B1436/36
Diagnostic trouble codes
DESCRIPTION
This sensor detects the position of the air mix control servomotor (air outlet damper) and sends the appropriate signals to the A/C amplifier assembly. The position sensor is built in the air mix control servomotor. The position sensor resistance changes as the air mix control arm moves.
It outputs voltage (5 V) that is input to terminal 1 (VZ) and terminal 3 (PT) via the variable resistor, and then to the A/C amplifier assembly. The A/C amplifier assembly reads the arm position with the input voltage from the position sensor.
| DTC No. |
DTC Detecting Condition |
Trouble Area |
| B1436/36 |
Open or short in power source circuit in air mix damper position sensor circuit. |
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WIRING DIAGRAM
INSPECTION PROCEDURE
| 1. READ VALUE OF INTELLIGENT TESTER |
Connect the intelligent tester to the DLC3.
Turn the ignition switch ON and push the intelligent tester main switch on.
Select the items below in the DATA LIST, and read the display on the intelligent tester.
| Item |
Measurement Item/Display (Range) |
Normal Condition |
Diagnostic Note |
| A/M DAMP POS-D |
Air mix damper position (Driver side) / min.: -14% max.: 113.5% |
Damper is at "MAX. COOL": -5% Damper is at "MAX. HOT": 105% |
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| A/M DAMP TARG-D |
Air mix damper target position (Driver side) / min.: -14% max.: 113.5% |
- OK:
- The display is as specified in the normal condition.
- Result:
Result
Proceed to
NG
A
OK (Checking from the PROBLEM SYMPTOM TABLE)
B
OK (Checking from the DTC)
C
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| A | |
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| 2. INSPECT AIR CONDITIONING AMPLIFIER ASSEMBLY |
Remove the A/C amplifier assembly with the connectors still connected.
Change the set temperature to activate the air mix control servomotor.
Measure the voltage according to the value(s) in the table below.
- Voltage:
Tester connection
(Symbols)
Condition
Specified condition
A10-9 (TPD) - A10-20 (SG-1)
Ignition switch ON
MAX. HOT position
0.82 to 0.88 V
A10-9 (TPD) - A10-20 (SG-1)
Ignition switch ON
MAX. COOL position
4.12 to 4.18 V
A10-23 (S5-1) - A10-20 (SG-1)
Ignition switch ON
4.5 to 5.5 V
A10-23 (S5-1) - A10-20 (SG-1)
Ignition switch OFF
Below 1 V
- HINT:
- As the set temperature increases, the voltage decreases gradually without interruption.
- Result:
Result
Proceed to
NG
A
OK (Checking from the PROBLEM SYMPTOMS TABLE)
B
OK (Checking from the DTC)
C
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| A | |
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| 3. INSPECT AIR MIX CONTROL SERVOMOTOR |
Remove the air mix control servomotor.
Disconnect the connector from the air mix control servomotor.
Measure the resistance according to the value(s) in the table below.
- Resistance:
Tester connection
(Symbols)
Condition
Specified condition
A20-1 (VZ) - A20-2 (GND)
Always
4.2 to 7.8 kΩ
Measure the resistance according to the value(s) in the table below.
- Resistance:
Tester connection
(Symbols)
Condition
Specified condition
A20-3 (PT) - A20-2 (GND)
MAX. COOL position
3.5 to 6.5 kΩ
A20-3 (PT) - A20-2 (GND)
MAX. HOT position
0.7 to 1.3 kΩ
As the air mix control servomotor is moved from the "COOL" side to "HOT" side, the resistance decreases gradually without interruption.
- HINT:
- For details regarding operation of the servomotor (Click here).
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| OK | |
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| 4. CHECK HARNESS AND CONNECTOR (AIR MIX CONTROL SERVOMOTOR - A/C AMPLIFIER ASSEMBLY) |
Disconnect the connector from the A/C amplifier assembly.
Measure the resistance according to the value(s) in the table below.
- Resistance:
Tester connection
(Symbols)
Condition
Specified condition
A10-9 (TPD) - A20-3 (PT)
Always
Below 1 Ω
A10-20 (SG-1) - A20-2 (GND)
Always
Below 1 Ω
A10-23 (S5-1) - A20-1 (VZ)
Always
Below 1 Ω
A10-9 (TPD) - Body ground
Always
10 kΩ or higher
A10-20 (SG-1) - Body ground
Always
10 kΩ or higher
A10-23 (S5-1) - Body ground
Always
10 kΩ or higher
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| OK | ||
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