Jeep Grand Cherokee WK. Manual — part 1419
P0657-SOLENOID SUPPLY VOLTAGE CIRCUIT (CONTINUED)
2.
(T78) SOLENOID SUPPLY VOLTAGE CIRCUIT OPEN
Turn the ignition off to the lock position.
Disconnect the TCM C1 and C2 harness connectors.
Disconnect the Electrohydraulic Control Unit Assembly harness con-
nector.
Measure the resistance of the (T78) Solenoid Supply Voltage circuit
between the TCM C2 harness connector and the Electrohydraulic
Control Unit Assembly harness connector.
Is the resistance below 5.0 ohms?
Yes
>> Repair the (T78) Solenoid Supply Voltage circuit for an
open.
Perform NAG1 TRANSMISSION VERIFICATION TEST -
VER 1.
No
>> Go To 3
3.
(T78) SOLENOID SUPPLY VOLTAGE CIRCUIT SHORT TO GROUND
Measure the resistance between ground and the (T78) Solenoid Sup-
ply Voltage circuit.
Is the resistance below 5.0 ohms?
Yes
>> Repair the (T78) Solenoid Supply Voltage circuit for a
short to ground.
Perform NAG1 TRANSMISSION VERIFICATION TEST -
VER 1.
No
>> Go To 4
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AUTOMATIC TRANSMISSION NAG1 - ELECTRICAL DIAGNOSTICS
WK
P0657-SOLENOID SUPPLY VOLTAGE CIRCUIT (CONTINUED)
4.
(T78) SOLENOID SUPPLY VOLTAGE CIRCUIT SHORT TO ANOTHER CIRCUIT
Measure the resistance between the (T78) Solenoid Supply Voltage
circuit and all other circuits in the Electrohydraulic Control Unit Assem-
bly harness connector.
Is the resistance below 5.0 ohms between the (T78) Solenoid
Supply Voltage circuit and any other circuit(s) in the Electrohy-
draulic Control Unit Assembly harness connector?
Yes
>> Repair the (T78) Solenoid Supply Voltage circuit for a
short to another circuit(s).
Perform NAG1 TRANSMISSION VERIFICATION TEST -
VER 1.
No
>> Using the schematics as a guide, check the Transmission
Control Module (TCM) terminals for corrosion, damage, or
terminal push out. Pay particular attention to all power and
ground circuits. If no problems are found, replace the TCM
per the Service Information. Refer to 8 - ELECTRICAL/
ELECTRONIC
CONTROL
MODULES/TRANSMISSION
CONTROL MODULE for the appropriate service procedures.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
WK
AUTOMATIC TRANSMISSION NAG1 - ELECTRICAL DIAGNOSTICS
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P0710-TRANSMISSION TEMPERATURE SENSOR CIRCUIT
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AUTOMATIC TRANSMISSION NAG1 - ELECTRICAL DIAGNOSTICS
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P0710-TRANSMISSION TEMPERATURE SENSOR CIRCUIT (CONTINUED)
For the Transmission circuit diagram (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - NAG1 - SCHE-
MATICS AND DIAGRAMS)
For a complete wiring diagram Refer to Section 8W
Theory of Operation
The Electrohydraulic Control Unit Assembly of the NAG1 transmission contains a temperature sensor to monitor the
transmission oil temperature. This sensor is wired in series with the transmission Park/Neutral switch. The Trans-
mission Control Module (TCM) expects to see a valid voltage level from the sensor when the shifter is in Reverse
or any forward Drive position. The TCM also expects to see an open circuit condition when the shifter is in the Park
or Neutral position. When the controller detects an open circuit when in Reverse or any forward drive position the
DTC will set. Note: Due to a open circuit condition in Park or Neutral, the TCM substitutes the Transmission Tem-
perature reading with Engine Temperature when in Park or Neutral
•
When Monitored:
Continuously with the ignition on.
•
Set Condition:
When the TCM detects an open circuit when in Reverse or any forward drive position the DTC will set.
Possible Causes
SHIFT LEVER ASSEMBLY OUT OF ADJUSTMENT
(T54) TEMPERATURE SENSOR-P/N SWITCH SIGNAL CIRCUIT OPEN
(T54) TEMPERATURE SENSOR-P/N SWITCH SIGNAL CIRCUIT SHORT TO VOLTAGE
(T54) TEMPERATURE SENSOR-P/N SWITCH SIGNAL CIRCUIT SHORT TO OTHER CIRCUITS
(T54) TEMPERATURE SENSOR-P/N SWITCH SIGNAL CIRCUIT SHORT TO ANOTHER CIRCUIT(S)
SHIFT LEVER ASSEMBLY
TRANSMISSION CONTROL MODULE
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 21 - TRANSMIS-
SION/TRANSAXLE/AUTOMATIC - NAG1 - STANDARD PROCEDURE)
Diagnostic Test
1.
CHECK IF SPEED SENSOR DTCS ARE PRESENT
With the scan tool, read Transmission DTCs.
Are there any speed sensor DTCs present also?
Yes
>> Refer to the AUTOMATIC TRANSMISSION NAG1 - ELECTRICAL DIAGNOSTICS category and perform
the appropriate symptom.
No
>> Go To 2
2.
CHECK IF SHIFT LEVER ASSEMBLY SHIFT CABLE IS OUT OF ADJUSTMENT
Check the Shift Lever Assembly shift cable for proper adjustment. Refer to 21- AUTOMATIC TRANSMISSION-AU-
TOMATIC TRANSMISSION NAG1/SERVICE INFORMATION for the proper service procedures.
Is the Shift Lever Assembly shift cable properly adjusted?
Yes
>> Go To 3
No
>> Adjust the Shift Lever Assembly shift cable. Refer to 21- AUTOMATIC TRANSMISSION-AUTOMATIC
TRANSMISSION NAG1/SERVICE INFORMATION for the proper service procedure.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
WK
AUTOMATIC TRANSMISSION NAG1 - ELECTRICAL DIAGNOSTICS
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