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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 - P0740-TCC OUT OF RANGE

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 DTC's.
Is the DTC P0750 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 With the DRBIII®, Read and RECORD ALL Transmission DTC's. After recording DTC's, erase DTC's.
Drive the vehicle until the transmission temperature is at least 43°C or 110°F.
Perform the following steps 3 times.
Drive the vehicle at 80 km/h or 50 MPH.
Allow 4th gear to engage for at least 10 seconds.
Close the Throttle.
Tip back into the throttle until the TPS angle is between 25 and 29 degrees.
NOTE: If the throttle angle goes over 30 degrees, you must close the throttle and try again.

Did the TCC engage (Engine speed approximately equal to input speed) during any of the attempts?
Yes --> Go To 4
No --> Go To 5		 All
4 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 DTC 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
5 With the DRBIII®, check for other transmission DTC's.
Are the DTCs P1775 and P0841 present also?
Yes --> Replace the Transmission Solenoid/TRS Assembly per the Service Information.
Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1 .
No --> Go To 6		 All
6 If there are no possible causes remaining, view repair.
Repair
Repair internal transmission per the Service Information. Inspect the Primary Oil Pump and replace if necessary. If no problems are found in the Oil Pump, replace the Transmission Solenoid/TRS Assembly. Replace the Torque Converter in either case.
Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1 .		 All
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