Canada - Engine Controls/A/T - MIL ON/DTC P0770 Shift Solenoid

Bulletin
1186

Issue Date
2003-02-03

Reference
EE-02-015

Model
Tundra

Year Range
2002

Market
Canada

Component
EE

Subject:
M.I.L. "ON" DTC P0770

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 Solenoid "E" Malfunction) stored when operated under the following specific operating conditions:
- Operation in ambient temperatures above 32°C or 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

APPLICABLE VEHICLES:
- 2002 model year Tundra trucks equipped with V6 engines and 2WD automatic transmissions produced BEFORE the Production Change Effective below.







PRODUCTION CHANGE INFORMATION:







PARTS INFORMATION:







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 32�C 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 ETAS or 2002 Tundra Repair Manual DTC P0770 for Diagnostic Chart to repair vehicle.

2. Check ECM Part Number
Is ECM (PCM) Part Number 89661-0C462 (2WD)?
If YES - TSB already performed - refer to ETAS or 2002 Tundra Repair Manual DTC P0770 for 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 64 km/h or 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 ETAS for 2002 Tundra Repair Manual, [5VZ-FE].

4. Replace ECM (PCM) with new ECM (PCM).
5. Replace Valve Body. (Refer to ETAS or 2002 Tundra Repair Manual, Automatic Transmission Section.)
6. Test drive and confirm lockup operation and no recurrence of DTC P0770.







REPAIR TIME:

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.