TOYOTA AVENSIS 2005 Service Repair Manual



E50650
I30156
Resistance (k
)
Temperature (
C)
±
DIAGNOSTICS AIR CONDITIONING SYSTEM
05±1111
AVENSIS REPAIR MANUAL (RM1018E)
2INSPECT COOLER THERMISTOR NO.1
(a)Remove the cooler thermistor No.1 (evaporator temp.
sensor).
(b)Check the resistance between terminal 1 and 2 of cooler thermistor No.1 (evaporator temp. sensor) at each tem-
perature, as shown in the chart.
Standard: 1,500
at 25
C (77
F)
HINT:
As the temperature increases, the resistance decreases.
NGREPLACE COOLER THERMISTOR NO.1
OK
3CHECK HARNESS AND CONNECTOR(COOLER THERMISTOR NO.1 ± A/C AMPLIFIER)
(a)Check for an open or short circuit in harness and connector between term\
inal TE and SG±4 of A/C
amplifier (See page 01±32).
NG REPAIR OR REPLACE HARNESS ORCONNECTOR
OK

05±1112
± DIAGNOSTICSAIR CONDITIONING SYSTEM
AVENSIS REPAIR MANUAL (RM1018E)
4 READ OUTPUT DTC
(a) Clear the DTCs.
(b) Read the DTC at least 8.5 minutes after turning the ignition switch ON.
Standard: Normal codes are output.
NG REPLACE AIR CONDITIONING AMPLIFIER
OK
SYSTEM OK

I35374
C10P±B
22 1
IC1
A1 A/C Ambient Temp. SensorA15 MPX±A/C Control Assembly Combination Meter
*1: 1CD±FTV
*2: 1AZ±FSE
*3: 1AZ±FE, 1ZZ±FE, 3ZZ±FEIC1 P±B P P10 20
11 I14
Integration Relay
C10P
E9A15 MPX+ 20
E1018 Engine and ECT ECU (A/T)Engine ECU (M/T)
(*2) (*1)E921
E1029
(*2) (*1) 14
10 13
P±B
C10W
IE14 12
W
21
C10W±R
IE115 11
W±R MPX2 MPX1
MPX2 MPX1 23
E9
(*3)29
E9
(*3) 05±1106
± DIAGNOSTICSAIR CONDITIONING SYSTEM
AVENSIS REPAIR MANUAL (RM1018E)
DTC 12 AMBIENT TEMPERATURE SENSOR CIRCUIT
CIRCUIT DESCRIPTION
This sensor detects the temperature outside the cabin and sends the appropriate signals to the A/C amplifier.
DTC No.Detection itemTrouble Area
12Open or short in ambient temperature sensor circuit

Thermistor assy (ambient temp. sensor)

Harness or connector between thermistor assy (ambient
temp. sensor) and combination meter

Combination meter

Harness or connector between combination meter and A/C
amplifier assy

A/C amplifier assy
WIRING DIAGRAM
05C7L±01

I37583
C10±12C10±11
I30156
Resistance (k)
Temperature (
C)
± DIAGNOSTICSAIR CONDITIONING SYSTEM
05±1107
AVENSIS REPAIR MANUAL (RM1018E)
INSPECTION PROCEDURE
1 INSPECT COMBINATION METER ASSY
(a) Disconnect the connector from the combination meter
assy.
(b) Measure resistance between the terminal C10±11 and
C10±12 of the ambient temp. sensor connector at each
temperature.
Standard:
9.0 to 9.8 kat 0
C (0
F)
2.7 to 2.9 kat 25
C (77
F)
HINT:
As the temperature increases, resistance decreases.
OK REPLACE COMBINATION METER ASSY
NG

05±1108
± DIAGNOSTICSAIR CONDITIONING SYSTEM
AVENSIS REPAIR MANUAL (RM1018E)
2 CHECK HARNESS AND CONNECTOR(COMBINATION METER ± OUTER AMBIENT
TEMPERATURE SENSOR)
(a) Disconnect the connector from ambient temp. sensor.
(b) Check continuity between the terminal C10±11 (12) of combination meter assy and the terminal A1±1
(2) of ambient temp. sensor connector.
Standard: Continuity
NG REPAIR OR REPLACE HARNESS AND
CONNECTOR
OK
3 READ OUTPUT DTC
(a) Clear the DTCs.
(b) Read the DTC at least 8.5 minutes after turning the ignition switch ON.
Standard: Normal codes are output.
NG REPLACE OUTER AMBIENT TEMPERATURE
SENSOR
OK
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOMS TABLE

I35373
A/C Control Assembly
22
6 A16 TR
SG±5 GR
G
12 A17
A/C Room Temp. Sensor
A16 05±1102
± DIAGNOSTICSAIR CONDITIONING SYSTEM
AVENSIS REPAIR MANUAL (RM1018E)
DTC 11 ROOM TEMPERATURE SENSOR CIRCUIT
CIRCUIT DESCRIPTION
This sensor detects the temperature inside the cabin and sends the appreciate signals to the A/C amplifier.
DTC No.Detection itemTrouble Area
11Open or short in room temperature sensor circuit

Cooler thermistor (room temp. sensor)

Harness or connector between cooler thermistor (room temp.
sensor) and A/C amplifier assy

A/C amplifier assy
WIRING DIAGRAM
05A7M±02

I36144
TRSG±5
A16A15
± DIAGNOSTICSAIR CONDITIONING SYSTEM
05±1103
AVENSIS REPAIR MANUAL (RM1018E)
INSPECTION PROCEDURE
1 INSPECT AIR CONDITIONING AMPLIFIER(TR ± SG±5)
(a) Remove the A/C amplifier with connectors being con-
nected.
(b) Turn the ignition switch to ON.
(c) Measure the voltage between terminal TR and SG±5 of
A/C amplifier connector at each temperature.
Standard:
1.8 to 2.2 V at 25
C (77
F)
1.2 to 1.6 V at 40
C (104
F)
HINT:
As the temperature increases, the voltage decreases.
OK PROCEED TO NEXT CIRCUIT INSPECTION
SHOWN ON PROBLEM SYMPTOMS TABLE
NG

I30111
I30156
Resistance (k
)
Temperature (
C)
05±1104
± DIAGNOSTICSAIR CONDITIONING SYSTEM
AVENSIS REPAIR MANUAL (RM1018E)
2 INSPECT COOLER (ROOM TEMP. SENSOR) THERMISTOR
(a) Remove cooler the thermistor (room temp. sensor).
(b) Measure the resistance between terminal 1 and 2 of cool-
er thermistor (room temp. sensor) connector at each tem-
perature.
Standard:
1,615 to 1,785
at 25
C (77
F)
HINT:
As the temperature increases, the resistance decreases.
NG REPLACE COOLER (ROOM TEMP. SENSOR)
THERMISTOR
OK

±
DIAGNOSTICS AIR CONDITIONING SYSTEM
05±1105
AVENSIS REPAIR MANUAL (RM1018E)
3CHECK HARNESS AND CONNECTOR(COOLER (ROOM TEMP. SENSOR)
THERMISTOR ± A/C AMPLIFIER)
(a)Check for an open or short circuit in harness and connector between terminal TR an\
d SG±5 of A/C
amplifier (See page 01±32).
NG REPAIR OR REPLACE HARNESS ORCONNECTOR
OK
4 READ OUTPUT DTC
(a) Clear the DTCs.
(b) Read the DTC at least 8.5 minutes after turning the ignition switch ON. Standard: Normal codes are output.
MG REPLACE AIR CONDITIONING AMPLIFIER
OK
SYSTEM OK

050TM±13
05±1100
±
DIAGNOSTICS AIR CONDITIONING SYSTEM
AVENSIS REPAIR MANUAL (RM1018E)
PROBLEM SYMPTOMS TABLE
If the normal code is displayed during DTC check although the problem still occurs, check the circuits for
each problem symptom in the order given in the table below, and proceed to the relevant troubleshooting.
SymptomSuspect AreaSee page
Whole functions of the A/C system does not operate.
1. IG power source circuit
2. A/C amplifier assy
3. Engine ECU 1AZ±FSE: 1AZ±FE:
1ZZ±FE/3ZZ±FE:
1CD±FTV:05±1144
05±1098 05±294
05±149 05±5
05±528
Air Flow Control : No blower operation
1. Blower motor circuit
2. Heater relay circuit
3. Blower w/fan motor sub±assy
4. A/C amplifier assy05±1148
05±1146
05±1148
05±1098
Air Flow Control : No blower control1. Blower motor circuit05±1148
Air Flow Control : Insufficient air out
1. Blower w/fan motor sub±assy
2. Blower motor circuit
3. A/C amplifier assy05±1148
05±1148
05±1098
Temperature Control : Cool air does not come out
1. Volume of refrigerant
2. Drive belt tension
3. Refrigerant pressure
4. Air conditioner magnetic valve circut
5. Pressure sensor circuit
6. Air mix control servomotor circuit
7. Air mix damper position sensor circuit
8. Room temp. sensor circuit
9. Ambient temp. sensor circuit
10.A/C amplifier assy55±24
55±46
55±24
05±1151 05±1116
05±1133
05±1122
05±1102
05±1106
05±1098
Temperature Control : Warm air does not come out
1. Air mix control servomotor circuit
2. Air mix damper position sensor circuit
3. Ambient temp. sensor circuit
4. Room temp. sensor circuit
5. A/C amplifier assy
6. Heater radiator05±1133
05±1122
05±1106
05±1102
05±1098
±
Temperature Control : Output air is warmer or cooler than the set
temperature or response is slow.
1. Room temp. sensor circuit
2. Ambient temp. sensor circuit
3. Solar sensor circuit
4. Air mix damper position sensor circuit
5. Air mix control servomotor circuit
6. Evaporator temp. sensor circuit
7. A/C amplifier assy05±1102
05±110605±1113
05±1122
05±1133
05±1109
05±1098
Temperature Control : No temperature control (only Max. cool or Max. warm)
1. Room temp. sensor circuit
2. Ambient temp. sensor circuit
3. Solar sensor circuit
4. Air mix damper position sensor circuit
5. Air mix control servomotor circuit
6. Evaporator temp. sensor circuit
7. A/C amplifier assy05±1102
05±1106
05±1113
05±1122
05±1133
05±1109
05±1098
No air inlet control1. Recirculation damper servomotor circuit
2. A/C amplifier assy05±1153
05±1098
No air outlet control
1. Air outlet damper position sensor circuit
2. Air outlet control servomotor circuit
3. A/C amplifier assy05±1126
05±1136
05±1098