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Diagnostic Procedure

WARNING: This page is about a different car, the 2005 Jeep Liberty. However, it is still accessible from the selected car via links, so may be relevant.
DIAGNOSTIC TEST REFERENCE - P0725-ENGINE SPEED SENSOR CIRCUIT - DIESEL

TEST ACTION APPLICABILITY
1 With the DRBIII®, Check the STARTS SINCE SET counter.
NOTE: This counter only applies to the last DTC set.

Is the STARTS SINCE SET set at 0?
Yes --> Go To 2
No --> Go To 7		 All
2 Turn the ignition off to the lock position.
Disconnect the TCM harness connector.
Disconnect the ECM harness connector.
NOTE: Check connectors - Clean/repair as necessary.

Measure the resistance of the Engine Speed Signal circuit from the TCM harness connector to the ECM harness connector.
Is the resistance above 5.0 ohms?
Yes --> Repair the Engine Speed Signal Circuit circuit for an open.
Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1 .
No --> Go To 3		 All
3 Turn the ignition off to the lock position.
Disconnect the TCM harness connector.
Disconnect the ECM harness connector.
NOTE: Check connectors - Clean/repair as necessary.

Measure the resistance between ground and the Engine Speed Signal circuit.
Is the resistance below 5.0 ohms?
Yes --> Repair the Engine Speed Signal circuit for a short to ground.
Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1 .
No --> Go To 4		 All
4 Turn the ignition off to the lock position.
Disconnect the TCM harness connector.
Disconnect the ECM harness connector.
NOTE: Check connectors - Clean/repair as necessary.

Ignition on, engine not running.
Measure the voltage of the Engine Speed Signal circuit in the TCM harness connector.
Is the voltage above 10.5 volts?
Yes --> Repair the Engine Speed Signal circuit for a short to voltage.
Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1 .
No --> Go To 5		 All
5 Turn the ignition switch to the lock position.
Replace and Program the Transmission Control Module per the Service Information.
Start the engine and allow the engine to idle for 6 minutes.
Did the P0725 DTC return?
Yes --> Go To 6
No --> Test complete.
Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1 .		 All
6 Using the schematics as a guide, inspect the wiring and connectors. Pay particular attention to corroded terminals and all power and ground circuits. Repair as necessary.
If there are no possible causes remaining, view repair.
Repair
Replace and program the Engine Control Module per the Service Information. After completion of Engine Verification test make sure to Perform Transmission Verification Test.
Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1 .		 All
7 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 shorts and open circuits.
With the DRBIII®, check the EATX 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.		 All
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