Nissan Sentra. Manual - part 365

EC-156

< BASIC INSPECTION >

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HOW TO ERASE PERMANENT DTC

5. Select “PERMANENT DTC STATUS” mode with CONSULT.

With GST

1. Turn ignition switch OFF and wait at least 10 seconds.

2. Turn ignition switch ON.

3. Turn ignition switch OFF and wait at least 10 seconds.

4. Turn ignition switch ON.

5. Select Service $0A with GST.
Is any permanent DTC detected?

YES

>> GO TO 1.

NO

>> END

TROUBLE DIAGNOSIS - SPECIFICATION VALUE

EC-157

< DTC/CIRCUIT DIAGNOSIS >

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DTC/CIRCUIT DIAGNOSIS

TROUBLE DIAGNOSIS - SPECIFICATION VALUE

Description

INFOID:0000000009758418

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” 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 (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

INFOID:0000000009758419

1.

START

Make sure 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

- CVT models: After the engine is warmed up to normal operating temperature, drive vehicle until “FLUID

TEMP SE” (CVT fluid temperature sensor signal) indicates more than 60

°C (140°F).

- M/T models: After the engine is warmed up to normal operating temperature, drive vehicle for 5 minutes.

• 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-131, "Work Procedure"

.

2. Select “B/FUEL SCHDL”, “A/F ALPHA-B1” and “MAS A/F SE-B1” in “SPEC” of “DATA MONITOR” mode

of “ENGINE” using CONSULT.

3. Make sure that monitor items are within the SP value.
Is the inspection result normal?

YES

>> END

NO

>> Proceed to 

EC-158, "Diagnosis Procedure"

.

EC-158

< DTC/CIRCUIT DIAGNOSIS >

[MRA8DE]

TROUBLE DIAGNOSIS - SPECIFICATION VALUE

Diagnosis Procedure

INFOID:0000000009758420

OVERALL SEQUENCE

JSBIA1063GB

TROUBLE DIAGNOSIS - SPECIFICATION VALUE

EC-159

< DTC/CIRCUIT DIAGNOSIS >

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DETAILED PROCEDURE

1.

CHECK “A/F ALPHA-B1”

With CONSULT

1. Start engine.

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

EC-157, "Component Function Check"

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3. Select “A/F ALPHA-B1” in “SPEC” of “DATA MONITOR” mode, and make sure that the indication is within

the SP value.

PBIB3213E