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DTC P061A: Internal Control Module Torque Performance Problem

 
 
 
 
TECHNICAL DESCRIPTION
Compares the actual torque signal computed from a mass airflow sensor signal with the driver demand torque signal computed from an accelerator pedal position sensor signal.
 
 
MONITOR EXECUTION
  • Continuous
 
 
MONITOR EXECUTION CONDITIONS (Other monitor and Sensor)
Other Monitor (There is no temporary DTC set 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
  • Engine speed is more than 500 r/min.
  • Volumetric efficiency is more than 16 percent.
Judgment Criterion
  • The requested torque signal subtracted from the actual torque signal is more than 50 N·m (37 ft-lb) for 5 second.
 
 
FAIL-SAFE AND BACKUP FUNCTION
  • Throttle opening degree position is in default position.
 
 
OBD-II DRIVE CYCLE PATTERN
  • Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 17 .
 
 
TROUBLESHOOTING HINTS (The most likely causes for this code to be set are:)
  • Throttle actuator control motor failed.
  • Connector damage.
  • Harness damage.
  • Intake system vacuum leak.
  • There is some foreign matter around mass airflow sensor.
  • ECM failed.

 
 
DIAGNOSIS
Required Special Tool:
  • 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, read the diagnostic trouble code (DTC).
cautionTo 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) Read the DTC.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is the diagnostic trouble code other than P061A set?
Refer to, Diagnostic Trouble Code Chart .
Go to Step 2.
 
STEP 2. Check for intake system vacuum leak.
Are there any abnormalities?
Repair it. Then go to Step 12.
Go to Step 3.
 
STEP 3. Check for foreign matter being around the mass airflow sensor.
Are there any foreign matter?
Repair it. Then go to Step 12.
Go to Step 4.
 
STEP 4. Using scan tool MB991958, check data list item 10: Mass Airflow Sensor.
(1) Start the engine and run at idle.
(2) Set scan tool MB991958 to the data reading mode for item 10, Mass Airflow Sensor.
(3) Warm up the engine to normal operating temperature: 80°C to 95°C (176°F to 203°F).
  • The standard value during idling should be between 1,350 and 1,670 millivolts.
  • When the engine is revved, the output voltage should increase according to the increase in engine speed.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is the sensor operating properly?
Go to Step 5.
Refer to, DTC P0102 - Mass Airflow Circuit Low Input , DTC P0103 - Mass Airflow Circuit High Input .
 
STEP 5. Using scan tool MB991958, check data list item 11: Accelerator Pedal Position Sensor (main).
(1) Turn the ignition switch to the "ON" position.
(2) Set scan tool MB991958 to the data reading mode for item 11, Accelerator Pedal Position Sensor (main).
  • Output voltage should be between 900 and 1,100 millivolts when foot is released from accelerator pedal.
  • Output voltage should be 4,000 millivolts or more when accelerator pedal is fully depressed.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Is the sensor operating properly?
Go to Step 6.
Refer to, DTC P2122 - Accelerator Pedal Position Sensor (main) Circuit Low Input , DTC P2123 - Accelerator Pedal Position Sensor (main) Circuit High Input .
 
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 should be between 400 and 600 millivolts when foot is released from accelerator pedal.
  • Output voltage should be 2,000 millivolts or more when accelerator pedal is fully depressed.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Is the sensor operating properly?
Go to Step 7.
Refer to, DTC P2127 - Accelerator Pedal Position Sensor (sub) Circuit Low Input , DTC P2128 - Accelerator Pedal Position Sensor (sub) Circuit High Input .
 
STEP 7. Check harness connector B-12 at electronic-controlled throttle valve and harness connector B-26 at ECM for damage.
Are the harness connectors in good condition?
Go to Step 8.
Repair or replace them. Refer to GROUP 00E, Harness Connector Inspection . Then go to Step 12.
 
STEP 8. Check the throttle actuator control motor.
(1) Disconnect the electronic-controlled throttle valve connector B-12.
(2) Measure the resistance between electronic-controlled throttle valve side connector terminal No. 1 and No. 2.
Standard value: 0.3 - 80 Ω [at 20°C (68°C)]
Is the measured resistance between 0.3 and 80 Ω [at 20°C (68°C)?
Go to Step 9.
Replace the throttle body assembly. Then go Step 12.
 
STEP 9. Check for harness damage between electronic-controlled throttle valve connector B-12 (terminal No. 1) and ECM connector B-26 (terminal No. 15).
Is the harness wire in good condition?
Go to Step 10.
Repair it. Then go to Step 12.
 
STEP 10. Check for harness damage between electronic-controlled throttle valve connector B-12 (terminal No. 2) and ECM connector B-26 (terminal No. 16).
Is the harness wire in good condition?
Go to Step 11.
Repair it. Then go to Step 12.
 
STEP 11. Check the trouble symptoms.
(1) Carry out a test drive with the drive cycle pattern. Refer to Diagnostic Function - OBD-II Drive Cycle Pattern 17 .
(2) Check the diagnostic trouble code (DTC).
Is DTC P061A set?
Replace the ECM (Refer to, Removal and Installation ). Then go to Step 12.
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 .
 
STEP 12. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to Diagnostic Function - OBD-II Drive Cycle Pattern 17 .
(2) Check the diagnostic trouble code (DTC).
Is DTC P061A set?
Retry the troubleshooting.
The inspection is complete.