Operation CHARM: Car repair manuals for everyone.
Home >> Cadillac >> 2007 >> DTS V8-4.6L >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> P Code Charts >> P0106

P0106



DTC P0106

Diagnostic Instructions

* Perform The Diagnostic System Check - Vehicle Initial Inspection and Diagnostic Overview
* Strategy Based Diagnosis
* Diagnostic Procedure Instructions

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

Diagnostic Fault Information






Typical Scan Tool Data






Circuit Description

The intake flow rationality diagnostic provides the within-range rationality check for the mass air flow (MAF), manifold absolute pressure (MAP), and the throttle position (TP) sensors. This is an explicit model-based diagnostic containing 4 separate models for the intake system.

* The throttle model describes the flow through the throttle body and is used to estimate the MAF through the throttle body as a function of barometric pressure (BARO), TP, intake air temperature (IAT), and estimated MAP. The information from this model is displayed on the scan tool as the MAF Performance Test parameter.
* The first intake manifold model describes the intake manifold and is used to estimate MAP as a function of the MAF into the manifold from the throttle body and the MAF out of the manifold caused by engine pumping. The flow into the manifold from the throttle uses the MAF estimate calculated from the above throttle model. The information from this model is displayed on the scan tool as the MAP Performance Test 1 parameter.
* The second intake manifold model is identical to the first intake manifold model except that the MAF sensor measurement is used instead of the throttle model estimate for the throttle air input. The information from this model is displayed on the scan tool as the MAP Performance Test 2 parameter.
* The fourth model is created from the combination and additional calculations of the throttle model and the first intake manifold model. The information from this model is displayed on the scan tool as the TP Performance Test parameter.

The estimates of MAF and MAP obtained from this system of models and calculations are then compared to the actual measured values from the MAF, MAP, and the TP sensors and to each other to determine the appropriate DTC to fail. The following table illustrates the possible failure combinations and the resulting DTC or DTCs.






Conditions for Running the DTC

* DTCs P0102, P0103, P0107, P0108, P0112, P0113, P0117, P0116, P0118, P0128, P0335, P0336, P0401, P0405, P1404 are not set.
* The engine speed is between 500-5,000 RPM.
* The IAT Sensor parameter is between -7 and +60°C (+19 and +140°F).
* The ECT Sensor parameter is between 70-129°C (158-264°F).
* This DTC runs continuously within the enabling conditions.

Conditions for Setting the DTC

The engine control module (ECM) detects that the MAP sensor pressure is not within range of the calculated pressure that is derived from the system of models for more than 0.5 second.

Action Taken When the DTC Sets

DTC P0106 is a Type B DTC.

Conditions for Clearing the MIL/DTC

DTC P0106 is a Type B DTC.

Diagnostic Aids

1. A skewed or stuck engine coolant temperature (ECT) or IAT will cause the calculated models to be inaccurate and may cause this DTC to run when it should not. Refer to Temperature Versus Resistance.
2. A skewed MAP sensor will also cause the first and second intake manifold models to disagree with the actual MAP sensor measurements. Use a scan tool and compare the MAP Sensor parameter to a known good vehicle under various operating conditions.

Circuit/System Verification

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

1. If DTC P0641 or P0651 is set, refer to Diagnostic Trouble Code (DTC) List - Vehicle. Diagnostic Trouble Code Descriptions
2. Verify the integrity of the entire air induction system by inspecting for the following conditions:

* Any damaged components
* Loose or improper installation
* An air flow restriction
* Any vacuum leak
* Improperly routed vacuum hoses
* In cold climates, inspect for any snow or ice buildup

3. Verify there are no restrictions in the MAP sensor port or vacuum source.
4. Verify there are no restrictions in the exhaust system. Refer to Restricted Exhaust. Restricted Exhaust
5. The barometric pressure (BARO) that is used by the ECM to calculate the air flow models is initially based on the MAP sensor at ignition ON. When the engine is running, the ECM will continually update the BARO value near wide open throttle (WOT) using the MAP sensor and a calculation. A skewed MAP sensor will cause the BARO value to be inaccurate.
6. Determine the current vehicle testing altitude.
7. Ignition ON, observe the scan tool BARO Sensor parameter. Compare the parameter to the Altitude vs Barometric Pressure table. Refer to Altitude Versus Barometric Pressure.

Circuit/System Testing

1. Ignition OFF, disconnect the MAP sensor harness connector at the MAP sensor.
2. Ignition OFF, allow at least 60 seconds for the control module to power down.
3. Test for less than 5 ohms of resistance between the low reference circuit terminal A and ground.

• If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.

4. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal C and ground.

• If less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.
• If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the ECM.

5. Verify the scan tool MAP Sensor parameter is less than 12 kPa.

• If greater than the specified range, test the signal circuit terminal B for a short to voltage. If the circuit tests normal, replace the ECM.

6. Install a 3-amp fused Jumper wire between the signal circuit terminal B and the 5-volt reference circuit terminal C. Verify the scan tool MAP Sensor parameter is greater than 103 kPa.

• If less than the specified range, test the signal circuit terminal B for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.

7. If all circuits test normal, test the MAP sensor. Refer to Component Testing for instructions.

Component Testing

Important: You must perform the Circuit/Testing in order to verify the integrity of the MAP sensor circuits before proceeding with the Component Testing.

1. Ignition ON, remove the MAP sensor.
2. Install a 3A fused Jumper wire between the 5-volt reference circuit terminal C and the corresponding terminal of the MAP sensor.
3. Install a Jumper wire between the low reference terminal A of the MAP sensor and ground.
4. Install a Jumper wire at terminal B of the MAP sensor.
5. Connect a DMM between the Jumper wire from the terminal B of the MAP sensor and ground.
6. Install a J 35555 to the MAP sensor vacuum port. Slowly apply vacuum to the sensor while observing the voltage on the DMM. The voltage should vary between 0-5.2 volts without any spikes or dropouts.

• If the voltage is not within the specified range or is erratic, replace the MAP sensor.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests

* Manifold Absolute Pressure Sensor Replacement
* Control Module References for ECM replacement, setup, and programming Programming and Relearning

pro multis · About Operation CHARM