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Nissan Frontier. Manual - part 614

ECM

EC-1027

< ECU DIAGNOSIS INFORMATION >

[VQ40DE FOR MEXICO]

Engine coolant temperature
sensor

[Engine is running]

Approximately 0 - 4.8V
Output voltage varies with engine
coolant temperature.

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

B/R

A/F sensor 1 (Bank 2)

[Ignition switch: ON]

Approximately 1.8V

Sensor ground
(Heated oxygen sensor 2)

[Engine is running]
• Warm-up condition
• Idle speed

Approximately 0V

79
80
81

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

Sensor ground
(APP sensor 1)

[Engine is running]
• Warm-up condition
• Idle speed

Approximately 0V

Sensor ground
(APP sensor 2)

[Engine is running]
• Warm-up condition
• Idle speed

Approximately 0V

Data link connector

[Ignition switch: ON]
• CONSULT or GST: disconnected

Approximately 5V - Battery volt-
age (11 - 14V)

CAN communication line

—

Sensor power supply
(APP sensor 1)

[Ignition switch: ON]

Approximately 5V

Sensor power supply
(APP sensor 2)

[Ignition switch: ON]

Approximately 5V

CAN communication line

—

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

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

Stop lamp switch

[Ignition switch: OFF]
• Brake pedal: Fully released

Approximately 0V

[Ignition switch: OFF]
• Brake pedal: Slightly depressed

BATTERY VOLTAGE
(11 - 14V)

102

PNP signal

[Ignition switch: ON]
• Shift lever: P or N

Approximately 0V

[Ignition switch: ON]
• Except above position

BATTERY VOLTAGE
(11 - 14V)

104

Throttle control motor relay

[Ignition switch: OFF]

BATTERY VOLTAGE
(11 - 14V)

[Ignition switch: ON]

0 - 1.0V

106

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

Fuel tank temperature sensor [Engine is running]

Approximately 0 - 4.8V
Output voltage varies with fuel
tank temperature.

108

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]

[Ignition switch: ON]

BATTERY VOLTAGE
(11 - 14V)

111

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

Fuel pump relay

[Ignition switch: ON]
• For 1 second after turning ignition switch

[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]

: 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

PG-4, "How to Handle Battery"

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

ECM ground

[Engine is running]
• Idle speed

Body ground

117

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

°C (104°F)

Approx. 4 minutes after engine
starting

°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

EC-1253, "DTC Logic"

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

DTC No.

Detected items

Engine operating condition in fail-safe mode

Engine speed will not rise more than 2,500 rpm due to the fuel cut

Content .. 612 613 614 615 ..