CHECK ON INSULATION RESISTANCE OF A/C COMPRESSOR

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).

caution

The insulation resistance check must be completed within 10 seconds. (Since DC 1,000 V is applied while checking, parts may be damaged if the check continues for 10 seconds or more.)

Required Special Tools:

MB991223: Wiring harness set
MB992006: Extra fine probe
MB992355: Electric insulation tester

1. Remove the power drive unit cover.

2. Remove the service lid on the power drive unit.

3. Disconnect the A/C compressor cable from the power drive unit.

4. Use the electric insulation tester (Special tool: MB992355) and set it to the 1,000 V range.

5. Measure the insulation resistance between the A/C compressor cable high voltage terminals (P, N) and electric A/C compressor (body ground).

Standard value: 10 MΩ or more

6. If the measured value is not within the standard value, remove the A/C compressor cable from the electric A/C compressor.

7. Use the electric insulation tester (Special tool: MB992355) and set it to the 1,000 V range.

8. Measure the insulation resistance between the electric A/C compressor high voltage terminals (P, N) and electric A/C compressor (body ground).

Standard value: 10 MΩ or more

If the measured value is within the standard value, replace the A/C compressor cable.
If the measured value is not within the standard value, replace the A/C refrigerant and compressor oil. If the problem is not eliminated even after replacing the A/C refrigerant and the compressor oil, replace the electric A/C compressor.