Nissan Leaf. Manual - part 539

EVC-180

< DTC/CIRCUIT DIAGNOSIS >

P0AA6 HIGH VOLTAGE SYSTEM ISOLATION

4.

CHECK INSULATION RESISTANCE OF ELECTRIC COMPRESSOR

Check insulation resistance of electric compressor. Refer to 

HAC-179, "Component Inspection"

.

CAUTION:

• Since testers are polarized, check the polarity of the tester and connect it in the forward direction to

the circuit.

• If the inspection results show no continuity, check the parts for proper installation.
Is the inspection result normal?

YES

>> Check intermittent incident. Refer to 

GI-53, "Intermittent Incident"

.

NO

>> GO TO 5.

5.

CHECK REFRIGERANT GAS

Interview the customer and check maintenance records to see if there is the possibility that coolant a gas other

than EV specific refrigerant gas is mixed in A/C refrigerant gas.

NOTE:

If A/C refrigerant gas other than EV specific refrigerant gas is used, insulation resistance may decrease.
Is the inspection result normal?

YES

>> Replace electric compressor. Refer to 

HA-37, "Removal and Installation"

 (With heat pump sys-

tem) or 

HA-95, "Removal and Installation"

 (Without heat pump system).

NO

>> Change refrigerant gas and compressor oil.

6.

PRECONDITIONING

WARNING:

Disconnect high voltage. Refer to 

GI-33, "How to Disconnect High Voltage"

.

Check voltage in high voltage circuit. (Check that condenser are discharged.)

1. Lift up the vehicle and remove the Li-ion battery under covers. Refer to 

EVB-181, "Exploded View"

.

2. Disconnect high voltage harness connector and PTC heater harness connector from front side of Li-ion

battery. Refer to 

EVB-181, "Removal and Installation"

.

3. Measure voltage between high voltage harness connector terminals and PTC heater harness connector

terminals.

DANGER:

 

 Touching high voltage components without using the appropriate protective equipment will

cause electrocution.

CAUTION:

For voltage measurements, use a tester which can measure to 500 V or higher.

>> GO TO 7.

7.

CHECK INSULATION RESISTANCE OF PTC HEATER

Check insulation resistance of PTC heater. Refer to 

HAC-181, "Component Inspection"

 [Auto A/C (with heat

pump)] or 

HAC-341, "Component Inspection"

 [Auto A/C (without heat pump)].

Standard

: 5 V or less 

JPCIA0296ZZ

P0AA6 HIGH VOLTAGE SYSTEM ISOLATION

EVC-181

< DTC/CIRCUIT DIAGNOSIS >

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CAUTION:

• Since testers are polarized, check the polarity of the tester and connect it in the forward direction to

the circuit.

• If the inspection results show no continuity, check the parts for proper installation.
Is the inspection result normal?

YES

>> Check intermittent incident. Refer to 

GI-53, "Intermittent Incident"

.

NO

>> Replace PTC heater. Refer to 

HAC-201, "Removal and Installation"

 [Auto A/C (with heat pump)]

or 

HAC-359, "Removal and Installation"

 [Auto A/C (without heat pump)].

8.

PRECONDITIONING

WARNING:

Disconnect high voltage. Refer to 

GI-33, "How to Disconnect High Voltage"

.

Check voltage in high voltage circuit. (Check that condenser are discharged.)

1. Lift up the vehicle and remove the Li-ion battery under covers. Refer to 

EVB-181, "Exploded View"

.

2. Disconnect high voltage harness connector and PTC heater harness connector from front side of Li-ion

battery. Refer to 

EVB-181, "Removal and Installation"

.

3. Measure voltage between high voltage harness connector terminals and PTC heater harness connector

terminals.

DANGER:

 

 Touching high voltage components without using the appropriate protective equipment will

cause electrocution.

CAUTION:

For voltage measurements, use a tester which can measure to 500 V or higher.

>> GO TO 9.

9.

CHECK INSULATION RESISTANCE OF TRACTION MOTOR INVERTER

Check insulation resistance of traction motor inverter. Refer to 

TMS-100, "Component Inspection"

.

CAUTION:

• Since testers are polarized, check the polarity of the tester and connect it in the forward direction to

the circuit.

• If the inspection results show no continuity, check the parts for proper installation.
Is the inspection result normal?

YES

>> Replace traction motor inverter. Refer to 

TMS-103, "Removal and Installation"

.

NO

>> Replace traction motor. Refer to 

TMS-109, "Removal and Installation"

.

10.

PRECONDITIONING

WARNING:

Disconnect high voltage. Refer to 

GI-33, "How to Disconnect High Voltage"

.

Check voltage in high voltage circuit. (Check that condenser are discharged.)

1. Lift up the vehicle and remove the Li-ion battery under covers. Refer to 

EVB-181, "Exploded View"

.

Standard

: 5 V or less 

JPCIA0296ZZ

EVC-182

< DTC/CIRCUIT DIAGNOSIS >

P0AA6 HIGH VOLTAGE SYSTEM ISOLATION

2. Disconnect high voltage harness connector and PTC heater harness connector from front side of Li-ion

battery. Refer to 

EVB-181, "Removal and Installation"

.

3. Measure voltage between high voltage harness connector terminals and PTC heater harness connector

terminals.

DANGER:

 

 Touching high voltage components without using the appropriate protective equipment will

cause electrocution.

CAUTION:

For voltage measurements, use a tester which can measure to 500 V or higher.

>> GO TO 11.

11.

CHECK INSULATION RESISTANCE OF PDM (POWER DELIVERY MODULE)

Check insulation resistance of PDM (Power Delivery Module). Refer to 

VC-100, "Diagnosis Procedure"

.

CAUTION:

• Since testers are polarized, check the polarity of the tester and connect it in the forward direction to

the circuit.

• If the inspection results show no continuity, check the parts for proper installation.
Is the inspection result normal?

YES

>> Check intermittent incident. Refer to 

GI-53, "Intermittent Incident"

.

NO

>> Replace PDM (Power Delivery Module). Refer to 

VC-112, "Removal and Installation"

.

12.

PRECONDITIONING

WARNING:

Disconnect high voltage. Refer to 

GI-33, "How to Disconnect High Voltage"

.

Check voltage in high voltage circuit. (Check that condenser are discharged.)

1. Lift up the vehicle and remove the Li-ion battery under covers. Refer to 

EVB-181, "Exploded View"

.

2. Disconnect high voltage harness connector and PTC heater harness connector from front side of Li-ion

battery. Refer to 

EVB-181, "Removal and Installation"

.

3. Measure voltage between high voltage harness connector terminals and PTC heater harness connector

terminals.

Standard

: 5 V or less 

JPCIA0296ZZ

JPCIA0296ZZ

P0AA6 HIGH VOLTAGE SYSTEM ISOLATION

EVC-183

< DTC/CIRCUIT DIAGNOSIS >

D

E

F

G

H

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DANGER:

 

 Touching high voltage components without using the appropriate protective equipment will

cause electrocution.

CAUTION:

For voltage measurements, use a tester which can measure to 500 V or higher.

>> GO TO 13.

13.

CHECK INSULATION RESISTANCE OF HIGH VOLTAGE HARNESS

WARNING:

Unlike the ordinary tester, the insulation resistance tester applies 500 V when measuring. If used

incorrectly, there is the danger of electric shock. If used in the vehicle 12 V system, there is the danger

of damage to electronic devices. Read the insulation resistance tester instruction manual carefully

and be sure to work safely.

1. Disconnect Li-ion battery high voltage harness connector (H3).

2. Check the insulation resistance of high voltage harness with an insulation resistance tester (Multi tester),

between Li-ion battery and PDM (Power Delivery Module).

CAUTION:

• Use 500 V range of insulation resistance tester to measure insulation resistance. 

• Wait for 30 seconds until the value becomes stable.

• If the inspection results show no continuity, check the parts for proper installation.

Is the inspection result normal?

YES

>> GO TO 19.

NO

>> GO TO 14.

14.

CHECK INSULATION RESISTANCE OF ELECTRIC COMPRESSOR

Check insulation resistance of electric compressor. Refer to 

HAC-179, "Component Inspection"

 [Auto A/C

(with heat pump)] or 

HAC-339, "Component Inspection"

 [Auto A/C (without heat pump)].

CAUTION:

• Since testers are polarized, check the polarity of the tester and connect it in the forward direction to

the circuit.

• If the inspection results show no continuity, check the parts for proper installation.
Is the inspection result normal?

YES

>> GO TO 16.

NO

>> GO TO 15.

15.

CHECK REFRIGERANT GAS

Interview the customer and check maintenance records to see if there is the possibility that coolant a gas other

than EV specific refrigerant gas is mixed in A/C refrigerant gas.

NOTE:

If A/C refrigerant gas other than EV specific refrigerant gas is used, insulation resistance may decrease.
Is the inspection result normal?

Standard

: 5 V or less 

+

−

Resistance

Li-ion battery

Connector

Terminal

H17

37

Ground

5.6 M

Ω

38