Infiniti G37 Coupe. Manual — part 584
ECM
EC-517
< ECU DIAGNOSIS >
[VQ37VHR]
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
TERMINAL LAYOUT
PHYSICAL VALUES
NOTE:
• ECM is located behind the instrument assist lower panel. For this inspection, remove passenger side instru-
ment lower panel.
• Specification data are reference values and are measured between each terminal and ground.
• Pulse signal is measured by CONSULT-III.
VVEL POSITION
SEN-B1
• Engine: After warming up
• Selector lever: P or N (A/T), Neu-
tral (M/T)
• Air conditioner switch: OFF
• No load
Idle
Approx. 0.25 - 1.40V
When revving engine up to 2,000 rpm
quickly
Approx. 0.25 - 4.75V
VVEL POSITION
SEN-B2
• Engine: After warming up
• Selector lever: P or N (A/T), Neu-
tral (M/T)
• Air conditioner switch: OFF
• No load
Idle
Approx. 0.25 - 1.40V
When revving engine up to 2,000 rpm
quickly
Approx. 0.25 - 4.75V
VVEL TIM-B1
• Engine: After warming up
• Selector lever: P or N (A/T), Neu-
tral (M/T)
• Air conditioner switch: OFF
• No load
Idle
Approx. 0 - 20 deg
When revving engine up to 2,000 rpm
quickly
Approx. 0 - 90 deg
VVEL TIM-B2
• Engine: After warming up
• Selector lever: P or N (A/T), Neu-
tral (M/T)
• Air conditioner switch: OFF
• No load
Idle
Approx. 0 - 20 deg
When revving engine up to 2,000 rpm
quickly
Approx. 0 - 90 deg
VVEL LEARN
• Ignition switch: OFF
→
ON
(After warming up)
VVEL learning has not been performed
yet.
YET
VVEL learning has already been per-
formed successfully.
DONE
VVEL SEN LEARN-
B1
• VVEL learning has already been performed successfuly
Approx. 0.30 - 0.80V
VVEL SEN LEARN-
B2
• VVEL learning has already been performed successfuly
Approx. 0.30 - 0.80V
ALT DUTY
• Engine: Idle
0 - 80%
A/F ADJ B1
• Engine: Running
−
0.330 - 0.330
A/F ADJ B2
• Engine: Running
−
0.330 - 0.330
FAN DUTY
• Engine: Running
0 - 100%
ALT DUTY SIG
• Power generation voltage variable control: Operating
ON
• Power generation voltage variable control: Not operating
OFF
Monitor Item
Condition
Values/Status
JMBIA0070ZZ
EC-518
< ECU DIAGNOSIS >
[VQ37VHR]
ECM
Terminal No.
(Wire color)
Description
Condition
Value
(Approx.)
+
-–
Signal name
Input/
Output
1
(W)
128
(B)
A/F sensor 1 heater
(bank 1)
Output
[Engine is running]
• Warm-up condition
• Idle speed
(More than 140 seconds after starting
engine)
2.9 - 8.8V
2
(G)
128
(B)
Throttle control motor
(Open) (bank 1)
Output
[Ignition switch: ON]
• Engine stopped
• Selector lever: D (A/T) or 1st (M/T)
• Accelerator pedal: Fully depressed
0 - 14V
[Ignition switch: ON]
• Engine stopped
• Selector lever: D (A/T) or 1st (M/T)
• Accelerator pedal: Fully released
0 - 14V
3
(R)
128
(B)
Throttle control motor re-
lay power supply (bank
1)
Input
[Ignition switch: ON]
BATTERY VOLTAGE
(11 - 14V)
4
(BR)
128
(B)
Throttle control motor
(Close) (bank 1)
Output
[Ignition switch: ON]
• Engine stopped
• Selector lever: D (A/T) or 1st (M/T)
• Accelerator pedal: In the middle of re-
leasing operation
0 - 14V
5
(GR)
128
(B)
A/F sensor 1 heater
(bank 2)
Output
[Engine is running]
• Warm-up condition
• Idle speed
(More than 140 seconds after starting
engine)
2.9 - 8.8V
8
(B)
—
ECM ground
—
—
—
JMBIA0030GB
JMBIA0031GB
JMBIA0032GB
JMBIA0033GB
JMBIA0030GB
ECM
EC-519
< ECU DIAGNOSIS >
[VQ37VHR]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
11
(GR)
128
(B)
Ignition signal No. 4
Output
[Engine is running]
• Warm-up condition
• Idle speed
NOTE:
The pulse cycle changes depending on
rpm at idle
0 - 0.2V
12
(L)
Ignition signal No. 3
15
(V)
Ignition signal No. 5
16
(G)
Ignition signal No. 2
[Engine is running]
• Warm-up condition
• Engine speed: 2,000 rpm
0.1 - 0.4V
19
(SB)
Ignition signal No. 6
20
(Y)
Ignition signal No. 1
17
(P)
128
(B)
Heated oxygen sensor 2
heater (bank 1)
Output
[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 no load
10V
[Ignition switch: ON]
• Engine stopped
[Engine is running]
• Engine speed: Above 3,600 rpm
BATTERY VOLTAGE
(11 - 14V)
18
(W)
128
(B)
Intake valve timing con-
trol solenoid valve (bank
1)
Output
[Engine is running]
• Warm-up condition
• Idle speed
BATTERY VOLTAGE
(11 - 14V)
[Engine is running]
• Warm-up condition
• Engine speed: 2,000rpm
7 - 12V
Terminal No.
(Wire color)
Description
Condition
Value
(Approx.)
+
-–
Signal name
Input/
Output
JMBIA0035GB
JMBIA0036GB
JMBIA0037GB
JMBIA0038GB
EC-520
< ECU DIAGNOSIS >
[VQ37VHR]
ECM
21
(GR)
128
(B)
EVAP canister purge vol-
ume control solenoid
valve
Output
[Engine is running]
• Idle speed
• Accelerator pedal: Not depressed even
slightly, after engine starting
BATTERY VOLTAGE
(11 - 14V)
[Engine is running]
• Engine speed: About 2,000 rpm (More
than 100 seconds after starting engine)
BATTERY VOLTAGE
(11 - 14V)
22
(R)
128
(B)
Fuel pump relay
Output
[Ignition switch: ON]
• For 1 second after turning ignition switch
ON
[Engine is running]
0 - 1.5V
[Ignition switch: ON]
• More than 1 second after turning ignition
switch ON
BATTERY VOLTAGE
(11 - 14V)
24
(P)
128
(B)
ECM relay
(Self shut-off)
Output
[Engine is running]
[Ignition switch: OFF]
• A few seconds after turning ignition
switch OFF
0 - 1.5V
[Ignition switch: OFF]
• More than a few seconds after turning
ignition switch OFF
BATTERY VOLTAGE
(11 - 14V)
25
(O)
128
(B)
Throttle control motor re-
lay
Output
[Ignition switch: ON
→
OFF]
0 - 1.0V
↓
BATTERY VOLTAGE
(11 - 14V)
↓
0V
[Ignition switch: ON]
0 - 1.0V
28
(BR)
128
(B)
VVEL actuator motor re-
lay abort signal
[VVEL control module]
Output
[Engine is running]
• Warm-up condition
• Idle speed
0V
29
(G)
128
(B)
Intake valve timing con-
trol solenoid valve (bank
2)
Output
[Engine is running]
• Warm-up condition
• Idle speed
BATTERY VOLTAGE
(11 - 14V)
[Engine is running]
• Warm-up condition
• Engine speed: 2,000rpm
7 - 12V
Terminal No.
(Wire color)
Description
Condition
Value
(Approx.)
+
-–
Signal name
Input/
Output
JMBIA0039GB
JMBIA0040GB
JMBIA0038GB
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