FRONT HIGH-VOLTAGE SYSTEM

Inspection Procedure 3: Front high voltage system

danger

When servicing the high voltage components, be sure to remove the service plug in order to shut off the high voltage (Refer to PRECAUTIONS ON HOW TO USE THE HIGH-VOLTAGE VEHICLE).
When servicing the high voltage components, be sure to wear an insulating protective equipment to measure the high voltage (Refer to PRECAUTIONS ON HOW TO USE THE HIGH-VOLTAGE VEHICLE).

note	When measuring the insulation resistance, set the range of the special tool electric insulation tester (MB992355) to 1,000 V.

TROUBLESHOOTING HINTS

Malfunction of the drive battery front cable
The A/C compressor oil (foreign objects are mixed or deteriorated quality)
Malfunction of the electric A/C compressor
Malfunction of the power drive unit

DIAGNOSIS

Required Special Tools:

MB992744: Vehicle communication interface-Lite (V.C.I.-Lite)
MB992745: V.C.I.-Lite main harness A
MB992747: V.C.I.-Lite USB cable short
MB992748: V.C.I.-Lite USB cable long
MB991223: Wiring harness set
MB992006: Extra fine probe
MB992355: Electric insulation tester

1.Insulation resistance check of drive battery front cable

(1) Disconnect the drive battery front cable from the power drive unit, and measure the insulation resistance at the cable side.

+ terminal	– terminal	Normal condition
Drive battery front cable P terminal	Body ground	10 MΩ or more
Drive battery front cable N terminal	Body ground	10 MΩ or more

Is the check result normal?

Replace the drive battery front cable (Refer to DRIVE BATTERY CABLE REMOVAL AND INSTALLATION

2.Insulation resistance check of electric A/C compressor

Check the insulation resistance of the electric A/C compressor (Refer to CHECK ON INSULATION RESISTANCE OF A/C COMPRESSOR

Is the check result normal?

Replace the faulty part.

3.Insulation resistance check of power drive unit

Check the insulation resistance of the power drive unit (Refer to CHECK ON INSULATION RESISTANCE OF POWER DRIVE UNIT

Is the check result normal?

Replace the power drive unit (Refer to POWER DRIVE UNIT REMOVAL AND INSTALLATION

4.Check whether the DTC is set again.

Is the DTC set?

Perform the "Inspection procedures when BMU P0AA6-00: Insulation Resistance Drop Detection Diagnosis is set." again (Refer to DIAGNOSIS CHART FOR DTC No. P0AA6-00

The trouble can be an intermittent malfunction (Refer to General Information - How to Use Troubleshooting/Inspection Service Points, How to Cope with Intermittent Malfunctions HOW TO COPE WITH INTERMITTENT MALFUNCTIONS