Canada - Engine Controls - ECM Update
Bulletin
TSB2792
Issue Date
July 19, 2007
Market
Canada
Title
ECM CALIBRATION: ENHANCEMENT TO SHIFTING PERFORMANCE & SMOOTHNESS
Component
ENGINE ELECTRICAL
Models
'05 Avalon
INTRODUCTION:
To enhance shifting performance and smoothness during acceleration, the Engine Control Module/ECM (SAE term: Powertrain Control Module/PCM) calibration has been revised and certain fuel control feedback components have been updated. Please use the following procedure to address customer concerns.
NOTE:
Before proceeding, verify the ECM (PCM) calibration has NOT been updated by checking for the Authorized Modifications Label (shown in Figure 11 of the Repair Procedure).
APPLICABLE VEHICLES:
- 2005 model year Avalon vehicles.
CALIBRATION IDENTIFICATION CHART:
NOTE:
Vehicles that have been flash reprogrammed using this TSB will contain upgraded 2007 model year OBD II Logic. Refer to the Technical Information System (TIS), 2007 model year Avalon Repair Manual when checking Powertrain Diagnostic Trouble Codes (DTCs).
WARRANTY INFORMATION:
PARTS INFORMATION:
NOTE:
- The ECM (PCM) should NOT be replaced as part of the repair procedure.
- Authorized Modification Labels may be ordered in packages of 25 from your facing PDC.
REQUIRED SSTs:
REPAIR PROCEDURE:
Replace Fuel Control Feedback Components
1. Disconnect the bank 1 and bank 2 front pipe assembly from the exhaust manifolds.
A. Remove the heated oxygen sensors.
a. Disconnect the 2 heated oxygen sensor (bank 1 and 2, sensor 2) connectors.
b. Remove the 2 heated oxygen sensors (bank 1 and 2, sensor 2).
B. Remove the front exhaust pipe No. 1 support brackets by removing the 2 nuts.
C. Remove the rear exhaust pipe No. 1 support bracket by removing the 2 bolts.
D. Remove the exhaust pipe assembly front. (See Figure 1.)
a. Remove the 2 nuts from the exhaust pipe front (left bank exhaust manifold side).
b. Remove the 2 bolts from the exhaust pipe front (right bank exhaust manifold side).
c. Remove the 2 nuts and 2 bolts from the exhaust pipe front (exhaust pipe center side). Then remove the exhaust pipe front.
d. Remove the 3 gaskets from the exhaust pipe front.
E. Remove the exhaust pipe assembly center.
a. Remove the 4 nuts from the 2 exhaust pipe tails.
b. Disconnect the 2 exhaust pipe supports and remove the exhaust pipe center.
c. Remove the 2 gaskets from the exhaust pipe center.
d. Remove the 2 bolts from the exhaust pipe damper.
2. Remove the exhaust manifold sub-assembly RH (bank 1).
A. Disconnect the A/F sensor connector clamp.
B. Uniformly loosen and remove the 6 nuts.
C. Remove the manifold and gasket.
D. Remove the A/F sensor from the manifold and reinstall it into the NEW bank 1 manifold.
3. Install the NEW exhaust manifold sub-assembly RH.
A. Install a NEW gasket as shown in Figure 3.
B. Install the exhaust manifold sub-assembly RH with the 6 nuts.
Torque: 21 N-m (214 kgf-cm, 15 ft-lbf)
4. Remove the exhaust manifold sub-assembly LH.
A. Disconnect the bank 2 A/F sensor connector clamp.
B. Remove the oil level gauge guide sub-assembly.
a. Remove the oil level gauge.
b. Remove the 2 bolts, and the oil level gauge guides No. 1 and No. 2.
c. Remove the O-rings from the oil level gauge guide.
C. Remove the manifold stay No. 2 by removing the 2 bolts.
D. Remove the exhaust manifold heat insulator No. 2 by removing the 3 bolts.
E. Remove the exhaust manifold sub-assembly LH.
a. Uniformly loosen and remove the 6 nuts.
b. Remove the manifold and gasket.
F. Remove the bank 2 A/F sensor and reinstall it into the NEW bank 2 A/F manifold.
5. Install the NEW exhaust manifold sub-assembly LH.
A. Install a NEW gasket as shown in Figure 8.
B. Install the exhaust manifold sub-assembly RH with the 6 nuts.
Torque: 21 N-m (214 kgf-cm, 15 ft-lbf)
C. Install the manifold stay No. 2.
D. Install the oil level gauge sub-assembly.
6. Install the exhaust pipe assembly front.
A. Install 3 NEW gaskets to the exhaust pipe fronts.
B. Install the exhaust pipe front to the exhaust manifolds with the 2 nuts and 2 bolts.
Torque: 62 N-m (632 kgf-cm, 46 ft-lbf)
C. Install the exhaust pipe front to the exhaust pipe center with the 2 nuts and 2 bolts.
Torque: 56 N-m (571 kgf-cm, 41 ft-lbf)
7. Replace the sub oxygen sensors.
A. Install the heated oxygen sensor.
a. Install the 2 heated oxygen sensors (bank 1 and 2, sensor 2).
Torque: 44 N-m (449 kgf-cm, 32 ft-lbf)
b. Connect the 2 heated oxygen sensor (bank 1 and 2, sensor 2) connectors.
B. Check for exhaust gas leaks. If gas IS leaking, tighten the areas necessary to stop the leak. Replace damaged parts as necessary.
8. Replace the vacuum switching valve No. 1 assembly.
Recalibrate ECM (PCM)
1. Check for the Authorized Modifications Label affixed to the vehicle in the location shown in Figure 1. Confirm if the ECM (PCM) calibrations have been updated. If the calibration IDs are NOT the latest calibrations - go to step 2.
2. Flash Reprogram the ECM (PCM).
NOTE:
The Midtronics Battery charger MUST be used in Power Supply Mode to maintain battery voltage at 13.5 volts while flash programming the vehicle.
Follow the procedures outlined in TSB2758 "Techstream ECU Flash Reprogramming Procedure," and flash the ECM (PCM) with the NEW calibration file update.
3. Start the engine and warm it up to normal operating temperature before test-driving.
4. Test-drive the vehicle to confirm proper vehicle operation (and proper laser cruise control operation, if so equipped).
5. Install the Authorized Modifications Label.
A. Using a permanent marker, enter the following information on the label:
- ECM (PCM) part number: [Refer to the Parts Information 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 TSB number): 2792
B. Affix the Authorized Modifications Label to the vehicle at the location shown in Figure 1. The Authorized Modifications Label is available through the MDC, P/N 00451-00001-25.
6. Calibration update is complete.
NOTE:
The effect of the new calibration may become more apparent after several days of driving as the ECM (PCM) "learned values" are re-established from the customer's driving.
NOTE:
Issue of this Technical Service Bulletin is to ensure that proper repair information is available. IT DOES NOT CONSTITUTE AN AUTHORIZATION FOR REPAIR. Normal provisions of the formal warranty policy, as applicable, will apply.