Jeep Grand Cherokee WK. Manual — part 1447
P2767-INPUT SPEED SENSOR 2 CIRCUIT NO SIGNAL (CONTINUED)
4.
CHECK THE (T13) SENSOR GROUND CIRCUIT FOR AN OPEN
Measure the resistance of the (T13) Sensor Ground circuit from the
TCM C2 harness connector to the Electrohydraulic Control Unit
Assembly harness connector.
Is the resistance below 5.0 ohms?
Yes
>> Repair the (T13) Sensor Ground circuit for an open.
Perform NAG1 TRANSMISSION VERIFICATION TEST -
VER 1.
No
>> Go To 5
5.
CHECK THE (T71) INPUT SPEED SENSOR 2 (N3) SIGNAL CIRCUIT FOR A SHORT TO ANOTHER
CIRCUIT(S)
Measure the resistance of the (T71) Input Speed Sensor 2 (N3) Signal
circuit to all the other circuits in the Electrohydraulic Control Unit
Assembly harness connector.
Is the resistance below 5.0 ohms between the (T71) Input Speed
Sensor 2 (N3) Signal circuit and any other circuit(s) in the Elec-
trohydraulic Control Unit Assembly harness connector?
Yes
>> Repair the (T71) Input Speed Sensor 2 (N3) Signal circuit
for a short to another circuit(s).
Perform NAG1 TRANSMISSION VERIFICATION TEST -
VER 1.
No
>> Go To 6
21 - 598
AUTOMATIC TRANSMISSION NAG1 - ELECTRICAL DIAGNOSTICS
WK
P2767-INPUT SPEED SENSOR 2 CIRCUIT NO SIGNAL (CONTINUED)
6.
CHECK THE (T71) INPUT SPEED SENSOR 2 (N3) SIGNAL CIRCUIT FOR A SHORT TO GROUND
Measure the resistance between ground and the (T71) Input Speed
Sensor 2 (N3) Signal circuit.
Is the resistance below 5.0 ohms?
Yes
>> Repair the (T71) Input Speed Sensor 2 (N3) Signal circuit
for a short to ground.
Perform NAG1 TRANSMISSION VERIFICATION TEST -
VER 1.
No
>> Go To 7
7.
CHECK THE (T13) SENSOR GROUND CIRCUIT FOR A SHORT TO ANOTHER CIRCUIT(S)
Measure the resistance between the (T13) Sensor Ground circuit to all
the other circuits in the Electrohydraulic Control Unit Assembly har-
ness connector.
Is the resistance below 5.0 ohms between the (T13) Sensor
Ground circuit and any other circuit(s) in the Electrohydraulic
Control Unit Assembly harness connector.
Yes
>> Repair the (T13) Sensor Ground circuit for a short to
another circuit(s)
Perform NAG1 TRANSMISSION VERIFICATION TEST -
VER 1.
No
>> Go To 8
WK
AUTOMATIC TRANSMISSION NAG1 - ELECTRICAL DIAGNOSTICS
21 - 599
P2767-INPUT SPEED SENSOR 2 CIRCUIT NO SIGNAL (CONTINUED)
8.
CHECK THE (T13) SENSOR GROUND CIRCUIT FOR A SHORT TO GROUND
Measure the resistance between ground and the (T13) Sensor Ground
circuit.
Is the resistance below 5.0 ohms?
Yes
>> Repair the (T13) Sensor Ground circuit for a short to
ground.
Perform NAG1 TRANSMISSION VERIFICATION TEST -
VER 1.
No
>> Go To 9
21 - 600
AUTOMATIC TRANSMISSION NAG1 - ELECTRICAL DIAGNOSTICS
WK
P2767-INPUT SPEED SENSOR 2 CIRCUIT NO SIGNAL (CONTINUED)
9.
CHECK THE INPUT SPEED SENSOR 2 (N3) SIGNAL
Reconnect the Electrohydraulic Control Unit Assembly harness con-
nector.
Using a Lab Scope, backprobe the (T71) Input Speed Sensor 2 (N3)
Signal circuit at the TCM C2 harness connector.
WARNING: Properly support the vehicle.
Raise all drive wheels off the ground.
Start the engine.
WARNING: To avoid personal injury or death, keep hands and
feet clear of rotating wheels.
Place gear selector in drive and increase vehicle speed to engage 2nd
gear.
Compare the scope pattern on the Lab
Scope with a typical 5-volt square wave pat-
tern.
Is the scope pattern comparable to the
typical
5-volt
square
wave
signal
scope pattern?
Yes
>> Using
the
schematics
as
a
guide, check the Transmission
Control Module (TCM) pins, ter-
minals, and connectors for cor-
rosion,
damage,
or
terminal
push out. Pay particular atten-
tion to all power and ground cir-
cuits. If no problems are found,
replace the TCM per the Ser-
vice Information. Refer to 8 -
ELECTRICAL/ELECTRONIC
CONTROL MODULES/TRANS-
MISSION CONTROL MODULE
for the appropriate service pro-
cedure.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
No
>> Replace the Input Speed Sensor 2 (N3). Refer to 21- AUTOMATIC TRANSMISSION-AUTOMATIC
TRANSMISSION NAG1/SERVICE INFORMATION for the appropriate service procedure.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
10.
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 NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
No
>> Test Complete.
WK
AUTOMATIC TRANSMISSION NAG1 - ELECTRICAL DIAGNOSTICS
21 - 601
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