Engine Controls/A/T - MIL ON/DTC P0770 Shift Solenoid
ENGINEEG024-02
Title:
M.I.L. "ON" DTC P0770
Models:
'02 Tundra V6
December 23, 2002
Introduction
Some owners of 2002 model year Tundra trucks equipped with V6 engines and automatic transmissions may experience a M.I.L. "ON" condition with DTC P0770 (Shift Solenoid "E" Malfunction) stored when operated under the following specific operating conditions:
^ Operation in ambient temperatures above 90°F.
^ When towing a trailer or carrying a heavy load.
^ When climbing a long uphill grade.
The ECM logic (SAE term: Powertrain Control Module/PCM) has been revised and the transmission valve body has been improved to prevent this condition from occurring.
Applicable Vehicles
2002 model year Tundra trucks equipped with V6 engines and automatic transmissions produced BEFORE the Production Change Effective VIN shown below.
Production Change Information
Warranty Information
Applicable warranty *
^ R & R ECM (PCM) repair is covered under the Toyota Federal Emissions Warranty. This warranty is in effect for 96 months or 80,000 miles, whichever occurs first, from the vehicle's in-service date for ECM (PCM).
^ R & R of the Valve Body is covered under the Toyota Powertrain Warranty. This warranty is in effect for 60 months or 60,000 miles, whichever occurs first, from the vehicle's in-service date.
* Warranty application is limited to correction of a problem based upon a customer's specific complaint.
Parts Information
Required SSTs
NOTE:
Additional Diagnostic Tester Kits, Program Cards or SSTs may be ordered by calling SPX/OTC at 1-800-933-8335.
Required Tools & Material
Repair Procedure
Verify Vehicle Condition
1. Did M.I.L. "ON" DTC P0770 occur under any one of the following conditions?
A. Operation of vehicle in ambient temperatures above 90°F.
B. While towing or carrying a heavy load
C. While climbing a long uphill grade.
If YES - go to STEP 2.
If NO - TSB does not apply - refer to TIS or 2002 Tundra Repair Manual DTC P0770 Diagnostic Chart to repair vehicle.
2. Check ECM Part Number
Is ECM (PCM) Part Number 89661-0C462 (2WD) or 89661-0C372(4WD)?
If YES - TSB already performed - refer to TIS or 2002 Tundra Repair Manual
DTC P0770 Diagnostic Chart to repair vehicle.
If NO - Go to Step 3.
3. Perform Active Test of lockup Solenoid (SL Solenoid or Solenoid "E") using Diagnostic Tester.
A. Set up Diagnostic Tester (see Figure 1).
B. Drive vehicle to a speed above 40 mph.
C. Maintain constant throttle input and speed while using Active Test of SL Solenoid on Diagnostic Tester (see Figure 2).
D. When SL Solenoid is turned "ON" torque converter should lock up within 5 seconds and engine rpm should drop 100-200 rpm.
E. When SL Solenoid is turned "OFF" engine rpm should rise 100-200 rpm within 5 seconds.
F. Repeat several times to confirm proper operation of SL Solenoid/torque converter.
If SL Solenoid operation/torque converter lockup operation is normal - GO TO Step 4.
If SL Solenoid operation/torque converter lockup does not occur, takes excessive time, or rpm drop is insufficient - Follow diagnostics on TIS for DTC P0770 or 2002 Tundra Repair Manual.
4. Replace ECM (PCM) with new ECM (PCM). (Refer to TIS or 2002 Tundra Repair Manual, SF1 Section [5VZ-FE).)
5. Replace Valve Body. (Refer to TIS or 2002 Tundra Repair Manual, Automatic Transmission Section.)
6. Test drive and confirm lockup operation and no recurrence of DTC P0770.