P2700-INADEQUATE ELEMENT VOLUME LR

For a complete wiring diagram Refer to Section 8W.

Theory of Operation


The volumes of the transmission fluid needed to apply the friction elements are continuously monitored and learned for adaptive controls. As the clutch friction material wears, the volume of fluid needed to apply the clutch increases. Certain transmission mechanical problems can cause near-zero learned volumes resulting in setting a DTC. The DTC will usually set with other DTCs, which indicates an internal transmission problem.



Possible Causes
HYDRAULIC LEAK IN THE VALVE BODY
BROKEN L/R CLUTCH PISTON RETURN SPRING OR SPRING RETAINERS
BROKEN L/R ACCUMULATOR SPRING(S)
TRANSMISSION SOLENOID/TRS ASSEMBLY
POWERTRAIN CONTROL MODULE

Always perform the 45RFE/545RFE Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - 45RFE/545RFE - STANDARD PROCEDURE)



Diagnostic Test

1. OTHER DTCS PRESENT

With the scan tool, check for other transmission DTCs.

Are there any Pressure Switch Sense circuit DTCs present also?

Yes


No

2. CHECK L/R CLUTCH VOLUME INDEX

With the scan tool, erase DTCs.
Start the engine and warm the transmission.

NOTE: The TRANS TEMP DEG must be at least 43 degrees C or 110 degrees F before performing the following steps.


Drive the vehicle and perform at least ten 3-1 manual downshifts at closed throttle from speeds of about 32 Km/h or 20 mph.
With the scan tool, read the L/R CL VOL INDEX.

Is the L/R CL VOL INDEX below 20?

Yes


No

3. L/R CLUTCH CIRCUIT LEAKS IN THE VALVE BODY

Turn the ignition off to the lock position.
Remove the transmission oil pan per the Service Information.
Remove the valve body per the service information.
Check condition of the L/R accumulator springs.
Look for possible leak paths into the L/R clutch hydraulics circuit within the valve body.

Were any problems found?

Yes


No

4. AIR CHECK L/R CLUTCH CIRCUITS

Perform an air check on the L/R Clutch circuit per the Service Information.
Watch and listen for L/R Clutch piston movement.

Does the L/R piston stroke and return properly?

Yes


No

5. VERIFY PCM OPERATION

NOTE: The TRANS TEMP DEG must be at least 43 degrees C (110 degrees F) before performing the following steps.


Perform eight learnable starts. A learnable start is defined as follows: Start engine. From a standstill, accelerate lightly to 80 Km/h or 50 mph, then brake lightly to a stop. Turn off engine.
With the scan tool, record the CL VOL INDEX (CVI) for all clutches
With the scan tool, perform a BATTERY DISCONNECT.
With the scan tool, read the CVIs and compare them to the readings recorded before the BATTERY DISCONNECT.

Are any of the CVIs less than 5 or different than before the BATTERY DISCONNECT?

Yes


No