Question about 1990 GMC Sierra

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O2 sensor issue.

Hi

I have a GMC Sierra 1500 4.3L V-6 with a O2 sensor problem. I replaced it with a new one and cleared the ECM/PCM by disconnecting the battery cable (-). I tested it again using the ALDL and all looks good. I drive it about 5 miles and it comes on again, same issue. It's a truck that needs TLC and hasn't been ran much in six months if at all. When I first replaced it all was good and the next issue was the coolant sensor. I replaced it and all looked good till I drove over 5 miles then the O2 sensor started acting up. Any Ideas?

Best Regards
Chris

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YOUR MOST LIKELY PROBLEM IS A FAULTY CAT. CONVERTOR. THE PCM MONITORS THE INLET & OUTLET SENSOR PARAMETERS, IF THE CAT. EFFICIENCY IS BELOW SPECS; IT WILL SET A O2 SENSOR CODE. THE PCM RUNS A TEST EFFICIENCY TEST THAT TAKES APROX. 7-10 MIN. THE BEST WAY TO DETERMINE IF THIS YOUR CONCERN IS TO MONITOR A SCAN TOOL WHILE ENGINE IS RUNNING.

Posted on Nov 08, 2008

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What does a o2 sensor look like


Heated Oxygen Sensor

Print


Removal & Installation

3.5L

WARNING When disconnecting the sensor electrical connector, do not pull directly on wire going into sensor.

  1. Disconnect the negative battery cable.
  2. Disconnect the heated oxygen sensor electrical connector.
  3. Use a socket such as a crowfoot wrench to remove oxygen sensor.

To Install:

NOTE When replacing an O2 Sensor, the PCM RAM memory must be cleared, either by disconnecting the PCM C-1 connector or momentarily disconnecting the Battery negative terminal. The NGC learns the characteristics of each O2 heater element and these old values should be cleared when installing a new O2 sensor. The customer may experience driveability issues if this is not performed.
  1. After removing the sensor, the threads must be cleaned with an 18 mm X 1.5 + 6E tap. If reusing the original sensor, coat the sensor threads with an anti-seize compound such as Loctite 771- 64 or equivalent. New sensors have compound on the threads and do not require an additional coating. Tighten the sensor to 28 Nm (20 ft. lbs.) torque.
  2. Connect the heated oxygen sensor electrical connector.
  3. Install the wiring clip to the heat shield.
  4. Connect the negative battery cable.

    0996b43f80202384.jpg enlarge_icon.gifenlarge_tooltip.gif

    Fig.


3.8L Downstream Sensor

WARNING When disconnecting the sensor electrical connector, do not pull directly on wire going into sensor.
  1. Disconnect negative battery cable.
  2. Raise and support vehicle.
  3. Disconnect the electrical connector.
  4. Use a socket such as a crowfoot wrench to remove oxygen sensor.

3.8L Upstream & Downstream Sensors

NOTE When replacing an O2 Sensor, the PCM RAM memory must be cleared, either by disconnecting the PCM C-1 connector or momentarily disconnecting the Battery negative terminal. The NGC learns the characteristics of each O2 heater element and these old values should be cleared when installing a new O2 sensor. The customer may experience driveability issues if this is not performed.
  1. After removing the sensor, the threads must be cleaned with an 18 mm X 1.5 + 6E tap. If reusing the original sensor, coat the sensor threads with an anti-seize compound such as Loctite 771- 64 or equivalent. New sensors have compound on the threads and do not require an additional coating. Tighten the sensor to 28 Nm (20 ft. lbs.) torque.
  2. Connect the heated oxygen sensor electrical connector.
  3. Connect the negative battery cable.

3.8L Upstream Sensor

WARNING When disconnecting the sensor electrical connector, do not pull directly on wire going into sensor.
  1. Disconnect negative battery cable.
  2. Disconnect the upper O2 sensor connector.
  3. Use a socket such as a crowfoot wrench to remove oxygen sensor.

    0996b43f80202385.jpg enlarge_icon.gifenlarge_tooltip.gif

    Fig.


    0996b43f80202386.jpg enlarge_icon.gifenlarge_tooltip.gif

    Fig.


To Install:


Testing


NOTE Allow the O2 Sensor to cool down before conducting the test. The O2 Sensor voltage should stabilize at 5.0 volts. Raising the hood may help in reducing under hood temps quicker.

  1. Turn the ignition on, engine not running. With the scan tool, actuate the O2 Heater Test.
  2. With the scan tool, monitor O2 Sensor voltage for at least 2 minutes. Does the O2 Sensor voltage stay above 4.5 volts- If so, sensor is normal.
  3. If voltage does not stay above 4.5v as indicated, check wiring and connectors. Check O2 sensor for contamination.
  4. If wiring from the O2 sensor is damaged, DO NOT repair it; replace the O2 sensor.
  5. Turn the ignition off. Allow the O2 sensor to cool down to room temperature.
  6. Disconnect the O2 Sensor harness connector.
  7. Measure the resistance across the O2 Sensor Heater element component side. Resistance for either O2 Sensor should be 2.1-2.7 ohms.
  8. If the O2 Sensor is not within range, turn the ignition off.
  9. Disconnect the O2 Sensor harness connector. Turn the ignition to ON; engine not running.
  10. With the proper scan tool, actuate the O2 Heater Test.
  11. Using a 12-volt test light connected to ground, probe the O2 Heater Control circuit in the O2 Sensor harness connector.
  12. If the test light illuminates brightly and flashes on and off, replace the O2 Sensor.
  13. Confirm the repair with the appropriate Verification Test.
  14. Turn the ignition off.
  15. Disconnect the O2 Sensor harness connector.
  16. Disconnect the PCM harness connector.
  17. Measure the resistance between ground and the O2 Heater Control circuit in the O2 Sensor harness connector.
  18. Is the resistance below 5.0 ohms- If yes, repair the short to ground in the O2 Sensor Heater Control circuit. If resistance is okay, go to step 20.
  19. Confirm the repair.
  20. If resistance was okay when measured in step 17, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.
  21. If the resistance is still not within specified range, replace and program the Powertrain Control Module in accordance with the service information.
  22. Confirm the repair.

Jul 13, 2012 | 2004 Chrysler Pacifica

1 Answer

Had p code 1167 b1 s1 on and off for a couple of days, now ihave misfire code for cylinders 2 4 6 and running very poor as you would know checked plugs and wires ( ok ) ignition wires are mixed on the...


This has nothing to do with the O2 sensor, this is the A/F sensor in the exhaust manifold

DTC P1167: A/F Sensor (Sensor 1) Heater System Malfunction

NOTE: If DTC P1162 is stored at the same time as DTC P1167, troubleshoot DTC P1162 first, then troubleshoot DTC P1167.

Reset the ECM/PCM.
Start the engine. Wait for at least 80 seconds . Is DTC P01167 indicated? YES - Go to step 3. NO - Intermittent failure, system is OK at this time. Check for poor connections or loose wires at C102 (located under the under-hood fuse/relay box), the A/F Sensor relay, the A/F Sensor (Sensor 1), and the ECM/PCM.
Disconnect the A/F Sensor 4P connector, and ECM/PCM connector C (31P).

Connect ECM/PCM connector terminals C14 and C15 to body ground with a jumper wire.

Check for continuity between A/F Sensor (Sensor 1) 4P connector terminal No.1, No.2, and body ground individuality. Is there continuity? YES - Replace the A/F Sensor (Sensor 1). NO - Repair open or short in the wire between the A/F Sensor (Sensor 1) and the ECM/PCM (C14 or C15).

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ECM I fuse keeps blowing in my 1996 1 ton gmc sierra 4x4 with a 454 v8 engine whats causing it


For the ECM 1 fuse to open you obviously have a short to ground , start with the injector disconnected and see if ECM 1 fuse still blows.If it does disconnect crank sensor, also inspect wires for the injectors or any rub through wires here is a diagram cansmo_178.gif

Sep 09, 2011 | 1999 GMC Sierra 3500

1 Answer

I just replaced the O2 sensor behind the cat on the passenger side. I was told to check the fuse as well. The truck is a 2006 GMC Sierra 2500 HD. I have no idea what fuse needs to be checked. I can't...


there isn't a seperate fuse for the o2 sensors as such, they are controlled by the PCM. The fuses are listed on the inside of the box under the hood.

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1 Answer

My 96 ford ws 3.8 flashes code 52 also #4 cyl misfire i replaced coilpack, sparkplugs,sparkplugwires,egr valve, diff.feedback pressure sensor and i still get misfire in the #4 cyl. it runs good at first...


Yes. The Code 52 means the O2 sensor on Bank 2 Sensor 1 (Before Converter) has high resistance. These sensors can have a heating element in them to get the temperature up to 750 degrees which is suppose to help detect the fuel ratio in the burnt exhaust gases more effectively.

The sensors have a ground and are controlled by the ECM or PCM. Since your overdrive switch is affecting the operation of #4 cylinder, the PCM-powertrain control module connectors or wiring also uses a ground to make the O2 sensor work with the PCM supplying power. The switching occurs inside the PCM.

The problem with #4 cylinder may be related to the O2 sensor shorting the PCM. Replacing the O2 sensor before the Bank 2 converter would be a good start. Then check the wiring and connectors and ground for both the Overdrive switch, PCM, and O2 sensor. You want to have the wiring straightened out before changing the PCM and frying the new one.

I hope you have found my solution very helpful in solving your problem. Remeber to clear the trouble Code after installing the new O2 sensor.

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1 Answer

Check Engine light code P0432


P0432 - Main Catalyst Efficiency Below Threshold Bank 2
The ECM or PCM monitors the front an rear O2 sensors. The ECM or PCM detects Warm up Catalytic Converter when the sensors are out of specifications.

DTC is set when the ECM or PCM detects rear HO2S value difference becomes closer to value of front HO2S. The ECM or PCM monitors when vehicle speed is 25-60 MPH, load is 22-45 percent and engine speed is 1000-3000 RPM.

Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)

Possible causes
- Warm Up Three Way Catalytic converter deterioration or malfunction. - Exhaust system leaks. - Loose front or rear HO2Ss. - Front HO2S malfunction. - O2 sensors harness or connectors

Possible solution
- Replaced Catalytic Converter - Replaced rear O2 sensor - Repair wire harness or connectors

Check it ans tell us news.

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1 Answer

1998 gmc Sierra Engine light comes on and says O2 sensors. Replaced all sensors. Next day the light comes back on and says O2 sensors. What causes them to blow?


Hi, there are a number of trouble codes associated with the O2 sensors. Some indicate a sensor failure and others indicate a different problem. Can you tell me the trouble code you are getting?

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What does the 44 code mean on a 95 gmc 5.7 tbi truck


Code 44
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How do you reset the computer on a 98 gmc sierra


One way is to remove any fuses that say ECM/PCM in the fuse block and let them out for 20 minutes or more and another way is to disconnect the negitive battery cable and touch it too the positive. or pull all the connectors off the pcm.

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1 Answer

1998 GMC sierra 5.7 warms up to violent shut down


I Would Look Into ECM Probled As It Takes over when the Engine reaches 195-220 Deg the ECM Takes Charge of Timing ETC.

Jan 31, 2009 | 1998 GMC Sierra

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