Engine Controls - MIL ON/DTC P0751 Set
L-SB-0076-09Rev1
July 9, 2009
MIL "ON" DTC P0751
Service Category
Drivetrain
Section
Automatic Transmission/Transaxle
Market
USA
Applicability
TSIB REVISION NOTICE
May 13, 2010 Rev1:
^ Parts Information has been updated with additional parts (oxygen sensor).
Any previous printed versions of this service bulletin should be discarded.
Introduction
Some 2006 model year GS 300 vehicles may exhibit a MIL "ON" condition with DTC P0751 stored (Shift Solenoid "A" Performance). DTCs P2714 or P0894 may also be stored. The Engine Control Module/ECM (SAE term: Powertrain Control Module/PCM) detection logic for DTC P0751 has been revised to prevent false detection of P0751 and erroneous MIL "ON".
To properly address this condition two different repair procedures are provided. Carefully review the Repair Procedure Overview below and all steps of this bulletin BEFORE beginning any repair.
Repair Procedure Overview
1. Confirm stored DTCs and verify vehicle condition matches this bulletin.
2. Verify calibration ID to determine if this repair has already been performed.
3. Determine if Repair Procedure A or B should be performed.
^ Repair Procedure A:
Replace ECM (PCM), rear oxygen sensors, and update ECM (PCM) calibration (as necessary).
^ Repair Procedure B:
Update ECM (PCM) calibration ONLY
Warranty Information
Parts Information
Calibration Identification Chart
Required Tools & Equipment
Verification Procedure
1. Using TIS Techstream check for DTC(s) stored in the ECM (PCM).
2. Confirm that DTC P0751 (Shift Solenoid "A" Performance - Shift Solenoid 51) is stored as a current DTC.
3. Check the Freeze Frame Data for each DTC stored to confirm which DTC(s) set first.
HINT
^ The DTC that is stored first will have 5 frames of Freeze Frame Data stored (see Figures 1 and 2).
^ On vehicles with the original ECM (PCM) installed in the vehicle, 5 frames of Freeze Frame Data (titled -3, -2, -1, 0, and +1) will NOT be present and review of FFD values may not confirm which DTC set first.
Does P0751 have 5 frames of Freeze Frame Data?
^ YES - Go to step 4.
^ NO - This TSIB does NOT apply if a DTC other than P0751 has 5 frames of Freeze Frame Data. Refer to the Repair Manual and follow diagnostics for the first stored or primary DTC (the DTC with 5 frames of Freeze Frame Data).
If NO DTC has 5 frames of Freeze Frame Data - Go to step 4.
4. Clear all codes and test drive vehicle. Monitor vehicle during test drive and confirm if abnormal shifting or a MIL "ON" occurs.
Did abnormal shifting occur or did a MIL turn "ON" during the test drive?
^ YES - This TSIB does NOT apply. Use Techstream to confirm DTCs and follow Repair Manual diagnostic method for primary DTC, or refer to the Repair Manual for diagnostic method based on shifting abnormality observed during the test drive.
^ NO - Go to step 5.
5. Refer to the Health Check information in Techstream and confirm if the CAL ID matches the "Previous Calibration ID" or "New Calibration ID" listed in the Calibration Information chart in this TSIB.
Does the calibration ID in the ECM (PCM) match the New Calibration ID listed in this TSIB?
^ YES - The recalibration in this bulletin has been previously performed. Refer to the Repair Manual for diagnosis.
^ NO - Refer to the Calibration Information Chart to determine if Repair Procedure A or B applies.
HINT
If an Authorized Modifications Label is affixed to the vehicle in the location shown in Figure 3, this can assist in determining which Repair Procedure is applicable.
Repair Procedure A
1. Confirm the calibration ID is applicable based on the Calibration Identification Chart in this bulletin.
2. Replace both rear oxygen sensors.
Refer to the Technical Information System (TIS) 2006 model year GS 300 Repair Manual:
3. Replace the ECM (PCM).
Refer to TIS 2006 model year GS 300 Repair Manual:
4. Follow the procedures outlined in TSIB No. EG012-04, "Entering VIN During ECM (PCM) Replacement and/or DTC P0630," and write the VIN to the ECM (PCM).
NOTE
The new ECM (PCM) may be equipped with an OLD calibration ID.
5. Check the ECM calibration ID and flash reprogram the ECM (PCM) if necessary.
^ Refer to Repair Procedure B for the ECM (PCM) reprogramming procedure.
6. The repair is complete. Test drive the vehicle to confirm normal operation.
Repair Procedure B
1. Confirm the calibration ID is applicable based on the Calibration Identification Chart in this bulletin.
2. Check for the Authorized Modifications Label affixed to the vehicle in the location shown in Figure 4. Confirm if the ECM (PCM) calibration has been updated. If the calibration ID listed is NOT the latest ECM (PCM) calibration - go to step 3.
3. Flash Reprogram the ECM (PCM).
NOTE
^ The GR8 Battery Diagnostic Station MUST be used in Power Supply Mode to maintain battery voltage at 13.5 volts while flash reprogramming the vehicle.
^ For details on how to use the GR8 Battery Diagnostic Station, refer to the located on the Technical Information System (TIS), Diagnostics - Battery.
Follow the procedures outlined in TSIB No. L-SB-0015-10, "Techstream ECU Flash Reprogramming Procedure� and flash the ECM (PCM) with the NEW calibration file update.
4. Install the Authorized Modifications Label.
A. Using a permanent marker enter the following information on the label:
^ ECM part number [Refer to the Parts In formation section for the CURRENT PART NUMBER]
^ Calibration ID(s) [Refer to the Calibration Identification Chart for the NEW CALIBRATION ID]
^ Dealer Code
^ Repair Date
^ Change Authority [This TSIB number]
B. Affix the Authorized Modifications Label to the vehicle at the location shown in Figure 4. The Authorized Modifications Label is available through the MDC P/N 00451-00001-LBL.
5. The repair is complete. Test drive the vehicle to confirm normal operation.