Feedback Disagree on Channel B of the BSV on engine 1

TASK 73-10-00-810-851-A
Feedback Disagree on Channel B of the BSV on engine 1

1. Possible Causes

J14 Identification connector
HJ11 harness
CJ12R harness
burner staging valve
ECU [4000KS]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 73-11-70-000-002	Removal of the Burner Selection Valve (BSV) for SAC Engines
AMM 73-11-70-400-002	Installation of the Burner Selection Valve (BSV) for SAC Engines
AMM 73-21-50-000-026	Removal of the CJ11R Harness for SAC Engines
AMM 73-21-50-000-044	Removal of the HJ11 Harness for SAC Engines
AMM 73-21-50-400-026	Installation of the CJ11R Harness for SAC Engines
AMM 73-21-50-400-044	Installation of the HJ11 Harness for SAC Engines
AMM 73-21-60-000-001	Removal of the Electronic Control Unit (ECU)
AMM 73-21-60-400-001	Installation of the Electronic Control Unit (ECU)
AMM 73-21-90-000-002	Removal of the Engine Identification Connector
AMM 73-21-90-400-002	Installation of the Engine Identification Connector
AMM 73-21-90-860-001	Programming of the Identification Plug (Push-Pull Design) for SAC engines
ASM 732518
AMM 73-29-00-710-040	Operational Test of the FADEC on the ground (with Engine Motoring)

3. Fault Confirmation
Subtask 73-10-00-710-144-A ** ON A/C NOT FOR ALL

A. Do the operational test of the FADEC on the ground (with engine motoring) AMM 73-29-00-710-040.

4. Fault Isolation
Subtask 73-10-00-810-112-A ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message BSV, J12, J14(WRONG):

verify the nameplate of the engine:

(1) If the nameplate is for a SAC engine:

Replace J14 Identification connector AMM 73-21-90-000-002 AMM 73-21-90-400-002 or Do a Re-programming of the Identification Connector (Push-pull Design only) AMM 73-21-90-860-001.

NOTE: This fault will be set if a DAC ID plug is installed on a SAC engine. The engine nameplate and ID plug can be checked on the MCDU screen. Access reporting functions, then select the LRU Identification Screen. Line 4 of the LRU Identification Screen will display.

"EGT MON" or "SAC CONFIG" for a SAC ID plug
"DAC CONFIG" for a DAC ID plug

(2) If the nameplate is for a DAC engine:

Disconnect the HJ12 harness from the ECU (4000KS)
Do a resistance check of the HJ12 harness between ASM 732518:
. pins 34 and 35 (72 to 89 ohms)
. pins 18 and 36 (42 to 52 ohms)
. pins 16 and 33 (42 to 52 ohms)
. pins 34 and 17 (more than 10 megohms)
. pins 18 and 17 (more than 10 megohms)
. pins 16 and 17 (more than 10 megohms)
. pin 34 and the ground (more than 10 megohms)
. pin 18 and the ground (more than 10 megohms)
. pin 16 and the ground (more than 10 megohms)

(a) If the resistance values are out of the specified limits:

Disconnect the HJ12 harness from the cable CJ11R at the 6 o'clock junction box
Do a resistance check of the cable CJ12R between ASM 732518.
. pins 17 and 6 (72 to 89 ohms)
. pins 19 and 18 (42 to 52 ohms)
. pins 20 and 8 (42 to 52 ohms)
. pins 17 and 7 (more than 10 megohms)
. pins 19 and 7 (more than 10 megohms)
. pins 20 and 7 (more than 10 megohms)
. pin 17 and the ground (more than 10 megohms)
. pin 19 and the ground (more than 10 megohms)
. pin 20 and the ground (more than 10 megohms)

1 If the resistance value are in the specified limits:

replace the HJ11 harness AMM 73-21-50-000-044 AMM 73-21-50-400-044.

2 If the resistance value are out of the specified limits:

Disconnect the harness CJ12R from the BSV valve.
Do a resistance check at the BSV valve between ASM 732518.
. pins 4 and 2 (72 to 89 ohms)
. pins 6 and 7 (42 to 52 ohms)
. pins 8 and 9 (42 to 52 ohms)
. pins 2 and 1 (more than 10 megohms)
. pins 6 and 1 (more than 10 megohms)
. pins 8 and 1 (more than 10 megohms)
. pin 2 and the ground (more than 10 megohms)
. pin 6 and the ground (more than 10 megohms)
. pin 8 and the ground (more than 10 megohms)

a If the resistance values are in the specified limits:

replace the CJ12R harness AMM 73-21-50-000-026 AMM 73-21-50-400-026.

b If the resistance values are out of the specified limits:

If the burner staging valve has been deleted:
No more action is necessary.
If the burner staging valve is installed:
Replace the burner staging valve AMM 73-11-70-000-002 and AMM 73-11-70-400-002.

(b) If the resistance values are in the specified limits:

replace the ECU [4000KS] AMM 73-21-60-000-001 AMM 73-21-60-400-001.

Subtask 73-10-00-710-145-A ** ON A/C NOT FOR ALL

B. Do the test given in Para. 3.A.

[Rev.8 from Aug 2018] 2026.04.04 04:35:17 UTC