Infiniti Q45. Manual - part 526

IGNITION SIGNAL

EC-743

C

D

E

F

G

H

I

J

K

L

M

A

EC

CAUTION:

●

Do not approach to the spark plug and the ignition coil within 50cm. Be careful not to get an
electrical shock while checking, because the electrical discharge voltage becomes 20kV or
more.

●

It might cause to damage the ignition coil if the gap of more than 17 mm is taken.

NOTE:
When the gap is less than 13 mm, the spark might be generated even if the coil is malfunctioning.

17. If NG, replace ignition coil with power transistor.

CONDENSER

1.

Turn ignition switch OFF.

2.

Disconnect condenser harness connector.

3.

Check resistance between condenser terminals 1 and 2.

Removal and Installation

NBS00273

IGNITION COIL WITH POWER TRANSISTOR

Refer to 

EM-29, "IGNITION COIL"

 .

Resistance: Above 1 M

Ω

 [at 25

°

C (77

°

F)]

PBIB0794E

EC-744

REFRIGERANT PRESSURE SENSOR

REFRIGERANT PRESSURE SENSOR

PFP:92136

Component Description

NBS0027G

The refrigerant pressure sensor is installed at the condenser of the
air conditioner system. The sensor uses an electrostatic volume
pressure transducer to convert refrigerant pressure to voltage. The
voltage signal is sent to ECM, and ECM controls cooling fan system.

PBIB0037E

PBIB2657E

REFRIGERANT PRESSURE SENSOR

EC-745

C

D

E

F

G

H

I

J

K

L

M

A

EC

Wiring Diagram

NBS0027H

TBWM0586E

EC-746

REFRIGERANT PRESSURE SENSOR

Specification data are reference values and are measured between each terminal and ground.

CAUTION:

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

Diagnostic Procedure

NBS0027I

1. 

CHECK REFRIGERANT PRESSURE SENSOR OVERALL FUNCTION

1.

Start engine and warm it up to normal operating temperature.

2.

Turn A/C switch and blower switch ON.

3.

Check voltage between ECM terminal 70 and ground with CON-
SULT-II or tester.

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 2.

TER-

MINAL 

NO.

WIRE 

COLOR

ITEM

CONDITION

DATA (DC Voltage)

49

L

Sensor power supply
(Refrigerant pressure sen-
sor)

[Ignition switch: ON]

Approximately 5V

67

B

Sensor ground
(MAF sensor, IAT sensor, 
ECT sensor, FTT sensor, 
EVAP control system pres-
sure sensor, PSP sensor, 
ICC steering switch, ASCD 
steering switch, Refrigerant 
pressure sensor)

[Engine is running]

●

Warm-up condition

●

Idle speed

Approximately 0V

70

P

Refrigerant pressure sensor

[Engine is running]

●

Warm-up condition

●

Both A/C switch and blower fan motor 
switch: ON (Compressor operates)

1.0 - 4.0V

Voltage: 1.0 - 4.0V

PBIB1188E