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Subaru Legacy Service Manual: Dtc p2128 throttle/pedal position sensor/switch "e" circuit high

Subaru Legacy Service Manual / Engine (diagnostics)(h4do) / Diagnostic procedure with diagnostic trouble code (dtc) / Dtc p2128 throttle/pedal position sensor/switch "e" circuit high

DTC DETECTING CONDITION:

Immediately at fault recognition

TROUBLE SYMPTOM:

Improper idling

Poor driving performance

CAUTION:

After servicing or replacing faulty parts, perform Clear Memory Mode Clear Memory Mode > OPERATION, and Inspection Mode Inspection Mode > PROCEDURE.

WIRING DIAGRAM:

Engine Electrical System ENGINE TYPE FB (WITHOUT PUSH BUTTON START) Engine Electrical System > WIRING DIAGRAM

Engine Electrical System ENGINE TYPE FB (WITH PUSH BUTTON START) Engine Electrical System > WIRING DIAGRAM

STEPCHECKYESNO

1.CHECK HARNESS BETWEEN ECM AND ACCELERATOR PEDAL POSITION SENSOR CONNECTOR.

1) Turn the ignition switch to OFF.

2) Disconnect the connectors from ECM and accelerator pedal position sensor.

3) Measure the resistance of harness between ECM connector and accelerator pedal position sensor connector.

Connector & terminal

(B134) No. 31 — (B315) No. 3:

(B134) No. 34 — (B315) No. 2:

Is the resistance less than 1 --

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P2128 THROTTLE/PEDAL POSITION SENSOR/SWITCH "E" CIRCUIT HIGH

Repair the harness and connector.

NOTE:

In this case, repair the following item:

Open circuit of harness between ECM connector and accelerator pedal position sensor connector

Poor contact of joint connector

2.CHECK HARNESS BETWEEN ECM AND ACCELERATOR PEDAL POSITION SENSOR CONNECTOR.

1) Connect the connector to ECM.

2) Measure the resistance between accelerator pedal position sensor connector and chassis ground.

Connector & terminal

(B315) No. 2 — Chassis ground:

Is the resistance less than 1 --

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P2128 THROTTLE/PEDAL POSITION SENSOR/SWITCH "E" CIRCUIT HIGH

Repair the harness and connector.

NOTE:

In this case, repair the following item:

Open circuit of harness between ECM connector and engine ground

Poor contact of ECM connector

3.CHECK HARNESS BETWEEN ECM AND ACCELERATOR PEDAL POSITION SENSOR CONNECTOR.

1) Turn the ignition switch to ON.

2) Measure the voltage between accelerator pedal position sensor connector and chassis ground.

Connector & terminal

(B315) No. 3 (+) — Chassis ground (−):

Is the voltage 5 V or more-

Repair the short circuit to power supply in harness between ECM connector and accelerator pedal position sensor connector.

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P2128 THROTTLE/PEDAL POSITION SENSOR/SWITCH "E" CIRCUIT HIGH

4.CHECK HARNESS BETWEEN ECM AND ACCELERATOR PEDAL POSITION SENSOR CONNECTOR.

1) Turn the ignition switch to OFF.

2) Disconnect the connector from ECM.

3) Measure the resistance between ECM connectors.

Connector & terminal

(B134) No. 28 — (B134) No. 31:

Is the resistance 1 M- or more-

Repair the poor contact of accelerator pedal position sensor connector. Replace the accelerator pedal if defective. Accelerator Pedal

Repair the short circuit to power supply in harness between ECM connector and accelerator pedal position sensor connector.

1. OUTLINE OF DIAGNOSIS

Detect the open or short circuit of accelerator pedal position sensor 2.

Judge as NG if out of specification.

2. COMPONENT DESCRIPTION

(1)

Engine control module (ECM)

(3)

Accelerator pedal position sensor 2 signal

(4)

Accelerator pedal position sensor

(2)

Accelerator pedal position sensor 1 signal

3. EXECUTION CONDITION

Secondary Parameters

Execution condition

Battery voltage

≥ 6 V

4. GENERAL DRIVING CYCLE

Always perform the diagnosis continuously.

5. DIAGNOSTIC METHOD

If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

Judgment Value

Malfunction Criteria

Threshold Value

Sensor 2 output voltage

≥ 4.757 V

Time Needed for Diagnosis: 100 ms

Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.

Dtc p2135 throttle/pedal position sensor/switch "a"/"b" voltage correlation
DTC DETECTING CONDITION:Immediately at fault recognitionTROUBLE SYMPTOM:• Improper idling• Poor driving performanceCAUTION:After servicing or replacing faulty parts, perform Clear Memory M ...

Dtc p2127 throttle/pedal position sensor/switch "e" circuit low
DTC DETECTING CONDITION:Immediately at fault recognitionTROUBLE SYMPTOM:• Improper idling• Poor driving performanceCAUTION:After servicing or replacing faulty parts, perform Clear Memory M ...

Other materials:

Inspection
1. Lift up the vehicle.2. Remove the filler plug, and then check the gear oil. Replace the gear oil if it is contaminated, deteriorated or cloudy. Differential Gear Oil > REPLACEMENT3. Check that the gear oil level is within −5 mm (−0.2 in) from the bottom of the filler plug hole. If th ...

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