Envoy, Rainer, Trailblazer 2006-2007

5.3L V8 VIN M Auto 5

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Trouble Code: P0351



Ignition Coil 1 Control Circuit

Possible Causes:



This test procedure requires that the vehicle battery has passed a load test and is completely charged. Refer to Battery Inspection/Test .
 
A high resistance condition on any IC circuit can cause an engine misfire without setting DTC P0351-P0358.
 

Trouble Code: P0352



Ignition Coil 2 Control Circuit

Trouble Code: P0352



Ignition Coil 2 Control Circuit

Possible Causes:



This test procedure requires that the vehicle battery has passed a load test and is completely charged. Refer to Battery Inspection/Test .
 
A high resistance condition on any ignition control (IC) circuit can cause an engine misfire without setting a P0351-P0358 DTC.
 

Trouble Code: P0352



Ignition Coil 2 Control Circuit

Possible Causes:



This test procedure requires that the vehicle battery has passed a load test and is completely charged. Refer to Battery Inspection/Test .
 
A high resistance condition on any IC circuit can cause an engine misfire without setting DTC P0351-P0358.
 

Trouble Code: P0353



Ignition Coil 3 Control Circuit

Trouble Code: P0353



Ignition Coil 3 Control Circuit

Possible Causes:



This test procedure requires that the vehicle battery has passed a load test and is completely charged. Refer to Battery Inspection/Test .
 
A high resistance condition on any ignition control (IC) circuit can cause an engine misfire without setting a P0351-P0358 DTC.
 

Trouble Code: P0353



Ignition Coil 3 Control Circuit

Possible Causes:



This test procedure requires that the vehicle battery has passed a load test and is completely charged. Refer to Battery Inspection/Test .
 
A high resistance condition on any IC circuit can cause an engine misfire without setting DTC P0351-P0358.
 

Trouble Code: P0354



Ignition Coil 4 Control Circuit

Trouble Code: P0354



Ignition Coil 4 Control Circuit

Possible Causes:



This test procedure requires that the vehicle battery has passed a load test and is completely charged. Refer to Battery Inspection/Test .
 
A high resistance condition on any ignition control (IC) circuit can cause an engine misfire without setting a P0351-P0358 DTC.
 

Trouble Code: P0354



Ignition Coil 4 Control Circuit

Possible Causes:



This test procedure requires that the vehicle battery has passed a load test and is completely charged. Refer to Battery Inspection/Test .
 
A high resistance condition on any IC circuit can cause an engine misfire without setting DTC P0351-P0358.
 

Trouble Code: P0355



Ignition Coil 5 Control Circuit

Trouble Code: P0355



Ignition Coil 5 Control Circuit

Possible Causes:



This test procedure requires that the vehicle battery has passed a load test and is completely charged. Refer to Battery Inspection/Test .
 
A high resistance condition on any ignition control (IC) circuit can cause an engine misfire without setting a P0351-P0358 DTC.
 

Trouble Code: P0355



Ignition Coil 5 Control Circuit

Possible Causes:



This test procedure requires that the vehicle battery has passed a load test and is completely charged. Refer to Battery Inspection/Test .
 
A high resistance condition on any IC circuit can cause an engine misfire without setting DTC P0351-P0358.
 

Trouble Code: P0356



Ignition Coil 6 Control Circuit

Trouble Code: P0356



Ignition Coil 6 Control Circuit

Possible Causes:



This test procedure requires that the vehicle battery has passed a load test and is completely charged. Refer to Battery Inspection/Test .
 
A high resistance condition on any ignition control (IC) circuit can cause an engine misfire without setting a P0351-P0358 DTC.
 

Trouble Code: P0356



Ignition Coil 6 Control Circuit

Possible Causes:



This test procedure requires that the vehicle battery has passed a load test and is completely charged. Refer to Battery Inspection/Test .
 
A high resistance condition on any IC circuit can cause an engine misfire without setting DTC P0351-P0358.
 

Trouble Code: P0357



Ignition Coil 7 Control Circuit

Trouble Code: P0357



Ignition Coil 7 Control Circuit

Possible Causes:



This test procedure requires that the vehicle battery has passed a load test and is completely charged. Refer to Battery Inspection/Test .
 
A high resistance condition on any ignition control (IC) circuit can cause an engine misfire without setting a P0351-P0358 DTC.
 

Trouble Code: P0357



Ignition Coil 7 Control Circuit

Possible Causes:



This test procedure requires that the vehicle battery has passed a load test and is completely charged. Refer to Battery Inspection/Test .
 
A high resistance condition on any IC circuit can cause an engine misfire without setting DTC P0351-P0358.
 

Trouble Code: P0358



Ignition Coil 8 Control Circuit

Trouble Code: P0358



Ignition Coil 8 Control Circuit

Possible Causes:



This test procedure requires that the vehicle battery has passed a load test and is completely charged. Refer to Battery Inspection/Test .
 
A high resistance condition on any ignition control (IC) circuit can cause an engine misfire without setting a P0351-P0358 DTC.
 

Trouble Code: P0358



Ignition Coil 8 Control Circuit

Possible Causes:



This test procedure requires that the vehicle battery has passed a load test and is completely charged. Refer to Battery Inspection/Test .
 
A high resistance condition on any IC circuit can cause an engine misfire without setting DTC P0351-P0358.
 

Trouble Code: P0420



Catalyst System Low Efficiency Bank 1

Possible Causes:



The catalyst test may abort due to a change in the engine load. Do not change the engine load, ensure the AC is OFF, the coolant fan is not cycling, while a catalyst test is in progress.
 
Driving the vehicle under the conditions outlined in the inspection/maintenance (I/M) section can verify whether the fault is present.
 
These conditions may cause a catalytic converter to degrade. Inspect for the following conditions:

An engine misfire
 
High engine oil or high coolant consumption
 
Retarded spark timing
 
A weak or poor spark
 
A lean fuel mixture
 
A rich fuel mixture
 
A damaged oxygen sensor or wiring harness
 
If an intermittent condition cannot be duplicated, the information included in Freeze Frame data can be useful in determining the vehicle operating conditions when the DTC was set.
 

The catalyst may have been temporarily contaminated with a chemical from a fuel additive, fuel contamination, or any of the above conditions.
 

Trouble Code: P0420



Catalyst System Low Efficiency Bank 1

Trouble Code: P0430



Catalyst System Low Efficiency Bank 2

Possible Causes:



The catalyst test may abort due to a change in the engine load. Do not change the engine load, ensure the AC is OFF, the coolant fan is not cycling, while a catalyst test is in progress.
 
Driving the vehicle under the conditions outlined in the inspection/maintenance (I/M) section can verify whether the fault is present.
 
These conditions may cause a catalytic converter to degrade. Inspect for the following conditions:

An engine misfire
 
High engine oil or high coolant consumption
 
Retarded spark timing
 
A weak or poor spark
 
A lean fuel mixture
 
A rich fuel mixture
 
A damaged oxygen sensor or wiring harness
 
If an intermittent condition cannot be duplicated, the information included in Freeze Frame data can be useful in determining the vehicle operating conditions when the DTC was set.
 

The catalyst may have been temporarily contaminated with a chemical from a fuel additive, fuel contamination, or any of the above conditions.
 

Trouble Code: P0430



Catalyst System Low Efficiency Bank 2

Trouble Code: P0442



Evaporative Emission (EVAP) System Small Leak Detected

Possible Causes:



To help locate intermittent leaks, use the J 41413-200 Evaporative Emission System Tester (EEST) to introduce smoke into the EVAP system. Move all EVAP components while observing smoke with the J 41413-SPT High Intensity White Light.
 
A condition may exist where a leak in the EVAP system only exists under a vacuum condition. This type of leak may be detected by using a scan tool PURGE/SEAL function to create a vacuum, then observe the FTP parameter for a vacuum decay.
 
To improve the visibility of the smoke exiting the EVAP system, observe the suspected leak area from different angles with the J 41413-SPT .
 
For intermittent conditions, refer to Testing for Intermittent Conditions and Poor Connections .
 

Trouble Code: P0442



Evaporative Emission (EVAP) System Small Leak Detected

Possible Causes:



To improve the visibility of the smoke exiting the EVAP system, observe the suspected leak area from different angles with the J 41413-SPT .
 
To help locate intermittent leaks using the J 41413-200 , move all EVAP components while observing smoke with the J 41413-SPT .
 
Individual components can be isolated and tested using J 41413-300 .
 
A condition may exist where a leak in the EVAP system only exists under a vacuum condition. By using the scan tool Purge/Seal function to create a vacuum, seal the system and observe the FTP parameter for vacuum decay. This type of leak may be detected.
 

Trouble Code: P0442



Evaporative Emission (EVAP) System Small Leak Detected

Possible Causes:



The EVAP system can be filled with smoke more quickly and completely by opening the system opposite the end where the smoke is injected. When injecting smoke at the service port remove the fuel fill cap, or temporarily leave the vent open, until smoke is observed then close the system and continue testing. If using a fuel cap adapter at the filler neck, use the J 41413-VLV at the service port to allow the system to fill faster.
 
To help locate intermittent leaks using the J 41413-200 , move all EVAP components while observing smoke with the J 41413-SPT .
 
Individual components can be isolated and tested using adapters in the J 41413-300 .
 
A condition may exist where a leak in the EVAP system only exists under a vacuum condition. This type of leak may be detected by using the scan tool Purge/Seal function to create a vacuum in the EVAP system and then observe the FTP parameter for vacuum decay.
 

Trouble Code: P0443



Evaporative Emission (EVAP) Purge Solenoid Control Circuit

Trouble Code: P0446



Evaporative Emission (EVAP) Vent System Performance

Possible Causes:



When using the electronic emission system tester (EEST) to apply pressure, you can regulate the amount of pressure by activating the remote switch ON and OFF while observing pressure in the EVAP system using a scan tool. DO NOT use more than 5 inches H2O. More than 5 inches H2O applied to the EVAP system can cause the canister vent solenoid valve to temporarily remain in the closed position, which could lead to misdiagnosis in this procedure.
 
An intermittent condition could be caused by a damaged EVAP vent housing, a temporary blockage at the EVAP canister vent solenoid valve inlet, or a pinched vent hose. A blockage in the vent system will also cause a poor fuel fill condition.
 
For intermittent conditions, refer to Testing for Intermittent Conditions and Poor Connections .
 
An EVAP canister, vent hose or vent solenoid valve that has restricted flow may cause this DTC to set. Using purge solenoid valve command with a scan tool, will allow vacuum to be applied to the system instead of pressure. With the EVAP canister vent solenoid valve open and the EVAP canister purge solenoid valve commanded to 100 percent, vacuum should not increase to more than 9 inches H2O.
 

Trouble Code: P0446



Evaporative Emissions (EVAP) Vent System Performance

Possible Causes:



An intermittent condition could be caused by a damaged EVAP vent housing, a temporary blockage at the EVAP canister vent solenoid valve inlet, or a pinched vent hose. A blockage in the vent system will also cause a poor fuel fill condition.
 
An EVAP canister filter that is restricted can cause this DTC to set.
 

Trouble Code: P0449



Evaporative Emission (EVAP) vent Solenoid Control Circuit

Trouble Code: P0449



Evaporative Emission (EVAP) Vent Solenoid Control Circuit

Trouble Code: P0451



Fuel Tank Pressure (FTP) Sensor Performance

Possible Causes:



When using the J 41413-200 Evaporative Emission System Tester (EEST) to apply pressure, you can regulate the amount of pressure by activating the remote switch ON and OFF while observing pressure in the EVAP system using a scan tool.
 
A restriction in the EVAP canister or vent lines could prevent fuel vapor pressure from bleeding off fast enough. If the vent system cannot bleed off pressure fast enough, this code can set. When pressure is applied to the system and released, a properly operating system will return to the atmospheric pressure rapidly. By using a scan tool and the J 41413-200 pressure can be applied to the system, then released, while monitoring the FTP sensor parameter to see that pressure can be released within 30 seconds.
 
An FTP sensor that is skewed or does not have a linear transition from low to high may cause this code to set. A scan tool output controls, snapshot, and plot functions can help detect erratic sensor response. To test the sensor signal under vacuum conditions, use the Quick Snapshot and the Purge/Seal functions to capture data while commanding purge to 20 percent, then plot the data to look for erratic sensor operation. A similar test can be done for the pressure side of the sensor operation by applying pressure with the J 41413-200 while taking a snapshot.
 
A full fuel tank may cause misdiagnosis.
 

Trouble Code: P0451



Fuel Tank Pressure (FTP) Sensor Performance

Possible Causes:



Ensure that the reference port on the FTP sensor is unobstructed.
 
Scan tool output controls, snapshot, and the plot function can help detect erratic sensor operation. To observe the Fuel Tank Pressure Sensor signal under vacuum conditions, use the Quick Snapshot and the EVAP Purge/Seal function to capture data while commanding purge to 20 percent. Then plot the data to look for erratic sensor operation. A similar test can be done for the pressure side of the sensor range by applying pressure with J 41413-200 Evaporative Emission System Tester (EEST) while taking a snapshot with the scan tool.
 

Trouble Code: P0451



Fuel Tank Pressure (FTP) Sensor Performance

Possible Causes:

P0451 and P0454



A restriction in the EVAP canister or vent lines could prevent fuel vapor pressure from bleeding off fast enough. If the vent system cannot bleed off pressure fast enough, the re-zero procedure may not complete successfully, which could cause this code to set.
 
Ensure that the reference port on the FTP sensor is unobstructed.
 
An FTP sensor that is skewed or does not have a linear transition from low to high may cause this code to set. Scan tool output controls, snapshot, and plot functions can help detect erratic sensor response. To test the sensor signal under vacuum conditions, use the Quick Snapshot and the Purge/Seal functions to capture data while commanding purge to 20 percent, then plot the data to look for erratic sensor operation. A similar test can be done for the pressure side of the sensor operation by applying pressure with the J 41413-200 while taking a snapshot.
 

Trouble Code: P0452



Fuel Tank Pressure (FTP) Sensor Circuit Low Voltage

Trouble Code: P0452



Fuel Tank Pressure (FTP) Sensor Circuit Low Voltage

Possible Causes:



Ensure that the reference port on the FTP sensor is unobstructed.
 
Scan tool output controls, snapshot, and the plot function can help detect erratic sensor operation. To observe the Fuel Tank Pressure Sensor signal under vacuum conditions, use the Quick Snapshot and the EVAP Purge/Seal function to capture data while commanding purge to 20 percent. Then plot the data to look for erratic sensor operation. A similar test can be done for the pressure side of the sensor range by applying pressure with J 41413-200 Evaporative Emission System Tester (EEST) while taking a snapshot with the scan tool.
 

Trouble Code: P0452



Fuel Tank Pressure (FTP) Sensor Circuit Low Voltage

Possible Causes:

P0451 and P0454



A restriction in the EVAP canister or vent lines could prevent fuel vapor pressure from bleeding off fast enough. If the vent system cannot bleed off pressure fast enough, the re-zero procedure may not complete successfully, which could cause this code to set.
 
Ensure that the reference port on the FTP sensor is unobstructed.
 
An FTP sensor that is skewed or does not have a linear transition from low to high may cause this code to set. Scan tool output controls, snapshot, and plot functions can help detect erratic sensor response. To test the sensor signal under vacuum conditions, use the Quick Snapshot and the Purge/Seal functions to capture data while commanding purge to 20 percent, then plot the data to look for erratic sensor operation. A similar test can be done for the pressure side of the sensor operation by applying pressure with the J 41413-200 while taking a snapshot.
 

 
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