(4) If the wiring is correct:

 - do a check of the resistance between the IDG1 disconnect solenoid and disconnect switch: between the pins A/12 and A/13 for the solenoid (normal resistance = 5 ohms plus or minus 2.5 ohms at 25.C) between the pins A/14 and A/13 of the switch (open circuit when the IDG is not disconnected, and closed circuit when the IDG is disconnected).
 (a) If the IDG1 disconnect solenoid and/or switch is(are) defective:
 - replace the IDG (4000XU) (Ref. AMM TASK 24-21-51-000-040) and (Ref. AMM TASK 24-21-51-400-040).
 B. Do the Functional Test of the IDG disconnect system-engine in operation (Ref. AMM TASK 24-21-00-720-041).
 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1R EFF : 001-049, 051-099, 101-149, 151-199, ∞∞24-20-00∞∞∞∞∞∞∞∞∞∞Page A231
 201-299, 301-399, Aug 01/05 CES

 TASK 24-20-00-810-852

 Failure of the IDG2 Disconnect Circuit
 1. Possible Causes
_______________
 - GCU-2 (1XU2)

 - IDG (4000XU)

 - RELAY-IDG2 DISC CTL (4XT)

 - RELAY-FUNCTION (8XT)

 - IDG2 disconnect wiring

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------
REFERENCE DESIGNATION
 -------------------------------------------------------------------------------
AMM 24-21-00-720-041 Operational Test of the IDG Disconnect and Reconnect (Reset) Function - Engine in Operation AMM 24-21-51-000-040 Removal of the Integrated Drive Generator -IDG 1(2),(4000XU) AMM 24-21-51-400-040 Installation of the Integrated Drive Generator -IDG
 1(2),(4000XU)
 AMM 24-22-34-000-001 Removal of the GCU-1(2) (1XU1, 1XU2)
 AMM 24-22-34-400-001 Installation of the GCU-1(2) (1XU1, 1XU2)
 ASM 24-21/01

 3. Fault Confirmation
__________________
 A. Test
 Not applicable, you cannot confirm this fault on the ground.

 4. Fault Isolation
_______________
 A. If the fault symptom is identified by the CFDS message: CHECK IDG2 DISCONNECT CKT and by the warnings IDG2 OIL LO PR and IDG2 OIL OVHT on the upper ECAM display unit:
 - replace the GCU-2 (1XU2) (Ref. AMM TASK 24-22-34-000-001) and (Ref. AMM TASK 24-22-34-400-001).
 (1) If the fault continues:

 - replace the RELAY-IDG2 DISC CTL (4XT).

 (2) If the fault continues:

 - replace the RELAY-FUNCTION (8XT).
 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1R EFF : 001-049, 051-099, 101-149, 151-199, ∞∞24-20-00∞∞∞∞∞∞∞∞∞∞Page A232
 201-299, 301-399, Aug 01/05 CES

 (3) If the fault continues:

 - do a check of the IDG2 disconnect wiring between: the pin 2 of the circuit breaker (2XT) and the pin B3 of the ELEC/IDG2 pushbutton switch (6XT) the pin 2 of the circuit breaker (2XT) and the pin A2 of the relay (4XT) the pin B1 of the ELEC/IDG2 pushbutton switch (6XT) and the pin X1 of the relay (8XT) the pin A1 of the relay (4XT) and successively the pin A/3B of the GCU2 (1XU2) and the pin A/12 of the IDG2 (4000XU) the pins B2 and X2 of the relay (4XT) and the ground the pin A/13 of the IDG2 (4000XU) and the ground the pin A/14 of the IDG2 (4000XU) and the pin A/6B of the EGIU2 (22XU2) the pin B1 of the relay (4XT) and the pin A/4B of the EGIU2 (22XU2) (Ref. ASM 24-21/01).
 (a) If the wiring is not correct:
 - repair it.

 (4) If the wiring is correct:

 - do a check of the resistance between the IDG2 disconnect solenoid and disconnect switch: between the pins A/12 and A/13 of the solenoid (normal resistance = 5 ohms plus or minus 2.5 ohms at 25.C) between the pins A/14 and A/13 of the switch (open circuit when the IDG is not disconnected, and closed circuit when the IDG is disconnected).
 (a) If the IDG2 disconnect solenoid and/or switch is(are) defective:
 - replace the IDG (4000XU) (Ref. AMM TASK 24-21-51-000-040) and (Ref. AMM TASK 24-21-51-400-040).
 B. Do the Functional Test of the IDG disconnect system-engine in operation (Ref. AMM TASK 24-21-00-720-041).
 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1R EFF : 001-049, 051-099, 101-149, 151-199, ∞∞24-20-00∞∞∞∞∞∞∞∞∞∞Page A233
 201-299, 301-399, Aug 01/05 CES

 TASK 24-20-00-810-853