Envoy, Rainer, Trailblazer 2006-2007

5.3L V8 VIN M Auto 1

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5.3L V8 VIN M Auto

Trouble Code: C0241



Powertrain Control Module (PCM) Indicated Requested Torque Malfunction

Trouble Code: C0241



Pulse Width Modulated (PWM) Requested Torque

Possible Causes:

Thoroughly inspect connections or circuitry that may cause an intermittent malfunction. Refer to the following:



Testing for Electrical Intermittents
 
Testing for Intermittent Conditions and Poor Connections
 
Wiring Repairs
 
Connector Repairs
 

Trouble Code: C0241



Powertrain Control Module (PCM) Indicated Requested Torque Malfunction

Possible Causes:



Check for poor or intermittent connections of the EBCM and the PCM. Refer to Testing for Intermittent Conditions and Poor Connections .
 

Trouble Code: C0244



Pulse Width Modulated (PWM) Delivered Torque

Possible Causes:



It is very important that a thorough inspection of the wiring and connectors be performed. Failure to carefully and fully inspect wiring and connectors may result in misdiagnosis, causing part replacement with reappearance of the malfunction.
 
If an intermittent malfunction exists, refer to Checking Aftermarket Accessories .
 
Possible causes for DTC C0244 to set:

An open in the torque delivered control circuit
 
Torque Delivered Control circuit shorted to ground or voltage
 
A communication frequency problem
 
A communication duty cycle problem
 
Torque delivered control circuit has a wiring problem, terminal corrosion, or poor connections
 
EBCM not receiving information from the PCM
 

 

Trouble Code: C0244



Pulse Width Modulated (PWM) Delivered Torque

Possible Causes:

Thoroughly inspect connections or circuitry that may cause an intermittent malfunction. Refer to the following:



Testing for Electrical Intermittents
 
Testing for Intermittent Conditions and Poor Connections
 
Wiring Repairs
 
Connector Repairs
 

Trouble Code: C0244



Pulse Width Modulated (PWM) Delivered Torque

Possible Causes:



Check for poor or intermittent connections of the EBCM and the PCM. Refer to Testing for Intermittent Conditions and Poor Connections .
 

Trouble Code: P0016



Crankshaft Position (CKP) Camshaft Position (CMP) Correlation

Trouble Code: P0030



HO2S Heater Control Circuit Bank 1 Sensor 1

Trouble Code: P0036



HO2S Heater Control Circuit Bank 1 Sensor 2

Trouble Code: P0050



HO2S Heater Control Circuit Bank 2 Sensor 1

Trouble Code: P0050



HO2S Heater Control Bank 2 Sensor 1

Trouble Code: P0053



HO2S Heater Resistance Bank 1 Sensor 1

Trouble Code: P0053



HO2S Heater Resistance Circuit Bank 1 Sensor 1

Trouble Code: P0054



HO2S Heater Resistance Bank 1 Sensor 2

Trouble Code: P0054



HO2S Heater Resistance Circuit Bank 1 Sensor 2

Trouble Code: P0056



HO2S Heater Control Circuit Bank 2 Sensor 2

Trouble Code: P0056



HO2S Heater Control Bank 2 Sensor 2

Trouble Code: P0059



HO2S Heater Resistance Bank 2 Sensor 1

Trouble Code: P0060



HO2S Heater Resistance Bank 2 Sensor 2

Trouble Code: P0068



Throttle Body Airflow Performance

Trouble Code: P0101



Mass Air Flow (MAF) Sensor Performance

Possible Causes:



Inspect the harness of the MAF sensor to verify that it is not routed too close to the following components:

The secondary ignition wires or coils
 
Any solenoids
 
Any relays
 
Any motors
 

A low minimum air rate through the sensor bore at idle or during deceleration may cause this DTC to set. Inspect for the following conditions:

Any deposits on the throttle plate or in the throttle bore
 
Any vacuum leak downstream of the MAF sensor
 

Inspect for any contamination or debris on the sensing elements of the MAF sensor.Inspect the air induction system for any water intrusion. Any water that reaches the MAF sensor will skew the sensor and may cause this DTC to set.A wide open throttle acceleration from a stop should cause the MAF sensor parameter on the scan tool to increase rapidly. This increase should be from 5-12 g/s at idle to 200 g/s or more at the time of the 1-2 shift. If the increase is not observed, inspect for a restriction in the induction system or the exhaust system.Inspect for a skewed or stuck ECT sensor.A high resistance of 15 ohms or more on the ignition 1 voltage circuit may cause the DTC to set. A high resistance may cause a driveability concern before this DTC sets.The barometric pressure that is used to calculate the predicted mass air flow value is initially based on the MAP sensor at key ON. When the engine is running, the BARO value is continually updated near wide open throttle. A skewed MAP sensor will cause the calculated mass air flow value to be inaccurate and may result in a no start condition. The value shown for the MAP sensor parameter varies with the altitude. With the ignition ON and the engine OFF, 101 kPa is the approximate value near sea level. This value will decrease by approximately 3 kPa for every 305 meters (1,000 feet) of altitude.A high resistance on the low reference circuit of the MAP sensor may cause this DTC to set.A short to voltage on the 5-volt reference circuit of the MAP sensor may cause this DTC to set.
 

Trouble Code: P0101



Mass Air Flow (MAF) Sensor Performance

Possible Causes:



A steady or intermittent high resistance of 15 ohms or greater on the ignition 1 voltage circuit will cause the MAF sensor signal to be increased by as much as 60 g/s. To pinpoint this condition perform a voltage drop test on the circuit.
 
Any type of contamination on the MAF sensor heating elements will degrade the proper operation of the sensor. Certain types of contaminants act as a heat insulator, which will impair the response of the sensor to airflow changes. Water or snow can create the opposite effect, and cause the signal to increase rapidly.
 
Depending on the current ambient temperature, and the vehicle operating conditions, a MAF sensor signal circuit that is shorted to the IAT signal circuit will increase or decrease the MAF sensor signal that is interpreted by the ECM. Additionally it may cause a rapid fluctuation in the IAT Sensor parameter.
 
A skewed or stuck engine coolant temperature (ECT) or IAT sensor will cause the calculated models to be inaccurate and may cause this DTC to run when it should not. Refer to Temperature Versus Resistance .
 

Trouble Code: P0101



Mass Air Flow (MAF) Sensor Performance

Possible Causes:



A steady or intermittent high resistance of 15 ohms or greater on the ignition 1 voltage circuit will cause the MAF sensor signal to be increased by as much as 60 g/s.
 
Depending on the current ambient temperature, and the vehicle operating conditions, a MAF sensor signal circuit that is shorted to the IAT signal circuit will cause the MAF sensor signal to be skewed or erratic. Additionally it may cause a rapid fluctuation in the IAT Sensor parameter.
 
A skewed or stuck engine coolant temperature (ECT) or IAT sensor will cause the calculated models to be inaccurate and may cause this DTC to run when it should not. Refer to Temperature Versus Resistance .
 

Trouble Code: P0102



Mass Air Flow (MAF) Sensor Circuit Low Frequency

Possible Causes:



Inspect the harness of the MAF sensor to verify that it is not routed too close to the following components:

The secondary ignition wires or coils
 
Any solenoids
 
Any relays
 
Any motors
 

Inspect for any contamination or debris on the sensing elements of the MAF sensor.A wide open throttle acceleration from a stop should cause the MAF sensor parameter on the scan tool to increase rapidly. This increase should be from 7-12 g/s at idle to 200 g/s or more at the time of the 1-2 shift. If the increase is not observed, inspect for a restriction in the induction system or the exhaust system.A high resistance of 15 ohms or more on the ignition 1 voltage circuit may cause this DTC to set. A high resistance may cause a driveability concern before this DTC sets.A high resistance of 15 ohms or more on the ground circuit of the MAF sensor may cause this DTC to set. A high resistance may cause a driveability concern before this DTC sets.
 

Trouble Code: P0102



Mass Air Flow (MAF) Sensor Circuit Low Frequency

Possible Causes:



Verify the integrity of the air induction system by inspecting for the following conditions:

A restricted or collapsed air intake duct
 
A misaligned air intake duct
 
A dirty or deteriorating air filter element
 
Any objects blocking the air inlet screen of the MAF/IAT sensor
 
Any water intrusion in the induction system
 
Any contamination or debris on the sensing elements of the MAF sensor
 
Damaged components
 
Loose or improper installation
 
Any air flow restriction
 
Any vacuum leak
 

A wide open throttle (WOT) acceleration from a stop should cause the MAF sensor parameter on the scan tool to increase rapidly. This increase should be from 2-6 g/s at idle to 100 g/s or more at the time of the 1-2 shift.Verify that any electrical aftermarket devices are properly connected and grounded. Refer to Checking Aftermarket Accessories .
 

Trouble Code: P0103



Mass Air Flow (MAF) Sensor Circuit High Frequency

Possible Causes:



Inspect the air induction system for any water intrusion. The water rapidly cools the hot sensing elements in the sensor causing a false indication of excessive air flow. Any water that reaches the MAF sensor will skew the sensor and may cause this DTC to set.
 
A poor connection in the ignition 1 voltage circuit of the MAF sensor may cause this DTC to set.
 

Trouble Code: P0103



Mass Air Flow (MAF) Sensor Circuit High Frequency

Possible Causes:



Verify the integrity of the air induction system by inspecting for the following conditions:

A restricted or collapsed air intake duct
 
A misaligned air intake duct
 
A dirty or deteriorating air filter element
 
Any objects blocking the air inlet screen of the MAF/IAT sensor
 
Any water intrusion in the induction system
 
Any contamination or debris on the sensing elements of the MAF sensor
 
Damaged components
 
Loose or improper installation
 
Any air flow restriction
 
Any vacuum leak
 

A wide open throttle (WOT) acceleration from a stop should cause the MAF sensor parameter on the scan tool to increase rapidly. This increase should be from 2-6 g/s at idle to 100 g/s or more at the time of the 1-2 shift.Verify that any electrical aftermarket devices are properly connected and grounded. Refer to Checking Aftermarket Accessories .
 

Trouble Code: P0106



Manifold Absolute Pressure (MAP) Sensor Performance

Possible Causes:

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



Verify the integrity of the air induction system by inspecting for the following conditions:

Any damaged components
 
Loose or improper installation
 
Improperly routed vacuum hoses
 
Any vacuum leak
 
Any type of restriction
 
MAP sensor seal that is missing or damaged
 

Verify that restrictions do not exist in the MAP sensor vacuum source.Verify that restrictions do not exist in the exhaust system. Refer to Restricted Exhaust .A skewed or stuck engine coolant temperature (ECT) or IAT sensor will cause the calculated models to be inaccurate and may cause this DTC to run when it should not. Refer to Temperature Versus Resistance .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 wide open throttle using the MAP sensor and a calculation. A skewed MAP sensor will cause the BARO value to be inaccurate. Use the scan tool and compare the BARO parameter at ignition ON to the Altitude vs. Barometric Pressure Table. Refer to Altitude Versus Barometric Pressure .A skewed MAP sensor will also cause the first and second intake manifold models to disagree with the actual MAP sensor measurements. Use the scan tool and compare the MAP Sensor parameter to a known good vehicle, under various operating conditions.Inspect for the following conditions:

Incorrect CAM timing--Refer to Timing Chain and Sprockets Replacement for the correct timing.
 
Worn piston rings--Refer to Engine Compression Test .
 

 

Trouble Code: P0106



Manifold Absolute Pressure (MAP) Sensor Performance

Possible Causes:

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



A skewed or stuck engine coolant temperature (ECT) or IAT sensor will cause the calculated models to be inaccurate and may cause this DTC to run when it should not. Refer to Temperature Versus Resistance .
 
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 wide open throttle using the MAP sensor and a calculation. A skewed MAP sensor will cause the BARO value to be inaccurate. Use the scan tool and compare the BARO parameter at ignition ON to the Altitude vs. Barometric Pressure Table. Refer to Altitude Versus Barometric Pressure .
 
A skewed MAP sensor will also cause the first and second intake manifold models to disagree with the actual MAP sensor measurements. Use the scan tool and compare the MAP Sensor parameter to a known good vehicle, under various operating conditions.
 
Inspect for the following conditions:

Incorrect CAM timing--Refer to Timing Chain and Sprockets Installation for the correct timing.
 
Worn piston rings--Refer to Engine Compression Test .
 

 

Trouble Code: P0107



Manifold Absolute Pressure (MAP) Sensor Circuit Low Voltage

Trouble Code: P0107



Manifold Absolute Pressure (MAP) Sensor Circuit Low Voltage

Possible Causes:

Verify the integrity of the MAP sensor system by inspecting for the following conditions:



Intake manifold vacuum leaks
 
Any damage to the MAP sensor housing
 
Any damage to the MAP sensor seal
 
A loose or improperly installed MAP sensor
 
A restriction in the vacuum source of the MAP sensor
 

Trouble Code: P0108



Manifold Absolute Pressure (MAP) Sensor Circuit High Voltage

Possible Causes:



Inspect for any vacuum leaks.
 
This DTC may set as the result of a misfire.
 
This DTC may set as the result of improper tension or alignment of the timing chain.
 
If this DTC is determined to be intermittent, refer to Testing for Intermittent Conditions and Poor Connections .
 

Trouble Code: P0108



Manifold Absolute Pressure (MAP) Sensor Circuit High Voltage

Possible Causes:

Verify the integrity of the MAP sensor system by inspecting for the following conditions:



Intake manifold vacuum leaks
 
Any damage to the MAP sensor housing
 
Any damage to the MAP sensor seal
 
A loose or improperly installed MAP sensor
 
A restriction in the vacuum source of the MAP sensor
 

Trouble Code: P0112



Intake Air Temperature (IAT) Sensor Circuit Low Voltage

Possible Causes:



When the vehicle is at ambient temperature the IAT sensor and the ECT sensor should be relatively close to each other. Refer to Temperature vs Resistance .
 
If an intermittent condition is suspected, refer to Testing for Intermittent Conditions and Poor Connections .
 

Trouble Code: P0112



Intake Air Temperature (IAT) Sensor Circuit Low Voltage

Trouble Code: P0112



Intake Air Temperature (IAT) Sensor Circuit Low Voltage

Possible Causes:



With the ignition ON, the engine OFF, if the engine is cold, a properly functioning IAT sensor will gradually increase the scan tool IAT Sensor parameter. This is due to the heat that is generated by the mass air flow (MAF) sensor heating elements.
 
Depending on the ambient temperature, an IAT sensor signal circuit or low reference circuit that is shorted to the MAF sensor signal circuit can cause a DTC P0113 to set. This condition causes a rapid fluctuation in the IAT Sensor parameter.
 
An IAT sensor signal circuit that is shorted to the MAF sensor ignition circuit can cause a DTC P0113 to set.
 

Trouble Code: P0113



Intake Air Temperature (IAT) Sensor Circuit High Voltage

Possible Causes:



When the vehicle is at ambient temperature the IAT sensor and the ECT sensor temperatures should be relatively close to each other. Refer to Temperature vs Resistance .
 
If a short to a separate 5-volt source occurs this DTC may set.
 
If an intermittent condition is suspected, refer to Testing for Intermittent Conditions and Poor Connections .
 

Trouble Code: P0113



Intake Air Temperature (IAT) Sensor Circuit High Voltage

Trouble Code: P0113



Intake Air Temperature (IAT) Sensor Circuit High Voltage

Possible Causes:



With the ignition ON, the engine OFF, if the engine is cold, a properly functioning IAT sensor will gradually increase the scan tool IAT Sensor parameter. This is due to the heat that is generated by the mass air flow (MAF) sensor heating elements.
 
Depending on the ambient temperature, an IAT sensor signal circuit or low reference circuit that is shorted to the MAF sensor signal circuit can cause a DTC P0113 to set. This condition causes a rapid fluctuation in the IAT Sensor parameter.
 
An IAT sensor signal circuit that is shorted to the MAF sensor ignition circuit can cause a DTC P0113 to set.
 

Trouble Code: P0116



Engine Coolant Temperature (ECT) Sensor Performance

 
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