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TROUBLE DIAGNOSIS MTC-39 C D E F G H I K L M A B MTC 2007 Pathfinder Operational Check EJS004RL The purpose of the operational check is to confirm that the system operates properly. CHECKING BLOWER 1. Turn blower control dial clockwise. Blower should operate on low speed. 2. Turn the blower control dial again, and continue checking each blower speed until all speeds are checked. 3. Leave blower on speed 4. If NG, go to trouble diagnosis procedure for MTC-56, "Front Blower Motor Circuit" If OK, continue with next check. CHECKING DISCHARGE AIR 1. Turn the mode switch to each position. 2. Confirm that discharge air comes out according to the air distribution table. Refer to Mode door position is checked in the next step. MTC-43, "Mode Door Motor Circuit" If OK, continue with next check. NOTE: ) or D/F ( ) is selected. CHECKING RECIRCULATION 1. Press recirculation ( ) switch one time. Recirculation indicator should illuminate. 2. Press recirculation ( ) switch one more time. Recirculation indicator should go off. 3. Listen for intake door position change (blower sound should change slightly). If NG, go to trouble diagnosis procedure for MTC-52, "Intake Door Motor Circuit" If OK, continue with next check. NOTE: CHECKING TEMPERATURE DECREASE 1. Rotate temperature control dial counterclockwise. 2. Check for cold air at appropriate discharge air outlets. If NG, listen for sound of air mix door motor operation if OK, go to trouble diagnosis procedure for . If air mix door motor appears to be malfunctioning, go to CEDURE FOR AIR MIX DOOR MOTOR (FRONT)" . If OK, continue with next check. CHECKING TEMPERATURE INCREASE 1. Rotate temperature control dial clockwise. 2. Check for hot air at appropriate discharge air outlets. If NG, listen for sound of air mix door motor operation. If OK, go to trouble diagnosis procedure for . If air mix door motor (front) appears to be malfunctioning, go to PROCEDURE FOR AIR MIX DOOR MOTOR (FRONT)" If OK, continue with next check. CHECK A/C SWITCH 1. Press A/C switch with the blower switch ON. 2. A/C switch indicator will turn ON. ● Confirm that the compressor clutch engages (sound or visual inspection). If NG, go to trouble diagnosis procedure for MTC-64, "Magnet Clutch Circuit" If OK, continue with next check. Conditions : Engine running and at normal operating temperature |