Nissan Murano. Manual - part 857

HAC-202

< DTC/CIRCUIT DIAGNOSIS >

[WITH 7 INCH DISPLAY]

POWER SUPPLY AND GROUND CIRCUIT

POWER SUPPLY AND GROUND CIRCUIT

A/C AUTO AMP.

A/C AUTO AMP. : Description

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COMPONENT DESCRIPTION

A/C Auto Amp. (Air Conditioner Automatic Amplifier)

The A/C auto amp. (1) has a built-in microcomputer that processes
information sent from various sensors needed for air conditioner
operation. The air mix door motor(s), the mode door motor, the
intake door motor, the upper ventilator door motor, the blower motor
and the compressor are then controlled.
When the various switches and temperature control dial are oper-
ated, data is input to the A/C auto amp. from the AV control unit
using CAN communication.
The A/C auto amp. is operated with control mechanisms. Signals
from various switches and Potentio Temperature Control (PTC) are
directly entered into the A/C auto amp.

Power Supply and Ground Circuit for A/C Auto Amp.

A/C AUTO AMP. : Component Function Check

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1.

CHECK OPERATION

1.

Press the AUTO switch, and then check that “AUTO” is shown on the display. 

2.

Operate the temperature control dial (driver side). Check that the fan speed or outlet changes. (The dis-
charge air temperature or fan speed varies depending on the ambient temperature, in-vehicle tempera-
ture, and temperature setting.) 

Does it operate normally?

YES

>> INSPECTION END

NO

>> Perform trouble diagnosis for the A/C system. Refer to 

HAC-202, "A/C AUTO AMP. : Diagnosis

Procedure"

.  

A/C AUTO AMP. : Diagnosis Procedure

INFOID:0000000009722202

1.

INSPECTION BY FAIL-SAFE FUNCTION

1.

Turn the ignition switch ON.

2.

After approximately 30 seconds, check that the air conditioner is operated by the fail-safe function (the
operation display of air conditioner is not performed). Refer to 

HAC-229, "Fail-Safe"

. 

Is the fail-safe function operated? 

YES

>> GO TO 5.

NO

>> GO TO 2.

2.

CHECK A/C AUTO AMP. POWER SUPPLY CIRCUIT

1.

Disconnect the A/C auto amp. connector. 

2.

Check voltage between A/C auto amp. harness connector and ground. 

JPIIA0609ZZ

JPIIA0617GB

POWER SUPPLY AND GROUND CIRCUIT

HAC-203

< DTC/CIRCUIT DIAGNOSIS >

[WITH 7 INCH DISPLAY]

C

D

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F

G

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A

B

HAC

N

O

P

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> GO TO 3.

3.

CHECK FUSE

Check 10A fuses [Nos. 3, 6 and 19, located in the fuse block (J/B)].
NOTE:
Refer to 

PG-91, "Fuse, Connector and Terminal Arrangement"

.

Is the inspection result normal?

YES

>> Repair the harnesses or connectors.

NO

>> Replace the fuse after repairing the applicable circuit. 

4.

CHECK A/C AUTO AMP. CIRCUIT CONTINUITY

1.

Turn ignition switch OFF.

2.

Check continuity between A/C auto amp. harness connector and ground. 

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Repair the harnesses or connectors.

5.

CHECK PRESET SWITCH

Check the preset switch. Refer to 

AV-155, "Removal and Installation"

 (base audio without navigation), 

AV-286,

"Removal and Installation"

 (bose audio without navigation) or 

AV-458, "Removal and Installation"

 (bose audio

with navigation).

Is the inspection result normal?

YES

>> Replace the A/C auto amp. 

NO

>> Repair or replace parts according to the inspection results.

(+)

(

−

)

Voltage

A/C auto amp.

—

Ignition switch position

Connector

Terminal

OFF

ACC

ON

M50

17

Ground

Approx. 0 V

Battery voltage

Battery voltage

20

Approx. 0 V

Approx. 0 V

Battery voltage

40

Battery voltage

Battery voltage

Battery voltage

A/C auto amp.

—

Continuity

Connector

Terminal

M50

19

Ground

Existed

39

HAC-204

< ECU DIAGNOSIS INFORMATION >

[WITH 7 INCH DISPLAY]

ECM

ECU DIAGNOSIS INFORMATION

ECM

Reference Value

INFOID:0000000009722203

VALUES ON THE DIAGNOSIS TOOL

NOTE:
• The following table includes information (items) inapplicable to this vehicle. For information (items) applica-

ble to this vehicle, refer to CONSULT display items.

• Numerical values in the following table are reference values.
• These values are input/output values that ECM receives/transmits and may differ from actual operations.

Example:
The ignition timing shown by the timing light may differ from the ignition timing displayed on the data monitor.
This occurs because the timing light shows a value calculated by ECM according to signals received from
the cam shaft position sensor and other sensors related to ignition timing.

For outlines of following items, refer to 

EC-129, "CONSULT Function"

.

Monitor Item

Condition

Values/Status

ENG SPEED

Run engine and compare CONSULT value with the tachometer indication.

Almost the same speed as 
the tachometer indication.

MAS A/F SE-B1

See 

EC-140, "Description"

.

B/FUEL SCHDL

See 

EC-140, "Description"

.

A/F ALPHA-B1

See 

EC-140, "Description"

.

A/F ALPHA-B2

See 

EC-140, "Description"

.

COOLANT TEMP/S

• Engine: After warming up

More than 70

°

C (158

°

F)

A/F SEN1 (B1)

• Engine: After warming up

Maintaining engine speed at 2,000 rpm

Fluctuates around 2.2 V

A/F SEN1 (B2)

• Engine: After warming up

Maintaining engine speed at 2,000 rpm

Fluctuates around 2.2 V

HO2S2 (B1)

• Revving engine from idle to 3,000 rpm quickly after the following conditions 

are met.

- Engine: After warming up
- After keeping engine speed between 3,500 and 4,000 rpm for 1 minute and at 

idle for 1 minute under no load

0 - 0.3 V 

←→

 Approx. 0.6 - 

1.0 V

HO2S2 (B2)

• Revving engine from idle to 3,000 rpm quickly after the following conditions 

are met.

- Engine: After warming up
- After keeping engine speed between 3,500 and 4,000 rpm for 1 minute and at 

idle for 1 minute under no load

0 - 0.3 V 

←→

 Approx. 0.6 - 

1.0 V

HO2S2 MNTR (B1)

• Revving engine from idle to 3,000 rpm quickly after the following conditions 

are met.

- Engine: After warming up
- After keeping engine speed between 3,500 and 4,000 rpm for 1 minute and at 

idle for 1 minute under no load

LEAN 

←→

 RICH

HO2S2 MNTR (B2)

• Revving engine from idle to 3,000 rpm quickly after the following conditions 

are met.

- Engine: After warming up
- After keeping engine speed between 3,500 and 4,000 rpm for 1 minute and at 

idle for 1 minute under no load

LEAN 

←→

 RICH

VHCL SPEED SE

• Turn drive wheels and compare CONSULT value with the speedometer indi-

cation.

Almost the same speed as 
speedometer indication

BATTERY VOLT

• Ignition switch: ON (Engine stopped)

11 - 14 V

ACCEL SEN 1

• Ignition switch: ON

(Engine stopped)

Accelerator pedal: Fully released

0.5 - 1.0 V

Accelerator pedal: Fully depressed

4.2 - 4.8 V

ACCEL SEN 2*

1

• Ignition switch: ON

(Engine stopped)

Accelerator pedal: Fully released

0.5 - 1.0 V

Accelerator pedal: Fully depressed

4.2 - 4.8 V

ECM

HAC-205

< ECU DIAGNOSIS INFORMATION >

[WITH 7 INCH DISPLAY]

C

D

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F

G

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A

B

HAC

N

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TP SEN 1-B1

• Ignition switch: ON

(Engine stopped)

• Selector lever: D position

Accelerator pedal: Fully released

More than 0.36 V

Accelerator pedal: Fully depressed

Less than 4.75 V

TP SEN 2-B1*

1

• Ignition switch: ON

(Engine stopped)

• Selector lever: D position

Accelerator pedal: Fully released

More than 0.36 V

Accelerator pedal: Fully depressed

Less than 4.75 V

FUEL T/TMP SE

• Ignition switch: ON

Indicates fuel tank tempera-
ture

INT/A TEMP SE

• Ignition switch: ON

Indicates intake air tempera-
ture

EVAP SYS PRES

• Ignition switch: ON

Approx. 1.8 - 4.8 V

FUEL LEVEL SE

• Ignition switch: ON

Depending on fuel level of 
fuel tank

START SIGNAL

• Ignition switch: ON 

→

 START 

→

 ON

OFF 

→

 ON 

→

 OFF

CLSD THL POS

• Ignition switch: ON

(Engine stopped)

Accelerator pedal: Fully released

ON

Accelerator pedal: Slightly depressed

OFF

AIR COND SIG

• Engine: After warming up, idle the 

engine

Air conditioner switch: OFF

OFF

Air conditioner switch: ON
(Compressor operates.)

ON

P/N POSI SW

• Ignition switch: ON

Selector lever: P or N position

ON

Selector lever: Except above position

OFF

PW/ST SIGNAL

• Engine: After warming up, idle the 

engine

Steering wheel: Not being turned

OFF

Steering wheel: Being turned

ON

LOAD SIGNAL

• Ignition switch: ON

Rear window defogger switch: ON
and/or
Lighting switch: 2nd position

ON

Rear window defogger switch and lighting 
switch: OFF

OFF

IGNITION SW

• Ignition switch: ON 

→

 OFF 

→

 ON

ON 

→

 OFF 

→

 ON

HEATER FAN SW

• Engine: After warming up, idle the 

engine

Heater fan switch: ON

ON

Heater fan switch: OFF

OFF

BRAKE SW

• Ignition switch: ON

Brake pedal: Fully released

OFF

Brake pedal: Slightly depressed

ON

INJ PULSE-B1

• Engine: After warming up
• Selector lever: P or N position
• Air conditioner switch: OFF
• No  load

Idle

2.0 - 3.0 msec

2,000 rpm

1.9 - 2.9 msec

INJ PULSE-B2

• Engine: After warming up
• Selector lever: P or N position
• Air conditioner switch: OFF
• No  load

Idle

2.0 - 3.0 msec

2,000 rpm

1.9 - 2.9 msec

IGN TIMING

• Engine: After warming up
• Selector lever: P or N position
• Air conditioner switch: OFF
• No  load

Idle

7 - 17

°

BTDC

2,000 rpm

25 - 45

°

BTDC

CAL/LD VALUE

• Engine: After warming up
• Selector lever: P or N position
• Air conditioner switch: OFF
• No  load

Idle

5 - 35%

2,500 rpm

5 - 35%

MASS AIRFLOW

• Engine: After warming up
• Selector lever: P or N position
• Air conditioner switch: OFF
• No  load

Idle

2.0 - 6.0 g/s

2,500 rpm

7.0 - 20.0 g/s

Monitor Item

Condition

Values/Status