2005 INFINITI QX4 Factory Service Manual

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Page 457 of 3419

INFINITI QX4 2005 Factory Service Manual ATC-62 TROUBLE DIAGNOSIS Revision: October 20052005 QX56 COMPONENT DESCRIPTION Front Air Control The front air control has a built-in microcomputer which processes information sent from various sensor

Page 458 of 3419

INFINITI QX4 2005 Factory Service Manual TROUBLE DIAGNOSIS ATC-63 C D E F G H I K L MA B AT C Revision: October 20052005 QX56 1. CHECK POWER SUPPLY CIRCUITS FOR FRONT AIR CONTROL 1. Disconnect front air control connector. 2. Check voltage be

Page 459 of 3419

INFINITI QX4 2005 Factory Service Manual ATC-64 TROUBLE DIAGNOSIS Revision: October 20052005 QX56 Mode Door Motor CircuitEJS003XO SYMPTOM: Air outlet does not change. Mode door motor does not operate normally. INSPECTION FLOW *1AT C - 2 9

Page 460 of 3419

INFINITI QX4 2005 Factory Service Manual TROUBLE DIAGNOSIS ATC-65 C D E F G H I K L MA B AT C Revision: October 20052005 QX56 SYSTEM DESCRIPTION Component Parts Mode door control system components are: Front air control Mode door motor PB

Page 461 of 3419

INFINITI QX4 2005 Factory Service Manual ATC-66 TROUBLE DIAGNOSIS Revision: October 20052005 QX56 COMPONENT DESCRIPTION Mode Door Motor The mode door motor is attached to the heater & cooling unit. It rotates so that air is discharged from t

Page 462 of 3419

INFINITI QX4 2005 Factory Service Manual TROUBLE DIAGNOSIS ATC-67 C D E F G H I K L MA B AT C Revision: October 20052005 QX56 3. CHECK FRONT AIR CONTROL FOR GROUND AND POWER 1. Press the mode switch to the D/F ( ) mode. 2. Check voltage bet

Page 463 of 3419

INFINITI QX4 2005 Factory Service Manual ATC-68 TROUBLE DIAGNOSIS Revision: October 20052005 QX56 7. CHECK PBR REFERENCE VOLTAGE CIRCUIT FOR SHORT TO GROUND 1. Turn ignition switch OFF. 2. Disconnect the front air control harness connector.

Page 464 of 3419

INFINITI QX4 2005 Factory Service Manual TROUBLE DIAGNOSIS ATC-69 C D E F G H I K L MA B AT C Revision: October 20052005 QX56 11 . CHECK PBR FEEDBACK SIGNAL CIRCUIT FOR SHORT TO GROUND 1. Turn ignition switch OFF. 2. Disconnect front air co
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