Failure of the TDC AC1 Sensor

TASK 24-22-00-810-809-A
Failure of the TDC AC1 Sensor

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
ASM 242202
AMM 24-22-18-000-001	Removal of the TDC AC Sensor 1(2)
AMM 24-22-18-400-001	Installation of the TDC AC Sensor 1(2)
AMM 24-22-34-000-001	Removal of the GCU-1(2)
AMM 24-22-34-400-001	Installation of the GCU-1(2)
AMM 24-41-00-740-004	Operational Check of the GPCU via the CFDS
ASM 244102
AMM 24-41-34-000-001	Removal of the Ground Power Control Unit (GPCU)
AMM 24-41-34-400-001	Installation of the Ground Power Control Unit (GPCU)

3. Fault Confirmation
Subtask 24-22-00-740-051-A ** ON A/C NOT FOR ALL

A. Test
(1) Do the operational check of the GPCU with the CFDS AMM 24-41-00-740-004.

4. Fault Isolation
Subtask 24-22-00-810-058-B ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message TDC AC SENSOR 50XU1:

(1) If the fault continues:

do a check of the wiring :
. from the pin AB/12A of the GPCU (1XG) to the pin A/A1 of the ENG1 LO OIL PRESS RELAY (7XT)
. from the pin A/A2 of the ENG1 LO OIL PRESS RELAY (7XT)to the pin A/B1 of the TDC AC1 SENSOR (50XU1)
. from the pin A/B3 of the TDC AC1 sensor to the pin AB/10A of the GPCU
. from the pin A/B3 of the TDC AC1 sensor to the pin AA/3A of the GCU1 (1XU1) ASM 242202.

(a) If there is no continuity:

(b) If there is continuity:

do a check of the wiring
. from the pins AA/13C, AA/14C and AA/11D of the GPCU to the pins AB/14C, AB/14D and AB/15C of the GCU1 ASM 244102.

1 If there is no continuity:

2 If there is continuity:

a If the fault continues:

Subtask 24-22-00-740-052-A ** ON A/C NOT FOR ALL

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:26:35 UTC