Instruments - High/Low Erratic Oil Pressure Readings
File In Section: 06 - Engine/Propulsion SystemBulletin No.: 04-06-04-065
Date: September, 2004
ADVANCED SERVICE INFORMATION
Subject:
ENGINEERING INVESTIGATION (EI # 04073) - High, Low or Erratic Oil Pressure Gauge Reading Setting DTCs P0522 and/or P0523
Models:
2004 Chevrolet Avalanche, Express, Silverado, Tahoe, Suburban
2004 GMC Savana, Sierra, Yukon, Yukon XL
2004 Isuzu W4
Equipped with 6.0L Engine ONLY (VIN Code U - RPO L04)
Attention:
GM of Canada dealers are not authorized to utilize this service bulletin.
Condition
Important:
This bulletin only applies to those vehicles identified in GM VIS by Engineering Investigation number 04073 AND the customer's concern is for an erratic gauge reading and DTC P0522 or P0523 is set. All other vehicles should not use this bulletin. If GM VIS shows an EI 04073 is open for this vehicle but the customer does not comment on an erratic gauge reading, DO NOT perform this bulletin.
The customer may comment about a high, low or erratic oil pressure gauge reading and the engine oil pressure indicator being illuminated. The technician will find DTCs P0522 and/or P0523 stored in the PCM. The PCM displays this information in the "Failure Records" on the scan tool.
Cause
GM Engineering is attempting to determine the root cause of Oil Pressure Sensor replacements. General Motors has a need to obtain technical information first hand from the dealer technician BEFORE and during diagnosis and repair. As a result, this information will be used by Engineering to help "root-cause" the customer's concern and develop/validate a field fix.
Important:
^ By using the Tech 2, obtain the engine oil pressure sensor voltage reading. It is important to have this information PRIOR to contacting the engineer.
^ All U.S. Dealers, please contact engineer Brian Kozumplik. BEFORE proceeding. If Brian can not be reached immediately, leave a message with the VIN, Dealer Name, Dealer Phone Number, Caller's Name and Voltage Reading. Then proceed with the following corrective action.
Correction
Follow the diagnostic procedures for P0522 and/or P0523, found in SI.
If the SI diagnostics did not isolate the concern, OR if it leads to an oil pressure sensor connection concern, perform the following steps:
1. Cut off the oil pressure sensor wire harness 25.4 mm (1 in) from the connector.
Important:
Do NOT disconnect the sensor from the connector.
2. Remove the oil pressure sensor with the 25.4 mm (1 in) of harness and connector still connected.
3. Install a new oil pressure sensor using the one listed in the GMSPO parts catalog.
4. Repair the harness by installing an oil pressure sensor connector harness kit, P/N 12102748. This kit comes with a connector, attached leads and Duraseal splice sleeves. DO NOT solder the circuits when installing this service kit. Soldering the splice can impact the performance of the circuit. Instead, use the included splice sleeves and follow the procedure below:
4.1. Open the harness.
- If the harness is taped, remove the tape.
- To avoid wiring insulation damage, use a sewing ripper in order to cut open the harness.
- If the harness has a black plastic conduit, pull out the desired wire.
4.2. Cut the wire.
- Cut as little wire off the harness as possible.
- Ensure that each splice is at least 40 mm (1.5 in) away from other splices, harness branches and connectors. This helps prevent moisture from bridging adjacent splices and causing damage.
4.3. Select the proper size and type of wire.
- The wire must be of equal or greater size than the original.
- The wire's insulation must have the same or higher temperature rating (4). Use general purpose insulation for areas that are not subject to high temperatures. Use a cross-linked polyethylene insulated wire for areas where high temperatures are expected.
Important:
^ Use cross-linked polyethylene wire to replace PVC, but do not replace cross-linked polyethylene with PVC.
^ Cross-linked polyethylene wire is not fuel resistant. Do not use to replace wire where there is the possibility of fuel contact.
4.4. Strip the insulation.
- Select the correct size opening in the wire stripper or work down from the largest size.
- Strip approximately 7.5 mm (5/16 in) of insulation from each wire to be spliced (1).
4.5. Select the proper Duraseal splice sleeve (2) and the required crimp nest tool. Refer to the Crimp and Seal Splice Table.
4.6. Place the Duraseal splice sleeve in the J 38125-8 crimp tool nest so that the crimp falls at point 1 on the splice.
4.7. Close the hand crimper handles slightly in order to hold the duraseal splice sleeve firmly in the proper crimp tool nest.
4.8. Insert the wires into the Duraseal splice sleeve until the wire hits the barrel stop. The splice sleeve has a stop in the middle of the barrel in order to prevent the wire from passing through the splice (3).
4.9. Close the handles of the J 38125-8 until the crimper handles open when released. The crimper handles will not open until the proper amount of pressure is applied to the splice sleeve.
4.10. Shrink the insulation around the splice.
- Using the heat torch, apply heat to the crimped area of the barrel.
- Gradually move the heat barrel to the open end of the tubing. The tubing will shrink completely as the heat is moved along the insulation. A small amount of sealant will come out of the end of the tubing when sufficient shrinkage is achieved.
5. Bubble wrap and ship the oil pressure sensor with connector intact, to:
GM Powertrain Engineering
823 Joslyn Avenue
Mail Code: 480-730-452
Pontiac, MI 48340
Attention: Tom McCausland - DRE
Important:
If a Parts Waiver is required, contact Brian Kozumplik.
Parts Information
Parts are currently available from GMSPO.
Warranty Information
For vehicles repaired under warranty, use the table.
Disclaimer