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Nissan Frontier. Manual - part 377

ECM

EC-79

< ECU DIAGNOSIS INFORMATION >

[QR25DE]

R/B

Power supply for ECM
(Back-up)

[Ignition switch: OFF]

BATTERY VOLTAGE
(11 - 14 V)

Intake valve timing control
solenoid valve

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

BATTERY VOLTAGE
(11 - 14 V)

[Engine is running]
• Warm-up condition
• Engine speed: 2,500 rpm

7 - 10 V

Accelerator pedal position
sensor 1

[Ignition switch: ON]
• Engine: Stopped
• Accelerator pedal: Fully released

0.6 - 0.95 V

[Ignition switch: ON]
• Engine: Stopped
• Accelerator pedal: Fully depressed

Less than 4.75 V

Accelerator pedal position
sensor 2

[Ignition switch: ON]
• Engine: Stopped
• Accelerator pedal: Fully released

0.3 - 0.45 V

[Ignition switch: ON]
• Engine: Stopped
• Accelerator pedal: Fully depressed

Less than 2.4 V

Sensor power supply
(Accelerator pedal position
sensor 1)

[Ignition switch: ON]

Approximately 5 V

Sensor ground
(Accelerator pedal position
sensor 1)

—

ASCD steering switch

[Ignition switch: ON]
• ASCD steering switch: OFF

Approximately 4 V

[Ignition switch: ON]
• MAIN switch: Pressed

Approximately 0 V

[Ignition switch: ON]
• CANCEL switch: Pressed

Approximately 1 V

[Ignition switch: ON]
• RESUME/ACCELERATE switch: Pressed

Approximately 3 V

[Ignition switch: ON]
• SET/COAST switch: Pressed

Approximately 2 V

EVAP control system pres-
sure sensor

[Ignition switch: ON]

Approximately 1.8 - 4.8 V

Sensor power supply
(Accelerator pedal position
sensor 2)

[Ignition switch: ON]

Approximately 5 V

Data link connector

—

Sensor power supply
(EVAP control system pres-
sure sensor)

[Ignition switch: ON]

Approximately 5 V

Sensor ground
(ASCD steering switch)

—

TERMI-

NAL

NO.

WIRE

COLOR

ITEM

CONDITION

DATA (DC Voltage)

PBIB1790E

EC-80

< ECU DIAGNOSIS INFORMATION >

[QR25DE]

ECM

: 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

PG-4, "How to

Handle Battery"

*2: M/T models

*3: A/T models

Fail-safe Chart

INFOID:0000000009480749

When the DTC listed below is detected, the ECM enters fail-safe mode and the MIL lights up.

W/R

Ignition switch

[Ignition switch: OFF]

0 V

[Ignition switch: ON]

BATTERY VOLTAGE
(11 - 14 V)

Fuel tank temperature sen-
sor

[Engine is running]

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

Sensor ground
(EVAP control system pres-
sure sensor)

—

CAN communication line

—

CAN communication line

—

100

Sensor ground
(Accelerator pedal position
sensor 2)

—

101

PNP signal

[Ignition switch: ON]
• Shift lever: P or N (A/T), Neutral (M/T)

Approximately 0 V

[Ignition switch: ON]
• Shift lever: Except above

BATTERY VOLTAGE
(11 - 14 V)

105

Power supply for ECM

[Ignition switch: ON]

BATTERY VOLTAGE
(11 - 14 V)

106

Stop lamp switch

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

Approximately 0 V

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

BATTERY VOLTAGE
(11 - 14 V)

107

ECM ground

—

108

ECM ground

—

109

EVAP canister vent control
valve

[Ignition switch: ON]

BATTERY VOLTAGE
(11 - 14 V)

110

Brake pedal position switch

[Ignition switch: ON]
• Brake pedal: Slightly depressed (A/T)
• Clutch pedal and/or clutch pedal:

Slightly depressed (M/T)

Approximately 0 V

[Ignition switch: ON]
• Brake pedal: Fully released (A/T)
• Clutch pedal and brake pedal:

Fully released (M/T)

BATTERY VOLTAGE
(11 - 14 V)

111

ECM ground

—

112

ECM ground

—

TERMI-

NAL

NO.

WIRE

COLOR

ITEM

CONDITION

DATA (DC Voltage)

ECM

EC-81

< ECU DIAGNOSIS INFORMATION >

[QR25DE]

• When there is an open circuit on MIL circuit, the ECM cannot warn the driver by illuminating 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 the 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 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 temperature
sensor circuit

Engine coolant temperature will be determined by ECM based on the following condi-
tion.
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 or more 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 cool-
ing 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 func-
tion

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 actu-
ator

(When electric throttle control actuator does not function properly due to the return
spring malfunction:)
ECM controls the electric throttle actuator by 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 because of fuel cut. After the
vehicle stops, the engine stalls.
The engine can restart in P or N (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

Engine operating condition in fail-safe mode

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

EC-82

< ECU DIAGNOSIS INFORMATION >

[QR25DE]

ECM

DTC Inspection Priority Chart

INFOID:0000000009480750

If some DTCs are displayed at the same time, perform inspections one by one based on the following priority

chart.

DTC Index

INFOID:0000000009480751

EMISSION-RELATED DIAGNOSTIC INFORMATION ITEMS

Priority

Detected items (DTC)

• U0100 U0101 U1001 CAN communication line
• P0101 P0102 P0103 Mass air flow sensor
• P0111 P0112 P0113 P0127 Intake air temperature sensor
• P0116 P0117 P0118 P0125 Engine coolant temperature sensor
• P0122 P0123 P0222 P0223 P1225 P1226 P2135 Throttle position sensor
• P0128 Thermostat function
• P0181 P0182 P0183 Fuel tank temperature sensor
• P0327 P0328 Knock sensor
• P0335 Crankshaft position sensor (POS)
• P0340 Camshaft position sensor (PHASE)
• P0460 P0461 P0462 P0463 Fuel level sensor
• P0500 Vehicle speed sensor
• P0605 P0607 ECM
• P0643 Sensor power supply
• P0700 TCM
• P0705 Transmission range switch
• P0850 Park/neutral position (PNP) switch
• P1610 - P1615 NATS
• P1550 P1551 P1552 P1553 P1554 Battery current sensor
• P2122 P2123 P2127 P2128 P2138 Accelerator pedal position sensor

• P0031 P0032 A/F sensor 1 heater
• P0037 P0038 Heated oxygen sensor 2 heater
• P0075 Intake valve timing control solenoid valve
• P0130 P0131 P0132 P014C P014D P015A P015B P2096 P2097 A/F sensor 1
• P0137 P0138 P0139 Heated oxygen sensor 2
• P0441 EVAP control system purge flow monitoring
• P0443 P0444 P0445 EVAP canister purge volume control solenoid valve
• P0447 P0448 EVAP canister vent control valve
• P0451 P0452 P0453 EVAP control system pressure sensor
• P0506 P0507 Idle speed control system
• P0550 Power steering pressure sensor
• P0603 ECM power supply
• P0710 P0717 P0720 P0731 P0732 P0733 P0734 P0735 P0740 P0744 P0745 P1730 P1752 P1754 P1757 P1759

P1762 P1764 P1767 P1769 P1772 P1774 A/T related sensors and solenoid valves

• P1805 Brake switch
• P2101 Electric throttle control function
• P2100 P2103 P2118 Electric throttle control actuator

• P0011 Intake valve timing control
• P0171 P0172 Fuel injection system function
• P0300 - P0304 Misfire
• P0420 Three way catalyst function
• P0442 P0456 EVAP control system (SMALL LEAK, VERY SMALL LEAK)
• P0455 EVAP control system (GROSS LEAK)
• P1148 Closed loop control
• P117A Air fuel ratio
• P1212 TCS communication line
• P1217 Engine over temperature (OVERHEAT)
• P050A P050E Cold start control
• P1564 ASCD steering switch
• P1572 ASCD brake switch
• P1574 ASCD vehicle speed sensor
• P1715 Input speed sensor
• P2119 Electric throttle control actuator

Content .. 375 376 377 378 ..