2008 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 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 CAN COMMUNICATION SYSTEM ...................21 System Description ................................................ 21 DIAGNOSIS SYSTEM (ECM) ............................22 CONSULT-III Function ........................................... 22 SELF-DIAGNOSIS FUNCTION .........................23 Diagnosis Description ............................................ 23 Auxiliary Mechanism Trimmers .............................. 28 COMPONENT DIAGNOSIS ........................ 29 LAN SYSTEM CIRCUIT ....................................29 Description ............................................................. 29 Diagnosis Procedure .............................................. 29 MODE DOOR MOTOR ...................................... 32 Description ..............................................................32 Diagnosis Procedure ..............................................33 AIR MIX DOOR MOTOR ................................... 35 Description ..............................................................35 Diagnosis Procedure ..............................................36 INTAKE DOOR MOTOR ................................... 38 Description ..............................................................38 Diagnosis Procedure ..............................................39 BLOWER MOTOR ............................................ 41 Description ..............................................................41 Component Function Check ...................................42 Diagnosis Procedure ..............................................43 MAGNET CLUTCH ........................................... 47 Description ..............................................................47 Component Function Check ...................................47 Diagnosis Procedure ..............................................48 AMBIENT SENSOR .......................................... 51 Description ..............................................................51 Diagnosis Procedure ..............................................51 Component Inspection & Special Repair Require- ment ........................................................................52 IN-VEHICLE SENSOR ...................................... 54 Component Description ..........................................54 Diagnosis Procedure ..............................................54 Component Inspection & Special Repair Require- ment ........................................................................56 SUNLOAD SENSOR ......................................... 57 Description ..............................................................57 Diagnosis Procedure ..............................................57 Component Inspection & Special Repair Require- ment ........................................................................58 INTAKE SENSOR ............................................. 60 Description ..............................................................60

HAC-2 Component Function Check .................................. 60 Diagnosis Procedure ............................................. 60 POWER SUPPLY AND GROUND CIRCUIT FOR FRONT AIR CONTROL ........................... 62 Description ............................................................. 62 Component Function Check .................................. 62 Diagnosis Procedure ............................................. 62 ECU DIAGNOSIS ....................................... 64 AIR CONDITIONER CONTROL ....................... 64 Reference Value .................................................... 64 Wiring Diagram - Air Conditioner Control (Auto) - Coupe .................................................................... 66 Wiring Diagram - Air Conditioner Control (Auto) - Sedan .................................................................... 75 SYMPTOM DIAGNOSIS ............................ 83 AIR CONDITIONER CONTROL ....................... 83 Symptom Matrix Chart ......................................... 83 INSUFFICIENT COOLING ................................ 84 Description ............................................................. 84 Component Function Check .................................. 84 Diagnostic Work Sheet .......................................... 85 Inspection Procedure ............................................. 88 INSUFFICIENT HEATING ................................ 92 Description ............................................................. 92 Component Function Check .................................. 92 NOISE ............................................................... 94 Description ............................................................. 94 Component Function Check .................................. 94 SELF-DIAGNOSIS CANNOT BE PER- FORMED ........................................................... 96 Description ............................................................. 96 Diagnosis Procedure ............................................. 96 MEMORY FUNCTION DOES NOT OPERATE ... 97 Description ............................................................. 97 Diagnosis Procedure ............................................. 97 PRECAUTION ............................................ 98 PRECAUTIONS ................................................ 98 Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT PRE-TENSIONER" ................... 98 Precaution Necessary for Steering Wheel Rota- tion after Battery Disconnect ................................. 98 Working with HFC-134a (R-134a) ......................... 98 Precaution for Service Equipment ......................... 99 MANUAL AIR CONDITIONER BASIC INSPECTION ................................. 101 DIAGNOSIS AND REPAIR WORKFLOW ...... 101 Work Flow ............................................................. 101 INSPECTION AND ADJUSTMENT ................. 102 Description & Conditions ...................................... 102 Inspection Procedure ........................................... 102 FUNCTION DIAGNOSIS ........................... 104 FUNCTION INFORMATION ............................ 104 Component Part Location .................................... 104 Component’s Role ............................................... 106 AIR CONDITIONER CONTROL ...................... 107 System Diagram .................................................. 107 System Description .............................................. 107 Component Part Location .................................... 113 Component Description ....................................... 113 CAN COMMUNICATION SYSTEM ................. 114 System Description .............................................. 114 DIAGNOSIS SYSTEM (ECM) .......................... 115 CONSULT-III Function ......................................... 115 COMPONENT DIAGNOSIS ...................... 116 LAN SYSTEM CIRCUIT .................................. 116 Description ........................................................... 116 Diagnosis Procedure ............................................ 116 MODE DOOR MOTOR .................................... 119 Description ........................................................... 119 Diagnosis Procedure ............................................ 120 AIR MIX DOOR MOTOR ................................. 122 Description ........................................................... 122 Diagnosis Procedure ............................................ 123 INTAKE DOOR MOTOR .................................. 125 Description ........................................................... 125 Diagnosis Procedure ............................................ 125 BLOWER MOTOR ........................................... 127 Description ........................................................... 127 Component Function Check ................................ 127 Diagnosis Procedure ............................................ 128 MAGNET CLUTCH .......................................... 132 Component Function Check ................................ 132 Diagnosis Procedure ............................................ 132 POWER SUPPLY AND GROUND CIRCUIT FOR FRONT AIR CONTROL .......................... 136 Description ........................................................... 136 Component Function Check ................................ 136 Diagnosis Procedure ............................................ 136 ECU DIAGNOSIS ...................................... 138 AIR CONDITIONER CONTROL ...................... 138 Reference Value .................................................. 138 Wiring Diagram - Air Conditioner Control (Manual) - Coupe ................................................................ 140

HAC-3 C D E F G H J K L M A B HAC N O P Wiring Diagram - Air Conditioner Control (Manual) - Sedan ................................................................. 148 Wiring Diagram - Heater Control - Sedan Only .... 156 Wiring Diagram - Heater Control - Sedan ............ 159 SYMPTOM DIAGNOSIS ........................... 160 AIR CONDITIONER CONTROL ...................... 160 Symptom Matrix Chart ........................................ 160 INSUFFICIENT COOLING .............................. 161 Description ........................................................... 161 Component Function Check ................................. 161 Diagnostic Work Sheet ......................................... 162 Inspection Procedure ........................................... 165 INSUFFICIENT HEATING ............................... 169 Description ............................................................ 169 Component Function Check ................................. 169 NOISE .............................................................. 171 Description ............................................................ 171 Component Function Check ................................. 171 PRECAUTION ........................................... 173 PRECAUTIONS ............................................... 173 Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT PRE-TENSIONER" .................. 173 Precaution Necessary for Steering Wheel Rota- tion after Battery Disconnect ................................ 173 Working with HFC-134a (R-134a) ........................ 173 Precaution for Service Equipment ........................ 174

HAC-4 < BASIC INSPECTION > [AUTOMATIC AIR CONDITIONER] DIAGNOSIS AND REPAIR WORKFLOW BASIC INSPECTION DIAGNOSIS AND REPAIR WORKFLOW Work Flow INFOID:0000000001345238 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-83, " Symptom Matrix Chart " below. >> 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 >> CHECK OUT NO >> GO TO 3

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:0000000001345239 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:0000000001728328 INSPECTION PROCEDURE: 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-43, " 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-33, " 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-36, " Diagnosis Procedure " . If OK, continue with next check. STEP 4: Check Temperature Decrease 1. Turn the temperature dial counterclockwise to 16°C ("60°). 2. Check for cold air at discharge air outlets. If NG, go to HAC-84, " 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-92, " Component Function Check " . If OK, continue with next check. STEP 6: Check AUTO Mode 1. Press the AUTO switch.

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2008 Nissan Altima Service & Repair Manual

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