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Air Conditioning System Diagnosis - Except Hev: Specifications Kia Optima III

Automatic HVAC System 46 illustrations ~3883 words

Specification

* Voltage value of Air Mix potentiometer as a function of temp door position.

Door positionVoltage
Max. cool0.3±0.15V
Max. warm4.7±0.15V

VOLTAGE SPECIFICATION

Scheme 89

Scheme 89: Diagnostic Circuit Diagram

Scheme 90

Scheme 90: Monitor Scantool Data
  1. Check Actuation Test Connect scantool with diagnostic connector. Warm up the engine to normal temperature after engine start. Select "Air Mix Door Potentiometer-Passenger" parameter on the current data with scantool. Perform Actuation Test for "Passenger Air Mix Door - 0% / 50% / 100%. With performing Actuation test, check that the value of Air Mix Door Potentiometer is changed and close to the value of Actuation Test. Specification : Check that the value of Air Mix Door Potentiometer at current data should be close to the value of the actuation test. Does the value of current data follow in accordance with the each actuation test? YES This may be a intermittent problem caused by poor contact of component or the Control Unit. Thoroughly check for looseness, poor connection, bent, corrosion, contamination, deformation or damage of connector. Monitoring with a DVOM on min/max or VMI while wiggling connectors may help find the problem. Any change in voltage indicate a possible problem. Repair or replace as necessary and then, go to «VERIFICATION OF VEHICLE REPAIR»(ref-429644-S38331160632011101500000) procedure. NO Go to «INSPECTION/REPAIR»(ref-429644-S26984725172011101500000) procedure.

* Voltage value of Air Mix potentiometer as a function of temp door position.

Door positionVoltage
Max. cool0.3±0.15V
Max. warm4.7±0.15V

VOLTAGE SPECIFICATION

Scheme 91

Scheme 91: Diagnostic Circuit Diagram

Scheme 92

Scheme 92: Monitor Scantool Data
  1. Check Actuation Test Connect scantool with diagnostic connector. Warm up the engine to normal temperature after engine start. Select "Air Mix Door Potentiometer-Passenger" parameter on the current data with scantool. Perform Actuation Test for "Passenger Air Mix Door - 0% / 50% / 100%. With performing Actuation test, check that the value of Air Mix Door Potentiometer is changed and close to the value of Actuation Test. Specification : Check that the value of Air Mix Door Potentiometer at current data should be close to the value of the actuation test. Does the value of current data follow in accordance with the each actuation test? YES This may be a intermittent problem caused by poor contact of component or the Control Unit. Thoroughly check for looseness, poor connection, bent, corrosion, contamination, deformation or damage of connector. Monitoring with a DVOM on min/max or VMI while wiggling connectors may help find the problem. Any change in voltage indicate a possible problem. Repair or replace as necessary and then, go to «VERIFICATION OF VEHICLE REPAIR»(ref-429644-S13573129862011101500000) procedure. NO Go to «INSPECTION/REPAIR»(ref-429644-S31468186082011101500000) procedure.

* Voltage value of Intake potentiometer as a function of position of Intake door

Door positionVoltage
FRE0.3±0.15V
REC4.65±0.15V

VOLTAGE SPECIFICATION

Scheme 93

Scheme 93: Diagnostic Circuit Diagram

Scheme 94

Scheme 94: Monitor Scantool Data
  1. Check Actuation Test Connect scantool with diagnostic connector. Warm up the engine to normal temperature after engine start. Select "Intake Potentiometer" parameter on the current data with scantool. Perform Actuation Test for Air Inlet Mode Selection - Recirculation/Fresh in order. With performing Actuation test, check that the value of each position sensors are changing. Specification : Recirculation : About 90%, Fresh : About 10%. Are the value of each position sensors changed when performing actuation test? YES This may be a intermittent problem caused by poor contact of component or the Control Unit. Thoroughly check for looseness, poor connection, bent, corrosion, contamination, deformation or damage of connector. Monitoring with a DVOM on min/max or VMI while wiggling connectors may help find the problem. Any change in voltage indicate a possible problem. Repair or replace as necessary and then, go to «VERIFICATION OF VEHICLE REPAIR»(ref-429644-S13675822472011101500000) procedure. NO Go to «INSPECTION/REPAIR»(ref-429644-S02258344422011101500000) procedure.

* Voltage value of Intake potentiometer as a function of position of Intake door

Door positionVoltage
FRE0.3±0.15V
REC4.65±0.15V

VOLTAGE SPECIFICATION

Scheme 95

Scheme 95: Diagnostic Circuit Diagram

Scheme 96

Scheme 96: Monitor Scantool Data
  1. Check Actuation Test Connect scantool with diagnostic connector. Warm up the engine to normal temperature after engine start. Select "Intake Potentiometer" parameter on the current data with scantool. Perform Actuation Test for Air Inlet Mode Selection - Recirculation/Fresh in order. With performing Actuation test, check that the value of each position sensors are changing. Specification : Recirculation : About 90%, Fresh : About 10%. Are the value of each position sensors changed when performing actuation test? YES This may be a intermittent problem caused by poor contact of component or the Control Unit. Thoroughly check for looseness, poor connection, bent, corrosion, contamination, deformation or damage of connector. Monitoring with a DVOM on min/max or VMI while wiggling connectors may help find the problem. Any change in voltage indicate a possible problem. Repair or replace as necessary and then, go to «VERIFICATION OF VEHICLE REPAIR»(ref-429644-S03255787602011101500000) procedure. NO Go to «INSPECTION/REPAIR»(ref-429644-S09404398842011101500000) procedure.

* Resistance value of in car temp sensor as a function of temperature.

Temperature (°C/°F)Resistance (kohms)Temperature (°C/°F)Resistance (kohms)
20/-4285.620/6837.4
10/1416430/8624.1
0/3297.740/10415.9
10/5059.6750/12210.8

RESISTANCE TEMPERATURE SPECIFICATION

Scheme 97

Scheme 97: Diagnostic Circuit Diagram

Scheme 98

Scheme 98: Monitor Scantool Data
  1. Connect scantool with diagnostic connector.
  2. Warm up the engine to normal engine temperature after engine starts.
  3. Select and monitor "In-car temperature sensor" parameter. Parameter of "IN CAR TEMP. SENSOR" will be fixed at 25°C (77°F), if there is any fault in IN CAR SENSOR.
  4. Is the In car temperature sensor normal? YES Go to «INSPECTION AND REPAIR»(ref-429644-S16089494262011101500000) procedure. NO This may be a intermittent problem caused by poor contact of component or the Control Unit. Thoroughly check for looseness, poor connection, bent, corrosion, contamination, deformation or damage of connector. Monitoring with a DVOM on min/max or VMI while wiggling connectors may help find the problem. Any change in voltage indicate a possible problem. Repair or replace as necessary and then, go to «VERIFICATION OF VEHICLE REPAIR»(ref-429644-S03020646862011101500000) procedure.

* Resistance value of in car temp sensor as a function of temperature.

Temperature (°C/°F)Resistance (kohms)Temperature (°C/°F)Resistance (kohms)
20/-4285.620/6837.4
10/1416430/8624.1
0/3297.740/10415.9
10/5059.6750/12210.8

RESISTANCE TEMPERATURE SPECIFICATION

Scheme 99

Scheme 99: Diagnostic Circuit Diagram

Scheme 100

Scheme 100: Monitor Scantool Data
  1. Connect scantool with diagnostic connector.
  2. Warm up the engine to normal engine temperature after engine starts.
  3. Select and monitor "In-car temperature sensor" parameter. Parameter of "IN CAR TEMP. SENSOR1" will be fixed at 25°C (77°F), if there is any fault in IN CAR SENSOR.
  4. Is the In car temperature sensor normal? YES Go to «INSPECTION AND REPAIR»(ref-429644-S00529774362011101500000) procedure. NO This may be a intermittent problem caused by poor contact of component or the Control Unit. Thoroughly check for looseness, poor connection, bent, corrosion, contamination, deformation or damage of connector. Monitoring with a DVOM on min/max or VMI while wiggling connectors may help find the problem. Any change in voltage indicate a possible problem. Repair or replace as necessary and then, go to «VERIFICATION OF VEHICLE REPAIR»(ref-429644-S38848850962011101500000) procedure.

* Resistance value of ambient temp. sensor as a function of temperature.

Temperature (°C/°F)Resistance (kohms)Temperature (°C/°F)Resistance (kohms)
20/-4271.450/12211
0/3295.160/1407.58
25/7730

RESISTANCE TEMPERATURE SPECIFICATION

Scheme 101

Scheme 101: Diagnostic Circuit Diagram

Scheme 102

Scheme 102: Monitor Scantool Data
  1. Connect scantool with diagnostic connector.
  2. Warm up the engine to normal engine temperature after engine starts.
  3. Select and monitor "Ambient Air Temperature sensor" parameter. Parameter of "Ambient Sensor" will be fixed at 68°F (20°C), if there is any fault in Ambient Sensor.
  4. Is the ambient sensor abnormal? YES Go to «INSPECTION AND REPAIR»(ref-429644-S04882452362011101500000) procedure. NO This may be a intermittent problem caused by poor contact of component or the Control Unit. Thoroughly check for looseness, poor connection, bent, corrosion, contamination, deformation or damage of connector. Monitoring with a DVOM on min/max or VMI while wiggling connectors may help find the problem. Any change in voltage indicate a possible problem. Repair or replace as necessary and then, go to «VERIFICATION OF VEHICLE REPAIR»(ref-429644-S30529845142011101500000) procedure.

* Resistance value of ambient temp. sensor as a function of temperature.

Temperature (°C/°F)Resistance (kohms)Temperature (°C/°F)Resistance (kohms)
20/-4271.450/12211
0/3295.160/1407.58
25/7730

RESISTANCE TEMPERATURE SPECIFICATION

Scheme 103

Scheme 103: Diagnostic Circuit Diagram

Scheme 104

Scheme 104: Monitor Scantool Data
  1. Connect scantool with diagnostic connector.
  2. Warm up the engine to normal engine temperature after engine starts.
  3. Select and monitor "Ambient Air Temperature sensor" parameter. Parameter of "Ambient Sensor" will be fixed at 68°F (20°C), if there is any fault in Ambient Sensor.
  4. Is the ambient sensor abnormal? YES Go to «INSPECTION AND REPAIR»(ref-429644-S08684189532011101500000) procedure. NO This may be a intermittent problem caused by poor contact of component or the Control Unit. Thoroughly check for looseness, poor connection, bent, corrosion, contamination, deformation or damage of connector. Monitoring with a DVOM on min/max or VMI while wiggling connectors may help find the problem. Any change in voltage indicate a possible problem. Repair or replace as necessary and then, go to «VERIFICATION OF VEHICLE REPAIR»(ref-429644-S32351048112011101500000) procedure.

* Resistance value of evaporator sensor as a function of temperature.

Temperature (°C/°F)Resistance (kohms)Temperature (°C/°F)Resistance (kohms)
25/1443.320/6812.1
0/3227.630/868.3
10/501840/1045.8

RESISTANCE TEMPERATURE SPECIFICATION

Scheme 105

Scheme 105: Diagnostic Circuit Diagram

Scheme 106

Scheme 106: Monitor Scantool Data
  1. Connect scantool with diagnostic connector.
  2. Warm up the engine to normal engine temperature after engine starts.
  3. Select and monitor "Evaporator sensor" parameter on scantool. Parameter of "Evaporator Sensor" will be fixed at -2°C (28.4°F), if there is any fault in Evaporator Sensor.
  4. Is the Evaporator Sensor abnormal? YES Go to «INSPECTION AND REPAIR»(ref-429644-S06076998412011101500000) procedure. NO This may be a intermittent problem caused by poor contact of component or the Control Unit. Thoroughly check for looseness, poor connection, bent, corrosion, contamination, deformation or damage of connector. Monitoring with a DVOM on min/max or VMI while wiggling connectors may help find the problem. Any change in voltage indicate a possible problem. Repair or replace as necessary and then, go to «VERIFICATION OF VEHICLE REPAIR»(ref-429644-S14965537952011101500000) procedure.

* Voltage value of Air Mix potentiometer as a function of temp door position.

Door positionVoltage
Max. cool0.3±0.15V
Max. warm4.7±0.15V

VOLTAGE SPECIFICATION

Scheme 107

Scheme 107: Diagnostic Circuit Diagram

Scheme 108

Scheme 108: Monitor Scantool Data
  1. Actuation Test Connect scantool with diagnostic connector. Warm up the engine to normal engine temperature after engine starts. Select and monitor "Air Mix Door Potentioner-Driver" parameter on scantool. Select and perform Actuation test Air Mix Door Potentioner-Driver - 0% / 50% / 100% in order. With performing Actuation test, check that the value of Air Mix Door Potentiometer follows is changed and close to the value of Actuation Test. Specification : Check that the value of Air Mix Door Potentiometer at current data should be close to the value of the actuation test. Does the value of current data follow in accordance with the each actuation test? YES This may be a intermittent problem caused by poor contact of component or the Control Unit. Thoroughly check for looseness, poor connection, bent, corrosion, contamination, deformation or damage of connector. Monitoring with a DVOM on min/max or VMI while wiggling connectors may help find the problem. Any change in voltage indicate a possible problem. Repair or replace as necessary and then, go to «VERIFICATION OF VEHICLE REPAIR»(ref-429644-S20751408372011101500000) procedure. NO Go to «INSPECTION/REPAIR»(ref-429644-S07715861562011101500000) procedure.

* Voltage value of Air Mix potentiometer as a function of temp door position.

Door positionVoltage
Max. cool0.3±0.15V
Max. warm4.7±0.15V

VOLTAGE SPECIFICATION

Scheme 109

Scheme 109: Diagnostic Circuit Diagram

Scheme 110

Scheme 110: Monitor Scantool Data
  1. Actuation Test Connect scantool with diagnostic connector. Warm up the engine to normal engine temperature after engine starts. Select and monitor "Air Mix Door Potentioner-Driver" parameter on scantool. Select and perform Actuation test Air Mix Door Potentioner-Driver - 0% / 50% / 100% in order. With performing Actuation test, check that the value of Air Mix Door Potentiometer follows is changed and close to the value of Actuation Test. Specification : Check that the value of Air Mix Door Potentiometer at current data should be close to the value of the actuation test. Does the value of current data follow in accordance with the each actuation test? YES This may be a intermittent problem caused by poor contact of component or the Control Unit. Thoroughly check for looseness, poor connection, bent, corrosion, contamination, deformation or damage of connector. Monitoring with a DVOM on min/max or VMI while wiggling connectors may help find the problem. Any change in voltage indicate a possible problem. Repair or replace as necessary and then, go to «VERIFICATION OF VEHICLE REPAIR»(ref-429644-S07299388172011101500000) procedure. NO Go to «INSPECTION/REPAIR»(ref-429644-S16314644102011101500000) procedure.

* Voltage value of potentiometer as a function of mode door position.

Mode Door PositionVoltage
VENT0.3±0.15V
BI-LEVEL1.4±0.4V
FLOOR2.5±0.4V
MIX3.6±0.4V
DEF4.7±0.15V

VOLTAGE SPECIFICATION

Scheme 111

Scheme 111: Diagnostic Circuit Diagram

Scheme 112

Scheme 112: Monitor Scantool Data
  1. Actuation Test Connect scantool with diagnostic connector. Warm up the engine to normal engine temperature after engine starts. Select and monitor "Direction Potention" parameter on scantool. Select and perform Actuation test Driver Mode Door - Face / Foot / Defrost in order. Check that the value of all the parameters are changed when performing the actuation test. Specification : Face - About below 10%, Foot : About 50%, Defrost : About 90%. Are all the parameters changed when performing Actuation test? YES This may be a intermittent problem caused by poor contact of component or the Control Unit. Thoroughly check for looseness, poor connection, bent, corrosion, contamination, deformation or damage of connector. Monitoring with a DVOM on min/max or VMI while wiggling connectors may help find the problem. Any change in voltage indicate a possible problem. Repair or replace as necessary and then, go to «VERIFICATION OF VEHICLE REPAIR»(ref-429644-S02359692082011101500000) procedure. NO Go to «INSPECTION/REPAIR»(ref-429644-S38340089852011101500000) procedure.

* Resistance value of evaporator sensor as a function of temperature.

Temperature (°C/°F)Resistance (kohms)Temperature (°C/°F)Resistance (kohms)
25/1443.320/6812.1
0/3227.630/868.3
10/501840/1045.8

RESISTANCE TEMPERATURE SPECIFICATION

Scheme 113

Scheme 113: Diagnostic Circuit Diagram

Scheme 114

Scheme 114: Monitor Scantool Data
  1. Connect scantool with diagnostic connector.
  2. Warm up the engine to normal engine temperature after engine starts.
  3. Select and monitor "Evaporator sensor" parameter on scantool. Parameter of "Evaporator Sensor" will be fixed at -2°C (28.4°F), if there is any fault in Evaporator Sensor.
  4. Is the Evaporator Sensor abnormal? YES Go to «INSPECTION AND REPAIR»(ref-429644-S23823013322011101500000) procedure. NO This may be a intermittent problem caused by poor contact of component or the Control Unit. Thoroughly check for looseness, poor connection, bent, corrosion, contamination, deformation or damage of connector. Monitoring with a DVOM on min/max or VMI while wiggling connectors may help find the problem. Any change in voltage indicate a possible problem. Repair or replace as necessary and then, go to «VERIFICATION OF VEHICLE REPAIR»(ref-429644-S21173349662011101500000) procedure.

* Voltage value of potentiometer as a function of mode door position.

Mode Door PositionVoltage
VENT0.3±0.15V
BI-LEVEL1.4±0.4V
FLOOR2.5±0.4V
MIX3.6±0.4V
DEF4.7±0.15V

VOLTAGE SPECIFICATION

Scheme 115

Scheme 115: Diagnostic Circuit Diagram

Scheme 116

Scheme 116: Monitor Scantool Data
  1. Actuation Test Connect scantool with diagnostic connector. Warm up the engine to normal engine temperature after engine starts. Select and monitor "Direction Potention" parameter on scantool. Select and perform Actuation test Driver Mode Door - Face / Foot / Defrost in order. Check that the value of all the parameters are changed when performing the actuation test. Specification : Face - About below 10%, Foot : About 50%, Defrost : About 90%. Are all the parameters changed when performing Actuation test? YES This may be a intermittent problem caused by poor contact of component or the Control Unit. Thoroughly check for looseness, poor connection, bent, corrosion, contamination, deformation or damage of connector. Monitoring with a DVOM on min/max or VMI while wiggling connectors may help find the problem. Any change in voltage indicate a possible problem. Repair or replace as necessary and then, go to «VERIFICATION OF VEHICLE REPAIR»(ref-429644-S17433826102011101500000) procedure. NO Go to «INSPECTION/REPAIR»(ref-429644-S37171879622011101500000) procedure.

* Hz of Defogger sensor according to Humidity

(%RH)(Hz)(%RH)(Hz)
037.196034.8
2036.48034
4035.610033.2

HZ OF DEFOGGER SENSOR SPECIFICATION

Scheme 117

Scheme 117: Diagnostic Circuit Diagram

Scheme 118

Scheme 118: Monitor Scantool Data
  1. Connect scantool with diagnostic connector.
  2. Warm up the engine to normal temperature after engine starts.
  3. Select and monitor "Auto defogger humidity sensor" parameter on scantool. If the DTC related auto defogger sensor is set, Air condition control Module regards and controls humidity as 0%.
  4. Is the defogger sensor normal? YES Go to «INSPECTION & REPAIR»(ref-429644-S00986130272011101500000) procedure. NO This may be a intermittent problem caused by poor contact of component or the Control Unit. Thoroughly check for looseness, poor connection, bent, corrosion, contamination, deformation or damage of connector. Monitoring with a DVOM on min/max or VMI while wiggling connectors may help find the problem. Any change in voltage indicate a possible problem. Repair or replace as necessary and then, go to «VERIFICATION OF VEHICLE REPAIR»(ref-429644-S20741832212011101500000) procedure.

* Hz of Defogger sensor according to Humidity

(%RH)(Hz)(%RH)(Hz)
037.196034.8
2036.48034
4035.610033.2

HZ OF DEFOGGER SENSOR SPECIFICATION

Scheme 119

Scheme 119: Diagnostic Circuit Diagram

Scheme 120

Scheme 120: Monitor Scantool Data
  1. Connect scantool with diagnostic connector.
  2. Warm up the engine to normal temperature after engine starts.
  3. Select and monitor "Auto defogger humidity sensor" parameter on scantool. If the DTC related auto defogger sensor is set, Air condition control Module regards and controls humidity as 0%.
  4. Is the defogger sensor abnormal? YES Go to «INSPECTION & REPAIR»(ref-429644-S37597520702011101500000) procedure. NO This may be a intermittent problem caused by poor contact of component or the Control Unit. Thoroughly check for looseness, poor connection, bent, corrosion, contamination, deformation or damage of connector. Monitoring with a DVOM on min/max or VMI while wiggling connectors may help find the problem. Any change in voltage indicate a possible problem. Repair or replace as necessary and then, go to «VERIFICATION OF VEHICLE REPAIR»(ref-429644-S01822869162011101500000) procedure.

* Voltage output according to Actuator position

Door positionVoltage
CLOSE (VENT, B/L)About 4.7V
FLOORAbout 3.94V
MIXAbout 3.29V
OPEN (DEF)About 1V

VOLTAGE SPECIFICATION

Scheme 121

Scheme 121: Diagnostic Circuit Diagram

Scheme 122

Scheme 122: Monitor Scantool Data
  1. Actuation Test Connect scantool with diagnostic connector. Warm up the engine to normal temperature after engine start. Select and monitor "Auto defogger mode direction potentiometer" parameter on current data. Perform Actuation Test for "Auto Defogger Mode Door -0% (close)/50%/100% (open)" in order. Check that the value of auto defogger mode actuator is changed with performing actuation test. Specification : 0%(close) : About 90%, 50% : About 55%, 100%(open) : About 20%. Does the value of auto defogger mode actuator follow the specification? YES This may be a intermittent problem caused by poor contact of component or the Control Unit. Thoroughly check for looseness, poor connection, bent, corrosion, contamination, deformation or damage of connector. Monitoring with a DVOM on min/max or VMI while wiggling connectors may help find the problem. Any change in voltage indicate a possible problem. Repair or replace as necessary and then, go to «VERIFICATION OF VEHICLE REPAIR»(ref-429644-S33249907702011101500000) procedure. NO Go to «INSPECTION/REPAIR»(ref-429644-S15724246242011101500000) procedure.

* Voltage output according to Actuator position

Door positionVoltage
CLOSE (VENT, B/L)About 4.7V
FLOORAbout 3.94V
MIXAbout 3.29V
OPEN (DEF)About 1V

VOLTAGE SPECIFICATION

Scheme 123

Scheme 123: Diagnostic Circuit Diagram

Scheme 124

Scheme 124: Monitor Scantool Data
  1. Actuation Test Connect scantool with diagnostic connector. Warm up the engine to normal temperature after engine start. Select and monitor "Auto defogger mode direction potentiometer" parameter on current data. Perform Actuation Test for "Auto Defogger Mode Door -0% (close)/50%/100% (open)" in order. Check that the value of auto defogger mode actuator is changed with performing actuation test. Specification : 0%(close) : About 90%, 50% : About 55%, 100%(open) : About 20%. Does the value of auto defogger mode actuator follow the specification? YES This may be a intermittent problem caused by poor contact of component or the Control Unit. Thoroughly check for looseness, poor connection, bent, corrosion, contamination, deformation or damage of connector. Monitoring with a DVOM on min/max or VMI while wiggling connectors may help find the problem. Any change in voltage indicate a possible problem. Repair or replace as necessary and then, go to «VERIFICATION OF VEHICLE REPAIR»(ref-429644-S10151623872011101500000) procedure. NO Go to «INSPECTION/REPAIR»(ref-429644-S19410863692011101500000) procedure.

* The voltage of auto defogger mode actuator in accordance with position

Door positionVoltage
CLOSE (VENT, B/L)About 4.7V
FLOORAbout 3.94V
MIXAbout 3.29V
OPEN (DEF)About 1V

VOLTAGE SPECIFICATION

Scheme 125

Scheme 125: Diagnostic Circuit Diagram

Scheme 126

Scheme 126: Monitor Scantool Data
  1. Actuation Test Connect scantool with diagnostic connector. Warm up the engine to normal temperature after engine start. Select and monitor "Auto defogger mode actuator" parameter on current data. Perform Actuation Test for "auto defogger actuator -0% (close)/50%/100% (open)" in order. Check that the value of auto defogger mode actuator is changed with performing actuation test. Specification : 0%(close) : About 90%, 50% : About 55%, 100%(open) : About 20%. Does the value of auto defogger mode actuator follow the specification? YES This may be a intermittent problem caused by poor contact of component or the Control Unit. Thoroughly check for looseness, poor connection, bent, corrosion, contamination, deformation or damage of connector. Monitoring with a DVOM on min/max or VMI while wiggling connectors may help find the problem. Any change in voltage indicate a possible problem. Repair or replace as necessary and then, go to «VERIFICATION OF VEHICLE REPAIR»(ref-429644-S12256572012011101500000) procedure. NO Go to «INSPECTION/REPAIR»(ref-429644-S01284418082011101500000) procedure.

* Voltage value of Air Mix potentiometer as a function of temp door position.

Door positionVoltage
Max. cool0.3±0.15V
Max. warm4.7±0.15V

VOLTAGE SPECIFICATION

Scheme 127

Scheme 127: Diagnostic Circuit Diagram

Scheme 128

Scheme 128: Monitor Scantool Data
  1. Actuation Test Connect scantool with diagnostic connector. Warm up the engine to normal engine temperature after engine starts. Select and monitor "Air Mix Door Potentioner-Driver" parameter on scantool. Select and perform Actuation test Air Mix Door Potentioner-Driver - 0% / 50% / 100% in order. Check that the value of all the parameters are changed when performing the actuation test. Specification : Check that the value of Air Mix Door Potentiometer at current data should be close to the value of the actuation test. Does the value of current data follow in accordance with the each actuation test? YES This may be a intermittent problem caused by poor contact of component or the Control Unit. Thoroughly check for looseness, poor connection, bent, corrosion, contamination, deformation or damage of connector. Monitoring with a DVOM on min/max or VMI while wiggling connectors may help find the problem. Any change in voltage indicate a possible problem. Repair or replace as necessary and then, go to «VERIFICATION OF VEHICLE REPAIR»(ref-429644-S10044465422011101500000) procedure. NO Go to «INSPECTION/REPAIR»(ref-429644-S09514075302011101500000) procedure.

* Voltage value of Intake potentiometer as a function of position of Intake door

Door positionVoltage
FRE0.3±0.15V
REC4.7±0.15V

VOLTAGE SPECIFICATION

Scheme 129

Scheme 129: Diagnostic Circuit Diagram

Scheme 130

Scheme 130: Monitor Scantool Data
  1. Check Actuation Test Connect scantool with diagnostic connector. Warm up the engine to normal temperature after engine start. Select "Intake Potentiometer" parameter on the current data with scantool. Perform Actuation Test for Air Inlet Mode Selection - Recirculation/Fresh in order. With performing Actuation test, check that the value of each position sensors are changing. Specification : Recirculation : About 90%, Fresh : About 10%. Are the value of each position sensors changed when performing actuation test? YES This may be a intermittent problem caused by poor contact of component or the Control Unit. Thoroughly check for looseness, poor connection, bent, corrosion, contamination, deformation or damage of connector. Monitoring with a DVOM on min/max or VMI while wiggling connectors may help find the problem. Any change in voltage indicate a possible problem. Repair or replace as necessary and then, go to «VERIFICATION OF VEHICLE REPAIR»(ref-429644-S40637982582011101500000) procedure. NO Go to «INSPECTION/REPAIR»(ref-429644-S21613201922011101500000) procedure.

* Voltage value of potentiometer as a function of mode door position.

Mode Door PositionVoltage
VENT0.3±0.15V
BI-LEVEL1.4±0.4V
FLOOR2.5±0.4V
MIX3.6±0.4V
DEF4.7±0.15V

VOLTAGE SPECIFICATION

Scheme 131

Scheme 131: Diagnostic Circuit Diagram

Scheme 132

Scheme 132: Monitor Scantool Data
  1. Actuation Test Connect scantool with diagnostic connector. Warm up the engine to normal engine temperature after engine starts. Select and monitor "Direction Potention" parameter on scantool. Select and perform Actuation test Driver Mode Door - Face / Foot / Defrost in order. Check that the value of all the parameters are changed when performing the actuation test. Specification : Face - About below 10%, Foot : About 50%, Defrost : About 90%. Are all the parameters changed when performing Actuation test? YES This may be a intermittent problem caused by poor contact of component or the Control Unit. Thoroughly check for looseness, poor connection, bent, corrosion, contamination, deformation or damage of connector. Monitoring with a DVOM on min/max or VMI while wiggling connectors may help find the problem. Any change in voltage indicate a possible problem. Repair or replace as necessary and then, go to «VERIFICATION OF VEHICLE REPAIR»(ref-429644-S26810241292011101500000) procedure. NO Go to «INSPECTION/REPAIR»(ref-429644-S07793366672011101500000) procedure.

* Voltage value of Air Mix potentiometer as a function of temp door position.

Door positionVoltage
Max. cool0.3±0.15V
Max. warm4.7±0.15V

VOLTAGE SPECIFICATION

Scheme 133

Scheme 133: Diagnostic Circuit Diagram

Scheme 134

Scheme 134: Monitor Scantool Data
  1. Check Actuation Test Connect scantool with diagnostic connector. Warm up the engine to normal temperature after engine start. Select "Air Mix Door Potentiometer-Passenger" parameter on the current data with scantool. Perform Actuation Test for "Passenger Air Mix Door - 0% / 50% / 100%. With performing Actuation test, check that the value of Air Mix Door Potentiometer is changed and close to the value of Actuation Test. Specification : Check that the value of Air Mix Door Potentiometer at current data should be close to the value of the actuation test. Does the value of current data follow in accordance with the each actuation test? YES This may be a intermittent problem caused by poor contact of component or the Control Unit. Thoroughly check for looseness, poor connection, bent, corrosion, contamination, deformation or damage of connector. Monitoring with a DVOM on min/max or VMI while wiggling connectors may help find the problem. Any change in voltage indicate a possible problem. Repair or replace as necessary and then, go to «VERIFICATION OF VEHICLE REPAIR»(ref-429644-S12101484392011101500000) procedure. NO Go to «INSPECTION/REPAIR»(ref-429644-S06074867722011101500000) procedure.