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DTC P2127: Accelerator Pedal Position Sensor (sub) Circuit Low Input










CIRCUIT OPERATION




TECHNICAL DESCRIPTION




DESCRIPTIONS OF MONITOR METHODS




MONITOR EXECUTION




MONITOR EXECUTION CONDITIONS (Other monitor and Sensor)


Other Monitor (There is no temporary DTC stored in memory for the item monitored below)
Sensor (The sensor below is determined to be normal)

DTC SET CONDITIONS


Logic Flow Chart


Check Condition
Judgement Criterion

FAIL-SAFE AND BACKUP FUNCTION




OBD-II DRIVE CYCLE PATTERN




TROUBLESHOOTING HINTS (The most likely causes for this code to be set are:)




DIAGNOSIS


Required Special Tools:
  • MB991958: Scan tool (M.U.T.-III Sub Assembly)

    • MB991824: V.C.I.
    • MB991827: USB Cable
    • MB991910: Main Harness A

STEP 1. Using scan tool MB991958, check data list item 12: Accelerator Pedal Position Sensor (sub).



caution To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
(1)Connect scan tool MB991958 to the data link connector.
(2)Turn the ignition switch to the "ON" position.
(3)Set scan tool MB991958 to the data reading mode for item 12, Accelerator Pedal Position Sensor (sub).

  • Output voltage is between 0.4 and 0.6 volt when foot is released from accelerator pedal.
  • Output voltage is 2.0 volts or higher when accelerator pedal is fully depressed.
(4)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is the sensor operating properly?

It can be assumed that this malfunction is intermittent. Refer to GROUP 00, How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions .

Go to Step 2.

STEP 2. Check harness connector C-01 at accelerator pedal position sensor for damage.


Q. Is the harness connector in good condition?

Go to Step 3.
Repair or replace it. Refer to GROUP 00E, Harness Connector Inspection . Then go to Step 11.

STEP 3. Measure the sensor supply voltage at accelerator pedal position sensor harness side connector C-01.


(1)Disconnect the connector C-01 and measure at the harness side.
(2)Turn the ignition switch to the "ON" position.

(3)Measure the voltage between terminal No. 4 and ground.

  • Voltage should be between 4.9 and 5.1 volts.
(4)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is the measured voltage between 4.9 and 5.1 volts?

Go to Step 7.

Go to Step 4.

STEP 4. Check harness connector B-10 at ECM for damage.


Q. Is the harness connector in good condition?

Go to Step 5.
Repair or replace it. Refer to GROUP 00E, Harness Connector Inspection . Then go to Step 11.

STEP 5. Check for open circuit and short circuit to ground between accelerator pedal position sensor connector C-01 (terminal No. 4) and ECM connector B-10 (terminal No. 78).


Q. Is the harness wire in good condition?

Go to Step 6.
Repair it. Then go to Step 11.

STEP 6. Using scan tool MB991958, check data list item 12: Accelerator Pedal Position Sensor (sub).


(1)Turn the ignition switch to the "ON" position.
(2)Set scan tool MB991958 to the data reading mode for item 12, Accelerator Pedal Position Sensor (sub).

  • Output voltage is between 0.4 and 0.6 volt when foot is released from accelerator pedal.
  • Output voltage is 2.0 volts or higher when accelerator pedal is fully depressed.
(3)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is the sensor operating properly?

It can be assumed that this malfunction is intermittent. Refer to GROUP 00, How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions .
Replace the ECM. When the ECM is replaced, register the ID code. Refer to GROUP 42B, ID Code Registration Necessity Judgment Table <Vehicles with KOS> or GROUP 42C, ID Codes Registration Judgment Table <Vehicles with WCM> . Then go to Step 11.

STEP 7. Check harness connector B-10 at ECM for damage.


Q. Is the harness connector in good condition?

Go to Step 8.
Repair or replace it. Refer to GROUP 00E, Harness Connector Inspection . Then go to Step 11.

STEP 8. Check for harness damage between accelerator pedal position sensor connector C-01 (terminal No. 4) and ECM connector B-10 (terminal No. 78).


Q. Is the harness wire in good condition?

Go to Step 9.
Repair it. Then go to Step 11.

STEP 9. Check for open circuit, short circuit to ground and harness damage between accelerator pedal position sensor connector C-01 (terminal No. 6) and ECM connector B-10 (terminal No. 77)


Q. Is the harness wire in good condition?

Go to Step 10.
Repair it. Then go to Step 11.

STEP 10. Replace the accelerator pedal position sensor.


(1)Replace the accelerator pedal position sensor.
(2)Turn the ignition switch to the "ON" position.
(3)After the DTC has been deleted, read the DTC again.
(4)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is DTC P2127 set?

Replace the ECM. When the ECM is replaced, register the ID code. Refer to GROUP 42B, ID Code Registration Necessity Judgment Table <Vehicles with KOS> or GROUP 42C, ID Codes Registration Judgment Table <Vehicles with WCM> . Then go to Step 11.
The inspection is complete.

STEP 11. Using scan tool MB991958, read the diagnostic trouble code (DTC).


(1)Turn the ignition switch to the "ON" position.
(2)After the DTC has been deleted, read the DTC again.
(3)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is DTC P2127 set?

Retry the troubleshooting.
The inspection is complete.