Nissan Frontier. Manual - part 375

 

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Nissan Frontier. Manual - part 375

 

 

ECM

EC-71

< ECU DIAGNOSIS INFORMATION >

[QR25DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

*1: Accelerator pedal position sensor 2 signal and throttle position sensor 2 signal are converted by ECM inter-

nally. Thus, they differ from ECM terminals voltage signal.

*2: Before measuring the terminal voltage, confirm that the battery is fully charged. Refer to 

PG-4, "How to

Handle Battery"

.

ECM Harness Connector Terminal Layout

INFOID:0000000009480747

ECM Terminal and Reference Value

INFOID:0000000009480748

PREPARATION

BAT CUR SEN

• Engine: Idle
• Battery: Fully charged*

2

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

Approx. 2,600 - 3,500mV

ALT DUTY SIG

• Power generation voltage variable control: Operating

ON

• Power generation voltage variable control: Not operating

OFF

A/F ADJ-B1

• Engine: running

- 0.330 - 0.330

INT/A TEMP SE

• Ignition switch: ON

Indicates intake air tem-
perature.

THRTL STK CNT B1

—

—

EVAP LEAK DIAG

• Ignition switch: ON

Indicates the condition of 
EVAP leak diagnosis.

EVAP DIAG READY

• Ignition switch: ON

Indicates the ready condi-
tion of EVAP leak diagno-
sis.

A/F SEN1 DIAG1 
(B1)

DTC P015A and P015B self-diagnosis is incomplete.

INCMP

DTC P015A and P015B self-diagnosis is complete.

CMPLT

A/F SEN1 DIAG2 
(B1)

DTC P014C and P014D self-diagnosis is incomplete.

INCMP

DTC P014C and P014D self-diagnosis is complete.

CMPLT

A/F SEN1 DIAG3 
(B1)

The vehicle condition is not within the diagnosis range of DTC P014C, P014D, 
P015A or P015B.

ABSNT

The vehicle condition is within the diagnosis range of DTC P014C, P014D, P015A 
or P015B.

PRSNT

HO2 S2 DIAG1 (B1)

DTC P0139 self-diagnosis (delayed response) is incomplete.

INCMP

DTC P0139 self-diagnosis (delayed response) is complete.

CMPLT

HO2 S2 DIAG2 (B1)

DTC P0139 self-diagnosis (slow response) is incomplete.

INCMP

DTC P0139 self-diagnosis (slow response) is complete.

CMPLT

SYSTEM 1 DIAG-
NOSIS A B1

DTC P117A self-diagnosis is incomplete.

INCMP

DTC P117A self-diagnosis is complete.

CMPLT

SYSTEM 1 DIAG-
NOSIS B B1

DTC P117A self-diagnosis is on standby.

ABSENT

DTC P117A self-diagnosis is under diagnosis.

PRSENT

MONITOR ITEM

CONDITION

SPECIFICATION

PBIA9221J

EC-72

< ECU DIAGNOSIS INFORMATION >

[QR25DE]

ECM

ECM located in the engine room passenger side behind reservoir

tank.

ECM INSPECTION TABLE

Specification data are reference values and are measured between each terminal and ground.

Pulse signal is measured by CONSULT.

CAUTION:

Never use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-

age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

BBIA0537E

TERMI-

NAL 

NO.

WIRE 

COLOR

ITEM

CONDITION

DATA (DC Voltage)

2

V

Throttle control motor power 
supply

[Ignition switch: ON]

BATTERY VOLTAGE
(11 - 14 V)

4

Y

A/F sensor 1 heater

[Engine is running]
• Warm-up condition
• Idle speed

Approximately 5 V

5

L/B

Throttle control motor (Open)

[Ignition switch: ON]
• Engine: Stopped
• Shift lever: D (A/T) or 1st (M/T)
• Accelerator pedal: Fully depressed

0 - 14 V

6

L/W

Throttle control motor (Close)

[Ignition switch: ON]
• Engine: Stopped
• Shift lever: D (A/T) or 1st (M/T)
• Accelerator pedal: Fully released

0 - 14 V

PBIB1584E

PBIB0533E

PBIB0534E

ECM

EC-73

< ECU DIAGNOSIS INFORMATION >

[QR25DE]

C

D

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EC

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9

L

Ignition signal No. 3

[Engine is running]
• Warm-up condition
• Idle speed

NOTE:
The pulse cycle changes depending on 
rpm at idle.

0 - 0.1 V

[Engine is running]
•  Warm-up condition
• Engine speed: 2,000 rpm

0 - 0.2 V

10

G

Ignition signal No. 2

[Engine is running]
• Warm-up condition
• Idle speed

NOTE:
The pulse cycle changes depending on 
rpm at idle.

0 - 0.1 V

[Engine is running]
•  Warm-up condition
• Engine speed: 2,000 rpm

0 - 0.2 V

11

Y

Ignition signal No. 1

[Engine is running]
• Warm-up condition
• Idle speed

NOTE:
The pulse cycle changes depending on 
rpm at idle.

0 - 0.1 V

[Engine is running]
•  Warm-up condition
• Engine speed: 2,000 rpm

0 - 0.2 V

12

BR

ECM ground

—

—

TERMI-

NAL 

NO.

WIRE 

COLOR

ITEM

CONDITION

DATA (DC Voltage)

PBIB0521E

PBIB0522E

PBIB0521E

PBIB0522E

PBIB0521E

PBIB0522E

EC-74

< ECU DIAGNOSIS INFORMATION >

[QR25DE]

ECM

13

P

Heated oxygen sensor 2 
heater

[Engine is running]
• 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 on load

Approximately 5 V

[Ignition switch: ON]
• Engine: Stopped
[Engine is running]
• Engine speed: Above 3,600 rpm

BATTERY VOLTAGE
(11 - 14 V)

14

V

Fuel pump relay

[Ignition switch: ON]
• For 1 second after turning ignition switch 

ON

[Engine is running]

0 - 1.0 V

[Ignition switch: ON]
• More than 1 second after turning ignition 

switch ON

BATTERY VOLTAGE
(11 - 14 V)

15

O

Throttle control motor relay

[Ignition switch: OFF]

BATTERY VOLTAGE
(11 - 14 V)

[Ignition switch: ON]

0 - 1.0 V

16

B

ECM ground

—

—

21

GR

Ignition signal No. 4

[Engine is running]
• Warm-up condition
• Idle speed

NOTE:
The pulse cycle changes depending on 
rpm at idle.

0 - 0.1 V

[Engine is running]
•  Warm-up condition
• Engine speed: 2,000 rpm

0 - 0.2 V

24

BR

ECM relay (Self shut-off)

[Engine is running]
[Ignition switch: OFF]
• For a few seconds after turning ignition 

switch OFF

0 - 1.0 V

[Ignition switch: OFF]
• More than a few seconds after turning igni-

tion switch OFF

BATTERY VOLTAGE
(11 - 14 V)

TERMI-

NAL 

NO.

WIRE 

COLOR

ITEM

CONDITION

DATA (DC Voltage)

SEC981D

PBIB0521E

PBIB0522E

 

 

 

 

 

 

 

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