Infiniti QX56 (JA60). Manual - part 355

 

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Infiniti QX56 (JA60). Manual - part 355

 

 

EC-72

< FUNCTION DIAGNOSIS >

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ON BOARD DIAGNOSTIC (OBD) SYSTEM

*: DTC P1442 and P1456 does not apply to JA60 models but appears in DTC Work Support Mode screens.

Generic Scan Tool (GST) Function

INFOID:0000000005149080

DESCRIPTION

Generic Scan Tool (OBDII scan tool) complying with SAE J1978 has

8 different functions explained below.

ISO15765-4 is used as the protocol.

The name GST or Generic Scan Tool is used in this service manual.

FUNCTION

Test mode

Test item

Corresponding DTC No.

Reference page

EVAPORATIVE
SYSTEM

PURG FLOW P0441

P0441

EC-213

EVP SML LEAK P0442/P1442*

P0442

EC-218

P0455

EC-254

EVP V/S LEAK P0456/P1456*

P0456

EC-261

PURG VOL CN/V P1444

P0443

EC-225

A/F SEN1

A/F SEN1 (B1) P1276

P0130

EC-137

A/F SEN1 (B1) P1278/P1279

P0133

EC-149

A/F SEN1 (B2) P1286

P0150

EC-137

A/F SEN1 (B2) P1288/P1289

P0153

EC-149

HO2S2

HO2S2 (B1) P0139

P0139

EC-167

HO2S2 (B1) P1146

P0138

EC-160

HO2S2 (B1) P1147

P0137

EC-155

HO2S2 (B2) P0159

P0159

EC-167

HO2S2 (B2) P1166

P0158

EC-160

HO2S2 (B2) P1167

P0157

EC-155

SEF139P

Diagnostic test mode

Function

Service $01

READINESS TESTS

This diagnostic service gains access to current emission-related data values, including an-
alog inputs and outputs, digital inputs and outputs, and system status information.

Service $02

(FREEZE DATA)

This diagnostic service gains access to emission-related data value which were stored by 
ECM during the freeze frame. For details, refer to 

EC-459, "DTC Index"

.

Service $03

DTCs

This diagnostic service gains access to emission-related power train trouble codes which 
were stored by ECM.

Service $04

CLEAR DIAG INFO

This diagnostic service can clear all emission-related diagnostic information. This in-
cludes:
• Clear number of diagnostic trouble codes (Service $01)
• Clear diagnostic trouble codes (Service $03)
• Clear trouble code for freeze frame data (Service $01)
• Clear freeze frame data (Service $02)
• Reset status of system monitoring test (Service $01)
• Clear on board monitoring test results (Service $06 and $07)

Service $06

(ON BOARD TESTS)

This diagnostic service accesses the results of on board diagnostic monitoring tests of 
specific components/systems that are not continuously monitored.

ON BOARD DIAGNOSTIC (OBD) SYSTEM

EC-73

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INSPECTION PROCEDURE

1. Turn ignition switch OFF.
2. Connect GST to data link connector, which is located under LH

dash panel near the hood opener handle.

3. Turn ignition switch ON.
4. Enter the program according to instruction on the screen or in

the operation manual.

(*: Regarding GST screens in this section, sample screens are

shown.)

5. Perform each diagnostic service according to each service pro-

cedure.

For further information, see the GST Operation Manual of

the tool maker.

Service $07

(ON BOARD TESTS)

This diagnostic service enables the off board test drive to obtain test results for emission-
related powertrain components/systems that are continuously monitored during normal 
driving conditions.

Service $08

This diagnostic service can close EVAP system in ignition switch ON position (Engine 
stopped). When this diagnostic service is performed, the EVAP canister vent control valve 
can be closed.
In the following conditions, this diagnostic service cannot function.
• Low ambient temperature
• Low battery voltage
• Engine running
• Ignition switch OFF
• Low fuel temperature
• Too much pressure is applied to EVAP system

Service $09

(CALIBRATION ID)

This diagnostic service enables the off-board test device to request specific vehicle infor-
mation such as Vehicle Identification Number (VIN) and Calibration IDs.

Diagnostic test mode

Function

BBIA0369E

SEF398S

SEF416S

EC-74

< COMPONENT DIAGNOSIS >

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TROUBLE DIAGNOSIS - SPECIFICATION VALUE

COMPONENT DIAGNOSIS

TROUBLE DIAGNOSIS - SPECIFICATION VALUE

Description

INFOID:0000000005149081

The specification (SP) value indicates the tolerance of the value that is displayed in “SPEC” of “DATA MONI-

TOR” mode with CONSULT-III during normal operation of the Engine Control System. When the value in 

“SPEC” of “DATA MONITOR” mode is within the SP value, the Engine Control System is confirmed OK. When

the value in “SPEC” of “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 light the

MIL.

The SP value will be displayed for the following three 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 (The signal voltage of the mass air flow sensor)

Testing Condition

INFOID:0000000005149082

• Vehicle driven distance: More than 5,000 km (3,107 miles)
• Barometric pressure: 98.3 - 104.3 kPa (1.003 - 1.064 kg/cm

2

, 14.25 - 15.12 psi)

• Atmospheric temperature: 20 - 30

°C (68 - 86°F)

• Engine coolant temperature: 75 - 95

°C (167 - 203°F)

• Engine speed: Idle

• Transmission: Warmed-up

- After the engine is warmed up to normal operating temperature, drive vehicle until “ATF TEMP SE 1” (A/T

fluid temperature sensor signal) indicates more than 60

°C (140°F).

• Electrical load: Not applied

- Rear window defogger switch, air conditioner switch, lighting switch are OFF. Steering wheel is straight

ahead.

Inspection Procedure

INFOID:0000000005149083

NOTE:

Perform “SPEC” in “DATA MONITOR” mode in maximum scale display.
1. Perform 

EC-13, "Basic Inspection"

.

2. Confirm that the testing conditions indicated above are met.
3. Select “B/FUEL SCHDL”, “A/F ALPHA-B1”, “A/F ALPHA-B2” and “MAS A/F SE-B1” in “SPEC” of “DATA

MONITOR” mode with CONSULT-III.

4. Make sure that monitor items are within the SP value.
5. If NG, go to 

EC-75, "Diagnosis Procedure"

.

TROUBLE DIAGNOSIS - SPECIFICATION VALUE

EC-75

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Diagnosis Procedure

INFOID:0000000005149084

OVERALL SEQUENCE

PBIB2268E

 

 

 

 

 

 

 

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