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Fig. 61: Checking Continuity Between Terminals Of Pressure Switch Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

2004 ACCESSORIES & EQUIPMENT Air Conditioning System - Diagnostics - Sequoia

The continuity changes with refrigerant pressure as shown below.

Low Pressure Cut Side

Reference : High Pressure Cut Side

ON (continuity)

ON (continuity)

1 f 211 kPa 196 kPa t I

[ j 3,140 kPa

OFF (continuity)

OFF (continuity)

G02922209

G02922209

Fig. 62: Continuity Changes With Refrigerant Pressure Table Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

NG: Replace pressure switch. OK: Go to next step.

3. Check harness and connector between pressure switch and integration control and panel (See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE ).

NG: Repair or replace harness or connector.

OK: Check and replace integration control and panel.

DTC 31: FRONT AIR MIX DAMPER POSITION SENSOR CIRCUIT

CIRCUIT DESCRIPTION

This sensor detects the position of the air mix damper and sends the appropriate signals to the integration control and panel.

The position sensor is built into the air mix damper control servomotor assembly.

2004 ACCESSORIES & EQUIPMENT Air Conditioning System - Diagnostics - Sequoia

Toyota Possession Graph
Fig. 63: TP Terminal Voltage Measuring Graph Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

DTC No

Detection Item

Trouble Area

31

Short to ground or power source circuit in front air mix damper position sensor circuit.

• Front air mix damper position sensor

• Harness or connector between front air mix damper position sensor and integration control and panel

• Integration control and panel

Fig. 64: DTC Table

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

WIRING DIAGRAM

2004 ACCESSORIES & EQUIPMENT Air Conditioning System - Diagnostics - Sequoia

Air Mix Damper Sensor For Sienna
Fig. 65: Wiring Diagram - Front Air Mix Damper Position Sensor Circuit Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

INSPECTION PROCEDURE

1. Check voltage between terminals TPD and SG of integration control and panel. PREPARATION:

Remove integration control and panel with connectors still connected. CHECK:

a. Turn ignition switch to ON.

b. Change the set temperature to activate the front air mix damper control servomotor, and measure the voltage between terminals TPD and SG of integration control and panel connector each time when the set temperature is changed.

2004 ACCESSORIES & EQUIPMENT Air Conditioning System - Diagnostics - Sequoia

Fig. 66: Measuring Voltage Between Terminals TPD And SG Of Integration Control And Panel Connector

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. OK:

Fig. 66: Measuring Voltage Between Terminals TPD And SG Of Integration Control And Panel Connector

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. OK:

TEMPERATURE AND VO

Set Temperature

Voltage

Max. cool

3.5 - 4.5 V

Max. hot

NOTE:

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