Mechanics

CHEVROLET ASTRO SENSOR PROBLEM

2005 Chevrolet Astro • 150,330 miles

I am getting two codes p.0155 and p.0059 related to oxigen sensor do I neet to replace it? How can I check the oxigen sensor?
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Arriz
December 15, 2012.



DTC P0059

CIRCUIT DESCRIPTION
The heated oxygen sensor (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 the ignition 1 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 powertrain control module (PCM). The PCM commands the heater ON or OFF to maintain a specific HO2S operating temperature range. The PCM determines the temperature by measuring the current flow through the heater. When the heater is in the ON state, the PCM will pulse the heater OFF for a duration of 50 ms, once per second. The PCM calculates the heater resistance on a cold start. This diagnostic will only run once per ignition cycle. If the PCM detects that the heater calculated resistance is not within the expected range, the following DTCs will set: DTC P0053 for HO2S bank 1 sensor 1
DTC P0054 for HO2S bank 1 sensor 2
DTC P0059 for HO2S bank 2 sensor 1
DTC DESCRIPTORS
This diagnostic procedure supports the following DTCs: DTC P0053 HO2S Heater Resistance Bank 1 Sensor 1
DTC P0054 HO2S Heater Resistance Bank 1 Sensor 2
DTC P0059 HO2S Heater Resistance Bank 2 Sensor 1
CONDITIONS FOR RUNNING THE DTC
DTCs P0112, P0113, P0116, P0117, P0118, P0128, P2610 are not set.
The ignition is OFF for more than 10 hours.
The ECT Sensor parameter is between 0-40°C (32-104°F) at engine start-up.
The ECT Sensor parameter minus the IAT Sensor parameter is less than 8°C (14°F) at engine start-up.
The engine is started.
The above conditions are met for up to 100 seconds.
This diagnostic runs 1 time per valid cold start once the above conditions are met.
CONDITIONS FOR SETTING THE DTC
The PCM detects that the affected HO2S heater calculated resistance is not within an expected range at engine start-up for 1 second.

ACTION TAKEN WHEN THE DTC SETS
The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.
CONDITIONS FOR CLEARING THE MIL/DTC
The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
Clear the MIL and the DTC with a scan tool.
TEST DESCRIPTION

Steps 1 - 7

Steps 8 - 19

Steps 20 - 21

The number below refers to the step number on the diagnostic table.
With no fault present, the test lamp will blink once per second.

DTC P0155

CIRCUIT DESCRIPTION
The heated oxygen sensor (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 the ignition 1 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 powertrain control module (PCM). The PCM commands the heater ON or OFF to maintain a specific HO2S operating temperature range. The PCM determines the temperature by measuring the current flow through the heater. When the heater is in the ON state, the PCM will pulse the heater OFF for a duration of 50 ms, once per second. When the heater is in the OFF state, the PCM will pulse the heater ON for a duration of 50 ms, once per second. The PCM monitors the heater current with the engine running. This diagnostic will only run once per ignition cycle. If the PCM detects that the heater current is not within an expected range, the following DTCs will set: DTC P0135 for HO2S bank 1 sensor 1
DTC P0141 for HO2S bank 1 sensor 2
DTC P0155 for HO2S bank 2 sensor 1
DTC DESCRIPTORS
This diagnostic procedure supports the following DTCs: DTC P0135 HO2S Heater Performance Bank 1 Sensor 1
DTC P0141 HO2S Heater Performance Bank 1 Sensor 2
DTC P0155 HO2S Heater Performance Bank 2 Sensor 1
CONDITIONS FOR RUNNING THE DTC
DTCs P0053, P0054, P0059, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0121, P0122, P0123, P0128, P0200, P0442, P0446, P0452, P0453, P0455, P0496 are not set.
The ECT Sensor parameter is more than 50°C (122°F).
The Ignition 1 Signal parameter is between 10-18 volts.
The MAF Sensor parameter is between 3-40 g/s.
Then Engine Speed parameter is between 500-3,000 RPM.
The Engine Run Time parameter is more than 120 seconds.
The above conditions are met for2 seconds.
This diagnostic runs one time per drive cycle once the above conditions are met.
CONDITIONS FOR SETTING THE DTC
The PCM detects that the affected HO2S Heater Current parameter is more than 1.375 amps or less than 0.25 amps.
The above condition is met for 10 seconds.
ACTION TAKEN WHEN THE DTC SETS
The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.
CONDITIONS FOR CLEARING THE MIL/DTC
The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
Clear the MIL and the DTC with a scan tool.

ASEMaster6371
Dec 15, 2012.
1. That the specific O2 Sensor the DTC is accusing as having a heater malfunction does not have its wires shorted and melted together on the exhaust pipe. •When this happens, you can bet that the O2 Sensor Heater fuse has blown.
•This is usually the end result of human error, usually because some component was removed and replaced and the O2 Sensor had to be disconnected.
When reconnected, the wiring was not secured to its original routing and the wires ended up rubbing against the exhaust pipe or exhaust manifold.

2. That 12 Volts are present in at least one of the 4 wires. You need to test for these 12 Volts with a Multimeter in Volts DC mode with the Key On (but Engine Off). •I suggest testing for this voltage even if the O2 Sensor's wires are NOT shorted and melted to the exhaust pipe or exhaust manifold.

Well, to make the long story short, you'll usually see one of the following cases: CASE 1: O2 Sensor wires are not melted together and 12 volts are present. Then you can replace the O2 Sensor with confidence knowing the Diagnostic Trouble Code will be solved.

CASE 2: O2 Sensor wires are melted together and 12 volts are NOT present, then the O2 Sensor heater fuse is blown (and of course you'll have to replace the O2 Sensor too).

Bank 2 sensor 1 means that the O2 sensor inquestion is the one before the catalytic converter on the passenger side of the engine.

Freemba
Dec 15, 2012.
Thank you so much for the information I checked the 02 seansor and found one of the black wires shorted and melted to the exhaust pipe. Thanks.

Tiny
Arriz
Dec 16, 2012.