Nissan Frontier. Manual — part 614
ECM
EC-1027
< ECU DIAGNOSIS INFORMATION >
[VQ40DE FOR MEXICO]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
73
Y
Engine coolant temperature
sensor
[Engine is running]
Approximately 0 - 4.8V
Output voltage varies with engine
coolant temperature.
74
W
Heated oxygen sensor 2
(Bank 1)
[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 - Approximately 1.0V
75
B/R
A/F sensor 1 (Bank 2)
[Ignition switch: ON]
Approximately 1.8V
78
GR
Sensor ground
(Heated oxygen sensor 2)
[Engine is running]
• Warm-up condition
• Idle speed
Approximately 0V
79
80
81
P
GR
G
Ignition signal No. 6
Ignition signal No. 4
Ignition signal No. 2
[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
82
B
Sensor ground
(APP sensor 1)
[Engine is running]
• Warm-up condition
• Idle speed
Approximately 0V
83
BG
Sensor ground
(APP sensor 2)
[Engine is running]
• Warm-up condition
• Idle speed
Approximately 0V
85
W
Data link connector
[Ignition switch: ON]
• CONSULT or GST: disconnected
Approximately 5V - Battery volt-
age (11 - 14V)
86
P
CAN communication line
—
—
90
L
Sensor power supply
(APP sensor 1)
[Ignition switch: ON]
Approximately 5V
91
G
Sensor power supply
(APP sensor 2)
[Ignition switch: ON]
Approximately 5V
94
L
CAN communication line
—
—
98
GR
Accelerator pedal position
sensor 2
[Ignition switch: ON]
• Engine: Stopped
• Accelerator pedal: Fully released
0.28 - 0.48V
[Ignition switch: ON]
• Engine: Stopped
• Accelerator pedal: Fully depressed
More than 2.0
TER-
MI-
NAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
SEC986C
SEC987C
EC-1028
< ECU DIAGNOSIS INFORMATION >
[VQ40DE FOR MEXICO]
ECM
99
SB
ASCD steering switch
[Ignition switch: ON]
• ASCD steering switch: OFF
Approximately 4V
[Ignition switch: ON]
• MAIN switch: Pressed
Approximately 0V
[Ignition switch: ON]
• CANCEL switch: Pressed
Approximately 1V
[Ignition switch: ON]
• RESUME/ACCELERATE switch: Pressed
Approximately 3V
[Ignition switch: ON]
• SET/COAST switch: Pressed
Approximately 2V
101
V
Stop lamp switch
[Ignition switch: OFF]
• Brake pedal: Fully released
Approximately 0V
[Ignition switch: OFF]
• Brake pedal: Slightly depressed
BATTERY VOLTAGE
(11 - 14V)
102
O
PNP signal
[Ignition switch: ON]
• Shift lever: P or N
Approximately 0V
[Ignition switch: ON]
• Except above position
BATTERY VOLTAGE
(11 - 14V)
104
W
Throttle control motor relay
[Ignition switch: OFF]
BATTERY VOLTAGE
(11 - 14V)
[Ignition switch: ON]
0 - 1.0V
106
R
Accelerator pedal position
sensor 1
[Ignition switch: ON]
• Engine: Stopped
• Accelerator pedal: Fully released
0.65 - 0.87V
[Ignition switch: ON]
• Engine: Stopped
• Accelerator pedal: Fully depressed
More than 4.3V
107
Y
Fuel tank temperature sensor [Engine is running]
Approximately 0 - 4.8V
Output voltage varies with fuel
tank temperature.
108
LG
Brake pedal position switch
[Ignition switch: ON]
• Brake pedal: Slightly depressed
Approximately 0V
[Ignition switch: ON]
• Brake pedal: Fully released
BATTERY VOLTAGE
(11 - 14V)
109
W/R
Ignition switch
[Ignition switch: OFF]
0V
[Ignition switch: ON]
BATTERY VOLTAGE
(11 - 14V)
111
BR
ECM relay
(Self shut-off)
[Engine is running]
[Ignition switch: OFF]
• For a few seconds after turning ignition
switch OFF
0 - 1.5V
[Ignition switch: OFF]
• More than a few seconds after turning igni-
tion switch OFF
BATTERY VOLTAGE
(11 - 14V)
113
V
Fuel pump relay
[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)
TER-
MI-
NAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
ECM
EC-1029
< ECU DIAGNOSIS INFORMATION >
[VQ40DE FOR MEXICO]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)
*: Before measuring the terminal voltage, confirm that the battery is fully charged. Refer to
.
Fail-Safe Chart
INFOID:0000000009481707
When the DTC listed below is detected, the ECM enters the fail-safe mode and the MIL illuminates.
115
116
B
GR
ECM ground
[Engine is running]
• Idle speed
Body ground
117
G
EVAP canister vent control
valve
[Ignition switch: ON]
BATTERY VOLTAGE
(11 - 14V)
119
120
R
P
Power supply for ECM
[Ignition switch: ON]
BATTERY VOLTAGE
(11 - 14V)
121
R/B
Power supply for ECM (Back-
up)
[Ignition switch: OFF]
BATTERY VOLTAGE
(11 - 14V)
TER-
MI-
NAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
DTC No.
Detected items
Engine operating condition in fail-safe mode
P0102
P0103
Mass air flow sensor circuit Engine speed will not rise more than 2,400 rpm due to the fuel cut.
P0117
P0118
Engine coolant tempera-
ture sensor circuit
Engine coolant temperature will be determined by ECM based on the following condition.
CONSULT displays the engine coolant temperature decided by ECM.
Condition
Engine coolant temperature decided
(CONSULT display)
Just as ignition switch is turned ON
or START
40
°C (104°F)
Approx. 4 minutes after engine
starting
80
°C (176°F)
Except as shown above
40 - 80
°C (104 - 176°F)
(Depends on the time)
When the fail-safe system for engine coolant temperature sensor is activated, the cooling
fan operates while engine is running.
P0122
P0123
P0222
P0223
P2135
Throttle position sensor
The ECM controls the electric throttle control actuator in regulating the throttle opening in
order for the idle position to be within +10 degrees.
The ECM regulates the opening speed of the throttle valve to be slower than the normal
condition.
Therefore, the acceleration will be poor.
P0643
Sensor power supply
ECM stops the electric throttle control actuator control, throttle valve is maintained at a
fixed opening (approx. 5 degrees) by the return spring.
P2100
P2103
Throttle control motor relay ECM stops the electric throttle control actuator control, throttle valve is maintained at a
fixed opening (approx. 5 degrees) by the return spring.
P2101
Electric throttle control
function
ECM stops the electric throttle control actuator control, throttle valve is maintained at a
fixed opening (approx. 5 degrees) by the return spring.
P2118
Throttle control motor
ECM stops the electric throttle control actuator control, throttle valve is maintained at a
fixed opening (approx. 5 degrees) by the return spring.
EC-1030
< ECU DIAGNOSIS INFORMATION >
[VQ40DE FOR MEXICO]
ECM
• When there is an open circuit on MIL circuit, the ECM cannot warn the driver by lighting up MIL when there
is malfunction on engine control system.
Therefore, when electrical controlled throttle and part of ECM related diagnoses are continuously detected
as NG for 5 trips, ECM warns the driver that engine control system malfunctions and MIL circuit is open by
means of operating fail-safe function.
The fail-safe function also operates when above diagnoses except MIL circuit are detected and demands the
driver to repair the malfunction.
DTC Inspection Priority Chart
INFOID:0000000009481708
If some DTCs are displayed at the same time, perform inspections one by one based on the following priority
chart.
NOTE:
• If DTC UXXXX is displayed with other DTC, first perform the trouble diagnosis for DTC U1XXXX.
• If DTC P0607 is displayed with other DTC, first perform the trouble diagnosis for DTC P0607.Refer to
P2119
Electric throttle control ac-
tuator
(When electric throttle control actuator does not function properly due to the return spring
malfunction:)
ECM controls the electric throttle actuator because of regulating the throttle opening
around the idle position. The engine speed will not rise more than 2,000 rpm.
(When throttle valve opening angle in fail-safe mode is not in specified range:)
ECM controls the electric throttle control actuator by regulating the throttle opening to 20
degrees or less.
(When ECM detects the throttle valve is stuck open:)
While the vehicle is being driven, it slows down gradually by fuel cut. After the vehicle
stops, the engine stalls.
The engine can restart in N or P position and engine speed will not exceed 1,000 rpm or
more.
P2122
P2123
P2127
P2128
P2138
Accelerator pedal position
sensor
The ECM controls the electric throttle control actuator in regulating the throttle opening in
order for the idle position to be within +10 degrees.
The ECM regulates the opening speed of the throttle valve to be slower than the normal
condition.
Therefore, the acceleration will be poor.
DTC No.
Detected items
Engine operating condition in fail-safe mode
Engine operating condition in fail-safe mode
Engine speed will not rise more than 2,500 rpm due to the fuel cut
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