Infiniti QX56 (Z62). Manual - part 523

 

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Infiniti QX56 (Z62). Manual - part 523

 

 

EC-70

< SYSTEM DESCRIPTION >

[VK56VD]

DIAGNOSIS SYSTEM (ECM)

*: The item is indicated, but not used.

NOTE:

Any monitored item that does not match the vehicle being diagnosed is deleted from the display automatically.

ACTIVE TEST MODE

Test Item

ECM TEMP 1

°

C or 

°

F

• Displays a temperature calculated from a signal of 

ECM temperature sensor 1.

ECM TEMP 2

°

C or 

°

F

• Displays a temperature calculated from a signal of 

ECM temperature sensor 2.

FUEL PUMP DUTY

%

• The control condition of the fuel pump control mod-

ule (FPCM) (determined by ECM according to the 
input signals) is indicated.

Monitored item

Unit

Description

Remarks

TEST ITEM

CONDITION

JUDGMENT

CHECK ITEM (REMEDY)

VENT CON-
TROL/V

• Ignition switch: ON (Engine 

stopped)

• Turn solenoid valve ON and OFF 

with the CONSULT-III and listen 
to operating sound.

Solenoid valve makes an operating 
sound.

• Harness and connectors
• Solenoid valve

ENG COOLANT 
TEMP

• Engine: Return to the original 

non-standard condition

• Change the engine coolant tem-

perature using CONSULT-III.

If malfunctioning symptom disap-
pears, see CHECK ITEM.

• Harness and connectors
• Engine coolant temperature sen-

sor

• Fuel injector

FUEL INJEC-
TION

• Engine: Return to the original 

non-standard condition

• Change the amount of fuel injec-

tion using CONSULT-III.

If malfunctioning symptom disap-
pears, see CHECK ITEM.

• Harness and connectors
• Fuel injector
• Air fuel ratio (A/F) sensor 1

FUEL/T TEMP 
SEN

• Change the fuel tank temperature using CONSULT-III.

PURG VOL 
CONT/V

• Engine: After warming up, run en-

gine at 1,500 rpm.

• Change the EVAP canister purge 

volume control solenoid valve 
opening percent using CON-
SULT-III.

Engine speed changes according to 
the opening percent.

• Harness and connectors
• Solenoid valve

FAN DUTY CON-
TROL*

• Ignition  switch:  ON
• Change duty ratio using CON-

SULT-III.

Cooling fan speed changes.

• Harness and connectors
• Cooling fan motor
• Cooling fan relay
• Cooling fan control module
• IPDM E/R

ALTERNATOR 
DUTY

• Engine:  Idle
• Change duty ratio using CON-

SULT-III.

Battery voltage changes.

• Harness and connectors
• IPDM E/R
• Alternator

POWER BAL-
ANCE

• Engine: After warming up, idle the 

engine.

• A/C switch OFF
• Selector lever: P or N
• Cut off each injector signal one at 

a time using CONSULT-III.

Engine runs rough or stops.

• Harness and connectors
• Compression
• Fuel injector
• Power transistor
• Spark  plug
• Ignition coil

IGNITION TIM-
ING

• Engine: Return to the original 

non-standard condition

• Timing light: Set
• Retard the ignition timing using 

CONSULT-III.

If malfunctioning symptom disap-
pears, see CHECK ITEM.

• Perform Idle Air Volume Learning.

DIAGNOSIS SYSTEM (ECM)

EC-71

< SYSTEM DESCRIPTION >

[VK56VD]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

*: Leaving cooling fan OFF with CONSULT-III while engine is running may cause the engine to overheat.

DTC & SRT CONFIRMATION MODE

SRT STATUS Mode

For items whose SRT codes are set, “CMPLT” is displayed on the CONSULT-III screen; for items whose SRT
codes are not set, “INCMP” is displayed.

SRT WORK SUPPORT Mode

This mode enables a technician to drive a vehicle to set the SRT while monitoring the SRT status.

DTC WORK SUPPORT Mode

*: DTC P1456 does not apply but appears in DTC Work Support Mode screens.

V/T ASSIGN AN-
GLE

• Engine: Return to the original 

non-standard condition

• Change intake valve timing using 

CONSULT-III.

If malfunctioning symptom disap-
pears, see CHECK ITEM.

• Harness and connectors
• Intake valve timing control sole-

noid valve

FPCM

• Engine: Return to the original 

trouble condition

• Select “LOW”, “MID” and “HI” with 

CONSULT-III.

Fuel pump speed changes or stops.

• Harness and connectors
• Fuel pump control module (FPCM)

TEST ITEM

CONDITION

JUDGMENT

CHECK ITEM (REMEDY)

Test mode

Test item

Corresponding DTC No.

Reference page

HO2S2

HO2S2 (B1) P1146

P0138

EC-249

HO2S2 (B1) P1147

P0137

EC-243

HO2S2 (B1) P0139

P0139

EC-257

HO2S2 (B2) P1166

P0158

EC-249

HO2S2 (B2) P1167

P0157

EC-243

HO2S2 (B2) P0159

P0159

EC-257

A/F SEN1

A/F SEN1 (B1) P1278/P1279

P0133

EC-238

A/F SEN1 (B1) P1276

P0130

EC-228

A/F SEN1 (B2) P1288/P1289

P0153

EC-238

A/F SEN1 (B2) P1286

P0150

EC-228

EVAPORATIVE SYSTEM

EVP V/S LEAK P0456/P1456*

P0456

EC-346, "DTC Logic"

PURG VOL CN/V P1444

P0443

EC-317, "DTC Logic"

PURG FLOW P0441

P0441

EC-312, "DTC Logic"

EC-72

< ECU DIAGNOSIS INFORMATION >

[VK56VD]

ECM

ECU DIAGNOSIS INFORMATION

ECM

Reference Value

INFOID:0000000006217730

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-161, "Description"

.

B/FUEL SCHDL

See 

EC-161, "Description"

.

A/F ALPHA-B1

See 

EC-161, "Description"

.

A/F ALPHA-B2

See 

EC-161, "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 1.5 V

A/F SEN1 (B2)

• Engine: After warming up

Maintaining engine speed at 2,000 rpm

Fluctuates around 1.5 V

HO2S2 (B1)

• Revving engine from idle up to 3,000 rpm quickly after the following condi-

tions 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 up to 3,000 rpm quickly after the following condi-

tions 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 up to 3,000 rpm quickly after the following condi-

tions 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 condi-

tions 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 in-

dication.

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

0.65 - 0.87 V

Accelerator pedal: Fully depressed

4.3 - 4.8 V

ACCEL SEN 2*

1

• Ignition switch: ON

(Engine stopped)

Accelerator pedal: Fully released

0.56 - 0.96 V

Accelerator pedal: Fully depressed

4.0 - 4.8 V

ECM

EC-73

< ECU DIAGNOSIS INFORMATION >

[VK56VD]

C

D

E

F

G

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EC

N

P

O

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

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

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

IGN TIMING

• Engine: After warming up
• Selector lever: P or N position
• A/C switch: OFF
• No  load

Idle

1 - 4

°

BTDC

2,000 rpm

25 - 45

°

BTDC

COMBUSTION

These items are displayed 
but are not applicable to this 
model.

CAL/LD VALUE

• Engine: After warming up
• Selector lever: P or N position
• A/C switch: OFF
• No  load

Idle

5 - 35%

2,500 rpm

5 - 35%

MASS AIRFLOW

• Engine: After warming up
• Selector lever: P or N position
• A/C switch: OFF
• No  load

Idle

2.0 - 6.0 g/s

2,500 rpm

7.0 - 20.0 g/s

PURG VOL C/V

• Engine: After warming up
• Selector lever: P or N position
• A/C switch: OFF
• No  load

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

0%

2,000 rpm

5%

INT/V SOL (B1)

• Engine: After warming up
• Selector lever: P or N position
• A/C switch: OFF
• No  load

Idle

0 - 2%

2,000 rpm

Approx. 0 - 50%

Monitor Item

Condition

Values/Status

 

 

 

 

 

 

 

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