Nissan Maxima. Manual - part 416

EC-148

< SYSTEM DESCRIPTION >

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DIAGNOSIS SYSTEM (ECM)

Since the “PERMANENT DTC STATUS” screen displays the previous trip information, repeat the

following twice to update the information: “Ignition switch OFF”, “Wait for more than 10 seconds”

and “Ignition switch ON”.

NOTE:

This mode is not used in regions that permanent DTCs are not regulated by law.

SRT WORK SUPPORT Mode

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

PERMANENT DTC WORK SUPPORT Mode

This mode enables a technician to drive a vehicle to complete the driving pattern that is required for erasing

permanent DTC.

NOTE:

This mode is not used in regions that permanent DTCs are not regulated by law.

JSBIA0062GB

TROUBLE DIAGNOSIS - SPECIFICATION VALUE

EC-149

< DTC/CIRCUIT DIAGNOSIS >

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DTC/CIRCUIT DIAGNOSIS

TROUBLE DIAGNOSIS - SPECIFICATION VALUE

Description

INFOID:0000000010094855

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

TOR” mode of CONSULT during normal operation of the Engine Control System. When the value in “SPEC” in

“DATA MONITOR” mode is NOT within the SP value, the Engine Control System may have one or more mal-

functions.

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 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)

Component Function Check

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1.

START

Check that all of the following conditions are satisfied.

• 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)

• Transmission: Warmed-up

- After the engine is warmed up to normal operating temperature, drive vehicle until “ATF TEMP SEN” in

“DATA MONITOR” mode of “CVT” system indicates less than 0.9 V.

• Electrical load: Not applied

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

ahead.

• Engine speed: Idle

>> GO TO 2.

2.

PERFORM “SPEC” OF “DATA MONITOR” MODE

With CONSULT

NOTE:

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

1. Perform “

EC-14, "BASIC INSPECTION : Special Repair Requirement"

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2. 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.

3. Check that monitor items are within the SP value.
Is the measurement value within the SP value?

YES

>> INSPECTION END

NO

>> Go to 

EC-150, "Diagnosis Procedure"

.

EC-150

< DTC/CIRCUIT DIAGNOSIS >

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TROUBLE DIAGNOSIS - SPECIFICATION VALUE

Diagnosis Procedure

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OVERALL SEQUENCE

JMBIA1468GB

TROUBLE DIAGNOSIS - SPECIFICATION VALUE

EC-151

< DTC/CIRCUIT DIAGNOSIS >

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DETAILED PROCEDURE

1.

CHECK “A/F ALPHA-B1”, “A/F ALPHA-B2”

With CONSULT

1. Start engine.

2. Confirm that the testing conditions are met. Refer to 

EC-149, "Component Function Check"

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3. Select “A/F ALPHA-B1”, “A/F ALPHA-B2” in “SPEC” of “DATA MONITOR” mode, and check that each

indication is within the SP value.

PBIB3214E