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DIAGNOSIS CHART FOR DTC No. P0AA6-00
 
 
Inspection procedures when BMU P0AA6-00: Insulation Resistance Drop Detection Diagnosis is set.
caution
  • When the DTC is set in the PHEV-ECU, PHEV A/C amplifier, power drive unit, REMCU or On Board Charger (OBC)/DC-DC converter, perform troubleshooting for the DTC first.
  • By performing the inspection items shown in the table below, you can narrow down the trouble spot where the insulation resistance is declined in the high voltage circuit.
  • Perform the inspection items in order from (1), and take the necessary steps for the trouble spots corresponding to each judgment results.
 
 
Table 1: Estimated trouble spots list
Inspection ItemEstimated trouble spotsAction
(1) Confirm the timing of when DTC No. P0AA6 is set (Refer to table 2).(2) Measure the voltage at the service plug connector (Refer to table 3).(3) Check the resistance at the drive battery connection (Refer to table 4).
ANG (Inside of the drive battery)–
  • Service plug box
  • BMU
  • Cell voltage wiring harness
  • Bus bar
  • Junction box No. 2
  • Drive battery (battery module Nos. 1 to 8)
Refer to "Inspection Procedure 1: Drive battery module system" DRIVE BATTERY MODULE SYSTEM.
OK–BMURecheck the DTC.
B–NG (Drive battery side)Drive battery (Bus bar, drive battery high voltage connector, junction box No. 2)
  • Bus bar
  • Drive battery high voltage connector (front / rear)
  • Junction box No. 2
Refer to "Inspection Procedure 2: Drive battery external connection system" DRIVE BATTERY EXTERNAL CONNECTION SYSTEM.
NG (Vehicle front side)
  • Drive battery front cable
  • A/C compressor oil (Foreign objects are mixed or deteriorated quality.)
  • Electric A/C compressor
  • Power drive unit
Refer to "Inspection Procedure 3: Front high voltage system" FRONT HIGH-VOLTAGE SYSTEM.
NG (Vehicle rear side)
  • Drive battery rear cable (junction box/rear motor)
  • Junction box
  • On Board Charger (OBC)/DC-DC converter
  • Rear motor
  • AC inverter
  • AC inverter cable
Refer to "Inspection Procedure 4: Rear high voltage system" REAR HIGH-VOLTAGE SYSTEM.
OK–Recheck the DTC.
  • OK: Intermittent malfunction
  • NG: Retry the procedures from the first step.
C––
  • Generator
  • Power drive unit
Refer to "Inspection Procedure 5: Generator system" GENERATOR SYSTEM).
D––
  • A/C compressor oil (Foreign objects are mixed or deteriorated quality.)
  • Electric A/C compressor
Check the insulation resistance of the electric A/C compressor (Refer to  CHECK ON INSULATION RESISTANCE OF A/C COMPRESSOR).
E––
  • On Board Charger (OBC)/DC-DC converter
  • Normal charging cable
Perform troubleshooting of the On Board Charger (OBC)/DC-DC converter trouble symptom (Refer to TROUBLE SYMPTOM CHART).
F––
  • AC inverter
  • Connector(s) or wiring harness between AC inverter and 120V AC socket
  • Power drive unit
Refer to "Inspection Procedure 6: AC inverter system" AC INVERTER SYSTEM.
G––
  • Front motor
  • Rear motor
  • Power drive unit
Refer to "Inspection Procedure 7: Motor system"  MOTOR SYSTEM.
 
 
(1) Confirm the timing of when DTC No. P0AA6-00 is set.
1. Open hood, back door, rear left side door or rear right side door. (After that, work in the open state until instructed.)
2. Change the power supply mode of the electric motor switch to OFF from ON condition, then wait for 3 minutes or more in key lock condition. (Check that the P indicator on the selector lever turns off.)
3. Connect the M.U.T.-IIISE with the power supply mode of the electric motor switch changed to OFF.
4. Change the power supply mode of the electric motor switch to ON (READY indicator: OFF).
5. On the system selection screen of the M.U.T.-IIISE, select "BMS".
6. Erase the DTC using self-diagnosis function.
7. Satisfy the confirmation conditions and confirmation time in the table below from the top, and check the timing of when the DTC No. P0AA6-00 is set again.
Table 2 Confirming the timing of when the DTC No. P0AA6-00 is set
Confirmation conditionConfirmation timeJudgment resultReference for inspection items
  • Power supply mode of the electric motor switch: ON (READY indicator: OFF)
  • Selector position: P
1 minute or moreA
Satisfy the following conditions after closing the hood, back door, rear left side door or rear right side door.
  • Power supply mode of the electric motor switch: ON (READY indicator: OFF)
  • Selector position: P
  • Engine stop condition (Select the EV priority mode.)
  • A/C: OFF (A/C compressor stopped)
  • AC main switch: OFF
3 minutes or moreB
  • Power supply mode of the electric motor switch: ON (READY indicator: OFF)
  • Selector position: P
  • Engine running condition (Select the battery charge mode.)
  • A/C: OFF (A/C compressor stopped)
  • AC main switch: OFF
C
  • Power supply mode of the electric motor switch: ON (READY indicator: OFF)
  • Selector position: P
  • Operate the A/C compressor by setting the A/C as follows.*
    • Vehicles with heat pump system: 25°C (77°F) AUTO
    • Vehicles without heat pump system: MAX COOL
  • AC main switch: OFF
D
Perform normal charging.E
<Vehicles with AC power supply>
  • Power supply mode of the electric motor switch: ON (READY indicator: OFF)
  • Selector position: P
  • A/C: OFF (A/C compressor stopped)
  • AC main switch: ON
F
  • Power supply mode of the electric motor switch: ON (READY indicator: OFF)
  • Selector position: D
  • Drive the vehicle at a constant speed of 15 km/h (9 mph) or more.
  • A/C: OFF (A/C compressor stopped)
  • AC main switch: OFF
G
note*: The A/C compressor does not operate in the following conditions.
  • Vehicles with heat pump system: The ambient temperature is 15°C (59 °F) or less, or the charging state of the drive battery is 14% or less.
  • Vehicles without heat pump system: The ambient temperature is 0°C (32 °F) or less, or the charging state of the drive battery is 14% or less.
 
 
(2) Measure the voltage at the service plug connector.
dangerWhen servicing the high voltage system parts, always wear the specified protective gears, and shut off the high voltage by removing the service plug.
1. Remove the service plug from the service plug box (Refer to PRECAUTIONS ON HOW TO USE THE HIGH-VOLTAGE VEHICLE).
dangerDo not use the special tool electric insulation tester (MB992355) to measure the insulation resistance at the service plug connector. If used, the BMU may be damaged.
2. Measure the voltage between the following terminals on the service plug box assembly using a high voltage multimeter.
noteJudge by the voltage value after 1 minute or more has passed from the start of measurement.
Table 3 Measure the voltage at the service plug connector.
Measurement pointTerminal (+)Terminal (–)Judgment resultReference for inspection items
No. 1 (terminal on the right side of the vehicle)Body groundApproximately 0 VOK
Other than aboveNG (inside of the drive battery)
No. 1 (terminal on the left side of the vehicle)Body groundApproximately 0 VOK
Other than aboveNG (inside of the drive battery)
 
 
(3) Check the resistance at the drive battery connection.
dangerWhen servicing the high voltage system parts, always wear the specified protective gears, and shut off the high voltage by removing the service plug.
1. Disconnect the drive battery front cable and drive battery rear cable (junction box) from the drive battery.
2. Measure the insulation resistance at the following terminals on the drive battery front cable side, drive battery rear cable (junction box) side and drive battery side using the special tool electric insulation tester (MB992355).
Table 4 Check the resistance at the drive battery connection.
Measurement pointTerminal (+)Terminal (–)Judgment resultReference for inspection items
No. 3 (drive battery front cable N side)Body ground10 MΩ or moreOK
Other than aboveNG (vehicle front side)
No. 4 (drive battery front cable P side)10 MΩ or moreOK
Other than aboveNG (vehicle front side)
No. 5 [drive battery rear cable (junction box) N side]Body ground10 MΩ or moreOK
Other than aboveNG (vehicle rear side)
No. 6 [drive battery rear cable (junction box) P side]10 MΩ or moreOK
Other than aboveNG (vehicle rear side)
No. 7 (drive battery N connection side)Body ground50 MΩ or moreOK
Other than aboveNG (drive battery side)
No. 8 (drive battery P connection side)50 MΩ or moreOK
Other than aboveNG (drive battery side)