DTC P2127 Throttle/Pedal Position Sensor/Switch "E" Circuit Low Input

WARNING: This page is about a different variant/trim than selected.

DTC DETECTING CONDITION:

Detect as soon as malfunction occurs.
GENERAL DESCRIPTION < Ref. to DTC P2127 THROTTLE/PEDAL POSITION SENSOR/SWITCH "E" CIRCUIT LOW INPUT , Diagnostic Trouble Code (DTC) Detecting Criteria. >

TROUBLE SYMPTOM:

Erroneous idling
Poor driving performance

WIRING DIAGRAM:

Fig 1: DTC P2127 Throttle/Pedal Position Sensor/Switch "E" Circuit Low Input

Courtesy of SUBARU OF AMERICA, INC.

DTC P2127 THROTTLE/PEDAL POSITION SENSOR/SWITCH "E" CIRCUIT LOW INPUT DIAGNOSIS

Step	Check	Yes	No
1. CHECK OUTPUT VOLTAGE OF ACCELERATOR POSITION SENSOR. Turn the ignition switch to ON. Read the data of sub accelerator position sensor signal using Subaru Select Monitor. NOTE: Subaru Select Monitor For detailed operation procedure, refer to the "READ CURRENT DATA FOR ENGINE". < Ref. to , SUBARU SELECT MONITOR . >	Is the voltage more than 0.4 V?	Go to step 2.	Go to step 3.
2. CHECK POOR CONTACT IN CONNECTORS. Check poor contact in connectors between ECM and accelerator position sensor.	Is there any poor contact in connectors between ECM and accelerator position sensor?	Repair the poor contact in connectors.	Connector has returned to its normal condition at this time. A temporary poor contact in the connector might have been the cause.
3. CHECK HARNESS BETWEEN ECM AND ACCELERATOR POSITION SENSOR. Turn the ignition switch to OFF. Disconnect the connector from ECM. Disconnect the connector from accelerator position sensor. Measure the resistance between ECM connector and accelerator position sensor. Connector & terminal (B136) No. 28 - (B315) No. 2: (B136) No. 16 - (B315) No. 1:	Is the resistance less than 1 °?	Go to step 4.	Repair the open harness connector.
4. CHECK HARNESS BETWEEN ECM AND ACCELERATOR POSITION SENSOR. Measure the resistance between ECM connector and chassis ground. Connector & terminal (B136) No. 28 - Chassis ground: (B136) No. 16 - Chassis ground:	Is the resistance more than 1 MΩ?	Go to step 5.	Repair the ground short of harness.
5. CHECK POWER SUPPLY TO ACCELERATOR POSITION SENSOR. Connect the ECM connector. Turn the ignition switch to ON. Measure the voltage between accelerator position sensor connector and chassis ground. Connector & terminal (B315) No. 1 (+) - Chassis ground (-):	Is the voltage 4.5 - 5.5 V?	Go to step 6.	Repair the poor contact in ECM connector. If problem persists, replace the ECM. < Ref. to ENGINE CONTROL MODULE (ECM) . >
6. CHECK ACCELERATOR POSITION SENSOR. Measure the resistance of accelerator position sensor. Terminals No. 1 - No. 6:	Is the resistance 0.75 - 3.15 kΩ?	Go to step 7.	Replace the accelerator position sensor.
7. CHECK ACCELERATOR POSITION SENSOR. Measure the resistance of accelerator position sensor when accelerator pedal is released. Terminals No. 2 - No. 6: Check the measured value is within the specification without depressing the accelerator pedal.	Is the resistance 0.15 - 0.63 kΩ?	Go to step 8.	Replace the accelerator position sensor.
8. CHECK ACCELERATOR POSITION SENSOR. Measure the resistance of accelerator position sensor when acceleration pedal is being depressed. Terminals No. 2 - No. 6: Check the measured value is within the specification without depressing the accelerator pedal.	Is the resistance 0.28 - 1.68 kΩ?	Repair the poor contact in ECM connector. If problem persists, replace the ECM. < Ref. to ENGINE CONTROL MODULE (ECM) . >	Replace the accelerator position sensor.