Infiniti QX56 (Z62). Manual - part 545

EC-158

< BASIC INSPECTION >

[VK56VD]

HOW TO SET SRT CODE

Always drive the vehicle in safe manner according to traffic conditions and obey all traffic laws.

• The time required for each diagnosis varies with road surface conditions, weather, altitude, individual driving

habits, etc.
Zone A refers to the range where the time, required for the diagnosis under normal conditions*, is the short-
est.
Zone B refers to the range where the diagnosis can still be performed if the diagnosis is not completed within
zone A.

*: Normal conditions refer to the following:
• Sea level

JSBIA0413GB

HOW TO SET SRT CODE

EC-159

< BASIC INSPECTION >

[VK56VD]

• Flat road
• Ambient air temperature: 20 - 30

C (68 - 86

• Diagnosis is performed as quickly as possible under normal conditions.

Under different conditions [For example: ambient air temperature other than 20 - 30

C (68 - 86

F)], diagno-

sis may also be performed.

Work Procedure

INFOID:0000000006265595

CHECK DTC

Check DTC.

Is any DTC detected?

YES

>> Repair malfunction(s) and erase DTC. Refer to

EC-98, "DTC Index"

>> GO TO 2.

CHECK SRT STATUS

WITH CONSULT-III

Select “SRT STATUS” in “DTC & SRT CONFIRMATION” mode with CONSULT-III.

WITHOUT CONSULT-III

Perform “SRT status” mode with

EC-60, "On Board Diagnosis Function"

WITH GST

Select Service $01 with GST.
Is SRT code(s) set?

YES

>> END

NO-1

>> With CONSULT-III: GO TO 3.

NO-2

>> Without CONSULT-III: GO TO 4.

DTC CONFIRMATION PROCEDURE

Select “SRT WORK SUPPORT” in “DTC & SRT CONFIRMATION” mode with CONSULT-III.

For SRT(s) that is not set, perform the corresponding “DTC CONFIRMATION PROCEDURE” according to
the “Performance Priority” in the “SRT ITEM” table. Refer to

EC-156, "Description"

Check DTC.

Is any DTC detected?

YES

>> Repair malfunction(s) and erase DTC. Refer to

EC-98, "DTC Index"

>> GO TO 10.

PERFORM ROAD TEST

• Check the “Performance Priority” in the “SRT ITEM” table. Refer to

EC-156, "Description"

• Perform the most efficient SRT set driving pattern to set the SRT properly. Refer to

EC-157, "SRT Set Driv-

ing Pattern"

In order to set all SRTs, the SRT set driving pattern must be performed at least once.

>> GO TO 5.

PATTERN 1

Check the vehicle condition;

Engine coolant temperature is

−

10 to 35

C (14 to 95

F).

Fuel tank temperature is more than 0

C (32

F).

Start the engine.

Keep engine idling until the engine coolant temperature is greater than 70

C (158

NOTE:
ECM terminal voltage is follows;
• Engine coolant temperature
-

−

10 to 35

C (14 to 95

F): 3.0 - 4.3 V

- 70

(158

F): Less than 1.4 V

• Fuel tank temperature: Less than 4.1 V
Refer to

EC-72, "Reference Value"

>> GO TO 6.

EC-160

< BASIC INSPECTION >

[VK56VD]

HOW TO SET SRT CODE

PATTERN 2

Drive the vehicle. And depress the accelerator pedal until vehicle speed is 90 km/h (56 MPH), then
release the accelerator pedal and keep it released for more than 10 seconds.

Depress the accelerator pedal until vehicle speed is 90 km/h (56 MPH) again

NOTE:
• Checking the vehicle speed with GST is advised.
• When steady-state driving is performed again even after it is interrupted, each diagnosis can be conducted.

In this case, the time required for diagnosis may be extended.

>> GO TO 7.

PATTERN 3

• Operate vehicle following the driving pattern shown in the figure.
• Release the accelerator pedal during deceleration of vehicle speed

from 90 km/h (56 MPH) to 0 km/h (0 MPH).

>> GO TO 8.

PATTERN 4

• The accelerator pedal must be held very steady during steady-state driving.
• If the accelerator pedal is moved, the test must be conducted again.

>> GO TO 9.

PATTERN 5

• Cool down the engine so that the engine coolant temperature lowers between 15 - 35

C (59 - 95

F).

CAUTION:

Never turn the ignition switch ON while cooling down the engine.

• Engine coolant temperature at engine start is between 15 – 35

C (59 – 95

F) and has lowered 45

C (113

or more since the latest engine stop.

>> GO TO 10.

10.

CHECK SRT STATUS

WITH CONSULT-III

Select “SRT STATUS” in “DTC & SRT CONFIRMATION” mode with CONSULT-III.

WITHOUT CONSULT-III

Perform “SRT status” mode with

EC-60, "On Board Diagnosis Function"

WITH GST

Select Service $01 with GST.

Is SRT(s) set?

YES

>> END

>> Call TECH LINE or take appropriate action.

PBIB2244E

TROUBLE DIAGNOSIS - SPECIFICATION VALUE

EC-161

< DTC/CIRCUIT DIAGNOSIS >

[VK56VD]

DTC/CIRCUIT DIAGNOSIS

TROUBLE DIAGNOSIS - SPECIFICATION VALUE

Description

INFOID:0000000006217760

The specification (SP) value indicates the tolerance of the value that is displayed in “SPEC” in “DATA MONI-
TOR” mode of CONSULT-III during normal operation of the Engine Control System. When the value in “SPEC”
in “DATA MONITOR” mode is within the SP value, the Engine Control System is confirmed OK. When the
value in “SPEC” in “DATA MONITOR” mode is NOT within the SP value, the Engine Control System may have
one or more malfunctions.
The SP value is used to detect malfunctions that may affect the Engine Control System, but will not illuminate
the MIL.
The SP value will be displayed for the following items:
• B/FUEL SCHDL (The fuel injection pulse width programmed into ECM prior to any learned on board correc-

tion)

• A/F ALPHA-B1/B2 (The mean value of air-fuel ratio feedback correction factor per cycle)
• MAS A/F SE-B1/B2 (The signal voltage of the mass air flow sensor)
• IDLE FUEL PRES MAX/MIN (the signal voltage of the fuel rail pressure sensor)

Component Function Check

INFOID:0000000006217761

PRECONDITIONING

Check that all of the following conditions are satisfied.
TESTING CONDITION
• Vehicle driven distance: More than 5,000 km (3,107 miles)
• Barometric pressure: 98.3 - 104.3 kPa (0.983 - 1.043 bar, 1.003 - 1.064 kg/cm

, 14.25 - 15.12 psi)

• Atmospheric temperature: 20 - 30

C (68 - 86

• Engine coolant temperature: 75 - 95

C (167 - 203

• Transmission: Warmed-up
- After the engine is warmed up to normal operating temperature, drive vehicle until “ATF TEMP 2” (A/T fluid

temperature sensor signal) indicates more than 60

C (140

F).

• Electrical load: Not applied
- Rear window defogger switch, air conditioner switch and lighting switch are OFF. Steering wheel is straight

ahead.

• Engine speed: Idle
• Gear position: Neutral ( or parking)