Toyota's Valve Body problem?
01-07-2004, 01:22 PM
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Toyota's Valve Body problem?
I just came upon something that is very interesting ... to me.
Toyota issued a TSB (EG025-02) Title: M.I.L. "ON" DTC P0770 for all '02 4Runner and Tacoma V6 vehicles. The Introduction reads as follows:
Some owners of 2002 model year 4Runner vehicles and Tacoma trucks equiped 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 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 occuring.
The then go on to list the specific VINs that this applies to.
THIS IS A WARRANTY ITEM under the emissions and powertrain limitations.
I think this is the tip of an iceberg because to me this all translates to LOAD = TORQUE = LOAD and that is what we are introducing when we install a Supercharger. Therefore the the valve body is a weak link --- I can hear "I told you so" coming from the techi's.
So, where do we go from here to help our cause with superchargers? Surely, the pre-2002 tranny's were not any more durable than the '02's?
Toyota issued a TSB (EG025-02) Title: M.I.L. "ON" DTC P0770 for all '02 4Runner and Tacoma V6 vehicles. The Introduction reads as follows:
Some owners of 2002 model year 4Runner vehicles and Tacoma trucks equiped 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 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 occuring.
The then go on to list the specific VINs that this applies to.
THIS IS A WARRANTY ITEM under the emissions and powertrain limitations.
I think this is the tip of an iceberg because to me this all translates to LOAD = TORQUE = LOAD and that is what we are introducing when we install a Supercharger. Therefore the the valve body is a weak link --- I can hear "I told you so" coming from the techi's.
So, where do we go from here to help our cause with superchargers? Surely, the pre-2002 tranny's were not any more durable than the '02's?
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