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 NO. 1 LOW DIAGNOSTIC TEST REFERENCE
| TEST | ACTION | APPLICABILITY |
|---|---|---|
| 1 | Ignition on, engine not running. With the DRBIII®, read DTCs and record the related Freeze Frame data.
NOTE:
Diagnose any IAC codes before continuing. With the DRBIII®, read the TP Sensor voltage. Is the voltage below 0.2 of a volt? Yes --> Go To 2 No --> Go To 9 |
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| 2 | Turn the ignition off. Disconnect the TP Sensor harness connector. Ignition on, engine not running. Measure the voltage on the (F855) 5-volt Supply circuit at the TP Sensor harness connector. Is the voltage between 4.5 to 5.2 volts? Yes --> Go To 3 No --> Go To 6 |
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| 3 | With the DRBIII®, monitor the TP Sensor voltage with the Sensor harness connector disconnected. Is the voltage above 4.5 volts? Yes --> Replace the Throttle Position Sensor. Perform POWERTRAIN VERIFICATION TEST VER - 5 . No --> Go To 4 |
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| 4 | Turn the ignition off. Disconnect the C2 PCM harness connector. Measure the resistance between ground and the (K22) TP Sensor No. 1 Signal circuit at the TP Sensor harness connector. Is the resistance below 100 ohms? Yes --> Repair the short to ground in the (K22) TP Sensor No. 1 Signal circuit. Perform POWERTRAIN VERIFICATION TEST VER - 5 . No --> Go To 5 |
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| 5 | Measure the resistance between the (K22) TP Sensor No. 1 Signal circuit and the (K900) Sensor ground circuit at the TP Sensor harness connector. Is the resistance below 100 ohms? Yes --> Repair the short between the (K900) Sensor ground and the (K22) TP Sensor No. 1 Signal circuit. Perform POWERTRAIN VERIFICATION TEST VER - 5 . No --> Go To 8 |
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| 6 | Turn the ignition off. Disconnect the C2 PCM harness connector.
CAUTION:
DO NOT PROBE THE PCM HARNESS CONNECTORS. PROBING THE PCM HARNESS CONNECTORS WILL DAMAGE THE PCM TERMINALS RESULTING IN POOR TERMINAL TO PIN CONNECTION. INSTALL MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS. Measure the resistance of the (F855) 5-volt Supply circuit from the TP Sensor harness connector to the appropriate terminal of special tool #8815. Is the resistance below 5.0 ohms? Yes --> Go To 7 No --> Repair the open in the (F855) 5-volt Supply circuit. Perform POWERTRAIN VERIFICATION TEST VER - 5 . |
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| 7 | Measure the resistance between ground and the (F855) 5-volt Supply circuit at the TP Sensor harness connector. Is the resistance below 100 ohms? Yes --> Repair the short to ground in the (F855) 5-volt Supply circuit. Perform POWERTRAIN VERIFICATION TEST VER - 5 . No --> Go To 8 |
All |
| 8 |
NOTE:
Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary. Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.If there are no possible causes remaining, view repair.RepairReplace and program the Powertrain Control Module per Service Information.Perform POWERTRAIN VERIFICATION TEST VER - 5 . |
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| 9 | Ignition on, engine not running. With the DRBIII®, monitor the Throttle Position Sensor voltage. Slowly open the throttle from the idle position to the wide open throttle position. Does voltage start at approximately 0.8 of a volt and go above 3.5 volts with a smooth transition? Yes --> Refer to the INTERMITTENT CONDITION SYMPTOM . Perform POWERTRAIN VERIFICATION TEST VER - 5 . No --> Replace the Throttle Position Sensor. Perform POWERTRAIN VERIFICATION TEST VER - 5 . |
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