Infiniti EX35. Manual - part 591

 

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Infiniti EX35. Manual - part 591

 

 

EC-106

< FUNCTION DIAGNOSIS >

[VQ35HR]

ON BOARD DIAGNOSTIC (OBD) SYSTEM

• When any SRT codes are not set, MIL will flash periodically for 10 seconds.

MALFUNCTION INDICATOR LAMP (MIL)

Description

The MIL is located on the combination meter.

1.

The MIL will light up when the ignition switch is turned ON with-
out the engine running. This is a bulb check.
If the MIL does not light up, check MIL circuit. Refer to 

EC-463,

"Component Function Check"

.

2.

When the engine is started, the MIL should go off.
If the MIL remains on, the on board diagnostic system has
detected an engine system malfunction.

On Board Diagnostic System Function

The on board diagnostic system has the following three functions.

PBIB2317E

SEF217U

ON BOARD DIAGNOSTIC (OBD) SYSTEM

EC-107

< FUNCTION DIAGNOSIS >

[VQ35HR]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

Diagnostic Test Mode I — Bulb Check

In this mode, the MIL on the instrument panel should stay ON. If it remains OFF, check MIL circuit. Refer to

EC-463, "Component Function Check"

.

Diagnostic Test Mode I — Malfunction Warning

This DTC number is clarified in Diagnostic Test Mode II (SELF-DIAGNOSTIC RESULTS)

Diagnostic Test Mode II — Self-diagnostic Results

In this mode, the DTC and 1st trip DTC are indicated by the number of blinks of the MIL as shown below.
The DTC and 1st trip DTC are displayed at the same time. If the MIL does not illuminate in diagnostic test
mode I (Malfunction warning), all displayed items are 1st trip DTCs. If only one code is displayed when the MIL
illuminates in diagnostic test mode II (SELF-DIAGNOSTIC RESULTS), it is a DTC; if two or more codes are
displayed, they may be either DTCs or 1st trip DTCs. DTC No. is same as that of 1st trip DTC. These uniden-

Diagnostic Test 
Mode

KEY and ENG. 
Status

Function

Explanation of Function

Mode I

Ignition switch in 
ON position 

Engine stopped

BULB CHECK

This function checks the MIL bulb for damage (blown, open 
circuit, etc.).
If the MIL does not come on, check MIL circuit.

Engine running

MALFUNCTION
WARNING

This is a usual driving condition. When a malfunction is de-
tected twice in two consecutive driving cycles (two trip de-
tection logic), the MIL will light up to inform the driver that a 
malfunction has been detected.
The following malfunctions will light up or blink the MIL in 
the 1st trip.
• Misfire (Possible three way catalyst damage)
• One trip detection diagnoses

Mode II

Ignition switch in 
ON position 

Engine stopped

SELF-DIAGNOSTIC
RESULTS

This function allows DTCs and 1st trip DTCs to be read.

MIL

Condition

ON

When the malfunction is detected.

OFF

No malfunction.

EC-108

< FUNCTION DIAGNOSIS >

[VQ35HR]

ON BOARD DIAGNOSTIC (OBD) SYSTEM

tified codes can be identified by using the CONSULT-III or GST. A DTC will be used as an example for how to
read a code.

A particular trouble code can be identified by the number of four-digit numeral flashes as follows.

The length of time the 1,000th-digit numeral flashes on and off is 1.2 seconds consisting of an ON (0.6-sec-
ond) - OFF (0.6-second) cycle.
The 100th-digit numeral and lower digit numerals consist of a 0.3-second ON and 0.3-second OFF cycle.
A change from one digit numeral to another occurs at an interval of 1.0-second OFF. In other words, the later
numeral appears on the display 1.3 seconds after the former numeral has disappeared.
A change from one trouble code to another occurs at an interval of 1.8-second OFF.
In this way, all the detected malfunctions are classified by their DTC numbers. The DTC 0000 refers to no mal-
function. (See 

EC-514, "DTC Index"

)

How to Switch Diagnostic Test Mode

NOTE:
• It is better to count the time accurately with a clock.
• It is impossible to switch the diagnostic mode when an accelerator pedal position sensor circuit has

a malfunction.

• Always ECM returns to Diagnostic Test Mode I after ignition switch is turned OFF.
HOW TO SET DIAGNOSTIC TEST MODE II (SELF-DIAGNOSTIC RESULTS)
1.

Confirm that accelerator pedal is fully released, turn ignition switch ON and wait 3 seconds.

2.

Repeat the following procedure quickly five times within 5 seconds.

-

Fully depress the accelerator pedal.

-

Fully release the accelerator pedal.

3.

Wait 7 seconds, fully depress the accelerator pedal and keep it for approx. 10 seconds until the MIL starts
blinking.
NOTE:
Do not release the accelerator pedal for 10 seconds if MIL may start blinking on the halfway of this
10 seconds. This blinking is displaying SRT status and is continued for another 10 seconds.

JMBIA1140GB

Number

0

1

2

3

4

5

6

7

8

9

A

B

C

D

E

F

Flashes

10

1

2

3

4

5

6

7

8

9

11

12

13

14

15

16

ON BOARD DIAGNOSTIC (OBD) SYSTEM

EC-109

< FUNCTION DIAGNOSIS >

[VQ35HR]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

4.

Fully release the accelerator pedal.
ECM has entered to Diagnostic Test Mode II (Self-diagnostic results).
NOTE:
Wait until the same DTC (or 1st trip DTC) appears to confirm all DTCs certainly.

HOW TO ERASE DIAGNOSTIC TEST MODE II (SELF-DIAGNOSTIC RESULTS)
1.

Set ECM in Diagnostic Test Mode II (Self-diagnostic results). Refer to “How to Set Diagnostic Test Mode II
(Self-diagnostic Results)”.

2.

Fully depress the accelerator pedal and keep it for more than 10 seconds.
The emission-related diagnostic information has been erased from the backup memory in the ECM.

3.

Fully release the accelerator pedal, and confirm the DTC 0000 is displayed.

• If the battery is disconnected, the DTC will be lost from the backup memory within 24 hours.
• Be careful not to erase the stored memory before starting trouble diagnoses.

OBD System Operation Chart

Relationship Between MIL, 1st Trip DTC, DTC, and Detectable Items

• When a malfunction is detected for the first time, the 1st trip DTC and the 1st trip freeze frame data are

stored in the ECM memory.

• When the same malfunction is detected in two consecutive trips, the DTC and the freeze frame data are

stored in the ECM memory, and the MIL will come on.

• The MIL will go off after the vehicle is driven 3 times (driving pattern B) with no malfunction. The drive is

counted only when the recorded driving pattern is met (as stored in the ECM). If another malfunction occurs
while counting, the counter will reset.

• The DTC and the freeze frame data will be stored until the vehicle is driven 40 times (driving pattern A) with-

out the same malfunction recurring (except for Misfire and Fuel Injection System). For Misfire and Fuel Injec-
tion System, the DTC and freeze frame data will be stored until the vehicle is driven 80 times (driving pattern
C) without the same malfunction recurring. The “TIME” in “SELF-DIAGNOSTIC RESULTS” mode of CON-
SULT-III will count the number of times the vehicle is driven.

• The 1st trip DTC is not displayed when the self-diagnosis results in OK for the 2nd trip.

Summary Chart

For details about patterns B and C under “Fuel Injection System” and “Misfire”, see “EXPLANATION FOR DRIVING PATTERNS FOR
“MISFIRE <EXHAUST QUALITY DETERIORATION>”, “FUEL INJECTION SYSTEM”.

For details about patterns A and B under Other, see “EXPLANATION FOR DRIVING PATTERNS FOR “MISFIRE <EXHAUST QUALITY
DETERIORATION>”, “FUEL INJECTION SYSTEM”.

*1: Clear timing is at the moment OK is detected.

*2: Clear timing is when the same malfunction is detected in the 2nd trip.

Relationship Between MIL, DTC, 1st Trip DTC and Driving Patterns for “Misfire <Exhaust Quality Deterioration>”,
“Fuel Injection System”

PBIB0092E

Items

Fuel Injection System

Misfire

Other

MIL (goes off)

3 (pattern B)

3 (pattern B)

3 (pattern B)

DTC, Freeze Frame Data (no 
display)

80 (pattern C)

80 (pattern C)

40 (pattern A)

1st Trip DTC (clear)

1 (pattern C), *

1

1 (pattern C), *

1

1 (pattern B)

1st Trip Freeze Frame Data 
(clear)

*1, *2

*1, *2

1 (pattern B)

 

 

 

 

 

 

 

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