2010 Nissan Altima Service & Repair Manual

HAC-1 VENTILATION, HEATER & AIR CONDITIONER C D E F G H J K L M SECTION HAC A B HAC N O P CONTENTS HEATER & AIR CONDITIONING CONTROL SYSTEM AUTOMATIC AIR CONDITIONER BASIC INSPECTION ................................... 4 DIAGNOSIS AND REPAIR WORKFLOW ......... 4 Work Flow ................................................................ 4 INSPECTION AND ADJUSTMENT .................... 5 Description and Conditions ...................................... 5 Operational Check ................................................... 5 Auxiliary Mechanism Trimmers ................................ 6 FUNCTION DIAGNOSIS .............................. 9 FUNCTION INFORMATION ............................... 9 Component Part Location ........................................ 9 Component’s Role .................................................. 11 REFRIGERATION SYSTEM .............................13 Refrigerant Cycle ................................................... 13 Refrigerant System Protection ............................... 13 AUTOMATIC AIR CONDITIONER SYSTEM ....14 System Diagram ..................................................... 14 System Description ................................................ 14 Component Part Location ...................................... 20 Component Description .......................................... 20 DIAGNOSIS SYSTEM (ECM) ............................21 CONSULT-III Function ........................................... 21 SELF-DIAGNOSIS FUNCTION .........................22 Diagnosis Description ............................................ 22 Auxiliary Mechanism Trimmers .............................. 27 COMPONENT DIAGNOSIS ........................ 28 LAN SYSTEM CIRCUIT ....................................28 Description ............................................................. 28 Diagnosis Procedure .............................................. 28 MODE DOOR MOTOR ......................................31 Description ............................................................. 31 Diagnosis Procedure ..............................................32 AIR MIX DOOR MOTOR ................................... 33 Description ..............................................................33 Diagnosis Procedure ..............................................34 INTAKE DOOR MOTOR ................................... 35 Description ..............................................................35 Diagnosis Procedure ..............................................36 BLOWER MOTOR ............................................ 37 Description ..............................................................37 Component Function Check ...................................38 Diagnosis Procedure ..............................................38 MAGNET CLUTCH ........................................... 43 Description ..............................................................43 Component Function Check ...................................43 Diagnosis Procedure ..............................................43 AMBIENT SENSOR .......................................... 47 Description ..............................................................47 Diagnosis Procedure ..............................................47 Component Inspection ............................................48 IN-VEHICLE SENSOR ...................................... 50 Component Description ..........................................50 Diagnosis Procedure ..............................................50 Component Inspection ............................................52 SUNLOAD SENSOR ......................................... 53 Description ..............................................................53 Diagnosis Procedure ..............................................53 Component Inspection ............................................55 INTAKE SENSOR ............................................. 56 Description ..............................................................56 Diagnosis Procedure ..............................................56 Component Inspection ............................................57 POWER SUPPLY AND GROUND CIRCUIT FOR FRONT AIR CONTROL ............................ 58 Description ..............................................................58 Revision: September 2009 2010 Altima

HAC-2 Component Function Check .................................. 58 Diagnosis Procedure ............................................. 58 ECU DIAGNOSIS ....................................... 60 AIR CONDITIONER CONTROL ....................... 60 Reference Value .................................................... 60 WIRING DIAGRAM .................................... 62 AIR CONDITIONER CONTROL ....................... 62 COUPE ..................................................................... 62 COUPE : Wiring Diagram - Air Conditioner Control (Auto) - Coupe ....................................................... 62 SEDAN ..................................................................... 71 SEDAN : Wiring Diagram - Air Conditioner Control (Auto) - Sedan ....................................................... 72 SYMPTOM DIAGNOSIS ............................ 82 AIR CONDITIONER CONTROL ....................... 82 Symptom Matrix Chart ......................................... 82 INSUFFICIENT COOLING ................................ 83 Component Function Check .................................. 83 Diagnostic Work Flow ............................................ 84 Performance Chart ................................................ 86 Trouble Diagnosis For Abnormal Pressure ............ 87 INSUFFICIENT HEATING ................................ 91 Component Function Check .................................. 91 NOISE ............................................................... 93 Component Function Check .................................. 93 SELF-DIAGNOSIS CANNOT BE PER- FORMED ........................................................... 95 Diagnosis Procedure ............................................. 95 MEMORY FUNCTION DOES NOT OPERATE ... 96 Diagnosis Procedure ............................................. 96 PRECAUTION ............................................ 97 PRECAUTIONS ................................................ 97 Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT PRE-TEN- SIONER" ................................................................ 97 Working with HFC-134a (R-134a) ......................... 97 Precaution for Service Equipment ......................... 98 MANUAL AIR CONDITIONER BASIC INSPECTION .................................. 99 DIAGNOSIS AND REPAIR WORKFLOW ........ 99 Work Flow .............................................................. 99 INSPECTION AND ADJUSTMENT ................ 100 Description & Conditions ...................................... 100 Operational Check ................................................ 100 FUNCTION DIAGNOSIS ........................... 102 FUNCTION INFORMATION ............................ 102 Component Part Location .................................... 102 Component’s Role ............................................... 104 AIR CONDITIONER CONTROL ...................... 105 System Diagram .................................................. 105 System Description .............................................. 105 Component Part Location .................................... 111 Component Description ....................................... 111 DIAGNOSIS SYSTEM (ECM) .......................... 112 CONSULT-III Function ......................................... 112 COMPONENT DIAGNOSIS ...................... 113 LAN SYSTEM CIRCUIT .................................. 113 Description ........................................................... 113 Diagnosis Procedure ............................................ 113 MODE DOOR MOTOR .................................... 116 Description ........................................................... 116 Diagnosis Procedure ............................................ 117 AIR MIX DOOR MOTOR ................................. 118 Description ........................................................... 118 Diagnosis Procedure ............................................ 119 INTAKE DOOR MOTOR .................................. 120 Description ........................................................... 120 Diagnosis Procedure ............................................ 120 BLOWER MOTOR ........................................... 122 Description ........................................................... 122 Component Function Check ................................ 122 Diagnosis Procedure ............................................ 122 MAGNET CLUTCH .......................................... 127 Component Function Check ................................ 127 Diagnosis Procedure ............................................ 127 POWER SUPPLY AND GROUND CIRCUIT FOR FRONT AIR CONTROL .......................... 130 Description ........................................................... 130 Component Function Check ................................ 130 Diagnosis Procedure ............................................ 130 ECU DIAGNOSIS ...................................... 132 AIR CONDITIONER CONTROL ...................... 132 Reference Value .................................................. 132 WIRING DIAGRAM ................................... 134 AIR CONDITIONER CONTROL ...................... 134 COUPE ................................................................... 134 COUPE : Wiring Diagram - Air Conditioner Control (Manual) - Coupe ................................................. 134 SEDAN ................................................................... 141 Revision: September 2009 2010 Altima

HAC-3 C D E F G H J K L M A B HAC N O P SEDAN : Wiring Diagram - Air Conditioner Control (Manual) - Sedan ................................................. 142 SYMPTOM DIAGNOSIS ........................... 150 AIR CONDITIONER CONTROL ...................... 150 Symptom Matrix Chart ........................................ 150 INSUFFICIENT COOLING .............................. 151 Component Function Check ................................. 151 Diagnostic Work Flow .......................................... 152 Performance Chart ............................................... 154 Trouble Diagnosis For Abnormal Pressure .......... 155 INSUFFICIENT HEATING ............................... 159 Component Function Check ................................. 159 NOISE .............................................................. 161 Component Function Check ................................. 161 PRECAUTION ........................................... 163 PRECAUTIONS ............................................... 163 Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT PRE-TEN- SIONER" .............................................................. 163 Working with HFC-134a (R-134a) ........................ 163 Precaution for Service Equipment ........................ 164 Revision: September 2009 2010 Altima

HAC-4 < BASIC INSPECTION > [AUTOMATIC AIR CONDITIONER] DIAGNOSIS AND REPAIR WORKFLOW BASIC INSPECTION DIAGNOSIS AND REPAIR WORKFLOW Work Flow INFOID:0000000005432601 DETAILED FLOW 1.LISTEN TO CUSTOMER COMPLAINT Listen to customer complaint. Get detailed information about the conditions and environment when the symptom occurs. >> GO TO 2 2.VERIFY THE SYMPTOM WITH OPERATIONAL CHECK Verify the symptom with operational check. Refer to HAC-5, "Description and Conditions" . >> GO TO 3 3.GO TO APPROPRIATE TROUBLE DIAGNOSIS Go to appropriate trouble diagnosis. Refer to HAC-82, "Symptom Matrix Chart" . >> GO TO 4 4.REPAIR OR REPLACE Repair or replace the specific parts. >> GO TO 5 5.FINAL CHECK Final check. Is the inspection result normal? YES >> Inspection End. NO >> GO TO 3 Revision: September 2009 2010 Altima

INSPECTION AND ADJUSTMENT HAC-5 < BASIC INSPECTION > [AUTOMATIC AIR CONDITIONER] C D E F G H J K L M A B HAC N O P INSPECTION AND ADJUSTMENT Description and Conditions INFOID:0000000005432602 DESCRIPTION The purpose of the operational check is to confirm that the system operates properly. CONDITIONS: • Engine running and at normal operation temperature. Operational Check INFOID:0000000005432603 STEP 1: Check Blower 1. Turn blower control dial clockwise, blower should operate on low speed. 2. Continue turning blower control dial clockwise, and continue checking blower speeds until all speeds are checked. 3. Leave blower on HI speed. If NG, go to HAC-38, "Diagnosis Procedure" . If OK, continue with next check. STEP 2: Check Discharge Air 1. Press each mode switch and press DEF ( ) switch. 2. Each mode position indicator should illuminate. 3. Confirm that discharge air comes out according to the air distribution table. Refer to HAC-14, "System Description" . NOTE: Confirm that the compressor clutch is engaged (audio or visual inspection) and intake door is in the FRE ( ) position when the DEF ( ) is selected. Intake door position is checked in the next step. If NG, go to HAC-32, "Diagnosis Procedure" . If OK, continue with next check. STEP 3: Check Recirculation 1. Press REC ( ) switch. Recirculation indicator should illuminate. 2. Press REC ( ) switch a second time. 3. Listen for intake door position change (you should hear blower sound change slightly). If NG, go to HAC-34, "Diagnosis Procedure" . If OK, continue with next check. STEP 4: Check Temperature Decrease 1. Turn the temperature dial counterclockwise to 18°C (60F°). 2. Check for cold air at discharge air outlets. If NG, go to HAC-83, "Component Function Check" . If OK, continue with next check. STEP 5: Check Temperature Increase 1. Turn the temperature dial clockwise to 32°C (90°F). 2. Check for hot air at discharge air outlets. If NG, go to HAC-91, "Component Function Check" . If OK, continue with next check. STEP 6: Check AUTO Mode 1. Press the AUTO switch. Revision: September 2009 2010 Altima

2010 Nissan Altima Service & Repair Manual

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