January 01, 2013

U140/U240/U241 Diagnostic Information

Valve Body Xpress

Binding On 1-2 Shift

To determine if you have a valve body/solenoid problem or a faulty ECM, determine if you have Reverse with the electrical connector disconnected from the transmission. If you DON'T have Reverse, suspect B2 control valve is stuck on or pushed to apply position by cross leaks or DSL solenoid stuck open.

If transmission engages in Reverse, suspect faulty ECM. The DSL solenoid (TCC) doesn't just come on for lockup. It also energizes in manual low and to inhibit Reverse. It's normally closed & when energized allows oil pressure to stroke B2 control valve and apply B2 clutch in manual low and block oil to the B2 clutch in Reverse.

If DSL is stuck open in Drive, B2 clutch applies in first like it does in manual low. When 1-2 shift occurs with B2 clutch applied, too many clutches are applied and the transmission binds up. If DSL is stuck open in Reverse, B2 control valve blocks oil to B2 clutch inhibiting Reverse.

The ECM (Engine Control Module) aka PCM (Powertrain Control Module) controls engine and transmission. It's not uncommon for RAV4 models between 2001-2003 to have faulty ECMs. Many times they have binding/harsh shifts and produce codes P0750, P0753, P0755, P0758 and P1760. See Toyota bulletin #TC002-06 dated March 3, 2006.

NOTE: This is an adaptive learn transmission. Learned adapts must be reset after overhaul or valve body replacement to avoid damage. It resets all ECM learned adapts, not just transmission adapts. A Toyota factory scanner can reset ECM adapts. After resetting adapts, bring transaxle to operating temp and drive vehicle at light steady throttle through all shifts. Repeat until shifts feel normal. You may find that resetting shift adapts will correct binding on shifts, therefore, perform reset before replacing an ECM.

Solenoid Firing Order

Gear
SL1
SL2
S4
DSL/TCC*
1st
On
On
Off
2nd
Off
On
Off
3rd
Off Off Off
3rd, TCC On
Off Off Off On
4th
Off Off On

4th, TCC On
Off Off On
On
Manual 1st
On
On
Off On
* DSL/TCC Solenoid is turned on to inhibit reverse

2-3 Slip/Flare-Delayed/No Reverse

Direct clutch sealing rings wear into ring grooves of cover and direct drum can be ring grooved. Clearance between sealing ring and ring land is .003"-.005". Direct drums with damage where sealing rings ride should be replaced. DON'T try to salvage drum by sanding. Another cause of pressure loss is missing/incorrectly placed washer seal between case and rear cover.

Slips In Reverse/No Reverse

In addition to direct clutch issues, a DSL solenoid stuck "on," a B2 control valve stuck in stroked position and missing or damaged B2 seals between valve body and case can cause reverse to delay, slip or miss altogether.

Various Shift & Engagement Feel Concerns

Can be due to accumulator spring mix up. Please see chart for correct information.

NOTE:
  • C1 accumulator is for N-D engagement.
  • C3 accumulator is for 3-4 shift.
  • B3 accumulator affects 4-3 downshift.

Accumulator Spring Chart

Type
Location
Color
Free Length
Dia. No. of Coils
Wire Dia.
C1
Case-side
Red
3.555"
.727"
14.5
.075"
C3 Outer
VB-side
White
3.645"
.738"
14
.117"
C3 Inner
VB-side
Plain
.470"
.450"
3
.078"
B3 Outer
Case-side Blue
2.945"
.856"
10
.098"
B3 Inner
Case-side Green
2.370"
.625"
12
.085"
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