Chrysler PT Cruiser 2001 Service Manual Supplement page 2793

P0720-OUTPUT SPEED SENSOR ERROR —
TEST
7 Turn ignition off to the lock position.
Disconnect the TCM harness connector.
Disconnect the TRS harness connector.
Note: Check connectors - Clean/repair as necessary.
Measure the resistance between the Output Speed Sensor Signal circuit and ground.
Is the resistance Below 5.0 ohms?
Yes → Repair Output Speed Sensor Signal circuit short to ground.
→ Go To 8
No
8 Turn ignition off to the lock position.
Disconnect the TCM harness connector.
Disconnect the Transmission Simulator.
Remove the Transmission Control Relay from the PDC.
Note: Check connectors - Clean/repair as necessary.
Connect a jumper wire between the Fused B(+) and Transmission Control Relay
Output circuits in the Transmission Control Relay connector (In PDC).
Ignition on, engine not running.
Measure the voltage of the Output Speed Sensor Signal circuit in the TCM connector.
Is the voltage above 3.0 volts?
Yes → Repair Output Speed Sensor Signal circuit short to voltage.
→ Go To 9
No
9 Turn ignition off to the lock position.
Disconnect the TCM harness connector.
Disconnect the TRS harness connector.
Remove the Transmission Control Relay from the PDC.
Note: Check connectors - Clean/repair as necessary.
Connect a jumper wire between the Fused B(+) and Transmission Control Relay
Output circuits in the Transmission Control Relay connector (In PDC).
Ignition on, engine not running.
Measure the voltage of the Speed Sensor Ground circuit in the TCM connector.
Is the voltage above 3.0 volts?
Yes → Repair Speed Sensor Ground circuit short to voltage.
→ Go To 10
No
10 If there are no possible causes remaining, replace the TCM.
View repair options.
Repair
11 The conditions necessary to set the 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 shorts and open circuits.
Were any problems found?
Yes → Repair wiring and/or connector as necessary.
→ Test Complete.
No
ACTION
Perform 41TE TRANSMISSION VERIFICATION TEST - VER 1.
Perform 41TE TRANSMISSION VERIFICATION TEST - VER 1.
Perform 41TE TRANSMISSION VERIFICATION TEST - VER 1.
Replace the TCM.
Perform 41TE TRANSMISSION VERIFICATION TEST - VER 1.
Perform 41TE TRANSMISSION VERIFICATION TEST - VER 1.
Continued
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TRANSMISSION
APPLICABILITY
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