Infiniti M45 (Y34). Manual - part 352

TROUBLE DIAGNOSIS

EC-97

C

D

E

F

G

H

I

J

K

L

M

A

EC

TBWA0259E

EC-98

TROUBLE DIAGNOSIS

ECM Harness Connector Terminal Layout

ABS002DS

ECM Terminals and Reference Value

ABS002DT

PREPARATION

1.

ECM is located behind the glove box. For this inspection,
remove glove box.

2.

Remove ECM harness protector.

3.

Perform all voltage measurements with the connector con-
nected. Extend tester probe as shown to perform tests easily.

●

Open harness securing clip to make testing easier.

●

Use extreme care not to touch 2 pins at one time.

●

Data is for comparison and may not be exact.

ECM INSPECTION TABLE

Specification data are reference values and are measured between each terminal and ground.
Pulse signal is measured by CONSULT-II.

CAUTION:

Do not 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.

PBIB0075E

PBIB0028E

MEC486B

TROUBLE DIAGNOSIS

EC-99

C

D

E

F

G

H

I

J

K

L

M

A

EC

TER-

MINAL 

NO.

WIRE 

COLOR

ITEM

CONDITION

DATA (DC Voltage)

5
6
7

13
14
15
16
17

B/W
L
BR
P
OR/L
B/R
OR
G

Injector No. 1
Injector No. 2
Injector No. 3
Injector No. 4
Injector No. 5
Injector No. 6
Injector No. 7
Injector No. 8

[Engine is running]

●

Warm-up condition

●

Idle speed

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

BATTERY VOLTAGE

(11 - 14V)

[Engine is running]

●

Warm-up condition

●

Engine speed: 2,000 rpm

BATTERY VOLTAGE

(11 - 14V)

8

BR

Heated oxygen sensor 1 
heater (bank 1)

[Engine is running]

●

Warm-up condition

●

Engine speed: Below 3,000 rpm.

Approximately 7V

[Engine is running]

●

Engine speed: Above 3,000 rpm.

BATTERY VOLTAGE
(11 - 14V)

9

G/Y

Heated oxygen sensor 1 
heater (bank 2)

[Engine is running]

●

Warm-up condition

●

Engine speed: Below 3,000 rpm.

Approximately 7V

[Engine is running]

●

Engine speed: Above 3,000 rpm.

BATTERY VOLTAGE
(11 - 14V)

10

GY

Heated oxygen sensor 2 
heater (bank 1)

[Engine is running]

●

Engine speed is below 3,600 rpm after the 
following conditions are met.

–

Warm-up condition

–

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

[Ignition switch: ON]

●

Engine stopped

[Engine is running]

●

Engine speed: Above 3,600 rpm.

BATTERY VOLTAGE
(11 - 14V)

PBIB0042E

PBIB0043E

PBIB0519E

PBIB0519E

EC-100

TROUBLE DIAGNOSIS

11

G

Heated oxygen sensor 2 
heater (bank 2)

[Engine is running]

●

Engine speed is below 3,600 rpm after the 
following conditions are met.

–

Warm-up condition

–

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

[Ignition switch: ON]

●

Engine stopped

[Engine is running]

●

Engine speed: Above 3,600 rpm.

BATTERY VOLTAGE
(11 - 14V)

12

W/L

Counter current return

[Ignition switch: ON]

BATTERY VOLTAGE
(11 - 14V)

18
19
20
21
29
30
31
32

Y/R
W/G
GY
W/R
GY/R
PU/W
L/R
G/R

Ignition signal No. 1
Ignition signal No. 2
Ignition signal No. 3
Ignition signal No. 4
Ignition signal No. 5
Ignition signal No. 6
Ignition signal No. 7
Ignition signal No. 8

[Engine is running]

●

Warm-up condition

●

Idle speed

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

0 - 0.1V

[Engine is running]

●

Warm-up condition

●

Engine speed: 2,000 rpm.

0 - 0.2V

24

G/W

Air conditioner relay

[Engine is running]

●

Both A/C switch and blower switch: ON
 (Compressor operates).

0 - 1.0V

[Engine is running]

●

A/C switch: OFF.

BATTERY VOLTAGE
(11 - 14V)

25

B/R

Fuel pump control module

[When cranking engine]

0 - 0.5V

[Engine is running]

●

Warm-up condition

●

Idle speed

8 - 12V

26

OR

Throttle control motor relay

[Ignition switch: OFF]

BATTERY VOLTAGE
(11 - 14V)

[Ignition switch: ON]

0 - 1.0V

27

PU

VIAS control solenoid valve

[Engine is running]

●

Selector lever: P or N

0 - 1.0V

[Engine is running]

●

Selector lever: D

BATTERY VOLTAGE
(11 - 14V)

[Engine is running]

●

Engine speed: Above 5,000 rpm

0 - 1.0V

28

L

Cooling fan speed control 
solenoid valve ground

[Engine is running]

Approximately 0V

TER-

MINAL 

NO.

WIRE 

COLOR

ITEM

CONDITION

DATA (DC Voltage)

PBIB0044E

PBIB0045E