Nissan Pathfinder. Manual — part 445

EC-86

< ECU DIAGNOSIS INFORMATION >

[VQ35DE]

ECM

96

(P)

64

(V)

Sensor power supply
(Refrigerant pressure sensor)

—

[Ignition switch: ON]

5 V

97

(W)

100

(R)

Accelerator pedal position
sensor 1

Input

[Ignition switch: ON]
• Engine stopped
• Accelerator pedal: Fully re-

leased

0.5 - 1.0 V

[Ignition switch: ON]
• Engine stopped
• Accelerator pedal: Fully de-

pressed

4.2 - 4.8 V

98

(P)

116

(G)

Accelerator pedal position
sensor 2

Input

[Ignition switch: ON]
• Engine stopped
• Accelerator pedal: Fully re-

leased

0.25 - 0.50 V

[Ignition switch: ON]
• Engine stopped
• Accelerator pedal: Fully de-

pressed

2.0 - 2.5 V

99

(R)

100

(R)

Sensor power supply
(Accelerator pedal position
sensor 1)

—

[Ignition switch: ON]

5 V

100

(R)

—

Sensor ground
(Accelerator pedal position
sensor 1)

—

—

—

101

(G)

108

(R)

ASCD steering switch

Input

[Ignition switch: ON]
ASCD steering switch: OFF

4 V

[Ignition switch: ON]
MAIN switch: Pressed

0 V

[Ignition switch: ON]
CANCEL switch: Pressed

1 V

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

3 V

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

2 V

102

(O)

112

(G)

EVAP control system pres-
sure sensor

Input

[Ignition switch: ON]

1.8 - 4.8 V

103
(W)

116

(G)

Sensor power supply
(Accelerator pedal position
sensor 2)

—

[Ignition switch: ON]

5 V

104

(P)

—

Data link connector

Input/

Output

—

—

106

(Y)

128

(B)

EVAP canister vent control
valve

Output

[Ignition switch: ON]

BATTERY VOLTAGE
(11 - 14 V)

107
(W)

112

(G)

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

—

[Ignition switch: ON]

5 V

108

(R)

—

Sensor ground
(ASCD steering switch)

—

—

—

109

(SB)

128

(B)

Ignition switch

Input

[Ignition switch: OFF]

0 V

[Ignition switch: ON]

BATTERY VOLTAGE
(11 - 14 V)

Terminal No.

Description

Condition

Value

(Approx.)

+

-–

Signal name

Input/

Output

ECM

EC-87

< ECU DIAGNOSIS INFORMATION >

[VQ35DE]

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: This may vary depending on internal resistance of the tester.

*2: Before measuring the terminal voltage, confirm that the battery is fully charged. Refer to

PG-86, "How to

Handle Battery"

.

Fail-safe

INFOID:0000000009178065

NON DTC RELATED ITEM

111

(BR)

120

(LG)

Fuel tank temperature sensor

Input

[Engine is running]

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

112

(G)

—

Sensor ground
(EVAP control system pres-
sure sensor, engine oil pres-
sure sensor)

—

—

—

113

(P)

—

CAN communication line
(CAN-L)

Input/

Output

—

—

114

(L)

—

CAN communication line
(CAN-H)

Input/

Output

—

—

116

(G)

—

Sensor ground
(Accelerator pedal position
sensor 2)

—

—

—

118
(W)

128

(B)

PNP signal

Input

[Ignition switch: ON]
Selector lever: P or N position

BATTERY VOLTAGE
(11 - 14 V)

[Ignition switch: ON]
Selector lever: Except above
position

0 V

120

(LG)

—

Sensor ground
(Fuel tank temperature sen-
sor)

—

—

—

121

(LG)

128

(B)

Power supply for ECM

Input

[Ignition switch: ON]

BATTERY VOLTAGE
(11 - 14 V)

122

(R)

128

(B)

Stop lamp switch

Input

[Ignition switch: OFF]
Brake pedal: Fully released

0 V

[Ignition switch: OFF]
Brake pedal: Slightly depressed

BATTERY VOLTAGE
(11 - 14 V)

123

(B)

124

(B)

—

ECM ground

—

—

—

126

(LG)

128

(B)

Brake pedal position switch

Input

[Ignition switch: ON]
Brake pedal: Slightly depressed

0 V

[Ignition switch: ON]
Brake pedal: Fully released

BATTERY VOLTAGE
(11 - 14 V)

127

(B)

128

(B)

—

ECM ground

—

—

—

Terminal No.

Description

Condition

Value

(Approx.)

+

-–

Signal name

Input/

Output

EC-88

< ECU DIAGNOSIS INFORMATION >

[VQ35DE]

ECM

DTC RELATED ITEM

Engine operating condi-

tion in fail-safe mode

Detected items

Remarks

Reference

page

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

Malfunction indicator
lamp circuit

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.

EC-443

DTC No.

Detected items

Engine operating condition in fail-safe mode

P0011

P0021

Intake valve timing control

The signal is not energized to the intake valve timing control solenoid valve and the valve
control does not function.

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 or more after en-
gine 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.

P0196
P0197
P0198

Engine oil temperature
sensor

Intake valve timing control does not function.

P0500

Vehicle speed sensor

The cooling fan operates (Highest) while engine is running.

P0524

Engine oil pressure

• ECM illuminates oil pressure warning lamp on the combination meter.
• Engine speed will not rise more than 4,000 rpm due to the fuel cut.
• Fail-safe is canceled when ignition switch OFF

→ ON.

P0605

ECM

(When ECM calculation function is malfunctioning:)
ECM stops the electric throttle control actuator control, throttle valve is maintained at a
fixed opening (approx. 5 degrees) by the return spring.
ECM deactivates ASCD operation.

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.

P1805

Brake switch

ECM controls the electric throttle control actuator by regulating the throttle opening to a
small range.
Therefore, acceleration will be poor.

Vehicle condition

Driving condition

When engine is idling

Normal

When accelerating

Poor acceleration

ECM

EC-89

< ECU DIAGNOSIS INFORMATION >

[VQ35DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

DTC Inspection Priority Chart

INFOID:0000000009178066

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

chart.

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 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 the 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