Nissan Frontier. Instruction — part 492
ECM
EC-539
< ECU DIAGNOSIS INFORMATION >
[VQ40DE FOR USA AND CANADA]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
89
G
Crankshaft position sensor
(POS)
[Engine is running]
• Warm-up condition
• Idle speed
NOTE:
The pulse cycle changes depending on rpm
at idle
Approximately 10V
[Engine is running]
• Engine speed: 2,000 rpm
Approximately 10V
91
SHIELD
Sensor ground
(Knock sensor)
[Engine is running]
• Idle speed
Body ground
93
Y
Camshaft position sensor
(PHASE) (Bank 2)
[Engine is running]
• Warm-up condition
• Idle speed
NOTE:
The pulse cycle changes depending on rpm
at idle
1.0 - 4.0V
[Engine is running]
• Engine speed: 2,000 rpm
1.0 - 4.0V
94
L
Camshaft position sensor
(PHASE) (Bank 1)
[Engine is running]
• Warm-up condition
• Idle speed
NOTE:
The pulse cycle changes depending on rpm
at idle
1.0 - 4.0V
[Engine is running]
• Engine speed: 2,000 rpm
1.0 - 4.0V
96
P
Sensor power supply
(Refrigerant pressure sensor)
[Ignition switch: ON]
Approximately 5V
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
PBIB1041E
PBIB1042E
PBIB1039E
PBIB1040E
PBIB1039E
PBIB1040E
EC-540
< ECU DIAGNOSIS INFORMATION >
[VQ40DE FOR USA AND CANADA]
ECM
97
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
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
99
L
Sensor power supply
(APP sensor 1)
[Ignition switch: ON]
Approximately 5V
100
B
Sensor ground
(APP sensor 1)
[Engine is running]
• Warm-up condition
• Idle speed
Approximately 0V
101
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
102
W
EVAP control system pres-
sure sensor
[Ignition switch: ON]
Approximately 1.8 - 4.8V
103
LG
Sensor power supply
(APP sensor 2)
[Ignition switch: ON]
Approximately 5V
104
V
Data link connector
[Ignition switch: ON]
• CONSULT or GST: disconnected
Approximately 5V - Battery volt-
age (11 - 14V)
106
G
EVAP canister vent control
valve
[Ignition switch: ON]
BATTERY VOLTAGE
(11 - 14V)
107
SB
Sensor power supply
(EVAP control system pres-
sure sensor)
[Ignition switch: ON]
Approximately 5V
108
R
Sensor ground
(ASCD steering switch)
—
—
109
W/R
Ignition switch
[Ignition switch: OFF]
0V
[Ignition switch: ON]
BATTERY VOLTAGE
(11 - 14V)
111
Y
Fuel tank temperature sensor [Engine is running]
Approximately 0 - 4.8V
Output voltage varies with fuel
tank temperature.
112
B
Sensor ground
(EVAP control system pres-
sure sensor)
[Engine is running]
• Warm-up condition
• Idle speed
Approximately 0V
113
P
CAN communication line
—
—
114
L
CAN communication line
—
—
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
ECM
EC-541
< ECU DIAGNOSIS INFORMATION >
[VQ40DE FOR USA AND CANADA]
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.)
*1: Before measuring the terminal voltage, confirm that the battery is fully charged. Refer to
*2: M/T models
*3: A/T models
Fail-Safe Chart
INFOID:0000000009481219
When the DTC listed below is detected, the ECM enters the fail-safe mode and the MIL illuminates.
116
BG
Sensor ground
(APP sensor 2)
[Engine is running]
• Warm-up condition
• Idle speed
Approximately 0V
117
BG
*2
G
*3
PNP signal
[Ignition switch: ON]
• Shift lever: P or N (A/T), Neutral (M/T)
Approximately 0V
[Ignition switch: ON]
• Except above position
BATTERY VOLTAGE
(11 - 14V)
121
R
Power supply for ECM
[Ignition switch: ON]
BATTERY VOLTAGE
(11 - 14V)
122
LG
Stop lamp switch
[Ignition switch: OFF]
• Brake pedal: Fully released
Approximately 0V
[Ignition switch: OFF]
• Brake pedal: Slightly depressed
BATTERY VOLTAGE
(11 - 14V)
123
124
V
GR
ECM ground
[Engine is running]
• Idle speed
Body ground
126
Y
Brake pedal position switch
[Ignition switch: ON]
• Brake pedal: Slightly depressed
Approximately 0V
[Ignition switch: ON]
• Brake pedal: Fully released
BATTERY VOLTAGE
(11 - 14V)
127
128
B
BR
ECM ground
[Engine is running]
• Idle speed
Body ground
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
DTC No.
Detected items
Engine operating condition in fail-safe mode
P0101
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.
EC-542
< ECU DIAGNOSIS INFORMATION >
[VQ40DE FOR USA AND CANADA]
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:0000000009481220
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
P0196
P0197
P0198
Engine oil temperature
sensor
Intake valve timing control does not function.
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.
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 (A/T), Neutral position (M/T), 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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