Infiniti EX35. Manual - part 927

HAC-104

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

POWER SUPPLY AND GROUND CIRCUIT FOR AUTO AMP.

Component Function Check

INFOID:0000000003545643

1.

CONFIRM SYMPTOM BY PERFORMING THE FOLLOWING OPERATIONAL CHECK

1.

Press AUTO switch.

2.

Display should indicate AUTO. Confirm that the compressor clutch engages (sound or visual inspection).
(Discharge air and blower speed depend on ambient, in-vehicle and set temperatures.)

Does magnet clutch engaged?

YES

>> END.

NO

>> Go to Diagnosis Procedure. Refer to 

HAC-104, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000003545644

1.

CHECK POWER SUPPLY CIRCUIT FOR UNIFIED METER AND A/C AMP.

1.

Disconnect unified meter and A/C amp. connector.

2.

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

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> GO TO 2.

2.

CHECK FUSE

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

PG-98, "Fuse, Connector and Ter-

minal Arrangement"

.

Is the inspection result normal?

YES

>> Check harness for open circuit. Repair or replace if necessary.

NO

>> Check harness for short circuit and replace fuse.

3.

CHECK GROUND CIRCUIT FOR UNIFIED METER AND A/C AMP.

1.

Turn ignition switch OFF.

2.

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

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair harness or connector.

4.

CHECK PRESET SWITCH

Check preset switch. Refer to 

AV-148, "Symptom Table"

 (BASE AUDIO WITHOUT NAVIGATION), 

AV-403,

"Symptom Table"

 (BOSE AUDIO WITHOUT NAVIGATION) or 

AV-889, "Symptom Table"

 (BOSE AUDIO WITH

NAVIGATION).

Is the inspection result normal?

YES

>> Replace unified meter and A/C amp.

NO

>> Repair or replace malfunctioning part(s).

(+)

(

−

)

Voltage

Unified meter and A/C amp.

—

Ignition switch position

Connector

Terminal

OFF

ACC

ON

M67

41

Ground

Approx. 0 V

Battery voltage

Battery voltage

53

Approx. 0 V

Approx. 0 V

Battery voltage

54

Battery voltage

Battery voltage

Battery voltage

Unified meter and A/C amp.

—

Continuity

Connector

Terminal

M67

55

Ground

Existed

71

ECM

HAC-105

< ECU DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

ECU DIAGNOSIS

ECM

Reference Value

INFOID:0000000003597535

VALUES ON THE DIAGNOSIS TOOL

NOTE:
• Specification data are reference values.
• Specification data are output/input values which are detected or supplied by the ECM at the connector.

* Specification data may not be directly related to their components signals/values/operations.
i.e. Adjust ignition timing with a timing light before monitoring IGN TIMING, because the monitor may show
the specification data in spite of the ignition timing not being adjusted to the specification data. this IGN TIM-
ING monitors the data calculated by the ECM according to the signals input from the camshaft position sen-
sor and other ignition timing related sensors.

CONSULT-III MONITOR ITEM

Monitor Item

Condition

Values/Status

ENG SPEED

• Run engine and compare CONSULT-III value with the tachometer indication.

Almost the same speed as 
the tachometer indication

MAS A/F SE-B1

See 

EC-125, "Description"

.

MAS A/F SE-B2

See 

EC-125, "Description"

.

B/FUEL SCHDL

See 

EC-125, "Description"

.

A/F ALPHA-B1

See 

EC-125, "Description"

.

A/F ALPHA-B2

See 

EC-125, "Description"

.

COOLAN TEMP/S

• Ignition switch: ON

Indicates engine coolant 
temperature

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 up 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 - 0.3V 

←→

 Approx. 0.6 - 

1.0V

HO2S2 (B2)

• Revving engine from idle up 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 - 0.3V 

←→

 Approx. 0.6 - 

1.0V

HO2S2 MNTR (B1)

• Revving engine from idle up 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 up 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-III value with the speedometer indi-

cation.

Almost the same speed as 
speedometer indication

BATTERY VOLT

• Ignition switch: ON (Engine stopped)

11 - 14V

ACCEL SEN 1

• Ignition switch: ON

(Engine stopped)

Accelerator pedal: Fully released

0.5 - 1.0V

Accelerator pedal: Fully depressed

4.2 - 4.8V

ACCEL SEN 2*

1

• Ignition switch: ON

(Engine stopped)

Accelerator pedal: Fully released

0.5 - 1.0V

Accelerator pedal: Fully depressed

4.2 - 4.8V

HAC-106

< ECU DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

ECM

TP SEN 1-B1

• Ignition switch: ON

(Engine stopped)

• Selector lever: D (A/T) or 1st (M/T)

Accelerator pedal: Fully released

More than 0.36V

Accelerator pedal: Fully depressed

Less than 4.75V

TP SEN 2-B1*

1

• Ignition switch: ON

(Engine stopped)

• Selector lever: D (A/T) or 1st (M/T)

Accelerator pedal: Fully released

More than 0.36V

Accelerator pedal: Fully depressed

Less than 4.75V

FUEL T/TMP SE

• Ignition switch: ON

Indicates fuel tank tempera-
ture

INT/A TEMP SE

• Ignition switch: ON

Indicates intake air temper-
ature

EVAP SYS PRES

• Ignition switch: ON

Approx. 1.8 - 4.8V

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 (A/T), Neutral (M/T)

ON

Selector lever: Except above

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 (A/T), Neu-

tral (M/T)

• 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 (A/T), Neu-

tral (M/T)

• 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 (A/T), Neu-

tral (M/T)

• Air conditioner switch: OFF
• No load

Idle

6

°

 - 16

°

 BTDC (With 4WAS)

10

°

 - 20

°

 BTDC (Without 

4WAS)

2,000 rpm

25

°

 - 45

°

 BTDC

CAL/LD VALUE

• Engine: After warming up
• Selector lever: P or N (A/T), Neu-

tral (M/T)

• Air conditioner switch: OFF
• No load

Idle

5% - 35%

2,500 rpm

5% - 35%

Monitor Item

Condition

Values/Status

ECM

HAC-107

< ECU DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

MASS AIRFLOW

• Engine: After warming up
• Selector lever: P or N (A/T), Neu-

tral (M/T)

• Air conditioner switch: OFF
• No  load

Idle

2.0 - 6.0 g·m/s

2,500 rpm

7.0 - 20.0 g·m/s

PURG VOL C/V

• Engine: After warming up
• Selector lever: P or N (A/T), Neu-

tral (M/T)

• Air conditioner switch: OFF
• No  load

Idle
(Accelerator pedal: Not depressed even 
slightly, after engine starting.)

0%

2,000 rpm

—

INT/V TIM (B1)

• Engine: After warming up
• Selector lever: P or N (A/T), Neu-

tral (M/T)

• Air conditioner switch: OFF
• No  load

Idle

−

5

°

 - 5

°

CA

2,000 rpm

Approx. 0

°

 - 30

°

CA

INT/V TIM (B2)

• Engine: After warming up
• Selector lever: P or N (A/T), Neu-

tral (M/T)

• Air conditioner switch: OFF
• No  load

Idle

−

5

°

 - 5

°

CA

2,000 rpm

Approx. 0

°

 - 30

°

CA

EXH/V TIM B1

• Engine: After warming up
• Selector lever: P or N (A/T), Neu-

tral (M/T)

• Air conditioner switch: OFF
• No  load

Idle

−

5

°

 - 5

°

CA

Around 2,500 rpm while the engine speed 
is rising

Approx. 0

°

 - 30

°

CA

EXH/V TIM B2

• Engine: After warming up
• Selector lever: P or N (A/T), Neu-

tral (M/T)

• Air conditioner switch: OFF
• No  load

Idle

−

5

°

 - 5

°

CA

Around 2,500 rpm while the engine speed 
is rising

Approx. 0

°

 - 30

°

CA

INT/V SOL (B1)

• Engine: After warming up
• Selector lever: P or N (A/T), Neu-

tral (M/T)

• Air conditioner switch: OFF
• No  load

Idle

0% - 2%

2,000 rpm

Approx. 0% - 50%

INT/V SOL (B2)

• Engine: After warming up
• Selector lever: P or N (A/T), Neu-

tral (M/T)

• Air conditioner switch: OFF
• No  load

Idle

0% - 2%

2,000 rpm

Approx. 0% - 50%

VTC DTY EX B1

• Engine: After warming up
• Selector lever: P or N (A/T), Neu-

tral (M/T)

• Air conditioner switch: OFF
• No  load

Idle

0% - 2%

Around 2,500 rpm while the engine speed 
is rising

Approx. 0% - 70%

VTC DTY EX B2

• Engine: After warming up
• Selector lever: P or N (A/T), Neu-

tral (M/T)

• Air conditioner switch: OFF
• No  load

Idle

0% - 2%

Around 2,500 rpm while the engine speed 
is rising

Approx. 0% - 70%

TP SEN 1-B2

• Ignition switch: ON

(Engine stopped)

• Selector lever: D (A/T) or 1st (M/T)

Accelerator pedal: Fully released

More than 0.36V

Accelerator pedal: Fully depressed

Less than 4.75V

TP SEN 2-B2*

1

• Ignition switch: ON

(Engine stopped)

• Selector lever: D (A/T) or 1st (M/T)

Accelerator pedal: Fully released

More than 0.36V

Accelerator pedal: Fully depressed

Less than 4.75V

AIR COND RLY

• Engine: After warming up, idle the 

engine

Air conditioner switch: OFF

OFF

Air conditioner switch: ON
(Compressor operates)

ON

Monitor Item

Condition

Values/Status