Page 2913 of 5135
I22122
Condition
NOTE : These gauge indica-
tions occur when the refrigera-
tion system opens and the re-
frigerant is charged without
vacuuming. : Air conditioning system does not function.
I22123
Condition : Air conditioning system does not function effectively. 55±36
± HEATER & AIR CONDITIONERREFRIGERANT
AVENSIS REPAIR MANUAL (RM1018E)
(7) When there is air in the refrigeration system:
SymptomProbable causeDiagnosisCorrective Actions
Pressure is extreamly high on both
low and the high pressure sidesAir in refrigeration system
There is air in refrigeration sys-
tem
Vacuuming is insufficient(1) Check if compressor oil is dirty
or insufficient
(2) Vacuum air and supply new re-
frigerant
(8) When the refrigerant filter is defective:
SymptomProbable causeDiagnosisCorrective Actions
Pressure is extreamly high on
low pressure side
Pressure is extreamly high on
high pressure side
Trouble with refrigerant filterExcessive refrigerantReplace refrigerant filter
Page 2914 of 5135
I22124
Condition : Air conditioning system does not function.
I22123
Condition: Air conditioning system does not function effectively.
± HEATER & AIR CONDITIONERREFRIGERANT
55±37
AVENSIS REPAIR MANUAL (RM1018E)
(9) When the compressor is defective:
SymptomProbable causeDiagnosisCorrective Actions
Pressure is extreamly high on
low pressure side
Pressure is extreamly low on
high pressure side
Internal leak from compressor
Compression failure
Leakage from damaged valve or
broken sliding parts
Replace or replace compressor
(10) When the magnet valve assy is defective:
SymptomProbable causeDiagnosisCorrective Actions
Pressure is extreamly high on
low pressure sideInternal leak from magnet valve
assyMagnet valve assy failureReplace magnet valve assy
Page 2915 of 5135
550ZJ±01
I36136
I32396
E
IN
IG
± HEATER & AIR CONDITIONERHOT GAS TYPE POWER HEATER SYSTEM
55±23
AVENSIS REPAIR MANUAL (RM1018E)
INSPECTION
1. INSPECT W/RECEIVER CONDENSER ASSY
(a) Apply voltage between terminals and check that the re-
frigerant passages switch.
2. INSPECT HETER SWITCH ASSY
(a) Check that the continuity to the follwing terminals.
Standard:
Heater switch conditionConnecting terminalsStandard value
ONIG ± INContinuity
OFFIG ± INNo continuity
ONIG ± EContinuity
OFFIG ± ENo continuity
Page 2916 of 5135
550ZI±01
I35437
Connector ºBº Wire harness side:
Connector ºAº
I36091
Connector ºBº From back side:
Connector ºAº 55±22
± HEATER & AIR CONDITIONERHOT GAS TYPE POWER HEATER SYSTEM
AVENSIS REPAIR MANUAL (RM1018E)
HOT GAS TYPE POWER HEATER SYSTEM
ON±VEHICLE INSPECTION
1. INSPECT AIR CONDITIONING CONTROL ASSY
(a) Disconnect the connector from air conditioning control assy and inspect the connector on wire harness
side, as shown in the table.
Symbols (Terminal No.)Wiring ColorConditionSTD Voltage (V)
SOL+ (B17) ±
GND (B40)R ± W±BStart engine
Compressor: OperatePulse generation
MGV (B14) ±
GND (B40) (*1)R±Y ± W±BStart engine
Compressor: OperatePulse generation
HOT GAS IN (B22) ±
GND (B40) (*1)R±Y ± W±BIG SW: ON
Hot Gas SW: ONBattery positive voltage
If circuit is not as specified, try replacing the air conditioning control assy with a new one. If the circuit is not
as specified, inspect the circuits connected to the other parts.
(b) Connect the connector to air conditioning control assy and inspect wire harness side connector from
the back side, as shown in the table.
Symbols (Terminal No.)ConditionSpecified condition
HI (A4) ± GND (A1)Ignition switch ON
Turn blower dial: OFF HINo continuity Continuity
M2 (A5) ± GND (A1)Ignition switch ON
Turn blower dial: OFF M2No continuity Continuity
M1 (A6) ± GND (A1)Ignition switch ON
Turn blower dial: OFF M1No continuity Continuity
GND (A1) ± Body groundIgnition switch ON
Turn blower dial: OFF LONo continuity Continuity
Page 2917 of 5135
550ZH±01
I32392
3
4
I32393
5
6
I12755
9
12
Ohmmeter
± HEATER & AIR CONDITIONERCOMBUSTION TYPE POWER HEATER SYSTEM
55±19
AVENSIS REPAIR MANUAL (RM1018E)
INSPECTION
1. INSPECT HEATER ASSY
(a) Inspect the water temperature sensor.
(1) Using an ohmmeter, measure the resistance be-
tween the terminals 3 and 4 of heater wire.
Resistance: Refer to the graph
If the resistance is not as specified, replace the heater wire.
(b) Inspect the overheat sensor.
(1) Using an ohmmeter, measure the resistance be-
tween the terminals 5 and 6 of heater wire.
Resistance: Refer to the graph
If the resistance is not as specified, replace the heater wire.
(c) Inspect the glow plug.
(1) Using an ohmmeter, check the continuity by mea-
sure the resistance between terminals 9 and 12 of
heater wire.
Standard resistance: about 0.5 (20C, reference
value)
If the resistance is over 1 , replace the heater wire.
Page 2918 of 5135
I32394
1
2
I32395
Wire harness side: 55±20
± HEATER & AIR CONDITIONERCOMBUSTION TYPE POWER HEATER SYSTEM
AVENSIS REPAIR MANUAL (RM1018E)
(d) Inspect the flame sensor.
(1) Using an ohmmeter, measure the resistance be-
tween terminals 1 and 2 of heater wire.
Resistance: Refer to the graph
If the resistance is not as specified, replace the heater wire.
2. INSPECT HETER SWITCH ASSY
(a) Disconnect the connector from the power heater switch
and inspect the connector on the wire harness side, as
shown in the chart.
Tester connectionConditionSpecified condition
2 ± GroundConstantContinuity
4 ± GroundConstantContinuity
3 ± GroundTurn ignition switch ONBattery voltage
3 ± GroundTurn ignition switch OFFNo voltage
1 ± GroundTurn light control switch TAIL or HEADBattery voltage
1 ± GroundTurn light control switch OFFNo voltage
If the circuit is as specified, replace the power heat-
er switch.
If the circuit is not as specified, inspect the circuits
connected to other parts.
Page 2919 of 5135
I32396
From back side:
± HEATER & AIR CONDITIONERCOMBUSTION TYPE POWER HEATER SYSTEM
55±21
AVENSIS REPAIR MANUAL (RM1018E)
(b) Connect the connector to the power heater switch and in-
spect the connector from the back side, as shown in the
chart.
Tester connectionConditionSpecified condition
6 ± GroundTurn the ignition switch ON and power heater
switch ONBattery voltage
6 ± GroundTurn the ignition switch ON and power heater
switch OFFNo voltage
If the circuit is not as specified, replace the power
heater switch.
Page 2920 of 5135
550ZG±01
I12508
Connector B
DTC Check Harness
Current DisplayControl PanelPast Record DTC Display
Memory Clear Button
DTC Calling Button
DTC Calling ButtonºHeatingº
Symbol In Normal
In Malfunction Connector A
± HEATER & AIR CONDITIONERCOMBUSTION TYPE POWER HEATER SYSTEM
55±15
AVENSIS REPAIR MANUAL (RM1018E)
COMBUSTION TYPE POWER HEATER SYSTEM
ON±VEHICLE INSPECTION
NOTICE:
If the glow plug breaks, the ECU detects the breakage and stops the automatic operation, so
the burner heater does not activate. (For other failures, similarly activated.)
The cause of failures (such as voltage malfunction, overheating malfunction, short±circuit or
breakage of functional components, etc.) and repair methods are shown by connecting the DTC
tester and reading the DTC.
1. DIAGNOSTICS FUNCTION
(a) Connect the DTC tester between the connector A (Vehicle harness) of DTC check harness and con-
nector B (Power heater harness).
(b) Start the engine.
(c) Pressing the DTC calling button displays a 3±digit number DTC.