replace the terminal as necessary. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 13

Go to Step 12

11 | Replace the MAP sensor. Refer to Manifold Absolute Pressure Sensor Replacement . Did you complete the replacement? | -- | Go to Step 13 | --
12 | Important:: The replacement PCM must be programmed. Replace the PCM. Refer to Powertrain Control Module Replacement/Programming . Did you complete the replacement? | -- | Go to Step 13 | --

13

1. Use a scan tool to clear the DTCs.
2. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.

Does the DTC reset?

--

Go to Step 2

System OK