The Pressure is Off - Transmission Digest

The Pressure is Off

Jon at Wilson Transmissions received a 2010 Venza with a 3.5L/U660E combo from a used car lot. All seemed to be working good other than many dash indicators lit up. After scanning the vehicle and finding pressure switch codes (P0872 for TFP Sensor/Switch C and P0877 for TFP Sensor/Switch D), Jon ordered a TFP switch/TFT sensor assembly from the Toyota dealer.

The Pressure is Off

Shift Pointers

Author: Wayne Colonna
Subject Matter: U660E
Issue: Pressure switch codes

Shift Pointers

  • Author: Wayne Colonna
  • Subject Matter: U660E
  • Issue: Pressure switch codes

Jon at Wilson Transmissions received a 2010 Venza with a 3.5L/U660E combo from a used car lot. All seemed to be working good other than many dash indicators lit up. After scanning the vehicle and finding pressure switch codes (P0872 for TFP Sensor/Switch C and P0877 for TFP Sensor/Switch D), Jon ordered a TFP switch/TFT sensor assembly from the Toyota dealer.

When the pressure switch assembly was removed from the valve body in the vehicle, it was noticed there was a single switch only present (Figure 1). The replacement switch from the dealer included all three switches (Figure 2).

It was also noticed that there were only 3 wires at the internal harness connector (Figure 3), when there should have been 5 wires (Figure 4).

Further inspection revealed blocked/missing passages through a VB cover plate to feed the missing switches (Figure 5), although the actual valve body feed passages were present (Figure 6).

It seems that around the time when the U660E went from being TCM controlled to PCM controlled in 2012 (perhaps the U760E as well), two of the three pressure switches were also eliminated. If a 2012 or later transmission is installed in anything earlier, you will have the same problem Jon at Wilson Transmissions was faced with.

The repair is simple; replace the entire valve body as an assembly with the correct VB cover plate, TFP switch/TFT sensor assembly and internal harness. The other alternative will be to modify what it by using the earlier five wire internal harness and 3 switch TFP switch/TFT Sensor assembly, provided that the large cover plate from an earlier assembly is also used (figures 7 and 8), or the later plate may be drilled using an earlier plate as a template.

You May Also Like

Sherlock Holmes Approach to an AB60 No-Move Situation

The effectiveness in diagnosing automatic transmission malfunctions is an art form. Although there are similarities among the wide varieties of transmissions on the road, each transmission has its own peculiarities. Aside from having mechanical, hydraulic, and electrical hardware systems to contend with, software/programming issues and various vehicle platforms make diagnostics much more difficult.  Using scopes provides

ab60

The effectiveness in diagnosing automatic transmission malfunctions is an art form. Although there are similarities among the wide varieties of transmissions on the road, each transmission has its own peculiarities. Aside from having mechanical, hydraulic, and electrical hardware systems to contend with, software/programming issues and various vehicle platforms make diagnostics much more difficult. 

GM 6T40 Pump Identification Guide

The 6T40 was introduced in 2008 for General Motors front-wheel-drive cars in the Chevrolet Malibu and has gone through several changes throughout its three generations, specifically in the pump area. The 6T40 is closely related to the more lightweight 6T30 and the heavier duty 6T45 and 6T50. Generation one started phasing out during the 2012

Seeing the Forest AND the Trees

They say that the proverbial phrase “I couldn’t see the forest for the trees” means that a person or organization cannot see the big picture because it focuses too much on the details. Related Articles – 4L60E Harsh 1-2 Shift – TASC Force Tips: Diagnosing 8L45 & 8L90 Shift Complaints – TASC Force Tips: Hydraulics

The Manifold Pipeway

The Honda six-speed transmission has been on the bench of many specialty shops for one reason or another (figure 1). But, for those of you who have yet to lay your hands on one, mounted on the upper side of the unit is one of the largest, if not the largest solenoid and pressure switch

8L90 Vacuum Testing

Below are the diagrams for vacuum testing GM 8L90 transmissions. Note: OE valves are shown in rest position and should be tested in rest position unless otherwise indicated. Test locations are pointed to with an arrow. Springs are not shown for visual clarity. A low vacuum reading indicates wear. For specific vacuum test information, refer

Other Posts

Shift Pointers: Where’s that fluid leak coming from?

A 2016 Honda CRV 2.4L (Figure 1), using a BLJA CVT 4WD transmission (Figure 2) comes in to a shop with a customer complaint of a leak. Related Articles – The torque converter can of worms: Lockup and aftermarket programming – The Subaru mystery burn – Multitasking: Sorting out multiple issues with the same vehicle

Ford 8F35 maintenance tips: Planetary failure and no-pressure conditions

Our shop has had several vehicles come in with the Ford 8F35 transmission having planetary failure. Apparently, there was a run where the pinion needle bearings had a hardness problem (see Figure 1). Related Articles – Chrysler RH/RE late shifts and high pressure – Ford 6R80 shift solenoid ‘E’ resistance change: How to tell the difference

Figure 12.
Shift Pointers: A Chrysler 300 no-shift complaint

The case study has to do with a 2009 Chrysler 300 C 5.7L Nag1 RWD with 71,923 miles on it (see Figure 1, above). Related Articles – How to get around non-serviceable GM 6T70/75 self-tapping pump screws – Shop Profile: AAction Transmissions begins a new era by trying to reach a new generation of customers

Shift Pointers: What to do when the 62TE TRS tab breaks

How frustrating it is when on a hot summer day, as you go to open a nice cold can of your drink of choice, and the tab breaks off? You are outside, away from any tools to remedy the problem quickly. It now requires a MacGyver mentality looking around at the resources available to get