Jeep Grand Cherokee WK. Manual — part 1356
P0958-AUTOSTICK CIRCUIT HIGH (CONTINUED)
4.
CHECK THE (T5) AUTOSHIFT UP/DOWN SENSE CIRCUIT FOR A SHORT TO VOLTAGE
Ignition on, engine not running.
Measure the voltage of the (T5) AutoStick Up/Down Sense circuit.
Is the voltage above 0.5 volts?
Yes
>> Repair the (T5) AutoStick Up/Down Sense circuit for a
short to voltage.
Perform 45RFE/545RFE TRANSMISSION VERIFICATION
TEST - VER 1.
No
>> Go To 5
5.
CHECK THE (T5) AUTOSHIFT UP/DOWN SENSE CIRCUIT FOR A SHORT TO ANOTHER CIRCUIT
Turn the ignition off to the lock position.
Measure the resistance between the (T5) AutoStick Up/Down Sense
circuit and all other circuits in the Shift Lever Assembly harness con-
nector.
Is the resistance below 5.0 ohms between the (T5) AutoStick
Up/Down Sense circuit and any other circuit(s) in the Shift
Lever Assembly harness connector.
Yes
>> Repair the (T5) AutoStick Up/Down Sense circuit for a
short to another circuit(s).
Perform 45RFE/545RFE TRANSMISSION VERIFICATION
TEST - VER 1.
No
>> Go To 6
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AUTOMATIC TRANSMISSION 545RFE - ELECTRICAL DIAGNOSTICS
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P0958-AUTOSTICK CIRCUIT HIGH (CONTINUED)
6.
CHECK THE AUTOSTICK SWITCH
Reconnect the PCM C2 and C3 harness connectors.
Connect a jumper wire between (T5) AutoStick Up/Down Sense circuit
and (K900) Sensor Ground circuit in the Shift Lever Assembly harness
connector.
Ignition on, engine not running.
With the scan tool, read the AutoStick voltage.
Did the scan tool AutoStick voltage drop below 0.5 volts?
Yes
>> Replace the Shift Lever Assembly per the Service Informa-
tion.
Perform 45RFE/545RFE TRANSMISSION VERIFICATION
TEST - VER 1.
No
>> 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.
7.
CHECK THE AUTOSTICK VOLTAGE WHILE SHIFTING
Start the engine in park.
With the brakes firmly applied, shift into AutoStick.
With the scan tool, monitor the AutoStick voltage while shifting both low and high.
Did the scan tool AutoStick voltage rise above 4.75 volts at any given time?
Yes
>> Replace the Shift Lever Assembly per the Service Information.
Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1.
No
>> Go To 8
8.
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.
Wiggle the wiring and connectors while checking for any possible open or shorted circuits.
Check for any Service Information Tune-ups or Technical Service Bulletins that may apply.
Were 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
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P0987-4C HYDRAULIC PRESSURE TEST
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AUTOMATIC TRANSMISSION 545RFE - ELECTRICAL DIAGNOSTICS
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P0987-4C HYDRAULIC PRESSURE TEST (CONTINUED)
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:
In any forward gear with engine speed above 1000 RPM shortly after a shift and every minute thereafter.
•
Set Condition:
After a shift into a forward gear, with engine speed above 1000 RPM, the PCM momentarily turns on element
pressure to the Clutch circuits that don’t have pressure to identify the correct Pressure Switch closes. If the
Pressure Switch does not close 2 times, the DTC sets.
Possible Causes
LINE PRESSURE SENSOR
TRANSMISSION FLUID CONTAMINATION
RELATED DTC’S PRESENT
TRANSMISSION SOLENOID/TRS ASSEMBLY
EXCESSIVE DEBRIS IN OIL PAN
POOR LINE PRESSURE SENSOR CONNECTION
TRANSMISSION CONTROL RELAY DTCS PRESENT
(T48) 4C PRESSURE SWITCH SENSE CIRCUIT OPEN
(F856) 5-VOLT SUPPLY CIRCUIT OPEN
(T48) 4C PRESSURE SWITCH SENSE CIRCUIT SHORT TO GROUND
(F856) 5-VOLT SUPPLY CIRCUIT SHORT TO GROUND
(T48) 4C PRESSURE SWITCH SENSE CIRCUIT SHORT TO OTHERS
TRANSMISSION SOLENOID/TRS ASSEMBLY
INTERNAL TRANSMISSION
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 Transmission Control System tests the pressure switches when they are off. The test verifies that the switches
are operational (They will close with pressure applied). The Transmission Control System verifies that the switch
closes when the corresponding element is applied. If a switch fails to close, it is re-tested. If it fails the second test,
the DTC will set, the MIL will illuminate and the transmission system will default to the orderly Shutdown routine.
Diagnostic Test
1.
DETERMINING IF RELATED DTC’S ARE PRESENT
With the scan tool, check for other transmission DTC’s
Is there any Loss of Prime, Transmission Control Relay, and/or Line Pressure Sensor DTCs present?
Yes
>> Refer to the Transmission category and perform the appropriate symptom. If the DTC P0944 is present,
perform its respective test first.
Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1.
No
>> Go To 2
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AUTOMATIC TRANSMISSION 545RFE - ELECTRICAL DIAGNOSTICS
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