Infiniti M35/M45 Y50. Manual — part 136

TROUBLE DIAGNOSIS

ATC-95

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ATC

1.

CHECK AMBIENT SENSOR AND INTAKE SENSOR CIRCUIT

Check ambient sensor and intake sensor. Refer to

ATC-57, "FUNCTION CONFIRMATION PROCEDURE"

,

see No. 9 and 11.

OK or NG

OK

>> GO TO 2.

NG

>>

●

Malfunctioning ambient sensor: Refer to

ATC-112, "Ambient Sensor Circuit"

.

●

Malfunctioning intake sensor: Refer to

ATC-121, "Intake Sensor Circuit"

.

2.

PERFORM AUTO ACTIVE TEST

Refer to

PG-23, "Auto Active Test"

.

Does the magnet clutch operate?

YES

>>

●

WITH CONSULT-II: GO TO 5.

●

WITHOUT CONSULT-II: GO TO 6.

NO

>> Check 10A fuse (No. 79, located in IPDM E/R). Refer to

PG-28, "IPDM E/R Terminal Arrange-

ment"

, and GO TO 3.

3.

CHECK CIRCUIT CONTINUITY BETWEEN IPDM E/R AND COMPRESSOR

1.

Turn ignition switch OFF.

2.

Disconnect IPDM E/R connector and compressor connector.

3.

Check continuity between IPDM E/R harness connector E8 ter-
minal 34 and compressor harness connector F24 terminal 1.

OK or NG

OK

>> GO TO 4.

NG

>> Repair harness or connector.

4.

CHECK MAGNET CLUTCH CIRCUIT

Check for operation sound when applying battery voltage direct cur-
rent to terminal.

OK or NG

OK

>> 1. Replace IPDM E/R.

2. Go to self-diagnosis procedure

ATC-57, "FUNCTION

CONFIRMATION PROCEDURE"

and perform self-

diagnosis STEP-4. Confirm that magnet clutch opera-
tion normal.

NG

>> 1. Replace compressor.

2. Go to self-diagnosis procedure

ATC-57, "FUNCTION

CONFIRMATION PROCEDURE"

and perform self-

diagnosis STEP-4. Confirm that magnet clutch operation normal.

34 – 1

: Continuity should exist.

RJIA4079E

RJIA2005E

ATC-96

TROUBLE DIAGNOSIS

5.

CHECK BCM INPUT (COMPRESSOR ON) SIGNAL

Check compressor ON/OFF signal. Refer to

ATC-40, "CONSULT-II

Function (ECM)"

.

OK or NG

OK

>> GO TO 8.

NG

>> GO TO 6.

6.

CHECK REFRIGERANT PRESSURE SENSOR

WITH CONSULT-II

1.

Start the engine.

2.

Check voltage of refrigerant pressure sensor. Refer to

EC-138, "CONSULT-II Reference Value in Data

Monitor"

(VQ35DE) or

EC-841, "CONSULT-II Reference Value in Data Monitor"

(VK45DE).

WITHOUT CONSULT-II

1.

Start the engine.

2.

Check voltage between ECM harness connector F108 terminal
70 and ground.

OK or NG

OK

>>

●

WITH CONSULT-II: GO TO 7.

●

WITHOUT CONSULT-II: Repair harness or connector.

NG

>> Refer to

EC-704, "REFRIGERANT PRESSURE SENSOR"

(VQ35DE) or

EC-1424, "REFRIGER-

ANT PRESSURE SENSOR"

(VK45DE).

7.

CHECK ECM INPUT (FAN ON) SIGNAL

Check FAN ON/OFF signal. Refer to

ATC-40, "CONSULT-II Function

(ECM)"

.

OK or NG

OK

>> GO TO 8.

NG

>> Repair harness or connector.

A/C SW ON

: AIR COND SIG ON

A/C SW OFF

: AIR COND SIG OFF

RJIA3646E

Terminals

Condition

Voltage

(+)

(

−

)

ECM

connector

Terminal

No.

F108

70

Ground

A/C switch: ON
(Blower motor operates.)

Approx. 1.0 -

4.0 V

PBIB1188E

FAN SW ON

: HEATER FAN SW ON

FAN SW OFF

: HEATER FAN SW OFF

RJIA3646E

TROUBLE DIAGNOSIS

ATC-97

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ATC

8.

CHECK CAN COMMUNICATION

Check CAN communication. Refer to

EC-161, "DTC U1000, U1001 CAN COMMUNICATION LINE"

(VQ35DE) or

EC-865, "DTC U1000, U1001 CAN COMMUNICATION LINE"

(VK45DE).

●

ECM – IPDM E/R

●

ECM – Unified meter and A/C amp.

OK or NG

OK

>> Replace ECM.

NG

>> Repair or replace malfunctioning part(s).

COMPONENT INSPECTION
Refrigerant Pressure Sensor

The refrigerant pressure sensor is attached to the liquid tank.
Make sure that the A/C refrigerant pressure and the sensor output
voltage are within the specified range as shown in the A/C operating
condition figure. Refer to

EC-704, "REFRIGERANT PRESSURE

SENSOR"

(VQ35DE) or

EC-1424, "REFRIGERANT PRESSURE

SENSOR"

(VK45DE).

RJIA4080E

RJIA2954E

ATC-98

TROUBLE DIAGNOSIS

Insufficient Cooling

NJS000GV

SYMPTOM: Insufficient cooling

INSPECTION FLOW

SJIA1777E