NOTE As the air inlet servomotor moves from REC side to FRS side the resistance decreases

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NG: Replace air inlet damper servomotor. OK: Go to next step.

3. Check harness and connectors between air inlet damper position sensor 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 37: WATER VALVE 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 water valve damper control servomotor assembly.

2004 ACCESSORIES & EQUIPMENT Air Conditioning System - Diagnostics - Sequoia

Fig. 73: TP Terminal Voltage & Damper Opening Angle Graph Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

DTC No

Detection Item

Trouble Area

37

Short to ground or power source circuit in water valve damper position sensor circuit

• Water vatve damper position sensor

• Harness or connector between water valve damper position sensor and integration control and panel

• Integration control and panel

Fig. 74: DTC Table

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

WIRING DIAGRAM

2004 ACCESSORIES & EQUIPMENT Air Conditioning System - Diagnostics - Sequoia

2004 Toyota Maf Wire Diagram
Fig. 75: Wiring Diagram - Water Value Damper Position Sensor Circuit Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

INSPECTION PROCEDURE

1. Check voltage between terminals TPH 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 water valve servomotor and measure the voltage between terminals TPH and SG of integration control and panel connector each time when the set temperature is changed.

TEMPERATURE AND VO

Set Temperature

Voltage

Max. cool

3.5 - 4.5 V

Max. hot

2004 ACCESSORIES & EQUIPMENT Air Conditioning System - Diagnostics - Sequoia

Fig. 76: Measuring Voltage Between Terminals TPH & SG Of Integration Central & Panel Connector

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. NOTE: As the set temperature increases, the voltage decreases.

Fig. 76: Measuring Voltage Between Terminals TPH & SG Of Integration Central & Panel Connector

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. NOTE: As the set temperature increases, the voltage decreases.

OK: Proceed to next circuit inspection shown on problem symptoms table (See PROBLEM SYMPTOMS TABLE ). However, if DTC 37 or 47 is displayed, check and replace integration control and panel.

2. Check water valve damper position sensor. PREPARATION:

Remove water valve servomotor (See DISASSEMBLY ). CHECK:

Measure resistance between terminals 1 and 2 of water valve servomotor connector. OK:

While operating water valve servomotor, following the procedure, measure resistance between terminals 2 and 3 of water valve servomotor connector.

CONNECTOR POSITION AND RESISTANCE

Position

Resistance

Max. cool

0.8 - 1.6kohm

Max. hot

3 - 5.6 kohm

2004 ACCESSORIES & EQUIPMENT Air Conditioning System - Diagnostics - Sequoia

Fig. 77: Measuring Resistance Between Terminal & Movement From Cool Side To Hot Side Of Water Value Servomotor

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

Fig. 77: Measuring Resistance Between Terminal & Movement From Cool Side To Hot Side Of Water Value Servomotor

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

2004 ACCESSORIES & EQUIPMENT Air Conditioning System - Diagnostics - Sequoia

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