O2 sensor Problem? - Pontiac G6 Forum
 
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post #1 of 9 (permalink) Old 01-21-2012, 06:53 AM Thread Starter
Colon Fire & Rescue
 
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Location: Colon Mi
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O2 sensor Problem?

Just bought my 05 G6 GT last week. When i bought it the CEL was on and a quick trip to autozone for a code read that presented a bad O2 sensor. (Bank 2 sensor 1). Easy fix...So I thought. After a quick change and the code reset I thought I was golden. Remote started the car the following morning. When i went to get into the vehicle the G6 was not running. Started it up and the CEL was back on and i headed back to autozone. Again the Bank 2 sensor 1 was the problem. Took it into a local mechanic and discovered the wiring to that sensor was bad. An hour wait and $30 later the wires were fixed and the CEL was off. Again remote started the next morning and after about 4 minutes CEL was back on and Bank 2 Sensor 1 code was there again. Now autozone, my mechanic and I are all scratching our heads. Any help guys? Thanks ahead of time
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post #2 of 9 (permalink) Old 01-21-2012, 07:14 AM
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what error code are you getting?
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post #3 of 9 (permalink) Old 01-21-2012, 07:21 AM Thread Starter
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I want to say it was 050 and 059? Heater circuit
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post #4 of 9 (permalink) Old 01-21-2012, 09:25 AM
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This maybe your problem, not sure.

When replacing the HO2S perform a code clear with a scan tool, regardless of whether or not a DTC is set. Performing a code clear will reset the HO2S resistance learned value. Failure to perform a code clear may result in an HO2S failure.
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post #5 of 9 (permalink) Old 01-21-2012, 11:41 AM
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I would need to know the exact code that is being popped to help.



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post #6 of 9 (permalink) Old 01-22-2012, 05:30 AM Thread Starter
Colon Fire & Rescue
 
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Im heading back to my mechanic monday. I will get the codes then but hopefully it will be fixed.
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post #7 of 9 (permalink) Old 01-22-2012, 01:27 PM
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Service Information
2007 Pontiac G6 | G6 (VIN Z) Service Manual | Document ID: 1824156
--------------------------------------------------------------------------------

DTC P0050, P0056, P0059, P0060, P0155, or P0161
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors
DTC P0050: HO2S Heater Control Circuit Bank 2 Sensor 1

DTC P0056: HO2S Heater Control Circuit Bank 2 Sensor 2

DTC P0059: HO2S Heater Resistance Bank 2 Sensor 1

DTC P0060: HO2S Heater Resistance Bank 2 Sensor 2

DTC P0155: HO2S Heater Performance Bank 2 Sensor 1

DTC P0161: HO2S Heater Performance Bank 2 Sensor 2


Diagnostic Fault Information
HO2S Heater Bank 2 Sensor 1 Circuit
Short to Ground
High Resistance
Open
Short to Voltage
Signal Performance

HO2S Heater Voltage Supply
Opens fuse

P0030, P0036, P0050, P0053, P0054, P0056, P0059, P0060, P0102, P0134, P0135, P0140, P0141, P0154, P0155, P0160, P0161, P0443
P0059
P0050, P0059, P0154, P0155
P0690
P0155

HO2S Heater Low Control
P0050, P0056
P0059, P0154
P0050, P0059, P0154, P0155
P0050, P0154, P0155, P0690
P0155

HO2S Heater Bank 2 Sensor 2 Circuit
Short to Ground
High Resistance
Open
Short to Voltage
Signal Performance

HO2S Heater Voltage Supply
Opens fuse

P0030, P0036, P0050, P0053, P0054, P0056, P0059, P0060, P0102, P0134, P0135, P0140, P0141, P0154, P0155, P0160, P0161, P0443
P0060
P0056, P0060, P0160, P0161
P0690
P0161

HO2S Heater Low Control
P0050, P0056
P0060, P0160
P0056, P0060, P0160, P0161
P0056, P0160, P0161, P0690
P0161


Typical Scan Tool Data
HO2S Heater Bank 2 Sensor 1 Circuit
Normal Range
Short to Ground
Open
Short to Voltage

HO2S Heater Voltage Supply
Approximately 0.5-2 A
0.00 A
0.00 A
Approximately 0.5-2 A

HO2S Heater Voltage Supply
7-100%
7%
7%
7-100%

HO2S Heater Low Control
Approximately 0.5-2 A
0.00 A
0.00 A
0.00 A

HO2S Heater Low Control
7-100%
7%
7%
7%

HO2S Heater Bank 2 Sensor 2 Circuit
Normal Range
Short to Ground
Open
Short to Voltage

HO2S Heater Voltage Supply
Approximately 0.5-2 A
0.00 A
0.00 A
Approximately 0.5-2 A

HO2S Heater Voltage Supply
7-100%
7%
7%
7-100%

HO2S Heater Low Control
Approximately 0.5-2 A
0.00 A
0.00 A
0.00 A

HO2S Heater Low Control
7-100%
7%
7%
7%


Circuit/System Description
Heated oxygen sensors (HO2S) are used for fuel control and post catalyst monitoring. Each HO2S compares the oxygen content of the surrounding air with the oxygen content in the exhaust stream. The HO2S must reach operating temperature to provide an accurate voltage signal. A heating element inside the HO2S minimizes the time required for the sensor to reach operating temperature. Voltage is provided to the heater by an ignition voltage circuit through a fuse. With the engine running, ground is provided to the heater by the HO2S heater low control circuit, through a low side driver within the engine control module (ECM). The ECM uses pulse width modulation (PWM) to control the HO2S heater operation to maintain a specific HO2S operating temperature range.

Conditions for Running the DTC
P0050 and P0056
The engine is cranking or running.

The system voltage is between 10-18 volts.

P0059 and P0060
The ignition is OFF for more than 10 hours.

The ECT Sensor parameter is between -30 and +45C (-22 and +133F) at engine start-up.

The system voltage is between 10-18 volts.

This diagnostic runs one time per valid cold start when the above conditions are met.

P0155
DTCs P0050, P0059, P0068, P0101, P0102, P0103, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0128, P0135, P0141, P0201, P0202, P0203, P0204, P0205, P0206, P0220, P0222, P0223, P0442, P0443, P0446, P0449, P0451, P0452, P0453, P0454, P0455, P0496, P1516, P2101, P2119, P2135, P2176 are not set.

The system voltage is between 10-18 volts.

The scan tool special functions are not active.

The Engine Run Time parameter is more than 180 seconds.

The ECT Sensor parameter is at least 65C (149F).

The MAF sensor parameter is between 5-30 g/s.

The Engine Speed parameter is between 500-3,000 RPM.

The above conditions have been met for more than 6 seconds.

P0161
DTCs P0056, P0060, P0068, P0101, P0102, P0103, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0128, P0201, P0202, P0203, P0204, P0205, P0206, P0220, P0222, P0223, P0442, P0443, P0446, P0449, P0451, P0452, P0453, P0454, P0455, P0496, P1516, P2101, P2119, P2135, P2176 are not set.

The system voltage is between 10-18 volts.

The scan tool special functions are not active.

The Engine Run Time parameter is at least 180 seconds.

The ECT parameter is at least 65C (149F).

The MAF Sensor parameter is between 5-30 g/s.

The Engine Speed parameter is between 500-3,000 RPM.

The above conditions have been met for more than 6 seconds.

Conditions for Setting the DTC
P0050 and P0056
The control module detects that the HO2S heater control circuit status is incorrect for more than 2 seconds.

This diagnostic runs continuously.

P0059 and P0060
The control module detects that the HO2S heater calculated resistance is not within an expected range at engine start-up for 1 second.

P0155
The HO2S heater current is less than 0.31 amp or more than 1.5 amps for more than 8 seconds, twice in a 1-minute period.

The test is run 2 times per trip.

P0161
The HO2S heater current is less than 0.21 amp or more than 0.96 amp for more than 8 seconds, twice within a 1-minute test period.

The test is run 2 times per trip.

Action Taken When the DTC Sets
DTCs P0050, P0056, P0059, P0060, P0155, and P0161 are Type B DTCs.

Conditions for Clearing the MIL/DTC
DTCs P0050, P0056, P0059, P0060, P0155, and P0161 are Type B DTCs.

Diagnostic Aids
When using a high impedance, low current draw, test lamp to load the heater circuit, the test lamp flash may be dim, the scan tool Heater Command parameter may indicate 7 percent, and the Heater parameter may indicate 0.00 amps. This is a normal condition.

Reference Information
Schematic Reference
Engine Controls Schematics

Connector End View Reference

Engine Control Module Connector End Views

Engine Controls Connector End Views


Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections

Wiring Repairs

Heated Oxygen Sensor Wiring Repairs


DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference
Scan Tool Data List

Circuit/System Verification
Allow the engine to reach operating temperature.
Engine running, verify the appropriate scan tool HO2S Heater parameter is varying between 0.5-2 amp.
Circuit/System Testing
Important: You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.

Ignition OFF, disconnect the harness connector at the appropriate HO2S.
Ignition ON, verify that a test lamp illuminates between the appropriate HO2S heater voltage supply circuit terminal D and ground.
⇒ If the test lamp does not illuminate, test the HO2S heater voltage supply circuit for a short to ground or an open/high resistance. If the circuit tests normal and the HO2S heater voltage supply circuit fuse is open, test all components connected to the fuse and replace as necessary.

Ignition ON, verify that a test lamp does not illuminate between the appropriate HO2S heater voltage supply circuit terminal D and the appropriate HO2S heater low control circuit terminal C.
⇒ If the lamp illuminates, test the HO2S heater low control circuit for a short to ground. If the circuit tests normal, replace the ECM.

Engine running, leave the test lamp connected from the previous step. The lamp should flash or be ON steady.
⇒ If the test lamp is not ON steady or flashing, test the HO2S heater low control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM.

Important:

The output driver should detect a short to voltage and turn OFF. If a resistance fault is present the driver will remain ON and the scan tool will display more than 0.0 amp. Less than 10 ohms of resistance may set a DTC.

Performing this test may set additional DTCs.


Ignition OFF, install a 30A fused jumper wire between the appropriate HO2S heater voltage supply circuit terminal D and the appropriate HO2S heater low control circuit terminal C.
Engine running, verify the appropriate scan tool HO2S Heater parameter is less than 0.1 amp.
⇒ If more than the specified range, test the HO2S heater voltage supply and HO2S heater low control circuits for more than 1 ohm of resistance. If the circuits test normal, replace the ECM.

If the ECM and all circuits test normal, replace the appropriate HO2S.
Repair Instructions
Notice: Refer to Heated Oxygen Sensor Resistance Learn Reset Notice in the Preface section.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Heated Oxygen Sensor Replacement - Bank 2 Sensor 1

Heated Oxygen Sensor Replacement - Bank 2 Sensor 2

Control Module References for control module replacement, setup, and programming



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post #8 of 9 (permalink) Old 01-23-2012, 02:11 PM Thread Starter
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Well i was hoping to come back today with what the fix was to the problem. About half way to my mechanic the light just went off.... Not sure if it's completely fixed but hey, my remote starter works! Thanks for everyone's input though. Cheers
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post #9 of 9 (permalink) Old 01-23-2012, 02:55 PM
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Any DTC that lights up the MIL will cause the remote start system to disable.



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