2014 Jeep Wrangler JK Factory Service Manual 28 - DTC-Based Diagnostics

P2107-ELECTRONIC THROTTLE CONTROL MODULE PROCESSOR

Special Tools: Click to display a list of tools used in this procedure

For a complete wiring diagram, refer to the Wiring Information.





Thoery of operation

The Electronic Throttle Control (ETC) motor is controlled by the Powertrain Control Module (PCM). The DC motor located in the throttle body drives the throttle blade. In order to decrease idle speed, along with spark and fuel delivery changes the PCM commands the throttle closed reducing air flow into the engine and the idle speed decreases. In order to increase idle speed, the PCM commands the throttle plate open allowing more air to pass the throttle plate.


Possible Causes

THROTTLE PLATE / BORE INSPECTION
(K124) ETC POSITIVE CIRCUIT SHORTED TO VOLTAGE
(K126) ETC NEGATIVE CIRCUIT SHORTED TO VOLTAGE
(K124) ETC POSITIVE CIRCUIT SHORTED TO THE (K126) ETC NEGATIVE CIRCUIT
(K124) ETC POSITIVE CIRCUIT OPEN
(K124) ETC POSITIVE CIRCUIT SHORTED TO GROUND
(K126) ETC NEGATIVE CIRCUIT OPEN
(K126) ETC NEGATIVE CIRCUIT SHORTED TO GROUND
LOW BATTERY VOLTAGE
ETC MOTOR/THROTTLE BODY
POWERTRAIN CONTROL MODULE (PCM)

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).


1. ACTIVE DTC



NOTE: Diagnose and repair P2100-ELECTRONIC THROTTLE CONTROL CIRCUIT if set with P2107-ELECTRONIC THROTTLE CONTROL MODULE PROCESSOR DTC before continuing.
1. Check for any related TSBs.
2. Verify the PCM is at the latest calibration (flash level).

NOTE: An intermittent loss of power to the PCM without performing an ETC Relearn procedure may cause this DTC to set.
3. Flash the Powertrain Control Module in accordance with the Service Information if any updates are available.
4. Start the engine.
5. Allow the engine to reach normal operating temperature.
6. Operate the accelerator pedal. (do not exceed 3500 rpm)
7. Test drive the vehicle for 10 miles on a flat road surface.

NOTE: Diagnose and repair DTC P2100-ELECTRONIC THROTTLE CONTROL CIRCUIT before continuing.


Did DTC P2107-ELECTRONIC THROTTLE CONTROL MODULE PROCESSOR set active or pending at this time?

Yes


No


2. THROTTLE PLATE INSPECTION

1. Turn the ignition off.
2. Remove the Air Cleaner Assembly from the Throttle Body.
3. Check for any signs of a foreign material (ice or dirt) on the Throttle Plate or in the bore causing the Throttle Plate to stick.


Were any signs of foreign material or scoring of the throttle plate or bore found?

Yes


No


3. (K124) ETC POSITIVE CIRCUIT SHORTED TO VOLTAGE
1. Turn the ignition off.
2. Disconnect the Throttle Body harness connector.
3. Disconnect the PCM C2 harness connector.
4. Ignition on, engine not running.
5. Measure the voltage on the (K124) ETC Positive circuit at the Throttle Body harness connector.


Is there any voltage present?

Yes


No


4. (K126) ETC NEGATIVE CIRCUIT SHORTED TO VOLTAGE
1. Measure the voltage on the (K126) ETC Negative circuit at the Throttle Body harness connector.


Is there any voltage present?

Yes


No


5. (K124) ETC POSITIVE CIRCUIT SHORTED TO THE (K126) ETC NEGATIVE CIRCUIT

1. Turn the ignition off.
2. Measure the resistance between the (K124) ETC Positive circuit and the (K126) ETC Negative circuit at the Throttle Body harness connector.


Is the resistance below 100 Ohms?

Yes


No


6. (K124) ETC POSITIVE CIRCUIT OPEN

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 the GPEC Diagnostic Adaptor to perform the diagnosis.

1. Connect the Adapter, GPEC Diagnostic 10436 .
2. Measure the resistance of the (K124) ETC Positive circuit from the Throttle Body harness connector to the GPEC Adaptor.


Is the resistance below 5.0 Ohms?

Yes


No


7. (K124) ETC POSITIVE CIRCUIT SHORTED TO GROUND
1. Measure the resistance between ground and the (K124) ETC Positive circuit at the Throttle Body harness connector.


Is the resistance below 100 Ohms?

Yes


No


8. (K126) ETC NEGATIVE CIRCUIT OPEN

1. Measure the resistance of the (K126) ETC Negative circuit from the Throttle Body harness connector to the GPEC Adaptor.


Is the resistance below 5.0 Ohms?

Yes


No


9. (K126) ETC NEGATIVE CIRCUIT SHORTED TO GROUND
1. Measure the resistance between ground and the (K126) ETC Negative circuit at the Throttle Body harness connector.


Is the resistance below 100 Ohms?

Yes


No


10. ETC MOTOR

1. Connect the Throttle Body harness connector.
2. Measure the resistance of the ETC Motor between the (K124) ETC Positive circuit and the (K126) ETC Negative circuit at the GPEC Adaptor.


Is the resistance between 2.5 and 25 Ohms at closed throttle?

Yes


No


11. POWERTRAIN CONTROL MODULE (PCM)

1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Throttle Body and the Powertrain Control Module (PCM).
2. Look for any chafed, pierced, pinched or partially broken wires.
3. Look for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact in the Throttle Body and Powertrain Control Module connectors.
4. Perform any Technical Service Bulletins that may apply.


Were there any problems found?

Yes


No