2002 Crown Victoria/Grand Marquis Workshop Manual

Download Adjust the blower motor setting to LO and then to HI. * Does the blower motor operate correctly? Yes REPAIR circuit 515 (OG/RD) for a short to ground. TEST the system for normal operation. No GO to R2 . R2 CHECK THE BLOWER MOTOR SPEED CONTROL Blower Motor Speed Control C1308 EATC Module C228b * Does the blower motor operate? Yes INSTALL a new blower motor speed control. TEST the system for normal operation. No GO to R3 . R3 CHECK THE BLOWER MOTOR SPEED CONTROL CIRCUITS FOR AN OPEN Blower Motor Speed Control C1308 Measure the resistance between the blower motor speed control C1308: * pin 1, circuit 269 (LB/OG) and the EATC module C228b pin 10. * pin 2, circuit 752 (YE/RD) and the EATC module C228b pin 23. * pin 3, circuit 754 (LG/WH) and the EATC module C228b pin 24. * Are the resistances less than 5 ohms? Yes GO to R4 . No REPAIR the affected circuit. TEST the system for normal operation. R4 CHECK THE BLOWER MOTOR SPEED CONTROL CIRCUITS FOR A SHORT TO VOLTAGE Measure the voltage between the blower motor speed control C1308: * pin 1, circuit 269 (LB/OG) and ground. * pin 2, circuit 752 (YE/RD) and ground. * pin 3, circuit 754 (LG/WH) and ground. * Is voltage present? Yes REPAIR the affected circuit. TEST the system for normal operation. No GO to R5 . R5 CHECK THE BLOWER MOTOR SPEED CONTROL CIRCUITS FOR A SHORT TO GROUND Measure the resistance between the blower motor speed control C1308: * pin 1, circuit 269 (LB/OG) and ground. * pin 2, circuit 752 (YE/RD) and ground. * pin 3, circuit 754 (LG/WH) and ground. * Are the resistances greater than 10,000 ohms? Yes GO to R6 . No REPAIR the affected circuit. TEST the system for normal operation. R6 CHECK THE BLOWER MOTOR SPEED CONTROL CIRCUITS FOR SHORTS Measure the resistance between the blower motor speed control C1308: * pin 2, circuit 752 (YE/RD) and pin 3, circuit 754 (LG/WH). * pin 2, circuit 752 (YE/RD) and pin 1, circuit 269 (LB/OG). * pin 3, circuit 754 (LG/WH) and pin 1, circuit 269 (LB/OG). * Are the resistances greater than 10,000 ohms? Yes GO to R7 . No REPAIR the affected circuits. TEST the system for normal operation. R7 CHECK THE EATC MODULE HIGH BLOWER OUTPUT.