2006 INFINITI M35 Factory Service Manual

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Page 545 of 5621

INFINITI M35 2006 Factory Service Manual ATC-98
TROUBLE DIAGNOSIS
Revision: 2006 January2006 M35/M45
8. CHECK CAN COMMUNICATION
Check CAN communication. Refer to EC-173, "
DTC U1000, U1001 CAN COMMUNICATION LINE"
(VQ35DE) o

Page 546 of 5621

INFINITI M35 2006 Factory Service Manual TROUBLE DIAGNOSIS
ATC-99
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MA
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AT C
Revision: 2006 January2006 M35/M45
Insufficient CoolingNJS000GV
SYMPTOM: Insufficient cooling
INSPECTION FLOW
RJIA4081E

Page 547 of 5621

INFINITI M35 2006 Factory Service Manual ATC-100
TROUBLE DIAGNOSIS
Revision: 2006 January2006 M35/M45
*1ATC-56, "FUNCTION CONFIRMA-
TION PROCEDURE", see No. 2 to 6.*2ATC-83, "
Air Mix Door Motor Circuit"*3ATC-103, "Test R

Page 548 of 5621

INFINITI M35 2006 Factory Service Manual TROUBLE DIAGNOSIS
ATC-101
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AT C
Revision: 2006 January2006 M35/M45
PERFORMANCE TEST DIAGNOSIS
*1ATC-103, "PERFORMANCE
CHART"
*2ATC-103, "PERFORMANCE
CHART"
*3AT

Page 549 of 5621

INFINITI M35 2006 Factory Service Manual ATC-102
TROUBLE DIAGNOSIS
Revision: 2006 January2006 M35/M45
*1ATC-157, "Check Disc to Pulley
Clearance"
*2ATC-89, "Blower Motor Circuit"*3EM-15, "Checking Drive Belts"
(VQ35

Page 550 of 5621

INFINITI M35 2006 Factory Service Manual TROUBLE DIAGNOSIS
ATC-103
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AT C
Revision: 2006 January2006 M35/M45
PERFORMANCE CHART
Test Condition
Testing must be performed as follows:
Test Reading (VQ35DE)
Recirculating-to-d

Page 551 of 5621

INFINITI M35 2006 Factory Service Manual ATC-104
TROUBLE DIAGNOSIS
Revision: 2006 January2006 M35/M45
Test Reading (VK45DE)
Recirculating-to-discharge Air Temperature Table
Ambient Air Temperature-to-operating Pressure Table
Inside air (Reci

Page 552 of 5621

INFINITI M35 2006 Factory Service Manual TROUBLE DIAGNOSIS
ATC-105
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AT C
Revision: 2006 January2006 M35/M45
TROUBLE DIAGNOSIS FOR UNUSUAL PRESSURE
Whenever system’s high and/or low side pressure(s) is/are unus

TROUBLE DIAGNOSIS
ATC-105
C
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AT C
Revision: 2006 January2006 M35/M45
TROUBLE DIAGNOSIS FOR UNUSUAL PRESSURE
Whenever system’s high and/or low side pressure(s) is/are unusual, diagnose using a manifold gauge. The
marker above the gauge scale in the following tables indicates the standard (usual) pressure range. Since the
standard (usual) pressure, however, differs from vehicle to vehicle, refer to above table (Ambient air tempera-
ture-to-operating pressure table).
Both High- and Low-pressure Sides are Too High
High-pressure Side is Too High and Low-pressure Side is Too Low
Gauge indication Refrigerant cycle Probable cause Corrective action
Both high- and low-pressure sides
are too high.The pressure returns to nor-
mal soon after water is
splashed on condenser.Excessive refrigerant charge
in refrigeration cycle.Reduce refrigerant until speci-
fied pressure is obtained.
Air suction by cooling fan is
insufficient.Insufficient condenser cooling
performance.
1. Condenser fins are clogged.
2. Improper fan rotation of
cooling fan.
Clean condenser.
Check and repair cooling fan
as necessary.
Low-pressure pipe is not
cold.
When compressor is
stopped high-pressure
value quickly drops by
approximately 196 kPa (2
kg/cm
2 , 28 psi). It then
decreases gradually there-
after.Poor heat exchange in con-
denser
(After compressor operation
stops, high-pressure
decreases too slowly.).Air in refrigeration cycle.Evacuate repeatedly and
recharge system.
Engine tends to overheat.Engine cooling systems mal-
function.Check and repair each engine
cooling system.
An area of the low-pres-
sure pipe is colder than
areas near the evaporator
outlet.
Low-pressure pipe is
sometimes covered with
frost.
Excessive liquid refrigerant
on low-pressure side.
Excessive refrigerant dis-
charge flow.
Expansion valve is open a
little compared with the
specification.

Improper expansion valve
adjustment.Replace expansion valve.
AC359A
Gauge indication Refrigerant cycle Probable cause Corrective action
High-pressure side is too high and
low-pressure side is too low.
Upper side of condenser and
high-pressure side are hot,
however, liquid tank is not so
hot.High-pressure tube or parts
located between compressor
and condenser are clogged or
crushed.
Check and repair or replace
malfunctioning parts.
Check lubricant for contami-
nation.
AC360A

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