Infiniti QX56 (Z62). Manual — part 528

EC-90

< ECU DIAGNOSIS INFORMATION >

[VK56VD]

ECM

111

(R)

175

(B)

Fuel injector driver power supply

Input

[Ignition switch: ON]

BATTERY VOLTAGE
(11 - 14 V)

112

(SB)

175

(B)

Fuel injector driver power supply

Input

[Ignition switch: ON]

BATTERY VOLTAGE
(11 - 14 V)

114

(B)

—

ECM ground

—

—

—

115

(B)

—

ECM ground

—

—

—

120

(Y)

175

(B)

EVAP canister vent control valve

Output

[Ignition switch: ON]

BATTERY VOLTAGE
(11 - 14 V)

122

(BR/

W)

175

(B)

VVEL actuator motor relay abort
signal (VVEL control module)

Input

[Ignition switch: ON]

0 V

123

(V/R)

175

(B)

Throttle control motor relay

Output

[Ignition switch: ON

→

OFF]

0 - 1.0 V

↓

BATTERY VOLTAGE
(11 - 14 V)

↓

0 V

[Ignition switch: ON]

0 - 1.0 V

125

(GR)

175

(B)

Fuel pump control module
(FPCM)

Output

[When cranking engine]

0 - 0.5 V

[Engine is running]
• Warm-up condition

0 - 4.0 V

126

(O)

129

(P/L)

Accelerator pedal position sen-
sor 2

Input

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

0.28 - 0.48 V

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

2.0 - 2.5 V

128

(Y)

130

(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

Terminal No.

(Wire color)

Description

Condition

Value

(Approx.)

+

–

Signal name

Input/

Output

JPBIA3344ZZ

ECM

EC-91

< ECU DIAGNOSIS INFORMATION >

[VK56VD]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

128

(Y)

175

(B)

ICC steering switch

Input

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

4.2 V

[Ignition switch: ON]
• MAIN switch: Pressed

0 V

[Ignition switch: ON]
• CANCEL switch: Pressed

1.9 V

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

Pressed

3.7 V

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

3.2 V

[Ignition switch: ON]
• DISTANCE switch: Pressed

2.6 V

[Ignition switch: ON]
• DYNAMIC DRIVER ASSISTANCE

switch: Pressed

1.0 V

129

(P/L)

—

Sensor ground
(Accelerator pedal position sen-
sor 2)

—

—

—

130

(R)

—

Sensor ground
(ASCD steering switch/ICC
steering switch)

—

—

—

131

(L/W)

129

(P/L)

Sensor power supply
(Accelerator pedal position sen-
sor 2)

—

[Ignition switch: ON]

5 V

133

(SB)

150

(R)

Sensor power supply
(Refrigerant pressure sensor/
Battery current sensor/EVAP
control system pressure sensor)

—

[Ignition switch: ON]

5 V

134

(V/W)

175

(B)

Fuel temperature sensor

Input

[Engine is running]
• Warm-up condition

2.8 V

136

(W/

R)

140

(R/Y)

Accelerator pedal position sen-
sor 1

Input

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

0.65 - 0.87 V

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

4.3 - 4.8 V

137

(W/

G)

140

(R/Y)

Sensor power supply
(Accelerator pedal position sen-
sor 1)

—

[Ignition switch: ON]

5 V

138

(V)

150

(R)

Battery current sensor

Input

[Engine is running]

• Battery: Fully charged*

2

• Idle speed

2.6 - 3.5 V

139

(G)

175

(B)

Battery temperature sensor

Input

[Engine is running]
• Battery temperature: 25

°

C

• Idle speed

3.3 V

140

(R/Y)

—

Sensor ground
(Accelerator pedal position sen-
sor 1)

—

—

—

141

(SB)

175

(B)

Ignition switch

Input

[Ignition switch: OFF]

0 V

[Ignition switch: ON]

BATTERY VOLTAGE
(11 - 14 V)

Terminal No.

(Wire color)

Description

Condition

Value

(Approx.)

+

–

Signal name

Input/

Output

EC-92

< ECU DIAGNOSIS INFORMATION >

[VK56VD]

ECM

142

(R/
W)

175

(B)

Fuel pump control module
(FPCM) check

Input

[When cranking engine]

0 V

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

9 V

143

(L/Y)

150

(R)

EVAP control system pressure
sensor

Input

[Ignition switch: ON]

1.8 - 4.8 V

144

(O/B)

150

(R)

Refrigerant pressure sensor

Input

[Engine is running]
• Warm-up condition
• Both A/C switch and blower fan mo-

tor switch: ON (Compressor oper-
ates)

1.0 - 4.0 V

146

(L)

—

CAN communication line

—

—

—

147

(G/Y)

175

(B)

ASCD/ICC brake switch

Input

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

0 V

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

BATTERY VOLTAGE
(11 - 14 V)

150

(R)

—

Sensor ground
(Refrigerant pressure sensor/
Battery current sensor/EVAP
control system pressure sensor)

—

—

—

151

(P)

—

CAN communication line

—

—

—

156

(L)

175

(B)

Power supply for ECM (Back-
up)

Input

[Ignition switch: OFF]

BATTERY VOLTAGE
(11 - 14 V)

158

(W/B)

175

(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)

161

(R/
W)

—

ENG communication line

—

—

—

163

(L/G)

175

(B)

ECM relay (Self shut-off)

Output

[Engine is running]
[Ignition switch: OFF]
• A few seconds after turning ignition

switch OFF

0 - 1.5 V

[Ignition switch: OFF]
• More than a few seconds after turn-

ing ignition switch OFF

BATTERY VOLTAGE
(11 - 14 V)

165

(GR/

R)

—

NOTE:
Not used

—

—

—

166
(W)

—

ENG communication line

—

—

—

Terminal No.

(Wire color)

Description

Condition

Value

(Approx.)

+

–

Signal name

Input/

Output

ECM

EC-93

< ECU DIAGNOSIS INFORMATION >

[VK56VD]

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-159, "How to Handle Battery"

.

Fail-safe

INFOID:0000000006217731

NON DTC RELATED ITEM

DTC RELATED ITEM

169

(G/B)

175

(B)

Engine speed signal output

Input

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

NOTE:
The pulse cycle changes depending
on rpm at idle

0 - 7.0 V

[Engine is running]
• Warm-up condition
• Engine speed: 2,000 rpm

0 - 7.0 V

171
(W)

175

(B)

Power supply for ECM

Input

[Ignition switch: ON]

BATTERY VOLTAGE
(11 - 14 V)

172
(W)

175

(B)

Power supply for ECM

Input

[Ignition switch: ON]

BATTERY VOLTAGE
(11 - 14 V)

173

(O)

175

(B)

Throttle control motor power
supply

Input

[Ignition switch: ON]

BATTERY VOLTAGE
(11 - 14 V)

174

(B)

—

ECM ground

—

—

—

175

(B)

—

ECM ground

—

—

—

Terminal No.

(Wire color)

Description

Condition

Value

(Approx.)

+

–

Signal name

Input/

Output

JPBIA3352ZZ

JPBIA3354ZZ

Detected items

Engine operating condition

in fail-safe mode

Remarks

Reference

page

Malfunction indicator
circuit

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

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 malfunc-
tion.

EC-515