Infiniti FX35, FX50 (S51). Manual - part 1176

GAS SENSOR

HAC-101

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

Is the inspection result normal?

YES

>> Replace unified meter and A/C amp.

NO

>> Repair harnesses or connectors.

HAC-102

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

IONIZER

IONIZER

Description

INFOID:0000000005246294

Ionizer (1) is attached to the heater & cooling unit assembly (2).

Ionizer has two types of operation mode and emits ions into the air
• Clean mode: Emits positive and negative ions at the same ratio.
• Ion control mode: Emits more negative ions.

Component Function Check

INFOID:0000000005246295

1.

CHECK IONIZER OPERATION SOUND

1.

Turn ignition switch ON.

2.

Press AUTO switch.

3.

Ion indicator is shown on the display.

4.

Check the ionizer operation sound (whirring sound) in the duct by putting an ear to the center ventilator
grille (LH) outlet.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Go to Diagnosis Procedure. Refer to 

HAC-102, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000005246296

1.

CHECK POWER SUPPLY FOR IONIZER

1.

Turn ignition switch OFF.

2.

Disconnect ionizer connector.

3.

Turn ignition switch ON.

4.

Press fan (UP: +) switch.

5.

Check voltage between ionizer harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>>

Check 10A fuse (No. 3, located in the fuse block). Refer to 

PG-156, "Fuse, Connector and Ter-

minal Arrangement"

. 

• If fuse is OK, check harness for open circuit. Repair or replace if necessary.
• If fuse is NG, replace fuse and check for short circuit. Repair or replace if necessary.

2.

CHECK CIRCUIT CONTINUITY BETWEEN IONIZER AND GROUND

1.

Turn ignition switch OFF.

2.

Check continuity between ionizer harness connector and ground.

:

Vehicle front

JSIIA1148ZZ

(+)

(

−

)

Voltage

Ionizer

—

Connector

Terminal

M57

1

Ground

Battery voltage

Ionizer

—

Continuity

Connector

Terminal 

M57

3

Ground

 Existed

IONIZER

HAC-103

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair harnesses or connectors.

3.

CHECK ION ON/OFF SIGNAL

Check voltage between ionizer harness connector and ground.

Is the inspection result normal?

YES

>> Replace ionizer.

NO

>> GO TO 4.

4.

CHECK CIRCUIT CONTINUITY BETWEEN UNIFIED METER AND A/C AMP. AND IONIZER

1.

Turn ignition switch OFF.

2.

Disconnect unified meter and A/C amp. connector.

3.

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

4.

Check continuity between ionizer harness connector and ground.

Is the inspection result normal?

YES

>> Replace unified meter and A/C amp.

NO

>> Repair harnesses or connectors.

(+)

(

−

)

Condition

Voltage

Ionizer

—

Connector

Terminal

M57

4

Ground

Blower motor: OFF

12 V

Blower motor: ON

0 V

Ionizer

Unified meter and A/C amp.

Continuity

Connector

Terminal

Connector

Terminal

M57

4

M66

20

Existed

Ionizer

—

Continuity

Connector

Terminal 

M57

4

Ground

 Not existed

HAC-104

< ECU DIAGNOSIS INFORMATION >

[AUTOMATIC AIR CONDITIONER]

ECM

ECU DIAGNOSIS INFORMATION

ECM

VQ35HR

VQ35HR : Reference Value

INFOID:0000000005597998

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-134, "Description"

.

MAS A/F SE-B2

See 

EC-134, "Description"

.

B/FUEL SCHDL

See 

EC-134, "Description"

.

A/F ALPHA-B1

See 

EC-134, "Description"

.

A/F ALPHA-B2

See 

EC-134, "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 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-III 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

0.45 - 1.0 V

Accelerator pedal: Fully depressed

4.4 - 4.8 V