Nissan Frontier. Manual - part 374

DIAGNOSIS SYSTEM (ECM)

EC-67

< SYSTEM DESCRIPTION >

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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.

EC-68

< ECU DIAGNOSIS INFORMATION >

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ECM

ECU DIAGNOSIS INFORMATION

ECM

CONSULT Reference Value in Data Monitor Mode

INFOID:0000000009480746

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 camshaft position sensor and other sensors related to ignition timing.

• For outlines of following items, refer to 

EC-58, "CONSULT Function"

.

MONITOR ITEM

CONDITION

SPECIFICATION

ENG SPEED

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

Almost the same speed as 
the tachometer indication.

MAS A/F SE-B1

• See 

EC-138, "Description"

.

B/FUEL SCHDL

• See 

EC-138, "Description"

.

A/F ALPHA-B1

• See 

EC-138, "Description"

.

COOLAN 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 1.5V

HO2S2 (B1)

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

met.

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

1 minute under no load.

0 - 0.3V 

←→ Approx. 0.6 - 

1.0V

HO2S2 MNTR (B1) 

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

met.

- Engine: After warming up
- 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 the CONSULT value with speedometer indica-

tion.

Almost the same speed as 
the speedometer indica-
tion.

BATTERY VOLT

• Ignition switch: ON (Engine stopped)

11 - 14V

ACCEL SEN 1
ACCEL SEN 2*

1

• Ignition switch: ON

(Engine stopped)

Accelerator pedal: Fully released

0.6 - 0.95V

Accelerator pedal: Fully depressed

Less than 4.75V

TP SEN 1-B1
TP SEN 2-B1*

1

• Ignition switch: ON

(Engine stopped)

• Shift lever: D (A/T) or 1st (M/T)

Accelerator pedal: Fully released

More than 0.36V

Accelerator pedal: Fully depressed

Less than 4.75V

FUEL T/TMP SE

• Ignition switch: ON

Indicates fuel tank temper-
ature.

FUEL LEVEL SE

• Ignition switch: ON

Depending on fuel level of 
fuel tank.

EVAP SYS PRES

• Ignition switch: ON

Approx. 1.8 - 4.8V

START SIGNAL

• Ignition switch: ON 

→ START → ON

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 en-

gine

Air conditioner switch: OFF

OFF

Air conditioner switch: ON
(Compressor operates.)

ON

ECM

EC-69

< ECU DIAGNOSIS INFORMATION >

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P/N POSI SW

• Ignition switch: ON

Shift lever: P or N (A/T), Neutral (M/T)

ON

Shift lever: Except above

OFF

PW/ST SIGNAL

• Engine: After warming up, idle the en-

gine

Steering wheel: Not being turned

OFF

Steering wheel: Being turned

ON

LOAD SIGNAL

• Ignition switch: ON

Lighting switch: 2nd

ON

Lighting switch: OFF

OFF

IGNITION SW

• Ignition switch: ON 

→ OFF → ON

ON 

→ OFF → ON

HEATER FAN SW

• Engine: After warming up, idle the en-

gine

Heater fan: Operating

ON

Heater fan: Not operating

OFF

BRAKE SW

• Ignition switch: ON

Brake pedal: Fully released

OFF

Brake pedal: Slightly depressed

ON

INJ PULSE-B1

• Engine: After warming up
• Shift lever: P or N (A/T), Neutral (M/T)
• Air conditioner switch: OFF
• No  load

Idle

2.0 - 3.0 msec

2,000 rpm

1.9 - 4.0 msec

IGN TIMING

• Engine: After warming up
• Shift lever: P or N (A/T), Neutral (M/T)
• Air conditioner switch: OFF
• No  load

Idle

10

° - 20° BTDC

2,000 rpm

25

° - 45° BTDC

CAL/LD VALUE

• Engine: After warming up
• Shift lever: P or N (A/T), Neutral (M/T)
• Air conditioner switch: OFF
• No  load

Idle

10% - 35%

2,500 rpm

10% - 35%

MASS AIRFLOW

• Engine: After warming up
• Shift lever: P or N (A/T), Neutral (M/T)
• Air conditioner switch: OFF
• No  load

Idle

1.0 - 4.0 g/s

2,500 rpm

4.0 - 12.0 g/s

PURG VOL C/V

• Engine: After warming up
• Shift lever: P or N (A/T), Neutral (M/T)
• Air conditioner switch: OFF
• No  load

Idle
(Accelerator pedal is not depressed 
even slightly, after engine starting)

0%

2,000 rpm

—

INT/V TIM (B1)

• Engine: After warming up
• Shift lever: P or N (A/T), Neutral (M/T)
• Air conditioner switch: OFF
• No  load

Idle

−5° - 5°CA

2,000 rpm

Approx. 0

° - 20°CA

INT/V SOL (B1)

• Engine: After warming up
• Shift lever: P or N (A/T), Neutral (M/T)
• Air conditioner switch: OFF
• No  load

Idle

0% - 2%

2,000 rpm

Approx. 0% - 60%

AIR COND RLY

• Engine: After warming up, idle the en-

gine

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 conditions

OFF

VENT CONT/V

• Ignition switch: ON

OFF

THRTL RELAY

• Ignition switch: ON

ON

HO2S2 HTR (B1)

• Engine speed: Below 3,600 rpm after the following conditions are met.
- Engine: After warming up
- Keeping 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

MONITOR ITEM

CONDITION

SPECIFICATION

EC-70

< ECU DIAGNOSIS INFORMATION >

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ECM

I/P PULLY SPD

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

Almost the same speed as 
the speedometer indica-
tion.

VEHICLE SPEED

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

tion.

Almost the same speed as 
the speedometer indica-
tion

IDL A/V LEARN

• Engine: running

Idle air volume learning has not been 
performed 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 mile)

A/F S1 HTR (B1)

• Engine: After warming up, idle the engine

0 - 100%

AC PRESS SEN

• Engine: Idle
• Both A/C switch and blower fan switch: ON (Compressor operates)

1.0 - 4.0V

VHCL SPEED SE

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

tion.

Almost the same speed as 
the speedometer indica-
tion

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

CANCEL SW

• Ignition switch: ON

CANCEL switch: Pressed

ON

CANCEL switch: Released

OFF

RESUME/ACC SW

• Ignition switch: ON

RESUME/ACCELERATE switch: 
Pressed

ON

RESUME/ACCELERATE switch: Re-
leased

OFF

SET SW

• Ignition switch: ON

SET/COAST switch: Pressed

ON

SET/COAST switch: Released

OFF

BRAKE SW1
(ASCD brake switch)

• Ignition switch: ON

• Brake pedal: Fully released (A/T)
• Clutch pedal and/or brake pedal: Fully 

released (M/T)

ON

• Brake pedal: Slightly depressed (A/T)
• Clutch pedal and/or brake pedal: 

Slightly depressed (M/T)

OFF

BRAKE SW2
(STOP lamp switch)

• Ignition switch: ON

Brake pedal: Fully released

OFF

Brake pedal: Slightly depressed

ON

VHCL SPD CUT

• Ignition switch: ON

NON

LO SPEED CUT

• Ignition switch: ON

NON

AT OD MONITOR

• Ignition switch: ON

OFF

AT OD CANCEL

• Ignition switch: ON

OFF

CRUISE LAMP

• Ignition switch: ON

MAIN switch: Pressed at the 1st time 

→ 

at the 2nd time

ON 

→ OFF

SET LAMP

• MAIN switch: ON 
• When vehicle speed is between 

40 km/h (25 MPH) and 144 km/h (89 
MPH)

ASCD: Operating

ON

ASCD: Not operating

OFF

ALT DUTY

• Engine: Idle

0 - 80%

MONITOR ITEM

CONDITION

SPECIFICATION