Jeep Grand Cherokee WK. Manual — part 1315
P0720-OUTPUT SPEED SENSOR CIRCUIT (CONTINUED)
3.
OUTPUT SPEED SENSOR SIGNAL CIRCUIT OPEN
Turn the ignition off to the lock position.
Disconnect the Transmission Simulator, Miller tool #8333.
Disconnect the PCM harness connectors and connect Miller special
tool #8815.
CAUTION: Do not probe the PCM harness connectors. Probing
the PCM harness connectors will damage the PCM terminals
resulting in poor terminal to pin connection. Install Miller special
tool #8815 to perform diagnosis..
Measure the resistance of the Output Speed Sensor Signal circuit from
the Output Speed Sensor harness connector to the appropriate termi-
nal of special tool #8815.
Is the resistance above 5.0 ohms?
Yes
>> Repair the Output Speed Sensor Signal circuit for an
open.
Perform 45RFE/545RFE TRANSMISSION VERIFICATION
TEST - VER 1.
No
>> Go To 4
4.
SPEED SENSOR GROUND CIRCUIT OPEN
Measure the resistance of the Speed Sensor Ground circuit from the
Output Speed Sensor harness connector to the appropriate terminal in
the special tool #8815.
Is the resistance above 5.0 ohms?
Yes
>> Repair the Speed Sensor Ground circuit for an open.
Perform 45RFE/545RFE TRANSMISSION VERIFICATION
TEST - VER 1.
No
>> Go To 5
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AUTOMATIC TRANSMISSION 545RFE - ELECTRICAL DIAGNOSTICS
WK
P0720-OUTPUT SPEED SENSOR CIRCUIT (CONTINUED)
5.
OUTPUT SPEED SENSOR SIGNAL CIRCUIT SHORT TO GROUND
Measure the resistance between ground and the Output Speed Sensor
Signal circuit.
Is the resistance below 5.0 ohms?
Yes
>> Repair the Output Speed Sensor Signal circuit for a short
to ground.
Perform 45RFE/545RFE TRANSMISSION VERIFICATION
TEST - VER 1.
No
>> Go To 6
6.
SPEED SENSOR GROUND CIRCUIT SHORT TO GROUND
Measure the resistance between ground and the Speed Sensor
Ground circuit.
Is the resistance below 5.0 ohms?
Yes
>> Repair the Speed Sensor Ground circuit for a short to
ground.
Perform 45RFE/545RFE TRANSMISSION VERIFICATION
TEST - VER 1.
No
>> Go To 7
WK
AUTOMATIC TRANSMISSION 545RFE - ELECTRICAL DIAGNOSTICS
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P0720-OUTPUT SPEED SENSOR CIRCUIT (CONTINUED)
7.
OUTPUT SPEED SENSOR SIGNAL CIRCUIT SHORT TO VOLTAGE
Remove the Transmission Control Relay.
Place a jumper wire between the Fused B+ circuit and the Transmis-
sion Relay Output circuit in the Transmission Control Relay connector.
Ignition on, engine not running.
Measure the voltage of the Output Speed Sensor Signal circuit.
Is the voltage above 0.5 volts?
Yes
>> Repair the Output Speed Sensor Signal circuit for a short
to voltage.
Perform 45RFE/545RFE TRANSMISSION VERIFICATION
TEST - VER 1.
No
>> Go To 8
8.
SPEED SENSOR GROUND CIRCUIT SHORT TO VOLTAGE
Measure the voltage of the Speed Sensor Ground circuit.
Is the voltage above 0.5 volts?
Yes
>> Repair the Speed Sensor Ground circuit for a short to volt-
age.
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.
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AUTOMATIC TRANSMISSION 545RFE - ELECTRICAL DIAGNOSTICS
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P0720-OUTPUT SPEED SENSOR CIRCUIT (CONTINUED)
9.
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 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.
Were there any problems found?
Yes
>> Repair as necessary.
Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1.
No
>> Test Complete.
WK
AUTOMATIC TRANSMISSION 545RFE - ELECTRICAL DIAGNOSTICS
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