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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 - P0124-TPS/APPS INTERMITTENT - 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 With the DRBIII®, read Transmission DTCs.
Are there any APPS/TPS High or Low DTCs present?
Yes --> Refer to the TRANSMISSION CATEGORY  and perform the appropriate symptom.
Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1 .
No --> Go To 3		 All
3 Ignition on, engine not running.
With the DRBIII®, under Transmission Sensors, monitor the APPS/TPS voltage in the following step.
Slowly open and close the throttle while checking for erratic voltage changes.
Did the TPS voltage change smooth and consistent?
Yes --> Go To 4
No --> Replace the Accelerator Pedal Position Sensor per the Service Information.
Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1 .		 All
4 Ignition on, engine not running.
With the DRBIII®, under Transmission Sensors, monitor the APPS/TPS voltage in the following step.
While checking for erratic voltage changes, perform a wiggle test by wiggling all the wiring and connectors pertaining to the APPS/TPS while slowly opening and closing the throttle.
Did the APPS/TPS voltage change smooth and consistent?
Yes --> Go To 5
No --> Repair wiring and/or connectors as necessary.
Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1 .		 All
5 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
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