PRE-RELEASE
DTC P0106 (LF1, LFW )
| DTC P0106 (LF1, LFW ) |
| Diagnostic Instructions |
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Perform the
Diagnostic System Check - Vehicle
prior to using this diagnostic procedure.
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Review
Strategy Based Diagnosis
for an overview of the diagnostic approach.
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Diagnostic Procedure Instructions
provides an overview of each diagnostic category.
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| DTC Descriptor |
DTC P0106
Manifold Absolute Pressure (MAP) Sensor Performance
| Diagnostic Fault Information |
| Circuit | Short to Ground | High Resistance | Open | Short to Voltage | Signal Performance |
| 5 V Reference | P0107, P0641 | P0106, P0697 | P0107 | P0106, P0697 | P0106, P0107 |
| MAP Sensor Signal | P0107 | P0106, P0107 | P0107 | P0108 | P0106, P0107, P1101 |
| Low Reference | - | P0106, P0108 | P0106, P0108 | - | P0106, P0108 |
| Typical Scan Tool Data |
MAP Sensor
| Circuit | Short to Ground | Open | Short to Voltage |
| Operating conditions: Engine running, transmission in Park or Neutral Parameter Normal Range: 20-48 kPa (2.9-7 psi), varies with altitude | |||
| 5 V Reference | 0 kPa (0 psi) | 0 kPa (0 psi) | 127 kPa (18.4 psi) |
| MAP Sensor Signal | 0 kPa (0 psi) | 0 kPa (0 psi) | 127 kPa (18.4 psi) |
| Low Reference | - | 127 kPa (18.4 psi) | - |
| 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 sensors. This is an explicit model-based diagnostic containing 4 separate models for the intake system.
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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), throttle position, intake air temperature (IAT), and estimated MAP. The information from this model is displayed on the scan tool as the MAF Performance Test parameter.
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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.
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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.
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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 Throttle Position Performance Test parameter.
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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 throttle position 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.
Scan Tool Diagnostic Test Results
| MAF Performance Test | MAP Performance Test 1 | MAP Performance Test 2 | Throttle Position Performance Test | DTCs Passed | DTCs Failed |
| - | - | OK | OK | P0101, P0106, P0121, P1101 | None |
| OK | OK | Malfunction | OK | P0101, P0106, P0121, P1101 | None |
| Malfunction | OK | Malfunction | OK | P0106, P0121, P1101 | P0101 |
| OK | Malfunction | Malfunction | OK | P0101, P0121, P1101 | P0106 |
| Malfunction | Malfunction | Malfunction | OK | P0121, P1101 | P0101, P0106 |
| - | - | OK | Malfunction | P0101, P0106, P1101 | P0121 |
| OK | OK | Malfunction | Malfunction | P0101, P0106, P0121, P1101 | None |
| Malfunction | OK | Malfunction | Malfunction | P0101, P0106, P0121 | P1101 |
| - | Malfunction | Malfunction | Malfunction | P0101, P0106, P0121 | P1101 |
| Conditions for Running the DTC |
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DTC P0102, P0103, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0128, P0335 or P0336 is not set.
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The engine speed is between 400-7,000 RPM.
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The IAT Sensor parameter is between -20° to +125°C (-4° to +257°F).
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The ECT Sensor parameter is between 69-127°C (156-260°F).
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This DTC runs continuously within the enabling conditions.
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| Conditions for Setting the DTCs |
The engine control module (ECM) detects that the actual measured airflow from MAF, MAP, and throttle position is not within range of the calculated airflow that is derived from the system of models for more than 2 s.
| 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 |
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A wide open throttle (WOT) acceleration from a stop should cause the MAP sensor parameter on the scan tool to increase rapidly to near the BARO parameter at the time of the 1-2 shift.
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The 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 WOT using the MAP sensor and a calculation. A skewed MAP sensor will cause the BARO value to be inaccurate.
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| Reference Information |
Schematic Reference
Engine Controls Schematics (3.0L (LF1)) Engine Controls Schematics (2.8L (LAU))
Connector End View Reference
Component Connector End Views
Electrical Information Reference
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Circuit Testing
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Connector Repairs
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Testing for Intermittent Conditions and Poor Connections
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Wiring Repairs
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DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Special Tools
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J 23738-A
Mityvac
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J 35555
Metal Mityvac
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For equivalent regional tools, refer to
Special Tools
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| Circuit/System Verification |
| 1. |
Verify that DTC P0641, P0651, or P0697 is not set.
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| 2. |
If any of the DTCs are set, refer to
DTC P0641, P0651, P0697, or P06A3 (ECM, LF1)
.
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| 3. |
Verify that restrictions do not exist in the exhaust system. Refer to
Restricted Exhaust
.
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| 4. |
Ignition OFF for 90 s, determine the current vehicle testing altitude.
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| 5. |
With the ignition ON and the engine OFF, check the scan tool's BARO parameter. Compare the parameter to the table
Altitude versus barometric pressure
. The BARO parameter should be within the specified range indicated in the table.
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Use the scan tool and compare the MAP Sensor parameter to a known good vehicle, under various operating conditions. The reading should be within 5 kPa of the known good vehicle.
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| 7. |
Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
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| Circuit/System Testing |
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Verify the integrity of the entire air induction system by inspecting for the following conditions:
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Any damaged components
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Loose or improper installation
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An air flow restriction
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Any vacuum leak
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Improperly routed vacuum hoses
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In cold climates, inspect for any snow or ice buildup
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Verify that restrictions do not exist in the MAP sensor port or vacuum source.
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Ignition OFF for 90 s, disconnect the harness connector at the B74 MAP sensor.
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| 3. |
Ignition OFF, test for less than 5 Ω between the low reference circuit terminal 2 and ground.
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If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K20 ECM.
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Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal 1 and ground.
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If less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 ECM.
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If greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.
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Verify the scan tool MAP Sensor parameter is less than 1 kPa (0.2 psi).
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If greater than the specified range, test the signal circuit's pin 3 for a short to voltage. If the circuit tests normal, replace the K20 ECM.
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Install a 3 A fused jumper wire between the signal circuit terminal 3 and the 5 V reference circuit terminal 1. Verify the scan tool MAP Sensor parameter is greater than 127 kPa (18.4 psi).
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If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 ECM.
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| 12. |
If the circuits test normal, test or replace the B74 MAP sensor.
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| Component Testing |
| Note | ||
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You must perform the Circuit/System Testing in order to verify the integrity of the MAP sensor circuits before proceeding with the Component Testing. |
Skewed Signal Test
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Using the following steps and referencing the table below will determine if the MAP sensor is skewed.
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| 2. |
Ignition ON, engine OFF, observe the MAP Sensor scan tool parameter.
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Use the observed MAP Sensor scan tool parameter that is closest to a value that is indicated in the first column.
THEN |
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| 4. |
Using the
J 23738-A
Mityvac or the
J 35555
Metal Mityvac, apply 5 Hg of vacuum to the B74 MAP sensor, the parameter in the first column should decrease by 17 kPa (2.5 psi). The acceptable range is specified in the second column.
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Using the
J 23738-A
Mityvac or the
J 35555
Metal Mityvac, apply 10 Hg of vacuum to the B74 MAP sensor, the parameter in the first column should decrease by 34 kPa (4.9 psi). The acceptable range is specified in the third column.
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| Ignition ON, Engine OFF, MAP Sensor Parameter | MAP Sensor Parameter With 5 Inches of Vacuum Applied | MAP Sensor Parameter With 10 Inches of Vacuum Applied |
| 100 kPa (14.5 psi) | 79-87 kPa (11.5-12.6 psi) | 62-70 kPa (9-10.2 psi) |
| 95 kPa (13.8 psi) | 74-82 kPa (10.7-11.9 psi) | 57-65 kPa (8.3-9.4 psi) |
| 90 kPa (13.1 psi) | 69-77 kPa (10-11.2 psi) | 52-60 kPa (7.5-8.7 psi) |
| 80 kPa (11.6 psi) | 59-67 kPa (8.6-9.7 psi) | 42-50 kPa (6.1-7.3 psi) |
| 70 kPa (10.2 psi) | 49-57 kPa (7.1-8.3 psi) | 32-40 kPa (4.7-5.8 psi) |
| 60 kPa (8.7 psi) | 39-47 kPa (5.7-6.8 psi) | 22-30 kPa (3.2-4.4 psi) |
Erratic Signal Test
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Ignition OFF, remove the B74 MAP sensor.
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Install a 3 A fused jumper wire between the 5 V reference circuit terminal 1 and the corresponding terminal of the B74 MAP sensor.
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Install a jumper wire between the low reference circuit terminal 2 of the B74 MAP sensor and ground.
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Install a jumper wire at terminal 3 of the B74 MAP sensor.
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Connect a DMM between the jumper wire from terminal 3 of the B74 MAP sensor and ground.
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Turn on ignition and slowly create, with
J 23738-A
Mityvac or
J 35555
Metal Mityvac, a vacuum by the sensor while observing the voltage on the multimeter. The voltage should vary between 0 and 5.2 V without any spikes or dropouts.
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| 7. |
If the voltage reading is erratic, replace the B74 MAP sensor.
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| Repair Instructions |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for ECM replacement, setup, and programming
