2011 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 Inspection Procedure ............................................... 5 Auxiliary Mechanism Trimmers ................................ 6 SYSTEM DESCRIPTION ............................. 8 FUNCTION INFORMATION ............................... 8 Component Part Location ........................................ 8 Component’s role ................................................... 10 REFRIGERATION SYSTEM .............................12 Refrigerant Cycle ................................................... 12 Refrigerant System Protection ............................... 12 AUTOMATIC AIR CONDITIONER SYSTEM ....13 System Diagram ..................................................... 13 System Description ................................................ 13 Component Part Location ...................................... 19 Component Description .......................................... 19 DIAGNOSIS SYSTEM (BCM) ...........................20 AIR CONDITIONER .................................................. 20 AIR CONDITIONER : CONSULT Function (BCM - AIR CONDITIONER) .............................................. 20 DIAGNOSIS SYSTEM (IPDM E/R) ....................21 Diagnosis Description ............................................ 21 CONSULT Function (IPDM E/R) ............................ 24 SELF-DIAGNOSIS FUNCTION .........................27 Diagnosis Description ............................................ 27 Auxiliary Mechanism Trimmers .............................. 32 DTC/CIRCUIT DIAGNOSIS ........................ 33 LAN SYSTEM CIRCUIT .................................... 33 Description ..............................................................33 Diagnosis Procedure ..............................................33 MODE DOOR MOTOR ...................................... 39 Description ..............................................................39 Diagnosis Procedure ..............................................40 AIR MIX DOOR MOTOR ................................... 41 Description ..............................................................41 Diagnosis Procedure ..............................................42 INTAKE DOOR MOTOR ................................... 44 Description ..............................................................44 Diagnosis Procedure ..............................................45 BLOWER MOTOR ............................................ 46 Description ..............................................................46 Component Function Check ...................................47 Diagnosis Procedure ..............................................47 MAGNET CLUTCH ........................................... 52 Description ..............................................................52 Component Function Check ...................................52 Diagnosis Procedure ..............................................52 AMBIENT SENSOR .......................................... 56 Description ..............................................................56 Diagnosis Procedure ..............................................56 Component Inspection & Special Repair Require- ment ........................................................................58 IN-VEHICLE SENSOR ...................................... 59 Component Description ..........................................59 Diagnosis Procedure ..............................................59 Component Inspection & Special Repair Require- ment ........................................................................61 SUNLOAD SENSOR ......................................... 62 Description ..............................................................62 Diagnosis Procedure ..............................................62 Revision: June 2012 2011 Altima GCC

HAC-2 Component Inspection & Special Repair Require- ment ....................................................................... 64 INTAKE SENSOR ............................................. 65 Description ............................................................. 65 Component Function Check .................................. 65 Diagnosis Procedure ............................................. 65 POWER SUPPLY AND GROUND CIRCUIT FOR FRONT AIR CONTROL ........................... 67 Description ............................................................. 67 Component Function Check .................................. 67 Diagnosis Procedure ............................................. 67 ECU DIAGNOSIS INFORMATION ............. 69 AIR CONDITIONER CONTROL ....................... 69 Reference Value .................................................... 69 WIRING DIAGRAM .................................... 71 AIR CONDITIONER CONTROL ....................... 71 Wiring Diagram - Coupe With Automatic ............... 71 Wiring Diagram - Sedan With Automatic ............... 80 SYMPTOM DIAGNOSIS ............................ 89 AIR CONDITIONER CONTROL ....................... 89 Symptom Matrix Chart ......................................... 89 INSUFFICIENT COOLING ................................ 90 Component Function Check .................................. 90 Diagnostic Work Flow ............................................ 91 Performance Chart ................................................ 94 Trouble Diagnosis For Abnormal Pressure ............ 94 INSUFFICIENT HEATING ................................ 98 Component Function Check .................................. 98 NOISE ............................................................. 100 Component Function Check ................................. 100 SELF-DIAGNOSIS CANNOT BE PER- FORMED ......................................................... 102 Diagnosis Procedure ............................................ 102 MEMORY FUNCTION DOES NOT OPERATE . 103 Diagnosis Procedure ............................................ 103 PRECAUTION ........................................... 104 PRECAUTIONS .............................................. 104 Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT PRE-TEN- SIONER" ............................................................... 104 Precaution Necessary for Steering Wheel Rota- tion After Battery Disconnect ................................ 104 Working with HFC-134a (R-134a) ........................ 105 Precaution for Service Equipment ........................ 105 MANUAL AIR CONDITIONER BASIC INSPECTION ................................. 107 DIAGNOSIS AND REPAIR WORKFLOW ....... 107 Work Flow ............................................................ 107 INSPECTION AND ADJUSTMENT ................. 108 Description and Conditions .................................. 108 Inspection Procedure ........................................... 108 SYSTEM DESCRIPTION .......................... 109 FUNCTION INFORMATION ............................ 109 Component Part Location .................................... 109 Component’s role ................................................. 110 AIR CONDITIONER CONTROL ...................... 112 System Diagram .................................................. 112 System Description .............................................. 112 Component Part Location .................................... 118 Component Description ....................................... 118 DIAGNOSIS SYSTEM (BCM) .......................... 119 AIR CONDITIONER ................................................ 119 AIR CONDITIONER : CONSULT Function (BCM - AIR CONDITIONER) ............................................ 119 DIAGNOSIS SYSTEM (IPDM E/R) .................. 120 Diagnosis Description .......................................... 120 CONSULT Function (IPDM E/R) .......................... 123 DTC/CIRCUIT DIAGNOSIS ....................... 126 LAN SYSTEM CIRCUIT .................................. 126 Description ........................................................... 126 Diagnosis Procedure ............................................ 126 MODE DOOR MOTOR .................................... 131 Description ........................................................... 131 Diagnosis Procedure ............................................ 132 AIR MIX DOOR MOTOR ................................. 133 Description ........................................................... 133 Diagnosis Procedure ............................................ 134 INTAKE DOOR MOTOR .................................. 135 Description ........................................................... 135 Diagnosis Procedure ............................................ 135 BLOWER MOTOR ........................................... 137 Description ........................................................... 137 Component Function Check ................................ 137 Diagnosis Procedure ............................................ 137 MAGNET CLUTCH .......................................... 142 Description ........................................................... 142 Component Function Check ................................ 142 Diagnosis Procedure ............................................ 142 POWER SUPPLY AND GROUND CIRCUIT FOR FRONT AIR CONTROL .......................... 146 Description ........................................................... 146 Component Function Check ................................ 146 Diagnosis Procedure ............................................ 146 Revision: June 2012 2011 Altima GCC

HAC-3 C D E F G H J K L M A B HAC N O P ECU DIAGNOSIS INFORMATION ........... 148 AIR CONDITIONER CONTROL ...................... 148 Reference Value .................................................. 148 WIRING DIAGRAM ................................... 150 AIR CONDITIONER CONTROL ...................... 150 Wiring Diagram - Manual ..................................... 150 SYMPTOM DIAGNOSIS ........................... 158 AIR CONDITIONER CONTROL ...................... 158 Symptom Matrix Chart ........................................ 158 INSUFFICIENT COOLING .............................. 159 Component Function Check ................................. 159 Diagnostic Work Flow .......................................... 160 Performance Chart ............................................... 162 Trouble Diagnosis For Abnormal Pressure .......... 163 INSUFFICIENT HEATING ............................... 167 Description ............................................................ 167 Component Function Check ................................. 167 NOISE .............................................................. 169 Component Function Check ................................. 169 PRECAUTION ........................................... 170 PRECAUTIONS ............................................... 170 Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT PRE-TEN- SIONER" .............................................................. 170 Precaution Necessary for Steering Wheel Rota- tion After Battery Disconnect ................................ 170 Working with HFC-134a (R-134a) ........................ 171 Precaution for Service Equipment ........................ 171 Revision: June 2012 2011 Altima GCC

HAC-4 < BASIC INSPECTION > [AUTOMATIC AIR CONDITIONER] DIAGNOSIS AND REPAIR WORKFLOW BASIC INSPECTION DIAGNOSIS AND REPAIR WORKFLOW Work Flow INFOID:0000000006388961 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-89, "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: June 2012 2011 Altima GCC

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:0000000006388962 DESCRIPTION The purpose of the operational check is to confirm that the system operates properly. CONDITIONS: • Engine running and at normal operation temperature. Inspection Procedure INFOID:0000000006388963 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-47, "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-13, "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-40, "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-42, "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-90, "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-98, "Component Function Check" . If OK, continue with next check. Step 6: Check Auto Mode 1. Press the AUTO switch. 2. Confirm that the compressor clutch engages (audio or visual inspection). (Discharge air and blower speed will depend on ambient, in-vehicle and set temperatures.) If NG, go to HAC-67, "Diagnosis Procedure" , then if necessary, HAC-52, "Component Function Check" . If all operational checks are OK (symptom can not be duplicated), refer to GI-38, "Work Flow" and perform tests as outlined to simulate driving condition environment. If symptom appears, refer to HAC-89, "Symptom Matrix Chart" . Revision: June 2012 2011 Altima GCC

2011 Nissan Altima Service & Repair Manual

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