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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 - P0123-TPS/APPS HIGH - DIESEL

TEST ACTION APPLICABILITY
1
NOTE: Low fluid level can be the cause of many transmission problems. If the fluid level is low locate and repair the leak then check and adjust the fluid level per the Service Information.
NOTE: Always perform diagnostics with a fully charged battery to avoid false symptoms.
With the DRBIII®, read the engine DTC's. Check and repair all engine DTC's prior to performing transmission symptom diagnostics.With the DRBIII®, read Transmission DTC's. Record all DTC's and 1 Trip Failures.
NOTE: Diagnose 1 Trip Failures as a fully matured DTC.
Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.Repair as necessary.Perform the Shift Lever Position Test. If the test does not pass, refer to Symptom test for P0706 CHECK SHIFTER SIGNAL .For Gear Ratio DTC's, check and record all CVI's.Most DTC's set on start up but some must be set by driving the vehicle such that all diagnostic monitors have run.
NOTE: Verify the flash level of the transmission controller. Some problems are corrected by software upgrades to the transmission controller.
NOTE: Check for applicable TSB's related to the problem.
Perform this procedure prior to Symptom diagnosis.ContinueGo To 2		 All
2 Ignition on, engine not running.
Press the accelerator pedal all the way down to wide open throttle.
With the DRBIII® in Transmission Sensors, read the TPS/APPS voltage.
Is the TPS/APPS voltage above 4.94 volts?
Yes --> Go To 3
No --> Go To 11		 All
3 Turn the ignition off to the lock position.
Disconnect the APP Sensor harness connector.
Ignition on, engine not running.
With the DRBIII® in Transmission Sensors, read the TPS/APPS voltage.
Is the voltage above 0.5 volts?
Yes --> Go To 4
No --> Go To 5		 All
4 Turn the ignition off to the lock position.
Disconnect the APP Sensor harness connector.
Disconnect the TCM harness connector.
Remove the Transmission Control Relay.
Connect a jumper wire between the Fused B+ circuit and the Transmission Control Relay Output circuit in the Transmission Control Relay connector.
Ignition on, engine not running.
Measure the voltage of the APP Sensor Signal circuit.
Is the voltage above 0.5 volt?
Yes --> Repair the APP Sensor Signal circuit for a short to voltage.
Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1 .
No --> Go To 10		 All
5 Turn the ignition off to the lock position.
Disconnect the APP Sensor harness connector.
Ignition on, engine not running.
Measure the voltage of the 5-volt Supply circuit.
Is the voltage above 5.5 volts?
Yes --> Go To 6
No --> Go To 7		 All
6 Turn the ignition off to the lock position.
Disconnect the APP Sensor harness connector.
Disconnect the TCM harness connector.
Remove the Transmission Control Relay.
Connect a jumper wire between the Fused B+ circuit and the Transmission Control Relay Output circuit in the Transmission Control Relay connector.
Ignition on, engine not running.
Measure the voltage of the 5-volt Supply circuit.
Is the voltage above 0.5 volt?
Yes --> Repair the 5-volt Supply circuit for a short to voltage.
Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1 .
No --> Go To 10		 All
7 Turn the ignition off to the lock position.
Disconnect the TCM harness connector.
Disconnect the APP Sensor harness connector.
Measure the resistance of the Speed Sensor Ground circuit between the TCM harness connector and the APP Sensor harness connector.
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 8		 All
8 Turn the ignition off to the lock position.
Disconnect the APP Sensor harness connector.
Disconnect the TCM harness connector.
Remove the Transmission Control Relay.
Connect a jumper wire between the Fused B+ circuit and the Transmission Control Relay Output circuit in the Transmission Control Relay connector.
Ignition on, engine not running.
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 voltage.
Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1 .
No --> Go To 9		 All
9 Turn the ignition off to the lock position.
Replace the Accelerator Pedal Position Sensor per the Service Information
Ignition on, engine not running.
Press the accelerator pedal all the way down to wide open throttle.
With the DRBIII® in Transmission Sensors, read the TPS/APPS voltage.
Is the TPS/APPS voltage above 4.94 volts?
Yes --> Go To 10
No --> Repair Complete.
Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1 .		 All
10 Using the schematics as a guide, inspect the wiring and connectors. Repair as necessary. Pay particular attention to all power and ground circuits.
If there are no possible causes remaining, view repair.
Repair
Replace the Transmission Control Module per the Service Information. WITH THE DRBIII® PERFORM QUICK LEARN .
Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1 .		 All
11 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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