Jeep Grand Cherokee WK. Manual - part 1368

P2703- INADEQUATE ELEMENT VOLUME UD

For the Transmission circuit diagram (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - 45RFE/545RFE -
SCHEMATICS AND DIAGRAMS)

For a complete wiring diagram Refer to Section 8W.

•

When Monitored:
Whenever the engine is running. The UD clutch volume index (CVI) is updated during a 4-3 kickdown with
throttle angle between 10 and 54 degrees. Transmission temperature must be at least 43° C (110° F).

•

Set Condition:
When the UD CVI falls below 11.

Possible Causes

BROKEN UD ACCUMULATOR SPRING(S)

BROKEN UD CLUTCH PISTON SPRING OR DISLODGED SNAP RING

INTERNAL LEAKAGE IN PUMP OR VALVE BODY ASSEMBLIES

TRANSMISSION SOLENOID/TRS ASSEMBLY

POWERTRAIN CONTROL MODULE

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 21 - TRANSMIS-
SION/TRANSAXLE/AUTOMATIC - 45RFE/545RFE - DIAGNOSIS AND TESTING).

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 DTC’s, which indicates an internal transmission problem.

Diagnostic Test

OTHER DTCS PRESENT

With the scan tool, check for other transmission DTCs.

Are there any Pressure Switch Sense circuit DTCs present also?

Yes

>> Refer to the Transmission category and perform the appropriate symptom.

Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1.

>> Go To 2

CHECK UD CLUTCH VOLUME INDEX

With the scan tool, erase Transmission DTCs.

NOTE: The TRANS TEMP DEG must be at least 43° C or 110° F before performing the following steps.
Drive the vehicle and perform at least ten 4-3 kickdowns by depressing the throttle between 30 and 54 TPS degrees
at speeds about 80 Kmh or 50 MPH.

With the scan tool, read the UD clutch volume index (CVI).

Is the UD CVI below 10?

Yes

>> Go To 3

>> Go To 5

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AUTOMATIC TRANSMISSION 545RFE - ELECTRICAL DIAGNOSTICS

P2703- INADEQUATE ELEMENT VOLUME UD (CONTINUED)

UD CLUTCH CIRCUIT LEAKS IN THE VALVE BODY

Turn the ignition off to the lock position.

Remove the transmission oil pan and valve body per the Service Information.

Check the condition of the UD accumulator springs.

Look for possible leak paths into the UD clutch hydraulics circuit within the valve body.

Were there any problems found?

Yes

>> Repair as necessary.

Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1.

>> Go To 4

AIR CHECK UD CLUTCH CIRCUIT

Perform an air check on the UD Clutch circuit per the Service Information.

Watch and listen for UD Clutch piston movement.

Air check all other pump passages for air leakage into the UD Clutch circuit.

Were any problems found?

Yes

>> Repair internal transmission. Pay attention to components related to the UD clutch. Broken or weak

return spring or a dislocated snap ring. If no trouble is found in UD clutch component or UD clutch
leakage was noted in passage, replace the Pump Assembly.

Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1.

>> Replace the Transmission/TRS Solenoid Assembly per the service information. With the scan tool, per-

form Quick Learn.

Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1.

VERIFY PCM OPERATION

NOTE: The TRANS TEMP DEG must be at least 43° C or 110° 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 Kmh or 50 MPH, then brake lightly to a stop. Turn off engine.

With the scan tool, record the clutch volume index (CVI) for all clutches.

With the scan tool, perform a BATTERY DISCONNECT.

With the scan tool, read the CVI’s and compare them to the readings recorded before the BATTERY DISCONNECT.

Are any of the CVI’s less than 5 or different than before the BATTERY DISCONNECT?

Yes

>> Using the schematics as a guide, check the Powertrain Control Module (PCM) terminals for corrosion,

damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems
are found, replace the PCM per the Service Information. With the scan tool, perform QUICK LEARN.

Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1.

>> Test Complete.

AUTOMATIC TRANSMISSION 545RFE - ELECTRICAL DIAGNOSTICS

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P2704-INADEQUATE ELEMENT VOLUME 4C

For the Transmission circuit diagram (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - 45RFE/545RFE -
SCHEMATICS AND DIAGRAMS)

For a complete wiring diagram Refer to Section 8W.

•

When Monitored:
Whenever the engine is running. The 4C clutch volume index (CVI) is updated during a 3-4 upshift with throttle
angle between 10 and 54 degrees. Transmission temperature must be at least 43° C (110° F).

•

Set Condition:
When the 4C CVI falls below 5.

Possible Causes

BROKEN 4C RETURN SPRING OR DISLODGED SNAP RING

BROKEN 4C ACCUMULATOR SPRING(S)

HYDRAULIC LEAK IN THE VALVE BODY

TRANSMISSION SOLENOID/TRS ASSEMBLY

POWERTRAIN CONTROL MODULE

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 21 - TRANSMIS-
SION/TRANSAXLE/AUTOMATIC - 45RFE/545RFE - DIAGNOSIS AND TESTING).

Theory of Operation

Diagnostic Test

CHECK THE 4C CLUTCH VOLUME

With the scan tool, record the 4C clutch volume index (CVI) and erase DTC’s.

Perform at least 10, 3-4 upshifts with the throttle between 10 and 54 degrees. The Transmission temperature must
be at least 43° C or 110° F.

With the scan tool, read the 4C CVI.

Is the current 4C CVI below 10?

Yes

>> Go To 2

>> Go To 5

DTC P0876 PRESENT

With the scan tool, read DTCs.

NOTE: The DTC P0876 must also be set with P2704 in order for this test to be valid.

Is the DTC P0876 also present?

Yes

>> Replace the Transmission Solenoid/TRS Assembly per the Service Information.

Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1.

>> Go To 3

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AUTOMATIC TRANSMISSION 545RFE - ELECTRICAL DIAGNOSTICS

P2704-INADEQUATE ELEMENT VOLUME 4C (CONTINUED)

4C 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 4C accumulator springs.

Look for possible leak paths into the 4C clutch hydraulics circuit within the valve body.

Were any problems found?

Yes

>> Repair as necessary.

Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1.

>> Go To 4

AIR CHECK 4C CLUTCH CIRCUIT

Perform an air check on the 4C Clutch circuit per the Service Information.

Listen for proper 4C Clutch piston movement.

Were any problems found?

Yes

>> Repair Internal transmission as necessary. Pay attention to the mechanical components related to the

4th clutch. A broken or weak return spring or a dislocated snap ring could cause this problem.

Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1.

>> Replace the Transmission Solenoid/TRS Assembly per the service information. With the scan tool, per-

form Quick Learn.

Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1.

VERIFY PCM OPERATION

Perform eight learnable starts. A learnable start is defined as follows: Start engine. From a standstill, accelerate
lightly to 50 MPH, then brake lightly to a stop. Turn off engine.

With the scan tool, record Transmission CL VOL INDEX (CVI) for all clutches.

With the scan tool, perform a BATTERY DISCONNECT.

With the scan tool, read the CVI’s and compare them to the reading recorded before the BATTERY DISCONNECT.

Are any of the CVI’s less than 5 or are they different than before the battery disconnect?

Yes

>> Using the schematics as a guide, check the Powertrain Control Module (PCM) terminals for corrosion,

Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1.

>> Test Complete.

AUTOMATIC TRANSMISSION 545RFE - ELECTRICAL DIAGNOSTICS

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