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Home >> Hummer >> 2006 >> H1 V8-6.6L DSL Turbo >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> P Code Charts >> P0106

P0106



DTC P0106

DTC DESCRIPTOR

DTC P0106
DTC P0106 Manifold Absolute Pressure (MAP) Sensor Performance

DIAGNOSTIC FAULT INFORMATION






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

TYPICAL SCAN TOOL DATA

MAF Sensor:






CIRCUIT/SYSTEM DESCRIPTION
The manifold absolute pressure (MAP) sensor measures the pressure inside the intake manifold. Pressure in the intake manifold is affected by turbocharger output, engine speed, accelerator pedal input, air temperature, and barometric pressure (BARO). A diaphragm within the MAP sensor is displaced by the pressure changes that occur from the varying load and operating conditions of the engine. The engine control module (ECM) supplies a regulated 5 volts to the sensor on a 5-volt reference circuit. The ECM supplies a ground on a low reference circuit. The MAP sensor provides a signal voltage to the ECM, relative to the pressure changes, on the MAP sensor signal circuit. The ECM converts the signal voltage input to a pressure value. Under normal operation, the lowest pressure that can exist in the intake manifold is equal to the BARO. This occurs when the vehicle is operating at idle or when the ignition is ON, while the engine is OFF. The ECM uses the MAP sensor to aid in diagnosis of the turbocharger performance. The highest manifold pressures occur when the turbocharger output is high. Manifold pressure can range from 58 kPa (8 psi) when pressure are low, to more than 240 kPa (34 psi) when pressures are high, depending on the BARO. The MAP sensor has a range of 33-255 kPa (4-36 psi).

CONDITIONS FOR RUNNING THE DTC
- DTCs P0107, P0108, P2228, or P2229 are not set.
- The engine speed is less than 900 RPM.
- This DTC runs continuously within the enabling conditions.

CONDITIONS FOR SETTING THE DTC
The ECM detects that the BARO and MAP sensors disagree by more than 14 kPa with the ignition ON, for more than 10 seconds.

ACTION TAKEN WHEN THE DTC SETS
- The control module illuminates the malfunction indicator lamp (MIL) when the diagnostic runs and fails.
- The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Freeze Frame/Failure Records.

CONDITIONS FOR CLEARING THE MIL/DTC
- 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.

SPECIAL TOOLS REQUIRED
J 35616-200 Test Lamp Kit

CIRCUIT/SYSTEM VERIFICATION

IMPORTANT: Verify that the engine is in good mechanical condition before continuing with this diagnostic.

1. If DTCs P0698 or P0699 are set, diagnose those codes first. Refer to Diagnostic Trouble Code (DTC) List - Vehicle.
2. With the ignition ON, use a scan tool to observe the MAP and BARO parameters. Verify the MAP and BARO sensor parameters are within 5 kPa of each other.

IMPORTANT: If you cannot duplicate the condition, 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.

3. With the engine running, slowly increase the engine speed from idle to 2,000 RPM, then allow the engine speed to return idle. The MAP sensor parameter should increment to a higher value at 2,000 RPM and return near BARO at idle speed.
4. Verify the integrity of the air induction system by inspecting for the following conditions:
- Damaged components
- Loose or improper installation
- An air flow restriction
5. Verify that any electrical aftermarket devices are properly connected and grounded. Refer to Checking Aftermarket Accessories.

CIRCUIT/SYSTEM TESTING
1. With the ignition ON, the engine OFF, and the manifold absolute pressure (MAP) sensor disconnected, connect a test lamp between the MAP sensor 5-volt reference circuit and a good ground.

IMPORTANT: Use the J 35616-200 for this test. If the J 35616-200 is not available, use a test lamp that measures more than 20 ohms.

2. With a DMM, measure the voltage from the probe end of the test lamp to a good ground, for a range of 4.8-5.2 volts.
- If the voltage is less than the specified range, then test the circuit for the following:
- An Open
- High resistance
- A faulty control module
- If the voltage is more than the specified range, then test the circuit for the following:
- A short to voltage
- A faulty control module
3. With the MAP sensor disconnected, use the scan tool to observe the MAP Sensor parameter for a value of less than 45 kPa.
- If the MAP Sensor parameter is more than 45 kPa, then test the MAP sensor signal circuit for the following conditions:
- A short to 5-volt reference
- A short battery voltage
- A faulty control module
4. With the MAP sensor disconnected, connect a fused jumper wire between the MAP sensor 5-volt reference circuit and the MAP sensor signal circuit. Observe the MAP Sensor parameter for the a value of more than 253 kPa.
- If the MAP Sensor parameter is less than 253 kPa, then test the MAP sensor signal circuit for the following:
- High resistance
- A faulty control module
5. With the ignition OFF, and all electrical accessories OFF, allow sufficient time for the control module to power down. Measure the resistance between the low reference circuit of the MAP sensor connector and a good ground, for a value of less than 5 ohms of resistance.
- If the resistance is more than 5 ohms, then test the low reference circuit for the following:
- High resistance
- A faulty control module
- If all circuits test OK, replace the MAP sensor.

REPAIR INSTRUCTIONS

IMPORTANT:
- Always perform the Diagnostic Repair Verification after completing the diagnostic procedure.
- Always perform the Turbocharger Learn Procedure. Refer to Turbocharger Learn Procedure then review the DTC information with a scan tool.
- Manifold Absolute Pressure (MAP) Sensor Replacement
- Control Module References for ECM replacement, setup, and programming

REPAIR VERIFICATION

IMPORTANT: Always perform the Turbocharger Learn Procedure. Review the DTC information with a scan tool.

1. With the engine running at idle, observe the MAP and BARO parameters with a scan tool. The MAP and BARO sensor parameters should be within 5 kPa of each other.
2. With a scan tool, command the turbocharger vane pos. ctrl. solenoid valve ON. Slowly increase the engine speed from idle to 2,000 RPM and return the engine to idle speed.
- The MAP sensor parameter should increment to a higher value and return to the BARO value.
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