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Home >> Jeep >> 2005 >> Wrangler Rubicon, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 488 (Powertrain Diagnostic Procedures - Gas) >> Diagnostic Information And Procedures >> Transmission - 42RLE - Diagnostic Tests >> P0122-Throttle Position Sensor/Apps Low >> Diagnostic Procedure

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.
P0122-THROTTLE POSITION SENSOR/APPS LOW DIAGNOSTIC TEST REFERENCE

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 Engine DTC's. Check and repair all Engine DTC's prior to performing any 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 flash level of Powertrain Control Module. Some problems are corrected by software upgrades to the Transmission and Engine software.
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®, check Engine DTC's, this includes all one trip failures.
Are there any Engine TPS DTCs present?
Yes --> Refer to the DRIVEABILITY CATEGORY  and perform the appropriate test.
Perform 42RLE (NGC) TRANSMISSION VERIFICATION TEST - VER 1 .
No --> Go To 3		 All
3 With the DRBIII®, record the EATX EVENT DATA to help identify the conditions in which the DTC was set.
With the DRBIII®, erase Transmission DTCs.
NOTE: To erase EATX EVENT DATA information, a BATTERY DISCONNECT must be performed. Performing a BATTERY DISCONNECT will reset all learned Transmission values to controller defaults which may lead to erratic shift schedules.

Drive the vehicle and try to duplicate the conditions in which the DTC was reported by the EATX EVENT DATA.
With the DRBIII®, read Transmission DTCs.
Did the DTC P0122 THROTTLE POSITION SENSOR LOW, reset?
Yes --> Go To 4
No --> Go To 5		 All
4
NOTE: Due to the integration of the Powertrain and Transmission Control Modules, bus communication between the modules is internal.
Using the schematics as a guide, inspect the wiring and connectors. Repair as necessary. Pay particular attention to all power and ground circuits.Verify the flash level of the controller and update the controller if available.With the DRBIII®, check the EATX EVENT DATA to help identify the conditions in which the DTC was set.If there are no possible causes remaining, view repair.RepairReplace the Powertrain Control Module per the Service Information. WITH THE DRBIII® PERFORM QUICK LEARN .Perform 42RLE (NGC) TRANSMISSION VERIFICATION TEST - VER 1 .		 All
5 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 shorted and open circuits.
Pay particular attention to the TPS signal and sensor ground 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 42RLE (NGC) TRANSMISSION VERIFICATION TEST - VER 1 .
No --> Test Complete.		 All
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