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Nissan Altima L32. Manual - part 249

ON BOARD DIAGNOSTIC (OBD) SYSTEM

EC-117

< FUNCTION DIAGNOSIS >

[QR25DE FOR CALIFORNIA]

How to Display SRT Status

WITH CONSULT-III

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

For items whose SRT codes are set, a “CMPLT” is displayed on the CONSULT-III screen; for items whose

SRT codes are not set, “INCMP” is displayed.

NOTE:

Though displayed on the CONSULT-III screen, “HO2S HTR” is not SRT item.

WITH GST

Selecting Service $01 with GST (Generic Scan Tool)

NO TOOLS

A SRT code itself can not be displayed while only SRT status can be.
1. Turn ignition switch ON and wait 20 seconds.
2. SRT status is indicated as shown below.

• When all SRT codes are set, MIL lights up continuously.

*1 “How to Read DTC and 1st Trip DTC” *2 “How to Display SRT Status”

*3 “How to Set SRT Code”

PBIB2320E

EC-118

< FUNCTION DIAGNOSIS >

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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 instrument panel.
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, refer to

EC-475, "Component Func-

tion 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-119

< FUNCTION DIAGNOSIS >

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Diagnostic Test Mode I — Bulb Check

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

EC-

475, "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

When the malfunction is detected.

OFF

No malfunction.

EC-120

< FUNCTION DIAGNOSIS >

[QR25DE FOR CALIFORNIA]

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-527, "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.

Number

Flashes

JMBIA1140GB

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