Nissan Leaf. Manual — part 791

B27F4 REFRIGERANT CHANNEL SWITCHING 3 WAY TYPE VALVE

HAC-167

< DTC/CIRCUIT DIAGNOSIS >

[AUTO A/C (WITH HEAT PUMP)]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair harness or connector.

2.

CHECK REFRIGERANT CHANNEL SWITCHING 3 WAY TYPE VALVE CONTROL CIRCUIT FOR SHORT

(BATTERY)

1. Turn power switch ON.

2. Check continuity between heat pump control unit harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair harness or connector.

3.

CHECK REFRIGERANT CHANNEL SWITCHING 3 WAY TYPE VALVE CONTROL CIRCUIT FOR SHORT

(GROUND)

1. Turn power switch OFF.

2. Check continuity between heat pump control unit harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair harness or connector.

4.

CHECK REFRIGERANT CHANNEL SWITCHING 3 WAY TYPE VALVE POWER SUPPLY

1. Turn power switch ON.

2. Check continuity between refrigerant channel switching 3 way type valve harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> GO TO 5.

5.

CHECK A/C RELAY CIRCUIT

Check A/C relay circuit. Refer to

EVC-385, "Diagnosis Procedure"

.

Is the inspection result normal?

YES

>> Repair harness or connector between A/C relay and refrigerant channel switching 3 way type

valve.

NO

>> Repair or replace malfunctioning components.

6.

CHECK HEAT PUMP CONTROL UNIT COMMUNICATION LINE FOR OPEN

Refrigerant channel switching 3 way type valve

Heat pump control unit

Continuity

Connector

Terminal

Connector

Terminal

E91

2

M102

7

Yes

+

−

Voltage

(Approx.)

Heat pump control unit

Connector

Terminal

M102

7

Ground

0 V

Heat pump control unit

—

Continuity

Connector

Terminal

M102

7

Ground

No

+

−

Voltage

(Approx.)

Refrigerant channel switching 3 way type valve

Connector

Terminal

E91

1

Ground

Battery voltage

HAC-168

< DTC/CIRCUIT DIAGNOSIS >

[AUTO A/C (WITH HEAT PUMP)]

B27F4 REFRIGERANT CHANNEL SWITCHING 3 WAY TYPE VALVE

1. Turn power switch OFF.

2. Disconnect heat pump control unit connector and A/C auto amp. connector.

3. Check continuity between heat pump control unit harness connector and A/C auto amp. harness connec-

tor.

NOTE:

Check for any adhering foreign substances, cracking, or damage on the heat pump control unit terminal

and A/C auto amp. harness connector terminal.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> Repair harness or connector.

7.

CHECK HEAT PUMP CONTROL UNIT COMMUNICATION LINE FOR SHORT

Check continuity between heat pump control unit harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 8.

NO

>> Repair harness or connector.

8.

CHECK REFRIGERANT CHANNEL SWITCHING 3 WAY TYPE VALVE

Check refrigerant channel switching 3 way type valve. Refer to

HAC-165, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 9.

NO

>> Replace high-pressure cooler pipe assembly. Refer to

HA-47, "2-WAY VALVE AND 3-WAY VALVE

ASSEMBLY : Removal and Installation"

.

9.

PERFORM DTC CONFIRMATION PROCEDURE

Perform DTC confirmation procedure. Refer to

HAC-166, "DTC Logic"

.

Is DTC B27F4 detected?

YES

>> Replace heat pump control unit. Refer to

HAC-188, "Removal and Installation"

.

NO

>> Check intermittent incident. Refer to

GI-53, "Intermittent Incident"

.

Heat pump control unit

A/C auto amp.

Continuity

Connector

Terminal

Connector

Terminal

M102

1

M55

40

Yes

Heat pump control unit

—

Continuity

Connector

Terminal

M102

1

Ground

No

B27F5 REFRIGERANT CHANNEL SWITCHING 3 WAY TYPE VALVE

HAC-169

< DTC/CIRCUIT DIAGNOSIS >

[AUTO A/C (WITH HEAT PUMP)]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

B27F5 REFRIGERANT CHANNEL SWITCHING 3 WAY TYPE VALVE

DTC Logic

INFOID:0000000010121874

DTC DETECTION LOGIC

NOTE:

• If DTC is displayed along with DTC U1000, first perform the trouble diagnosis for DTC U1000. Refer to

HAC-

87, "DTC Logic"

.

• If DTC is displayed along with DTC U1010, first perform the trouble diagnosis for DTC U1010.

HAC-88,

"DTC Logic"

.

DTC CONFIRMATION PROCEDURE

1.

PERFORM DTC CONFIRMATION PROCEDURE

With CONSULT

1. Turn power switch OFF.

2. Set the vehicle to READY.

3. Operate the automatic air conditioning system.

4. Set the temperature to full cold and wait at least 5 seconds.

5. Select “Self Diagnostic Result” of “HVAC” using CONSULT.

6. Check DTC.
Is DTC detected?

YES

>> Refer to

HAC-169, "Diagnosis Procedure"

.

NO

>> Inspection End.

Diagnosis Procedure

INFOID:0000000010121875

Regarding Wiring Diagram information, refer to

HAC-61, "Wiring Diagram"

.

NOTE:

After diagnosis is completed, reconnect all harness connectors. Then, use CONSULT to enter “Active Test” of

“HVAC”, and perform “MODE2” (cooling operation) and “MODE5” (heating operation) of “HVAC TEST” for the

maximum of 10 minutes. (Refer to

HAC-47, "CONSULT Function"

.) Check that cool air blows during cooling

operation, and that warm air blows during heating operation.

1.

CHECK REFRIGERANT CHANNEL SWITCHING 3 WAY TYPE VALVE CONTROL CIRCUIT FOR OPEN

1. Turn power switch OFF.

2. Disconnect refrigerant channel switching 3 way type valve connector and heat pump control unit connec-

tor.

3. Check continuity between refrigerant channel switching 3 way type valve harness connector and heat

pump control unit harness connector.

NOTE:

Check for any adhering foreign substances, cracking, or damage on the refrigerant channel switching 3

way type valve terminal and heat pump control unit harness connector terminal.

DTC

Items

(CONSULT screen terms)

DTC detection condition

Possible cause

B27F5

3-WAY TYPE VALVE CIRC

When the heat pump control unit detects a mal-
function of the refrigerant channel switching 3
way type valve control signal status, compared
to the valve status of the control that is being
judged.

• Refrigerant channel switching 3

way type valve

• Heat pump control unit
• Harness or connectors

(The heat pump control unit circuit
or refrigerant channel switching 3
way type valve circuit is open or
shorted.)

HAC-170

< DTC/CIRCUIT DIAGNOSIS >

[AUTO A/C (WITH HEAT PUMP)]

B27F5 REFRIGERANT CHANNEL SWITCHING 3 WAY TYPE VALVE

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair harness or connector.

2.

CHECK REFRIGERANT CHANNEL SWITCHING 3 WAY TYPE VALVE CONTROL CIRCUIT FOR SHORT

(BATTERY)
1. Turn power switch ON.

2. Check continuity between heat pump control unit harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair harness or connector.

3.

CHECK REFRIGERANT CHANNEL SWITCHING 3 WAY TYPE VALVE CONTROL CIRCUIT FOR SHORT

(GROUND)
1. Turn power switch OFF.

2. Check continuity between heat pump control unit harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair harness or connector.

4.

CHECK REFRIGERANT CHANNEL SWITCHING 3 WAY TYPE VALVE POWER SUPPLY

1. Turn power switch ON.

2. Check continuity between refrigerant channel switching 3 way type valve harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> GO TO 5.

5.

CHECK A/C RELAY CIRCUIT

Check A/C relay circuit. Refer to

EVC-385, "Diagnosis Procedure"

.

Is the inspection result normal?

YES

>> Repair harness or connector between A/C relay and refrigerant channel switching 3 way type

valve.

NO

>> Repair or replace malfunctioning components.

6.

CHECK HEAT PUMP CONTROL UNIT COMMUNICATION LINE FOR OPEN

Refrigerant channel switching 3 way type valve

Heat pump control unit

Continuity

Connector

Terminal

Connector

Terminal

E91

2

M102

7

Yes

+

−

Voltage

(Approx.)

Heat pump control unit

Connector

Terminal

M102

7

Ground

0 V

Heat pump control unit

—

Continuity

Connector

Terminal

M102

7

Ground

No

+

−

Voltage

(Approx.)

Refrigerant channel switching 3 way type valve

Connector

Terminal

E91

1

Ground

Battery voltage