Toyota Tacoma manuals

Toyota Tacoma 2015-2018 Service Manual: 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

PROCEDURE

1.

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 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%

-

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

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

C

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

A

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 ).

NG

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

OK

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.

(c) Measure the resistance according to the value(s) in the table below.

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

OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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