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DTC P0A44: Motor speed fails
 
 
 
 
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)
  • Drive motor position sensor
 
 
DTC SET CONDITIONS
Logic Flow Chart
Check Conditions
  • Power drive unit (FEMCU) power supply voltage is 8 volts to 16 volts.
Judgment Criterion
  • Change of the revolution speed is more than 14,000 rpm for 1 second.
 
 
OBD-II DRIVE CYCLE PATTERN
  • Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 4 .
 
 
PROBABLE CAUSES
  • Oil filter clogging
  • Pipe clogging
  • Malfunction of the power drive unit (FEMCU)
  • Malfunction of the front motor assembly
  • The oil cooling system fails
  • Malfunction of the front transaxle assembly
 
 
DIAGNOSIS
Required Special Tools
  • MB991223: Wiring harness set
  • MB992006: Extra fine probe
STEP 1. Using scan tool (M.U.T.-IIISE), check whether the DTC is set.
Check if the DTC P0A3F is set in the power drive unit (FEMCU).
Is the DTC set?
Carry out troubleshooting for the DTC P0A3F (Refer to ). Then go to Step 7.
Go to Step 2.
 
STEP 2. Check the front motor assembly.
Drive the vehicle to check whether there is abnormal sound or rotation trouble in the front motor.
Is the check result normal?
Replace the power drive unit (Refer to ). Then go to Step 7.
Go to Step 3.
 
STEP 3. Using scan tool (M.U.T.-IIISE), check whether the other DTC is set.
Check whether the power drive unit [generator control unit (GCU)] set a DTC P105C, P105B or P10AE which is related to the electric oil pump.
Is the DTC set?
Carry out troubleshooting for the DTC P105C, P105B or P10AE (Refer to <DTC P105C>, <DTC P105B>, <DTC P10AE>). Then go to Step 7.
Go to Step 4.
 
STEP 4. Check the oil level.
Check that the oil level is at the lower edge of the oil level plug hole.
Is the check result normal?
Go to Step 5.
Inject oil (Refer to GROUP 14B - On-Vehicle Service <Oil Cooling System> - Oil Change ). Then go to Step 6.
 
STEP 5. Oil filter check
Remove the generator drain plug, check that the oil filter behind it is not clogged or damaged.
Is the check result normal?
Replace the front motor assembly (Refer to ), the generator (Refer to ), the Oil (Refer to GROUP 14B - On-Vehicle Service <Oil Cooling System> - Oil Change ), the EV oil cooler hose (Refer to GROUP 14B - Oil Hose and Pipe ) and the front transaxle assembly (Refer to GROUP 22A - Transaxle Assembly ). Then go to Step 7.
Replace the EV oil cooler hose and EV oil cooler pipe (Refer to GROUP 14B - Oil Hose and Pipe ), the EV oil cooler bypass valve and electric oil pump (Refer to GROUP 14B - Electric Oil Pump/EV Oil Cooler Bypass Valve ), the front motor assembly (Refer to ), the Oil (Refer to GROUP 14B - On-Vehicle Service <Oil Cooling System> - Oil Change ), the generator (Refer to ) and the front transaxle assembly (Refer to GROUP 22A - Transaxle Assembly ). Then go to Step 7.
 
STEP 6. Using scan tool (M.U.T.-IIISE), check the actuator test.
cautionWhen ambient temperature is -15°C (5°F) or less, the oil pump may not operate stably. Execute the actuator test only when the temperature is above -15°C (5°F).
(1) Execute the GCU actuator test below: (Refer to .)
Item No.1: Oil pump
(2) Check for the existence of oil leakage.
Is the oil level appropriate?
Go to Step 5.
Go to Step 4.
 
STEP 7. 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 4 .
(2) Check the DTC.
Is the DTC set?
Retry the troubleshooting.
The inspection is complete.