Nissan Sentra. Manual - part 345

EC-76

< SYSTEM DESCRIPTION >

[MRA8DE]

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

ECM

EC-77

< ECU DIAGNOSIS INFORMATION >

[MRA8DE]

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ECU DIAGNOSIS INFORMATION

ECM

Reference Value

INFOID:0000000009758390

VALUES ON THE DIAGNOSIS TOOL

NOTE:

• The following table includes information (items) inapplicable to this vehicle. For information (items) applica-

ble to this vehicle, refer to CONSULT display items.

• Numerical values in the following table are reference values.

• These values are input/output values that ECM receives/transmits and may differ from actual operations.

Example: The ignition timing shown by the timing light may differ from the ignition timing displayed on the data

monitor. This occurs because the timing light shows a value calculated by ECM according to signals received

from the cam shaft position sensor and other sensors related to ignition timing.

For outlines of following items, refer to 

EC-66, "CONSULT Function"

.

Monitor Item

Condition

Values/Status

ENG SPEED

• Run engine and compare CONSULT value with the tachometer indication.

Almost the same speed as 

the tachometer indication.

MAS A/F SE-B1

See 

EC-158, "Diagnosis Procedure"

.

B/FUEL SCHDL

See 

EC-158, "Diagnosis Procedure"

.

A/F ALPHA-B1

See 

EC-158, "Diagnosis Procedure"

.

COOLANT TEMP/S

• Engine: After warming up

More than 70

°C (158°F)

A/F SEN1 (B1)

• Engine: After warming up

Maintaining engine speed at 2,000 rpm

Fluctuates around 2.2 V

HO2S2 (B1)

• Revving engine from idle up to 3,000 rpm quickly after the following conditions 

are met.

- Engine: After warming up
- After keeping engine speed between 3,500 and 4,000 rpm for 1 minute and at 

idle for 1 minute under no load

0 - 0.3 V 

←→ Approx. 0.6 - 

1.0 V

HO2S2 MNTR(B1)

• Revving engine from idle up to 3,000 rpm quickly after the following conditions 

are met.

- Engine: After warming up
- After keeping engine speed between 3,500 and 4,000 rpm for 1 minute and at 

idle for 1 minute under no load

LEAN 

←→ RICH

VHCL SPEED SE

• Turn drive wheels and compare CONSULT value with the speedometer indi-

cation.

Almost the same speed as 

speedometer indication

BATTERY VOLT

• Ignition switch: ON (Engine stopped)

11 - 14 V

ACCEL SEN 1

• Ignition switch: ON

(Engine stopped)

Accelerator pedal: Fully released

0.5 - 1.0 V

Accelerator pedal: Fully depressed

4.2 - 4.8 V

ACCEL SEN 2*

1

• Ignition switch: ON

(Engine stopped)

Accelerator pedal: Fully released

0.5 - 1.0 V

Accelerator pedal: Fully depressed

4.2 - 4.8 V

TP SEN 1-B1

• Ignition switch: ON

(Engine stopped)

• Selector lever: D (CVT)
• Shifter lever: 1st (M/T)

Accelerator pedal: Fully released

More than 0.36 V

Accelerator pedal: Fully depressed

Less than 4.75 V

TP SEN 2-B1*

1

• Ignition switch: ON

(Engine stopped)

• Selector lever: D
• Shifter lever: 1st (M/T)

Accelerator pedal: Fully released

More than 0.36 V

Accelerator pedal: Fully depressed

Less than 4.75 V

FUEL T/TMP SE

• Ignition switch: ON

Indicates fuel tank tempera-

ture

EVAP SYS PRES

• Ignition switch: ON

Approx. 1.8 - 4.8 V

FUEL LEVEL SE

• Ignition switch: ON

Depending on fuel level of 

fuel tank

EC-78

< ECU DIAGNOSIS INFORMATION >

[MRA8DE]

ECM

START SIGNAL

• Ignition switch ON 

→ START → ON (start switch is released)

Off 

→ On → Off

CLSD THL POS

• Ignition switch: ON

(Engine stopped)

Accelerator pedal: Fully released

On

Accelerator pedal: Slightly depressed

Off

AIR COND SIG

• Engine: After warming up, idle the 

engine

Air conditioner switch: OFF

Off

Air conditioner switch: ON
(A/C compressor operates)

On

PW/ST SIGNAL

• Engine: After warming up, idle the 

engine

Steering wheel: Not being turned

Off

Steering wheel: Being turned

On

LOAD SIGNAL

• Ignition switch: ON

Rear window defogger switch: ON
and/or Lighting switch: 2nd position

On

Rear window defogger switch and lighting 
switch: OFF

Off

IGNITION SW

• Ignition switch: ON 

→ OFF → ON

On 

→ Off → On

HEATER FAN SW

• Engine: After warming up, idle the 

engine

Heater fan switch: ON

On

Heater fan switch: OFF

Off

BRAKE SW

• Ignition switch: ON

Brake pedal: Fully released

Off

Brake pedal: Slightly depressed

On

INJ PULSE-B1

• Engine: After warming up
• Selector lever: P or N
• Air conditioner switch: OFF
• No  load

Idle

2.0 - 3.0 msec

2,000 rpm

1.9 - 2.9 msec

IGN TIMING

• Engine: After warming up
• Selector lever: P or N
• Air conditioner switch: OFF
• No  load

Idle

3

° - 13° BTDC

2,000 rpm

35

° - 55° BTDC

CAL/LD VALUE

• Engine: After warming up
• Selector lever: P or N
• Air conditioner switch: OFF
• No  load

Idle

10% - 35%

2,500 rpm

10% - 35%

MASS AIRFLOW

• Engine: After warming up
• Selector lever: P or N
• Air conditioner switch: OFF
• No  load

Idle

Approx. 2.9 g/s

2,500 rpm

Approx. 5.5 g/s

PURG VOL C/V

• Engine: After warming up
• Selector lever: P or N
• Air conditioner switch: OFF
• No  load

Idle
(Accelerator pedal: Not depressed even 
slightly, after engine starting.)

0%

2,000 rpm

0% - 90%

INT/V TIM(B1)

• Engine: After warming up
• Selector lever: P or N
• Air conditioner switch: OFF
• No  load

Idle

−5°– 5° CA

2,000 rpm

Approx. 0

° - 20° CA

EXH/V TIM B1

• Engine: After warming up
• Selector lever: P or N
• Air conditioner switch: OFF
• No  load

Idle

−5° - 5° CA

2,000 rpm

Approx. 0

° - 40° CA

INT/V SOL (B1)

• Engine: After warming up
• Selector lever: P or N
• Air conditioner switch: OFF
• No  load

Idle

0%– 2%

2,000 rpm

Approx. 0%– 90%

SWRL CONT S/V

• Ignition switch: ON
• Engine coolant temperature: Be-

tween 0

°C (32°F) and 45°C 

(113

°F)

Accelerator pedal: Fully released

On

Accelerator pedal: Fully depressed

Off

Monitor Item

Condition

Values/Status

ECM

EC-79

< ECU DIAGNOSIS INFORMATION >

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VIAS S/V-1

• Engine: After warming up
• Selector lever: P or N
• Air conditioner switch: OFF
• No  load

When revving engine up to 5,250 rpm 
quickly and release the accelerator pedal. 

Off 

→ On → Off

AIR COND RLY

• Engine: After warming up, idle the 

engine

Air conditioner switch: OFF

Off

Air conditioner switch: ON
(Compressor operates)

On

FUEL PUMP RLY

• For 1 second after turning ignition switch: ON
• Engine running or cranking

On

• Except above

Off

VENT CONT/V

• Ignition switch: ON

Off

THRTL RELAY

• Ignition switch: ON

On

COOLING FAN

• Engine: After warming up, idle the 

engine

• Air conditioner switch: OFF

Engine coolant temperature is 97

°C 

(207

°F) or less

Off

Engine coolant temperature between 
98

°C (208°F) and 99°C (210°F) or more

Low

Engine coolant temperature between 
100

°C (212°F) or more

Hi

• Engine: After warming up, idle the 

engine

• Air conditioner switch: ON
• Refrigerant pressure is less than 

1,280 kPa (12.80 bar, 13.05 kg/
cm

2

, 185.6 psi)

Engine coolant temperature is 97

°C 

(207

°F) or less

Low

Engine coolant temperature between 
98

°C (208°F) and 99°C (210°F) or more

Low

Engine coolant temperature between 
100

°C (212°F) or more

Hi

HO2S2 HTR (B1)

• Engine speed: Below 3,600 rpm after the following conditions are met.
- Engine: After warming up
- Keeping the engine speed between 3,500 and 4,000 rpm for 1 minute and at 

idle for 1 minute under no load

On

• Engine speed: Above 3,600 rpm

Off

ALT DUTY SIG

• Power generation voltage variable control: Operating

On

• Power generation voltage variable control: Not operating

Off

I/P PULLY SPD

• Vehicle speed: More than 20 km/h (12 MPH)

Almost the same speed as 

the tachometer indication

VEHICLE SPEED

• Turn drive wheels and compare CONSULT value with the speedometer indi-

cation.

Almost the same speed as 

the speedometer indication

IDL A/V LEARN

• Engine: running

Idle air volume learning has not been per-
formed yet.

YET

Idle air volume learning has already been 
performed successfully.

CMPLT

TRVL AFTER MIL

• Ignition switch: ON

Vehicle has traveled after MIL has turned 
ON.

0 - 65,535 km

(0 - 40,723 miles)

ENG OIL TEMP

• Engine: After warming up

More than 70

°C (158°F)

A/F S1 HTR(B1)

• Engine: After warming up, idle the engine

(More than 260 seconds after starting engine.)

4 - 100%

VHCL SPEED SE

• Turn drive wheels and compare CONSULT value with the speedometer indi-

cation.

Almost the same speed as 

the speedometer indication

SET VHCL SPD

• Engine: Running

ASCD: Operating

The preset vehicle speed is 

displayed

MAIN SW

• Ignition switch: ON

MAIN switch: Pressed

On

MAIN switch: Released

Off

Monitor Item

Condition

Values/Status