What to do with my tranny problem???

[firedog]

I have a 97 with the 4l60 unfortunately. When it gets warm it loses overdrive. Ive changed fluid and filter numerous times all with no signs of metal or any material in the pan. Could this be most likely cause by a bad valve body or o-ring? I have a spare tranny to put in but im lazy as the day is long and would rather spend $75 instead of a couple hours to swap.

 

[blueflamed03]

I have composed a wonderful response to totally fix your issue, but too tired to type it out at this time.
















get my point

 

[firedog]

thanks lol

 

[Kolt-46]

Any time that I see "Tranny problem" I get concerned that it's not automotive related. I'm glad that wasn't the case!

 

[firedog]

always a possibility i guess

 

[SunlitComet]

Have you had it scanned for stored or active codes that do not activate the dash light?

 

[firedog]

yes, but its always the 1870

---------- Post added at 03:09 PM ---------- Previous post was at 03:08 PM ----------

i have borrowed a diagnostic scan tool and watched the solenoid activation and they appeared to be correct didnt get too much more in depth with it than that though

 

[SunlitComet]

Print this out so you have for later in case you want to get really in-depth:

DTC P1870 Transmission Component Slipping (1 Of 4)

DTC P1870 Transmission Component Slipping (2 Of 4)

DTC P1870 Transmission Component Slipping (3 Of 4)

DTC P1870 Transmission Component Slipping (4 Of 4)

Component Diagnosis

Transmission Component





CIRCUIT DESCRIPTION
The Vehicle Control Module (VCM) monitors the difference between engine speed and transmission output speed. In D3 drive range with the Torque Converter Clutch (TCC) engaged, the engine speed should closely match the transmission output speed. In D4 drive range, with the TCC engaged, the TCC slip speed should be -20 to +20 RPM.

When the VCM detects excessive TCC slip when the TCC should be engaged, then DTC P1870 sets. DTC P1870 is a type A DTC.

CONDITIONS FOR SETTING THE DTC
The following conditions are met for three TCC cycles with reported excessive TCC slip conditions.

• No Throttle Position (TP) DTCs P0122 or P0123.
• No VSS Assy. DTC P0502.
• No Transmission Fluid Temperature (TFT) Sensor DTCs P0712 or P0713.
• No 1-2 Shift Solenoid Valve (1-2 SS Valve) DTCs P0751 or P0753.
• No 2-3 Shift Solenoid Valve (2-3 SS Valve) DTCs P0756 or P0758.
• No Transmission Fluid Pressure Valve Position Switch (TFP Val. Position Sw.) DTC P1810.
• No TCC Pulse Width Modulated Solenoid Valve (TCC PWM So. Valve) DTC P1860.
• No TCC Sol. Valve DTC P1864.
• The engine speed is greater than 400 RPM for 8 seconds.
• Not in fuel cutoff.
• The engine torque is 50-450 lb ft.
• The gear range is D4.
• Not in 1st gear.
• The TP angle is 9-35%.
• The TFT is 20-130°C (68-266°F).
• The TCC is ON for 5 seconds.
• The TCC is at maximum apply for 5 seconds.
• The TCC slip speed is greater than 130 RPM. All conditions met for 7 seconds.

ACTION TAKEN WHEN THE DTC SETS

• The VCM inhibits TCC engagement.
• The VCM commands maximum line pressure.
• The VCM inhibits 4th gear if the transmission is in hot mode.
• The VCM freezes shift adapts from being updated.
• The VCM illuminates the Malfunction Indicator Lamp (MIL).

CONDITIONS FOR CLEARING THE MIL/DTC

• The VCM turns OFF the MIL after three consecutive ignition cycles without a failure reported.
• A scan tool can clear the DTC from the VCM history. The VCM clears the DTC from the VCM history if the vehicle completes 40 warm-up cycles without a failure reported.
• The VCM cancels the DTC default actions when the fault no longer exists and the ignition is OFF long enough in order to power down the VCM.

DIAGNOSTIC AIDS
Internal transmission failures could set a DTC P1870.

TEST DESCRIPTION
The numbers below refer to the Step numbers on the diagnostic table.

Step (#3) tests the torque converter for slippage while in a commanded lock-up state.

 

[firedog]

ok

 

[Donnie Yukonie]

servo valve had to replace mine in my first trans got it replaced with one from a corvette lets just say it was a lil stiffe lol