Nissan Altima L32. Instruction — part 342
ECM
EC-489
< ECU DIAGNOSIS >
[QR25DE FOR CALIFORNIA]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
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.
PBIA9221J
Terminal No.
Wire
color
Description
Condition
Value
(Approx.)
+
-–
Signal name
Input/
Output
1
Ground
L/G
Tumble control valve motor
(Close)
Output
[Ignition switch ON]
• Engine coolant temperature:
Between 5
°C (41°F) and
60
°C (140°F)
• Accelerator pedal: De-
pressed
→ fully released
Battery voltage appears for about
1 second.
2
Ground
G/W
Throttle control motor relay
power supply
Input
[Ignition switch: ON]
BATTERY VOLTAGE
(11 - 14V)
3
Ground
L/R
Tumble control valve motor
(Open)
Output
[Ignition switch ON]
• Engine coolant temperature:
Between 5
°C (41°F) and
60
°C (140°F)
• Accelerator pedal: Fully re-
leased
→ depressed
Battery voltage appears for about
1 second.
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
JMBIA0082GB
JMBIA0083GB
EC-490
< ECU DIAGNOSIS >
[QR25DE FOR CALIFORNIA]
ECM
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
7
Ground
R
Tumble control valve motor
power supply
Input
[Ignition switch: ON]
BATTERY VOLTAGE
(11 - 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
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)
Terminal No.
Wire
color
Description
Condition
Value
(Approx.)
+
-–
Signal name
Input/
Output
JMBIA0084GB
JMBIA0085GB
JMBIA0086GB
JMBIA0037GB
ECM
EC-491
< ECU DIAGNOSIS >
[QR25DE FOR CALIFORNIA]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
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
17
Ground
L
Heated oxygen sensor 3
heater
Output
[Engine is running]
• Engine speed: Below 3,600
rpm after the following con-
ditions are met
- Engine: after warming up
- Driving for 3 minutes at a
speed of 80 km/h (50 MPH)
or more
(Keep the vehicle speed as
steady as possible during
the cruising.)
10V
[Ignition switch: ON]
• Engine stopped
[Engine is running]
• Engine speed: Above 3,600
rpm
BATTERY VOLTAGE
(11 - 14V)
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-492
< ECU DIAGNOSIS >
[QR25DE 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
34
Ground
W/L
Heated oxygen sensor 3
Input
[Engine is running]
• Revving engine from idle to
3,000 rpm quickly after the
following conditions are met
- Engine: after warming up
- Driving for 3 minutes at a
speed of 80 km/h (50 MPH)
or more
(Keep the vehicle speed as
steady as possible during
the cruising.)
0 - 1.0V
35
Ground
B/Y
Sensor ground
(Heated oxygen sensor 2,
Heated oxygen sensor 3)
—
[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
Terminal No.
Wire
color
Description
Condition
Value
(Approx.)
+
-–
Signal name
Input/
Output
JMBIA0089GB
JMBIA0090GB
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