SAV cannot be Powered by EEC, Except in Case of Power Fault Channel B

TASK 80-11-00-810-826-A
SAV cannot be Powered by EEC, Except in Case of Power Fault Channel B

1. Possible Causes

VALVE-PNEUMATIC STARTER [4005KS]
W03 HARNESS [4087KS]
W04 HARNESS [4088KS]
WC08 HARNESS-CORE [4094KS]
[4000KS]

2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	MULTIMETER - STANDARD
No specific	1	PLIERS - JAWED, SOFT

B. Referenced Information

REFERENCE	DESIGNATION
TSM TASK 71-00-00-810-834-A	General Troubleshooting Guidelines for Additional Troubleshooting Information
TSM TASK 71-00-00-810-835-A	Component and Harness Intermittent Troubleshooting Procedure for Guidance Troubleshooting Intermittent Faults
AMM 70-70-00-910-803	SPOP 6 - Cleaning of the Contact Points and Wiring Harnesses
AMM 73-21-00-710-806	Test No.7 - EEC Operation Test (Self Test)
AMM 73-21-01-000-801	Removal of the Electronic Engine Control (EEC)
AMM 73-21-01-400-801	Installation of the Electronic Engine Control (EEC)
AMM 73-21-63-000-802	Removal of the Electronic Engine Control (EEC) Wiring Harness (W03)
AMM 73-21-63-400-802	Installation of the Electronic Engine Control (EEC) Wiring Harness (W03)
AMM 73-21-64-000-802	Removal of the Electronic Engine Control (EEC) Wiring Harness (W04)
AMM 73-21-64-400-802	Installation of the Electronic Engine Control (EEC) Wiring Harness (W04)
AMM 73-21-68-000-802	Removal of the EEC Wiring Harness (WC08)
AMM 73-21-68-400-802	Installation of the EEC Wiring Harness (WC08)
AMM 78-36-00-010-802	Opening of the Thrust Reverser Cowl-Doors
AMM 78-36-00-410-802	Closing of the Thrust Reverser Cowl-Doors
AMM 80-11-03-000-801	Removal of the Starter Air Control Valve
AMM 80-11-03-400-801	Installation of the Starter Air Control Valve
EEC Wiring Harnesses
Starter Air Control Valve Wiring Harness
Starter Air Valve Schematic

3. Fault Confirmation
Subtask 80-11-00-710-089-A ** ON A/C NOT FOR ALL

A. Do the EEC system interactive test to confirm this fault. Refer to FADEC self test AMM 73-21-00-710-806.

NOTE: The Electronic Engine Control (EEC) has detected that the starter air control valve solenoid on the starter air control valve cannot be powered by the EEC.

Refer to the general troubleshooting guidelines for additional troubleshooting information (Ref. TSM TASK 71-00-00-810-834).
Refer to the component and harness intermittent troubleshooting procedure for guidance troubleshooting intermittent faults (Ref. TSM TASK 71-00-00-810-835).

(1) Turn on power to the EEC to confirm this fault.
(2) If the maintenance message does not come back, examine the harness and electrical connectors as described in the component and harness intermittent fault isolation procedure (Ref. TSM TASK 71-00-00-810-835).
(a) If no problems are found, return the engine to service. Monitor the engine for reoccurring maintenance messages.
(3) If the maintenance message comes back (hard fault), go to the Para. Fault Isolation.

4. Fault Isolation

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE AFTER SHUTDOWN. THE ENGINE CAN STAY HOT FOR A LONG TIME. IF YOU DO NOT OBEY THIS WARNING, INJURY CAN OCCUR.

WARNING: REFER TO THE MSDS FOR ALL MATERIAL USED AND THE MANUFACTURER'S SAFETY INSTRUCTIONS FOR ALL EQUIPMENT USED. IF YOU DO NOT OBEY THIS WARNING, INJURY CAN OCCUR.

CAUTION: MAKE SURE YOU REMOVE ELECTRICAL POWER FROM THE EEC BEFORE YOU REMOVE THE ELECTRICAL CONNECTORS. IF YOU DO NOT OBEY THIS INSTRUCTION, DAMAGE TO THE EEC CAN OCCUR.

Subtask 80-11-00-810-077-A ** ON A/C NOT FOR ALL

A. If there is confirmation of the fault:
(1) Open the thrust reverser cowl-doors AMM 78-36-00-010-802.
(2) Examine the W03 (4087KS), W04 (4088KS) and WC08 (4094KS) harnesses and connector P14 (4000KS-P14) - EEC (4000KS), interconnect P107 (4101VC-A)/J107 (4101VC) and interconnect J109 (4112VC)/P109 (4112VC-A) and connector P26 (4005KS-P26) - starter air control valve (4005KS), for problems which are possible between the EEC (4000KS) and the starter air control valve (4005KS).
(a) Inspect for harness damage.
(b) Inspect for loose or damaged connectors.

NOTE: Loose connectors must be disconnected and examined for further wear or damage.

(c) If a problem is found with the harnesses or connectors:
1 Replace W03 HARNESS(4087KS) AMM 73-21-63-000-802 and AMM 73-21-63-400-802, or
2 Replace W04 HARNESS(4088KS) AMM 73-21-64-000-802 and AMM 73-21-64-400-802, or
3 Replace WC08 HARNESS-CORE(4094KS) AMM 73-21-68-000-802 and AMM 73-21-68-400-802.
4 Do the test given in Para. 3.
(3) If no problems are found with the harnesses, use a PLIERS - JAWED, SOFT to disconnect the electrical connector P14 (4000KS-P14) from the EEC (4000KS), interconnect P107 (4101VC-A)/J107 (4101VC) and interconnect J109 (4012VC)/P109 (4112VC-A) and connector P26 (4005KS-P26) from the starter air control valve (4005KS) for possible problems between the EEC (4000KS) and the starter valve (4005KS).
(a) Examine the pins and sockets (contacts) for alignment and damage. Look for contacts pushed rearward into the connector face. Replace parts as necessary.
(b) Clean the contacts with contact cleaner and clean cloth per SPOP 6. Blow dry with air (at less than 30 psi) across the connector face AMM 70-70-00-910-803.
(c) Reconnect the electrical connector P14 (4000KS-P14) to the EEC (4000KS), interconnect P107 (4101VC-A)/J107 (4101VC) and interconnect J109 (4112VC)/P109 (4112VC-A) and connector P26 (4005KS-P26) to the starter air control valve (4005KS).
(d) Do the test given in Para. 3.
(4) If the fault continues:
(a) Replace VALVE-PNEUMATIC STARTER [4005KS] AMM 80-11-03-000-801 and AMM 80-11-03-400-801.
(b) Do the test given in Para. 3.
(5) If the fault continues:
(a) Disconnect the electrical connector P14 (4000KS-P14) from the EEC (4000KS), interconnect P107 (4101VC-A)/J107 (4101VC) and interconnect J109 (4112VC)/P109 (4112VC-A) and connector P26 (4005KS-P26) from the starter air control valve (4005KS). Use a MULTIMETER - STANDARD to test the starter air control valve channel B circuits in the harnesses. Refer to Table 1. Look for:
1 Wire-to-wire shorts
2 Shorts to ground
3 Continuity (less than 5 ohms resistance).

NOTE: A short to ground is found when the resistance is less than 100 000 (100K) ohms.

Table 1: Starter Air Control Valve Solenoid Channel B Connector Contacts

W03(4087KS) Harness P14 (4000KS-P14) EEC(4000KS) Connector Contacts	W03(4087KS) Harness P107 (4101VC-A) Connector Contacts	W04(4088KS) Harness J107 (4101VC) Connector Contacts	W04(4088KS) Harness J109 (4112VC) Connector Contacts	WC08(4094KS) Harness P109 (4112VC-A) Connector Contacts	WC08(4094KS) Harness P26 (4005KS-P26) Starter Air Control Valve (4005KS) Connector Contacts
Z	27	27	18	18	5
a	28	28	19	19	4

(b) If a problem is found with the harnesses or connectors:
1 Replace W03 HARNESS [4087KS] AMM 73-21-63-000-802 and AMM 73-21-63-400-802, or
2 Replace W04 HARNESS [4088KS] AMM 73-21-64-000-802 and AMM 73-21-64-400-802, or
3 Replace WC08 HARNESS-CORE [4094KS] AMM 73-21-68-000-802 and AMM 73-21-68-400-802.
4 Do the test given in Para. 3.
(6) If the fault continues:
(a) Replace [4000KS] AMM 73-21-01-000-801 and AMM 73-21-01-400-801.
(b) Do the test given in Para. 3.

5. Close-up
Subtask 80-11-00-860-055-A ** ON A/C NOT FOR ALL

A. Put the aircraft back to its initial configuration.
(1) Make sure that the work area is clean and clear of tools and other items.
(a) Close the thrust reverser cowl-doors AMM 78-36-00-410-802.

[Rev.8 from Aug 2018] 2026.04.04 04:38:43 UTC