Toyota Tacoma (2015-2018) Service Manual: Air Mix Damper Position Sensor Circuit (Passenger Side) (B1431/31)

Toyota Tacoma (2015-2018) Service Manual / Air Conditioning / Air Conditioning System(for Automatic Air Conditioning System) / Air Mix Damper Position Sensor Circuit (Passenger Side) (B1431/31)

DESCRIPTION

This sensor detects the position of the air mix damper (for front passenger side) and sends the appropriate signals to the air conditioning amplifier assembly. The position sensor is built into the No. 2 air conditioning radiator damper servo sub-assembly (for front passenger side air mix).

DTC No.	DTC Detection Condition	Trouble Area
B1431/31	Short to ground or power source circuit air mix damper position sensor (for front passenger side) circuit.	No. 2 air conditioning radiator damper servo sub-assembly (for front passenger side air mix) Harness or connector Air conditioning amplifier assembly

WIRING DIAGRAM

PROCEDURE

1.	READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(d) Operate the front passenger side temperature switch.

(e) Enter the following menus: Body Electrical / Air Conditioner / Data List.

(f) Check the value(s) by referring to the table below.

Air Conditioner

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
Air Mix Damper Position (Passenger Side)	Air mix damper servo motor (for front passenger side) actual position / Min.: -14.0% Max.: 113.5%	MAX COOL: 0.0% MAX HOT: 100.0%	-
Air Mix Damper Target (Passenger Side)	Air mix damper servo motor (for front passenger side) target position / Min.: -14.0% Max.: 113.5%	MAX COOL: 0.0% MAX HOT: 100.0%	-

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

Air Mix Damper Position (Passenger Side)

Air mix damper servo motor (for front passenger side) actual position /

Min.: -14.0%

Max.: 113.5%

MAX COOL: 0.0%

MAX HOT: 100.0%

Air Mix Damper Target (Passenger Side)

Air mix damper servo motor (for front passenger side) target position /

Min.: -14.0%

Max.: 113.5%

MAX COOL: 0.0%

MAX HOT: 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

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

2.	INSPECT NO. 2 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (FOR FRONT PASSENGER SIDE AIR MIX)

(a) Remove the No. 2 air conditioning radiator damper servo sub-assembly (for front passenger side air mix) (See page (b) Inspect the No. 2 air conditioning radiator damper servo sub-assembly (for ).

(b) Inspect the No. 2 air conditioning radiator damper servo sub-assembly (for front passenger side air mix) (See page ).

REPLACE NO. 2 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (FOR FRONT PASSENGER SIDE AIR MIX)

3.	CHECK HARNESS AND CONNECTOR (NO. 2 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY - AIR CONDITIONING AMPLIFIER ASSEMBLY)

(a) Disconnect the D31 No. 2 air conditioning radiator damper servo sub-assembly (for front passenger side air mix) connector.

(b) Disconnect the A35 and A36 air conditioning amplifier assembly connectors.

Standard Resistance:

Tester Connection	Condition	Specified Condition
D31-1 (SG) - A36-29 (S5-4)	Always	Below 1 Ω
D31-2 (TPP) - A35-4 (TPR)	Always	Below 1 Ω
D31-3 (S5) - A35-18 (SG-5)	Always	Below 1 Ω
D31-1 (SG) or A36-29 (S5-4) - Body ground	Always	10 kΩ or higher
D31-2 (TPP) or A35-4 (TPR) - Body ground	Always	10 kΩ or higher
D31-3 (S5) or A35-18 (SG-5) - Body ground	Always	10 kΩ or higher

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR

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