Jeep Grand Cherokee WK. Manual — part 1360
P0988-4C PRESSURE SWITCH RATIONALITY (CONTINUED)
15.
#5 AND/OR #7 CHECK BALL CUT OR DAMAGED
Turn the Ignition off to the lock position.
Remove the Valve Body Assembly per the Service Information.
Inspect the #5 and #7 check balls for any cuts or damage.
Inspect the 4C accumulator piston and seals and also the 4C tower seal on top of the valve body. Refer to the
Service Information.
Where there any problems found?
Yes
>> Repair as necessary. Check for excessive clutch debris in the transmission oil pan. If excessive clutch
debris is present, repair 4C clutch as necessary. Refer to the Service Information for proper repair pro-
cedures.
Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1.
No
>> Go To 16
16.
EXCESSIVE FLUID LEAKAGE WITH 4C CLUTCH CIRCUIT
Air check the 4C Clutch hydraulic circuit. Refer to the Service Information.
NOTE: This hydraulic clutch circuit contains a small bleed orifice. Small leakage is considered normal.
Was there excessive air leakage in the 4C Clutch hydraulic circuit?
Yes
>> Repair as necessary. Refer to the Service Information.
Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1.
No
>> Replace the Transmission Solenoid/TRS Assembly per the Service Information.
Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1.
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AUTOMATIC TRANSMISSION 545RFE - ELECTRICAL DIAGNOSTICS
WK
P1684-BATTERY WAS DISCONNECTED
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 ignition is in the Run/Start position.
•
Set Condition:
This DTC will set whenever Powertrain Control Module is disconnected from Fused B+ or ground. It will also
be set during the DRBIII
T
Battery Disconnect and/or Quick Learn procedure.
Possible Causes
BATTERY WAS DISCONNECTED
SCAN TOOL BATTERY DISCONNECT PERFORMED
PCM WAS REPLACED OR DISCONNECTED
QUICK LEARN WAS PERFORMED
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 PCM uses a battery backed RAM (Random Access Memory) is used to maintain some learned values. When
the battery B(+) is disconnected, the memory is lost. When the B(+) is restored, this memory loss is detected by the
Transmission Control System. The DTC is set and the learned values are initialized to known constants or previ-
ously learned values from EEPROM (Electronic Erasable Programmable Read Only Memory). This results in the
reinitialization of some parameters.
Diagnostic Test
1.
POSSIBLE CAUSES
This DTC is an informational DTC only.
This DTC is set due to a momentary loss of power and/or the ground circuits to the PCM.
Below are a list of possible causes associated with this DTC.
Battery was disconnected.
The BATTERY DISCONNECT feature on the scan tool was performed.
The QUICK LEARN feature on the scan tool was performed.
PCM was replaced or disconnected.
Were any of the above possible causes performed?
Yes
>> This is the cause of the DTC. Erase the DTC and return vehicle to customer.
Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1.
No
>> Go To 2
WK
AUTOMATIC TRANSMISSION 545RFE - ELECTRICAL DIAGNOSTICS
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P1684-BATTERY WAS DISCONNECTED (CONTINUED)
2.
INTERMITTENT WIRING AND CONNECTORS
The conditions necessary to set this DTC are not present at this time.
Using the schematics as a guide, inspect the wiring and connectors specific to this circuit.
NOTE: Check all power and ground circuits to the PCM for a intermittent or high resistance condition.
Wiggle the wires while checking for shorted and open circuits.
With the scan tool, check the EATX DTC EVENT DATA to help identify the conditions in which the DTC was set.
Where there any problems found?
Yes
>> Repair as necessary.
Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1.
No
>> Test Complete.
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AUTOMATIC TRANSMISSION 545RFE - ELECTRICAL DIAGNOSTICS
WK
P1715-RESTRICTED MANUAL VALVE IN T3 RANGE
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 PRNDL code indicates Temp3.
•
Set Condition:
This DTC sets when conditions for the DTC P1776 are satisfied or 3 unsuccessful attempts to engage 1st gear
while the shifter is in the temp3 zone. This indicates a restricted port at the manual valve because the shifter
is not fully engaged in the drive position.
Possible Causes
RELATED TRANSMISSION DTC’S PRESENT
CUSTOMER DRIVING HABITS
MISADJUSTED SHIFTER
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 21 - TRANSMIS-
SION/TRANSAXLE/AUTOMATIC - 45RFE/545RFE - DIAGNOSIS AND TESTING).
Diagnostic Test
1.
DETERMINING IF RELATED DTC’S ARE PRESENT
With the scan tool, check for other transmission DTC’s
Are any of the following DTC’s P0731, P0732, P0733, P0734, P1736 or P0715 present?
Yes
>> Refer to the Transmission category and perform the appropriate symptom.
Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1.
No
>> Go To 2
2.
CHECK SHIFTER ADJUSTMENT
Check Shifter adjustment per the Service Information.
Is the shifter properly adjusted?
Yes
>> Go To 3
No
>> Adjust the Shifter Assembly per the Service Information.
Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1.
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AUTOMATIC TRANSMISSION 545RFE - ELECTRICAL DIAGNOSTICS
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