4. Fault Isolation
_______________
 CAUTION : BEFORE YOU START THE CHECK OF IDG WIRING THAT INCLUDES CONNECTORS,
_______ EXAMINE EACH CONNECTOR TO MAKE SURE THAT THERE IS NO OIL IN IT. IF YOU FIND OIL, CLEAN THE CONNECTOR AND CONNECT IT AGAIN. IF THE FAILURE CONTINUES, DO THE TROUBLE SHOOTING PROCEDURE AS GIVEN BELOW.
 「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 A210
 201-299, 301-399, Aug 01/05 CES **ON A/C 001-049, 051-062, 101-105, 151-152, 201-205,

 A. If the fault symptom is identified by the CFDS message GEN APU (GEN DIODE) and the upper ECAM DU warning APU GEN FAULT:
 - replace the GEN-APU (8XS) (Ref. AMM TASK 24-23-51-000-001) and (Ref. AMM TASK 24-23-51-400-001).
 NOTE : Do the check of the APU alternator and lube-pump oil filters for
____ metal contamination (Ref. AMM TASK 49-91-41-200-001) and (Ref. AMM TASK 49-91-45-200-002).
 (1) If the fault continues:

 - do a check of the wiring for short to open between respectively the APU GCU pins C/1, C/5 and the APU generator pins A/9, A/10 (Ref. ASM 24-23/01).

 (2) If the wiring is not correct:

 - repair it.

 (3) If the wiring is correct:

 - do a check of the wiring for open or short circuit between respectively the APU generator terminals T/1, T/2, T/3 and the APU GLC terminals A/F, A/E, A/D, then between respectively the APU GLC terminals A/D, A/E, A/F and the APU GCU pins B/3A, B/2B, B/1A.
 (a) If the wiring is not correct:

 - repair it.

 (b) If the wiring is correct:

 - replace the GCU-APU (1XS) (Ref. AMM TASK 24-23-34-000-001) and (Ref. AMM TASK 24-23-34-400-001).
 NOTE : Do not remove the APU GCU before you do the other steps of
____
 the trouble shooting.

 **ON A/C 063-099, 153-199, 206-210,
 A. If the fault symptom is identified by the CFDS message GEN APU (GEN DIODE) and the upper ECAM DU warning APU GEN FAULT:
 - replace the GEN-APU (8XS) (Ref. AMM TASK 24-23-51-000-001) and (Ref. AMM TASK 24-23-51-400-001).
 NOTE : Do the check of the APU alternator and lube-pump oil filters for
____ metal contamination (Ref. AMM TASK 49-91-41-200-001) and (Ref. AMM TASK 49-91-45-200-002).
 (1) If the fault continues:
 - do a check of the wiring for short to open between respectively the APU GCU pins C/1, C/5 and the APU generator pins A/9, A/10 (Ref. ASM 24-23/01).
 「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, 101-105, 151-199, ∞∞24-20-00∞∞∞∞∞∞∞∞∞∞Page A211
 201-210, Aug 01/05 CES

 (2) If the wiring is not correct:

 - repair it.

 (3) If the wiring is correct:

 - do a check of the wiring for open or short circuit between respectively the APU generator terminals T/1, T/2, T/3 and the module 29XN pins 7, 8, 9, then between respectively the module 29XN pins 7, 8, 9 and the APU GCU pins B/3A, B/2B, B/1A.
 (a) If the wiring is not correct:

 - repair it.

 (b) If the wiring is correct:

 - replace the GCU-APU (1XS) (Ref. AMM TASK 24-23-34-000-001) and (Ref. AMM TASK 24-23-34-400-001).
 NOTE : Do not remove the APU GCU before you do the other steps of
____
 the trouble shooting.

 **ON A/C 106-149, 211-299, 301-399,
 A. If the fault symptom is identified by the CFDS message GEN APU (GEN DIODE) and the upper ECAM DU warning APU GEN FAULT:
 - replace the GEN-APU (8XS) (Ref. AMM TASK 24-23-51-000-001) and (Ref. AMM TASK 24-23-51-400-001).
 NOTE : Do the check of the APU alternator and lube-pump oil filters for
____ metal contamination (Ref. AMM TASK 49-91-41-920-001) and (Ref. AMM TASK 49-91-41-920-002).
 (1) If the fault continues:

 - do a check of the wiring for short to open between respectively the APU GCU pins C/1, C/5 and the APU generator pins A/9, A/10 (Ref. ASM 24-23/01).

 (2) If the wiring is not correct:

 - repair it.

 (3) If the wiring is correct:

 - do a check of the wiring for open or short circuit between respectively the APU generator terminals T/1, T/2, T/3 and the module 29XN pins 7, 8, 9 then between respectively the module 29XN pins 7, 8, 9 and the APU GCU pins B/3A, B/2B, B/1A.
 (a) If the wiring is not correct:

 - repair it.

 (b) If the wiring is correct: