Infiniti EX35. Manual - part 683

EC-474

< COMPONENT DIAGNOSIS >

[VQ35HR]

SNOW MODE SWITCH

1.

Turn ignition switch OFF.

2.

Disconnect snow mode switch harness connector.

3.

Turn ignition switch ON.

4.

Check the voltage between snow mode switch harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> GO TO 4.

4.

DETECT MALFUNCTIONING PART

Check the following.
• Harness connectors E106, M6
• IPDM E/R harness connector E7
• 10A fuse (No. 43)
• Harness for open or short between snow mode switch and fuse.

>> Repair open circuit or short to ground or short to power in harness or connectors.

5.

CHECK SNOW MODE SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1.

Turn ignition switch OFF.

2.

Disconnect “unified meter and A/C amp.” harness connector.

3.

Check the continuity between snow mode switch harness connector and “unified meter and A/C amp.”
harness connector.

4.

Also check harness for short to ground and short to power.

Is the inspection result normal?

YES

>> GO TO 10.

NO

>> GO TO 7.

6.

DETECT MALFUNCTIONING PART

Check the following.
• Harness connectors M134, M170
• Harness for open or short between snow mode switch and unified meter and A/C amp..

>> Repair open circuit or short to ground ro short to power.

7.

CHECK GROUND CONNECTION

1.

Turn ignition switch OFF.

2.

Check ground connection M95. Refer to Ground Inspection in 

GI-41, "Circuit Inspection"

.

Is the inspection result normal?

YES

>> GO TO 8.

NO

>> Repair or replace ground connection.

8.

CHECK SNOW MODE INDICATOR LAMP GROUND CIRCUIT FOR OPEN AND SHORT

1.

Check the continuity between snow mode switch harness connector and ground.

Snow mode switch

Ground

Voltage

Connector

Terminal

M176

1

Ground

Battery voltage

Snow mode switch

Unified meter and A/C amp.

Continuity

Connector

Terminal

Connector

Terminal

M176

4

M66

23

Existed

SNOW MODE SWITCH

EC-475

< COMPONENT DIAGNOSIS >

[VQ35HR]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

2.

Also check harness for short to power.

Is the inspection result normal?

YES

>> GO TO 10.

NO

>> GO TO 9.

9.

DETECT MALFUNCTIONING PART

Check the following.
• Harness connectors M134, M170
• Harness for open or short between snow mode switch and ground.

>> Repair open circuit or short to power in harness or connectors.

10.

CHECK SNOW MODE SWITCH

Refer to 

EC-475, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 11.

NO

>> Replace snow mode switch.

11.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-38, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection

INFOID:0000000003133666

1.

CHECK SNOW MODE SWITCH-I

1.

Turn ignition switch OFF.

2.

Disconnect snow mode switch harness connector.

3.

Check the continuity between snow mode switch terminals under the following conditions.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Replace snow mode switch.

2.

CHECK SNOW MODE SWITCH-II

Check the continuity between snow mode switch terminals under the following conditions.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace snow mode switch.

Snow mode switch

Ground

Continuity

Connector

Terminal

M176

2

Ground

Existed

Terminals

Condition

Continuity

1 and 4

Snow mode switch

ON

Existed

OFF

Not Existed

Terminals (Polarity)

Continuity

2 (+) - 4 (–)

Existed

4 (+) - 2 (–)

Not Existed

EC-476

< ECU DIAGNOSIS >

[VQ35HR]

ECM

ECU DIAGNOSIS

ECM

Reference Value

INFOID:0000000003133667

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 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 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 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 - 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

ECM

EC-477

< ECU DIAGNOSIS >

[VQ35HR]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

TP SEN 1-B1

• Ignition switch: ON

(Engine stopped)

• Selector lever: D

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

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

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
• 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
• 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
• 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
• Air conditioner switch: OFF
• No  load

Idle

5% - 35%

2,500 rpm

5% - 35%

Monitor Item

Condition

Values/Status