Nissan Xterra. Manual — part 235
EC-66
< ECU DIAGNOSIS INFORMATION >
[VQ40DE]
ECM
BRAKE SW1
• Ignition switch: ON
Brake pedal: Fully released
ON
Brake pedal: Slightly depressed
OFF
BRAKE SW2
• 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 is between
40km/h (25MPH) and 144km/h
(89MPH)
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 (A/T), Neutral (M/T)
• Air conditioner switch: OFF
• No load
Approx. 2,600 - 3,500 mV
A/F ADJ-B1
• Engine: running
−0.330 - 0.330
A/F ADJ-B2
• Engine: running
−0.330 - 0.330
TUMBLE POS SEN
• Ignition switch: ON
• Engine coolant temperature: Be-
tween –12
°C (10°F) and 20°C
(68
°F)
Accelerator pedal: Fully released
Less than 1.4 V
Accelerator pedal: Fully depressed
More than 2.8 V
INT/A TEMP SE
• Ignition switch: ON
Indicates intake air temperature
ALT DUTY SIG
• Power generation voltage variable control: Operating
ON
• Power generation voltage variable control: Not operating
OFF
EVAP LEAK DIAG
• Ignition switch: ON
Indicates the condition of EVAP
leak diagnosis.
EVAP DIAG READY
• Ignition switch: ON
Indicates the ready condition of
EVAP leak diagnosis.
HO2 S2 DIAG1(B1)
DTC P0139 self-diagnosis (delayed response) is incomplete.
INCMP
DTC P0139 self-diagnosis (delayed response) is complete.
CMPLT
HO2 S2 DIAG1(B2)
DTC P0159 self-diagnosis (delayed response) is incomplete.
INCMP
DTC P0159 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
HO2 S2 DIAG2(B2)
DTC P0159 self-diagnosis (slow response) is incomplete.
INCMP
DTC P0159 self-diagnosis (slow response) is complete.
CMPLT
VTC DTY EX B2*
3
—
—
THRTL STK CNT B1
NOTE:
The item is indicated, but not used.
—
A/F-S ATMSPHRC
CRCT B1
Engine: After warming up, idle the engine
Varies depending on vehicle
environment.
A/F-S ATMSPHRC
CRCT B2
Engine: After warming up, idle the engine
Varies depending on vehicle
environment.
MONITOR ITEM
CONDITION
SPECIFICATION
ECM
EC-67
< ECU DIAGNOSIS INFORMATION >
[VQ40DE]
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
*3: The item is indicated, but not used.
ECM Harness Connector Terminal Layout
INFOID:0000000009483799
ECM Terminal and Reference Value
INFOID:0000000009483800
PREPARATION
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.
A/F-S ATMSPHRC
CRCT UP B1
Engine: Running
Varies depending on the num-
ber of updates.
A/F-S ATMSPHRC
CRCT UP B2
Engine: Running
Varies depending on the num-
ber of updates.
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
DIAG1(B2)
DTC P015C and P015D self-diagnosis is incomplete.
INCMP
DTC P015C and P015D 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
DIAG2(B2)
DTC P014E and P014F self-diagnosis is incomplete.
INCMP
DTC P014E and P014F 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
A/F SEN1
DIAG3(B2)
The vehicle condition is not within the diagnosis range of DTC P014E, P014F,
P015C or P015D.
ABSNT
The vehicle condition is within the diagnosis range of DTC P014E, P014F,
P015C or P015D.
PRSNT
MONITOR ITEM
CONDITION
SPECIFICATION
JSBIA0505ZZ
BBIA0537E
E
C
- 6
8
< ECU DIAGNOSIS INFORMATION >
[VQ40DE]
ECM
Pulse signal is measured by CONSULT.
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.
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
1
V
Throttle control motor relay
power supply
[Ignition switch: ON]
BATTERY VOLTAGE
(11 - 14V)
2
L/W
Throttle control motor (Close)
[Ignition switch: ON]
• Engine: Stopped
• Shift lever: D (A/T), 1st (M/T)
• Accelerator pedal: Fully released
0 - 14V
3
G
A/F sensor 1 heater (Bank 2)
[Engine is running]
• Warm-up condition
• Idle speed
(More than 140 seconds after starting en-
gine)
Approximately 2.9 - 8.8V
5
L/B
Throttle control motor (Open)
[Ignition switch: ON]
• Engine: Stopped
• Shift lever: D (A/T), 1st (M/T)
• Accelerator pedal: Fully depressed
0 - 14V
6
R
A/F sensor 1 heater (Bank 1)
[Engine is running]
• Warm-up condition
• Idle speed
(More than 140 seconds after starting en-
gine)
Approximately 2.9 - 8.8V
9
10
11
BR
G
Y
Ignition signal No. 3
Ignition signal No. 2
Ignition signal No. 1
[Engine is running]
• Warm-up condition
• Idle speed
NOTE:
The pulse cycle changes depending on rpm
at idle
0 - 0.2V
[Engine is running]
• Warm-up condition
• Engine speed: 2,500 rpm
0.1 - 0.4V
PBIB1104E
PBIA8148J
PBIB1105E
PBIA8148J
SEC986C
SEC987C
ECM
EC-69
< ECU DIAGNOSIS INFORMATION >
[VQ40DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
12
BR
ECM ground
[Engine is running]
• Idle speed
Body ground
13
14
15
P
SB
GR
Ignition signal No. 6
Ignition signal No. 5
Ignition signal No. 4
[Engine is running]
• Warm-up condition
• Idle speed
NOTE:
The pulse cycle changes depending on rpm
at idle
0 - 0.2V
[Engine is running]
• Warm-up condition
• Engine speed: 2,500 rpm
0.1 - 0.4V
16
V
ECM ground
[Engine is running]
• Idle speed
Body ground
19
B
Sensor ground
(Throttle position sensor)
[Engine is running]
• Warm-up condition
• Idle speed
Approximately 0V
20
G
Intake manifold runner con-
trol valve position sensor
[Ignition switch: ON]
• Engine coolant temperature: Between –
12
°C (10°F) and 20°C (68°F)
• Accelerator pedal: Fully released
Less than 1.4 V
[Ignition switch: ON]
• Engine coolant temperature: Between –
12
°C (10°F) and 20°C (68°F)
• Accelerator pedal: Slightly depressed
More than 3.0 V
22
W
Throttle position sensor 1
[Ignition switch: ON]
• Engine: Stopped
• Shift lever: D (A/T), 1st (M/T)
• Accelerator pedal: Fully released
More than 0.36V
[Ignition switch: ON]
• Engine: Stopped
• Shift lever: D (A/T), 1st (M/T)
• Accelerator pedal: Fully depressed
Less than 4.75V
23
R
Throttle position sensor 2
[Ignition switch: ON]
• Engine: Stopped
• Shift lever: D (A/T), 1st (M/T)
• Accelerator pedal: Fully released
Less than 4.75V
[Ignition switch: ON]
• Engine: Stopped
• Shift lever: D (A/T), 1st (M/T)
• Accelerator pedal: Fully depressed
More than 0.36V
24
L
Sensor power supply (Throt-
tle position sensor)
[Ignition switch: ON]
Approximately 5V
26
R/B
Power supply for ECM (Back-
up)
[Ignition switch: OFF]
BATTERY VOLTAGE
(11 - 14V)
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
SEC986C
SEC987C
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