Dodge Durango (HB). Manual — part 1247
P0720-OUTPUT SPEED SENSOR CIRCUIT (CONTINUED)
Diagnostic Test
1.
CHECK TO SEE IF DTC P0720 IS CURRENT
Turn the ignition off to the lock position.
CAUTION: Properly support the vehicle and raise all drive wheels off the ground.
Release the parking brake.
Start the engine in park.
Place the transmission gear selector in drive, release foot from brake.
WARNING: BE SURE TO KEEP HANDS AND FEET CLEAR OF ROTATING WHEELS.
With the scan tool, monitor the Output Speed Sensor RPM.
Is the Output Speed Sensor RPM below 100 RPM?
Yes
>> Go To 2
No
>> Go To 9
2.
OUTPUT SPEED SENSOR
Turn the ignition off to the lock position.
Remove the Starter Relay.
NOTE: Removal of the Starter Relay is to prevent a Transmission, NO RESPONSE, condition and disable the
starter.
Install the Transmission Simulator, Miller tool #8333.
NOTE: Check connectors - Clean/repair as necessary.
Ignition on, engine not running.
With the Transmission Simulator, set the selector switch to 3000/1000 and the Input/Output switch to ON.
With the scan tool, monitor the Input and Output Speed Sensor RPM
Does the Input Speed read 3000 RPM and the Output Speed read 1000 RPM, ± 50 RPM?
Yes
>> Replace the Output Speed Sensor per the Service Information.
Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1.
No
>> Go To 3
HB
AUTOMATIC TRANSMISSION 545RFE - ELECTRICAL DIAGNOSTICS
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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
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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
HB
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
HB
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