Infiniti G37 Coupe. Manual - part 778

 

  Index      Infiniti     Infiniti G37 Coupe - service repair manual 2008 year

 

Search            

 

 

 

 

 

 

 

 

 

Content   ..  776  777  778  779   ..

 

 

Infiniti G37 Coupe. Manual - part 778

 

 

POWER SUPPLY AND GROUND CIRCUIT FOR AUTO AMP.

HAC-101

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

Component Function Check

INFOID:0000000001675734

1.

CONFIRM SYMPTOM BY PERFORMING THE FOLLOWING OPERATIONAL CHECK

1.

Press AUTO switch and A/C 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-101, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000001675735

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-91, "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-103, "Symptom Table"

 (BASE AUDIO WITHOUT NAVIGATION), 

AV-335,

"Symptom Table"

 (BOSE AUDIO WITHOUT NAVIGATION) or 

AV-596, "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

HAC-102

< ECU DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

ECM

ECU DIAGNOSIS

ECM

Reference Value

INFOID:0000000001910529

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-132, "Description"

.

MAS A/F SE-B2

See 

EC-132, "Description"

.

B/FUEL SCHDL

See 

EC-132, "Description"

.

A/F ALPHA-B1

See 

EC-132, "Description"

.

A/F ALPHA-B2

See 

EC-132, "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

0.45 - 1.00V

Accelerator pedal: Fully depressed

4.4 - 4.8V

ACCEL SEN 2*

1

• Ignition switch: ON

(Engine stopped)

Accelerator pedal: Fully released

0.45 - 1.00V

Accelerator pedal: Fully depressed

4.3 - 4.8V

ECM

HAC-103

< ECU DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

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

BOOST VCUM SW

• Always a certain value is displayed.
• This items are not efficient for CV36 models.

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

7

°

 BTDC

2,000 rpm

25

°

 - 45

°

 BTDC

Monitor Item

Condition

Values/Status

HAC-104

< ECU DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

ECM

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%

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 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%

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

FUEL PUMP RLY

• For 1 seconds after turning ignition switch: ON
• Engine running or cranking

ON

• Except above

OFF

VENT CONT/V

• Ignition switch: ON

OFF

THRTL RELAY

• Ignition switch: ON

ON

HO2S2 HTR (B1)

• Engine speed: Below 3,600 rpm after the following conditions are met.
- Engine: After warming up
- Keeping the engine speed between 3,500 and 4,000 rpm for 1 minute and at 

idle for 1 minute under no load

ON

• Engine speed: Above 3,600 rpm

OFF

HO2S2 HTR (B2)

• Engine speed: Below 3,600 rpm after the following conditions are met.
- Engine: After warming up
- Keeping the engine speed between 3,500 and 4,000 rpm for 1 minute and at 

idle for 1 minute under no load

ON

• Engine speed: Above 3,600 rpm

OFF

I/P PULLY SPD

• Vehicle speed: More than 20 km/h (12 MPH)

Almost the same speed as 
the tachometer indication

VEHICLE SPEED

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

cation.

Almost the same speed as 
the speedometer indication

Monitor Item

Condition

Values/Status

 

 

 

 

 

 

 

Content   ..  776  777  778  779   ..