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Contents

Wiring diagrams Section: Manual HVAC System

PRECAUTIONS FOR SUPPLEMENTAL RESTRAINT SYSTEM (SRS) "AIR BAG" AND "SEAT BELT PRE-TENSIONER"

PRECAUTIONS FOR WORKING WITH HFC-134A (R-134A)

CONTAMINATED REFRIGERANT

GENERAL REFRIGERANT PRECAUTIONS

PRECAUTIONS FOR LEAK DETECTION DYE

PRECAUTIONS FOR REFRIGERANT CONNECTION

PRECAUTIONS FOR SERVICING COMPRESSOR

Recovery/Recycling Equipment

Electronic Leak Detector

Vacuum Pump

Manifold Gauge Set

Service Hoses

Service Couplers

Charging Cylinder

SPECIAL SERVICE TOOLS

HFC-134A (R-134A) SERVICE TOOLS AND EQUIPMENT

Refrigerant Flow

Refrigerant Pressure Sensor

Pressure Relief Valve

Lubricant

Checking And Adjusting

Air Mix Door Control

Fan Speed Control

Intake Doors Control

Mode Door Control

Defroster Door Control

Self-Diagnostic System

Display Screen (If Equipped)

Temperature Switch (Temperature Control)

Recirculation (REC) Switch

Off Switch (Blower Speed Set To 0)

A/C Switch

Mode Switch

Front Blower Switch

CONSULT-II

FRONT AIR CONTROL TERMINALS AND REFERENCE VALUE

Checking Blower

Checking Recirculation

Checking Temperature Decrease

Checking Temperature Increase

Check A/C Switch

Front Air Control

Potentio Temperature Control (PTC)

2. CHECK GROUND CIRCUIT FOR FRONT AIR CONTROL

Component Parts

Mode Door Motor

3. CHECK POWER SUPPLY AND GROUND CIRCUITS FOR MODE DOOR MOTOR

4. CHECK PBR REFERENCE SIGNAL VOLTAGE

5. CHECK PBR REFERENCE VOLTAGE CIRCUIT BETWEEN MODE DOOR AND FRONT AIR CONTROL

6. CHECK PBR GROUND REFERENCE CIRCUIT

7. CHECK PBR FEEDBACK SIGNAL

8. CHECK PBR FEEDBACK CIRCUIT

3. CHECK POWER SUPPLY CIRCUITS FOR AIR MIX DOOR MOTOR (FRONT)

5. CHECK PBR REFERENCE VOLTAGE CIRCUIT BETWEEN AIR MIX DOOR MOTOR (FRONT) AND FRONT AIR CONTROL

Defroster Door Motor

5. CHECK PBR REFERENCE VOLTAGE CIRCUIT BETWEEN DEFROSTER DOOR MOTOR AND FRONT AIR CONTROL

6. CHECK PBR REFERENCE VOLTAGE CIRCUIT

Blower Motor Resistor

2. CHECK FUSES

3. CHECK BLOWER MOTOR POWER SUPPLY

4. CHECK BLOWER MOTOR RELAY

5. CHECK BLOWER MOTOR POWER FROM RELAY TO BLOWER MOTOR

6. CHECK BLOWER MOTOR RELAY (COIL SIDE) POWER SUPPLY CIRCUIT

7. CHECK BLOWER MOTOR RELAY (COIL SIDE) GROUND CIRCUIT

9. CHECK BLOWER MOTOR POWER SUPPLY CIRCUIT FOR SHORT

10. CHECK BLOWER MOTOR RELAY (SWITCH SIDE) POWER SUPPLY CIRCUIT

11. CHECK BLOWER MOTOR

12. CHECK BLOWER SWITCH

13. CHECK BLOWER MOTOR RESISTOR

14. CHECK BLOWER SWITCH CIRCUIT

15. CHECK BLOWER MOTOR GROUND CIRCUIT TO BLOWER MOTOR RESISTOR

16. CHECK BLOWER SWITCH

Blower Motor Relay

Blower Motor

Blower Switch

Low Temperature Protection Control

1. CHECK INTAKE SENSOR CIRCUIT

3. CHECK CIRCUIT CONTINUITY BETWEEN IPDM E/R AND COMPRESSOR

4. CHECK MAGNET CLUTCH CIRCUIT

5. CHECK BCM INPUT (COMPRESSOR ON) SIGNAL

6. CHECK CIRCUIT CONTINUITY BETWEEN BCM AND FRONT AIR CONTROL

7. CHECK VOLTAGE FOR FRONT AIR CONTROL (COMPRESSOR ON SIGNAL)

8. CHECK REFRIGERANT PRESSURE SENSOR

9. CHECK BCM INPUT (FAN ON) SIGNAL

10. CHECK CIRCUIT CONTINUITY BETWEEN BCM AND FRONT AIR CONTROL

11. CHECK VOLTAGE FOR FRONT AIR CONTROL (FAN ON SIGNAL)

12. CHECK CAN COMMUNICATION

INSUFFICIENT HEATING

Water Valve

1. CHECK FUSES

2. CHECK WATER VALVE RELAY POWER INPUT CIRCUITS

3. CHECK WATER VALVE POWER OUTPUT CIRCUIT

4. CHECK WATER VALVE RELAY

5. CHECK WATER VALVE GROUND CIRCUIT

6. CHECK WATER VALVE POWER CIRCUITS

7. CHECK WATER VALVE POWER CIRCUITS

Water Valve Relay

Intake Sensor

1. CHECK VOLTAGE BETWEEN INTAKE SENSOR AND GROUND

2. CHECK CIRCUIT CONTINUITY BETWEEN INTAKE SENSOR AND FRONT AIR CONTROL

3. CHECK INTAKE SENSOR

FUNCTION

Clutch Disc

Pulley

Coil

Break-In Operation

CHECKING FOR REFRIGERANT LEAKS

CHECKING SYSTEM FOR LEAKS USING THE FLUORESCENT DYE LEAK DETECTOR

DYE INJECTION

Precautions For Handling Leak Detector

Checking Procedure

COMPRESSOR

REFRIGERANT

ENGINE IDLING SPEED

BELT TENSION

All sections

Intake Sensor Nissan Titan I

Manual HVAC System 1 illustration

Intake Sensor

The intake sensor is located on the heater & cooling unit. It converts temperature of air after it passes through the evaporator into a resistance value which is then input to the front air control.

Scheme 181

Scheme 181: Intake Sensor

Scheme 181: Intake Sensor