Nissan Altima L32. Manual - part 465

 

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Nissan Altima L32. Manual - part 465

 

 

ECM

EC-981

< ECU DIAGNOSIS >

[QR25DE EXCEPT FOR CALIFORNIA]

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 internally. Thus, they differ
from ECM terminals voltage signal.
*2: Before measuring the terminal voltage, confirm that the battery is fully charged. Refer to 

PG-3, "How to Handle Battery"

.

TERMINAL LAYOUT

PHYSICAL VALUES

NOTE:

• ECM is located behind the passenger side instrument lower panel. For this inspection, remove passenger

side instrument lower panel.

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

• Pulse signal is measured by CONSULT-III.

CAUTION:

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-

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

BRAKE SW1
(ASCD brake switch)

• Ignition switch: ON

• Brake pedal: Fully released (CVT)
• Brake pedal and clutch pedal: Fully re-

leased (M/T)

ON

• Brake pedal: Slightly depressed (CVT)
• Brake pedal and/or clutch pedal: Slight-

ly 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: 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%

BAT CUR SEN

• Engine speed: Idle
• Battery: Fully charged*

2

• Shift  lever:  P  or  N  (CVT), 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

Monitor Item

Condition

Values/Status

PBIA9221J

EC-982

< ECU DIAGNOSIS >

[QR25DE EXCEPT FOR CALIFORNIA]

ECM

Terminal No.

Wire 

color

Description

Condition

Value

(Approx.)

+

-–

Signal name

Input/

Output

2

Ground

G/W

Throttle control motor relay 
power supply

Input

[Ignition switch: ON]

BATTERY VOLTAGE
(11 - 14V)

4

Ground

BR/Y

A/F sensor 1 heater

Output

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

2.9 - 8.8V

5

Ground

L

Throttle control motor 
(Open)

Output

[Ignition switch: ON]
• Engine stopped
• Shift lever: D (CVT), 1st (M/

T) 

• Accelerator pedal: Fully de-

pressed

0 - 14V

6

Ground

P

Throttle control motor 
(Close)

Output

[Ignition switch: ON]
• Engine stopped
• Shift lever: D (CVT), 1st (M/

T) 

• Accelerator pedal: Fully re-

leased

0 - 14V

9

10

11

21

Ground

L/B

G/R

Y/R
G/Y

Ignition signal No. 3
Ignition signal No. 2
Ignition signal No. 1
Ignition signal No. 4

Output

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

NOTE:
The pulse cycle changes de-
pending on rpm at idle

0 - 0.1V

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

0 - 0.2V

12
16

Ground

B

ECM ground

—

[Engine is running]
• Idle speed

Body ground

JMBIA0082GB

JMBIA0083GB

JMBIA0084GB

JMBIA0085GB

JMBIA0086GB

ECM

EC-983

< ECU DIAGNOSIS >

[QR25DE EXCEPT FOR CALIFORNIA]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

13

Ground

R

Heated oxygen sensor 2 
heater

Output

[Engine is running]
• Engine speed: Below 3,600 

rpm after the following con-
ditions 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

10V

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

rpm

BATTERY VOLTAGE
(11 - 14V)

14

Ground

B/R

Fuel pump relay

Output

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

ignition switch ON

[Engine is running]

0 - 1.0V

[Ignition switch ON]
• More than 1 second after 

turning ignition switch ON

BATTERY VOLTAGE
(11 - 14V)

15

Ground

O

Throttle control motor relay

Output

[Ignition switch: ON 

→ OFF]

0 - 1.0V
↓
BATTERY VOLTAGE
(11 - 14V) 
↓
0V

[Ignition switch: ON]

0 - 1.0V

24

Ground

W/B

ECM relay
(Self shut-off)

Output

[Engine is running]
[Ignition switch: OFF]
• A few seconds after turning 

ignition switch OFF

0 - 1.0V

[Ignition switch: OFF]
• More than a few seconds af-

ter turning ignition switch 
OFF

BATTERY VOLTAGE
(11 - 14V)

25

Ground

P/L

EVAP canister purge volume 
control solenoid valve

Output

[Engine is running]
• Idle speed
• Accelerator pedal: Not de-

pressed even slightly, after 
engine starting

BATTERY VOLTAGE
(11 - 14V)

[Engine is running]
• Engine speed: About 2,000 

rpm (More than 100 sec-
onds after starting engine.)

BATTERY VOLTAGE
(11 - 14V)

Terminal No.

Wire 

color

Description

Condition

Value

(Approx.)

+

-–

Signal name

Input/

Output

JMBIA0037GB

JMBIA0087GB

JMBIA0088GB

EC-984

< ECU DIAGNOSIS >

[QR25DE EXCEPT FOR CALIFORNIA]

ECM

29
30
31
32

Ground

LG/R

R/Y

R/W

R/B

Fuel injector No. 4
Fuel injector No. 3
Fuel injector No. 2
Fuel injector No. 1

Output

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

NOTE:
The pulse cycle changes de-
pending on rpm at idle

BATTERY VOLTAGE
(11 - 14V)

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

BATTERY VOLTAGE
(11 - 14V)

33

Ground

LG

Heated oxygen sensor 2

Input

[Engine is running]
• Revving engine from idle to 

3,000 rpm quickly 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

0 - 1.0V

35

Ground

B/Y

Sensor ground
(Heated oxygen sensor 2)

—

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

0V

36

Ground

B

Sensor ground
(Throttle position sensor)

—

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

0V

37

Ground

W

Throttle position sensor 1

Input

[Ignition switch: ON]
• Engine stopped
• Shift lever: D (CVT), 1st (M/

T)

• Accelerator pedal: Fully re-

leased

More than 0.36V

[Ignition switch: ON]
• Engine stopped
• Shift lever: D (CVT), 1st (M/

T)

• Accelerator pedal: Fully de-

pressed

Less than 4.75V

38

Ground

R

Throttle position sensor 2

Input

[Ignition switch: ON]
• Engine stopped
• Shift lever: D (CVT), 1st (M/

T)

• Accelerator pedal: Fully re-

leased

Less than 4.75V

[Ignition switch: ON]
• Engine stopped
• Shift lever: D (CVT), 1st (M/

T)

• Accelerator pedal: Fully de-

pressed

More than 0.36V

Terminal No.

Wire 

color

Description

Condition

Value

(Approx.)

+

-–

Signal name

Input/

Output

JMBIA0089GB

JMBIA0090GB

 

 

 

 

 

 

 

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