Air Inlet Damper Control Servo Motor Circuit (B1442/42)
This No. 1 air conditioning servo assembly (fresh/recirculation damper) is controlled by the air conditioning amplifier assembly and moves the air inlet damper to the desired position.
DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
B1442/42 |
Air inlet damper position sensor value does not change even if air conditioning amplifier assembly operates air inlet damper servo motor. |
|
PROCEDURE
READ VALUE USING TECHSTREAM
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Operate the recirculation/fresh switch.
(e) Enter the following menus: Body Electrical / Air Conditioner / Data List.
(f) Check the value(s) by referring to the table below.
Air ConditionerTester Display | Measurement Item/Range | Normal Condition | Diagnostic Note |
|---|---|---|---|
Air Inlet Damper Position |
Air inlet damper servo motor actual position / Air inlet damper servo motor actual position / Min.: -14.0% Max.: 113.5% |
FRESH: 0.0% RECIRCULATION: 100.0% |
- |
Air Inlet Damper Target |
Air inlet damper servo motor target position / Min.: -14.0% Max.: 113.5% |
FRESH: 0.0% RECIRCULATION: 100.0% |
- |
OK:
The display is as specified in the Normal Condition column.
Result | Proceed to |
|---|---|
NG |
A |
OK (When troubleshooting according to Problem Symptoms Table) |
B |
OK (When troubleshooting according to the DTC) |
C |
| B | .gif) |
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
| C | |
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY |
|
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INSPECT NO. 1 AIR CONDITIONING SERVO ASSEMBLY (FRESH/RECIRCULATION DAMPER)
(a) Remove the No. 1 air conditioning servo assembly (fresh/recirculation damper) (See page .gif)
).
(b) Inspect the No. 1 air conditioning servo assembly (fresh/recirculation damper) (See page ).
| NG | |
REPLACE NO. 1 AIR CONDITIONING SERVO ASSEMBLY (FRESH/RECIRCULATION DAMPER) |
|
CHECK HARNESS AND CONNECTOR (NO. 1 AIR CONDITIONING SERVO ASSEMBLY - AIR CONDITIONING AMPLIFIER ASSEMBLY)
(a) Disconnect the D29 No. 1 air conditioning servo assembly (fresh/recirculation damper).
(b) Disconnect the A35 air conditioning amplifier assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection | Condition | Specified Condition |
|---|---|---|
D29-6 (MREC) - A35-26 (AIR) |
Always |
Below 1 Ω |
D29-7 (MFRS) - A35-25 (AIF) |
Always |
Below 1 Ω |
D29-6 (MREC) or A35-26 (AIR) - Body ground |
Always |
10 kΩ or higher |
D29-7 (MFRS) or A35-25 (AIF) - Body ground |
Always |
10 kΩ or higher |
| OK | |
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY |
| NG | |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
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