Nissan Frontier. Instruction — part 375
ECM
EC-71
< ECU DIAGNOSIS INFORMATION >
[QR25DE]
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 inter-
nally. Thus, they differ from ECM terminals voltage signal.
*2: Before measuring the terminal voltage, confirm that the battery is fully charged. Refer to
ECM Harness Connector Terminal Layout
INFOID:0000000009480747
ECM Terminal and Reference Value
INFOID:0000000009480748
PREPARATION
BAT CUR SEN
• Engine: Idle
• Battery: Fully charged*
2
• Shift lever: P or N (A/T), Neutral (M/T)
• Air conditioner switch: OFF
• No load
Approx. 2,600 - 3,500mV
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
INT/A TEMP SE
• Ignition switch: ON
Indicates intake air tem-
perature.
THRTL STK CNT B1
—
—
EVAP LEAK DIAG
• Ignition switch: ON
Indicates the condition of
EVAP leak diagnosis.
EVAP DIAG READY
• Ignition switch: ON
Indicates the ready condi-
tion of EVAP leak diagno-
sis.
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 DIAG2
(B1)
DTC P014C and P014D self-diagnosis is incomplete.
INCMP
DTC P014C and P014D 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
HO2 S2 DIAG1 (B1)
DTC P0139 self-diagnosis (delayed response) is incomplete.
INCMP
DTC P0139 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
SYSTEM 1 DIAG-
NOSIS A B1
DTC P117A self-diagnosis is incomplete.
INCMP
DTC P117A self-diagnosis is complete.
CMPLT
SYSTEM 1 DIAG-
NOSIS B B1
DTC P117A self-diagnosis is on standby.
ABSENT
DTC P117A self-diagnosis is under diagnosis.
PRSENT
MONITOR ITEM
CONDITION
SPECIFICATION
PBIA9221J
EC-72
< ECU DIAGNOSIS INFORMATION >
[QR25DE]
ECM
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.
Pulse signal is measured by CONSULT.
CAUTION:
Never 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.
BBIA0537E
TERMI-
NAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
2
V
Throttle control motor power
supply
[Ignition switch: ON]
BATTERY VOLTAGE
(11 - 14 V)
4
Y
A/F sensor 1 heater
[Engine is running]
• Warm-up condition
• Idle speed
Approximately 5 V
5
L/B
Throttle control motor (Open)
[Ignition switch: ON]
• Engine: Stopped
• Shift lever: D (A/T) or 1st (M/T)
• Accelerator pedal: Fully depressed
0 - 14 V
6
L/W
Throttle control motor (Close)
[Ignition switch: ON]
• Engine: Stopped
• Shift lever: D (A/T) or 1st (M/T)
• Accelerator pedal: Fully released
0 - 14 V
PBIB1584E
PBIB0533E
PBIB0534E
ECM
EC-73
< ECU DIAGNOSIS INFORMATION >
[QR25DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
9
L
Ignition signal No. 3
[Engine is running]
• Warm-up condition
• Idle speed
NOTE:
The pulse cycle changes depending on
rpm at idle.
0 - 0.1 V
[Engine is running]
• Warm-up condition
• Engine speed: 2,000 rpm
0 - 0.2 V
10
G
Ignition signal No. 2
[Engine is running]
• Warm-up condition
• Idle speed
NOTE:
The pulse cycle changes depending on
rpm at idle.
0 - 0.1 V
[Engine is running]
• Warm-up condition
• Engine speed: 2,000 rpm
0 - 0.2 V
11
Y
Ignition signal No. 1
[Engine is running]
• Warm-up condition
• Idle speed
NOTE:
The pulse cycle changes depending on
rpm at idle.
0 - 0.1 V
[Engine is running]
• Warm-up condition
• Engine speed: 2,000 rpm
0 - 0.2 V
12
BR
ECM ground
—
—
TERMI-
NAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
PBIB0521E
PBIB0522E
PBIB0521E
PBIB0522E
PBIB0521E
PBIB0522E
EC-74
< ECU DIAGNOSIS INFORMATION >
[QR25DE]
ECM
13
P
Heated oxygen sensor 2
heater
[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 on load
Approximately 5 V
[Ignition switch: ON]
• Engine: Stopped
[Engine is running]
• Engine speed: Above 3,600 rpm
BATTERY VOLTAGE
(11 - 14 V)
14
V
Fuel pump relay
[Ignition switch: ON]
• For 1 second after turning ignition switch
ON
[Engine is running]
0 - 1.0 V
[Ignition switch: ON]
• More than 1 second after turning ignition
switch ON
BATTERY VOLTAGE
(11 - 14 V)
15
O
Throttle control motor relay
[Ignition switch: OFF]
BATTERY VOLTAGE
(11 - 14 V)
[Ignition switch: ON]
0 - 1.0 V
16
B
ECM ground
—
—
21
GR
Ignition signal No. 4
[Engine is running]
• Warm-up condition
• Idle speed
NOTE:
The pulse cycle changes depending on
rpm at idle.
0 - 0.1 V
[Engine is running]
• Warm-up condition
• Engine speed: 2,000 rpm
0 - 0.2 V
24
BR
ECM relay (Self shut-off)
[Engine is running]
[Ignition switch: OFF]
• For a few seconds after turning ignition
switch OFF
0 - 1.0 V
[Ignition switch: OFF]
• More than a few seconds after turning igni-
tion switch OFF
BATTERY VOLTAGE
(11 - 14 V)
TERMI-
NAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
SEC981D
PBIB0521E
PBIB0522E
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