P2138

DTC P2138: Accelerator Pedal Position Sensor (main and sub) Circuit Range/Performance Problem

CAUTION:
If DTC P2138 has been set, TCL related DTC U1120 is also set. After P2138 has been diagnosed, don't forget to erase DTC U1120.

ACCELERATOR PEDAL POSITION SENSOR (MAIN AND SUB) RANGE/PERFORMANCE PROBLEM CIRCUIT

- Refer to DTC P2122 - Accelerator Pedal Position Sensor (main) Circuit P2122 .

- Refer to DTC P2127 - Accelerator Pedal Position Sensor (sub) Circuit P2127 .

CIRCUIT OPERATION

- Refer to DTC P2122 - Accelerator Pedal Position Sensor (main) Circuit P2122 .

- Refer to DTC P2127 - Accelerator Pedal Position Sensor (sub) Circuit P2127 .

TECHNICAL DESCRIPTION

- ECM [M/T] or PCM [A/T] checks the accelerator pedal position sensor output signal characteristics for abnormal conditions.

DESCRIPTIONS OF MONITOR METHODS

Detect malfunction if the relation between accelerator pedal position sensor (main) and accelerator pedal position sensor (sub) is wrong.

MONITOR EXECUTION

Continuous

MONITOR EXECUTION CONDITIONS (Other monitor and Sensor)

Other Monitor (There is no temporary DTC stored in memory for the item monitored below)

- Not applicable
Sensor (The sensor below is determined to be normal)

- Not applicable

DTC SET CONDITIONS

Logic Flow Chart

Check Conditions

- Ignition switch is "ON" position.
- Accelerator pedal position sensor (main) output voltage is between 0.6 and 4.8 volts.
- Accelerator pedal position sensor (sub) output voltage is between 0.2 and 4.8 volts.
- Change of accelerator pedal position sensor (sub) output voltage per 25 milliseconds is lower than 0.06 volt.
- Battery voltage is higher than 6.3 volts.
Judgement Criteria

- Voltage obtained with the formula given below is 1.0 volt or higher for 1 second: [accelerator pedal position sensor (sub) output voltage +0.3 volt] - accelerator pedal position sensor (main) output voltage.
or
- Voltage obtained with the formula given below is 1.0 volt or higher for 0.2 second: [accelerator pedal position sensor (main) output voltage - [accelerator pedal position sensor (sub) output voltage +0.3 volt].

OBD-II DRIVE CYCLE PATTERN

None.

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

- Accelerator pedal position sensor failed.
- Harness damage in accelerator pedal position sensor circuit or connector damage.
- ECM failed. [M/T]
- PCM failed. [A/T]

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. Check whether the battery runs out or not.

- Check whether the user has had the experience of running out of the battery or not.

Q. Have you ever had the experience of running out of the battery before?

YES The possible cause of the outputted diagnosis code may be due to the battery drop.
Delete the diagnosis code and check on the situation for a while.
NO Go to Step 2 .
STEP 2. Check harness connector C-22 at accelerator pedal position sensor for damage.

Q. Is the harness connector in good condition?

YES Go to Step 3.

NO Repair or replace it. Harness Connector Inspection.
Then go to Step 17.

STEP 3. Check the continuity at accelerator pedal position sensor harness side connector C-22.

(1)Disconnect the connector C-22 and measure at the harness side.

(2)Measure the continuity between terminal No. 2 and ground.

- Continuity (2ohms or less)

Q. Does continuity exist?

YES Go to Step 7.

NO Go to Step 4.

STEP 4. Check harness connector B-19 at ECM [M/T] or PCM [A/T] for damage.

Q. Q: Is the harness connector in good condition?

YES Go to Step 5.

NO Repair or replace it. Harness Connector Inspection.
Then go to Step 17.

STEP 5. Check for harness damage between accelerator pedal position sensor connector C-22 (terminal No. 2) and ECM [M/T] or PCM [A/T] connector B-19 (terminal No. 31).

Q. Is the harness wire in good condition?

YES Go to Step 6.

NO Repair it. Then go to Step 17.

STEP 6. Using scan tool MB991958, read the diagnostic trouble code
(DTC).

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

Q. Is DTC P2138 set?

YES Replace the ECM or the PCM. When the ECM or the PCM is replaced, register the encrypted code. Immobilizer System.
Then go to Step 17.

NO It can be assumed that this malfunction is intermittent. How to Cope With Intermittent Malfunctions.

STEP 7. Check the continuity at accelerator pedal position sensor harness side connector C-22.

(1)Disconnect the connector C-22 and measure at the harness side.

(2)Measure the continuity between terminal No. 5 and ground.

- Continuity (2ohms or less)

Q. Does continuity exist?

YES Go to Step 11.

NO Go to Step 8.

STEP 8. Check harness connector B-19 at ECM [M/T] or PCM [A/T] for damage.

Q. Is the harness connector in good condition?

YES Go to Step 9.

NO Repair or replace it. Harness Connector Inspection.
Then go to Step 17.

STEP 9. Check for harness damage between accelerator pedal position sensor connector C-22 (terminal No. 5) and ECM [M/T] or PCM [A/T] connector B-19 (terminal No. 22).

Q. Is the harness wire in good condition?

YES Go to Step 10.

NO Repair it. Then go to Step 17.

STEP 10. Using scan tool MB991958, read the diagnostic trouble code
(DTC).

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

Q. Is DTC P2138 set?

YES Replace the ECM or the PCM. When the ECM or the PCM is replaced, register the encrypted code. Immobilizer System.
Then go to Step 17.

NO It can be assumed that this malfunction is intermittent. How to Cope With Intermittent Malfunctions.

STEP 11. Check harness connector B-19 at ECM [M/T] or PCM [A/T] for damage.

Q. Is the harness connector in good condition?

YES Go to Step 12.

NO Repair or replace it. Harness Connector Inspection.
Then go to Step 17.

STEP 12. Check for harness damage between accelerator pedal position sensor connector C-22 (terminal No. 1) and ECM [M/T] or PCM [A/T] connector B-19 (terminal No. 30).

Q. Is the harness wire in good condition?

YES Go to Step 13.

NO Repair it. Then go to Step 17.

STEP 13. Check for harness damage between accelerator pedal position sensor connector C-22 (terminal No. 4) and ECM [M/T] or PCM [A/T] connector B-19 (terminal No. 21).

Q. Is the harness wire in good condition?

YES Go to Step 14.

NO Repair it. Then go to Step 17.

STEP 14. Check for harness damage between accelerator pedal position sensor connector C-22 (terminal No. 3) and ECM [M/T] or PCM [A/T] connector B-19 (terminal No. 26).

Q. Is the harness wire in good condition?

YES Go to Step 15.

NO Repair it. Then go to Step 17.

STEP 15. Check for harness damage between accelerator pedal position sensor connector C-22 (terminal No. 6) and ECM [M/T] or PCM [A/T] connector B-19 (terminal No. 27).

Q. Is the harness wire in good condition?

YES Go to Step 16.

NO Repair it. Then go to Step 17.

STEP 16. 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 P2138 set?

YES Replace the ECM or the PCM. When the ECM or the PCM is replaced, register the encrypted code. Immobilizer System.
Then go to Step 17.

NO The inspection is complete.

STEP 17. Using scan tool MB991958, read the diagnostic trouble code
(DTC).