T2 in Disagreement with ADIRUx or T2 in Range Failed

TASK 73-21-00-810-897-A
T2 in Disagreement with ADIRUx or T2 in Range Failed

1. Possible Causes

HARNESS-FAN, WF02 [4218KS]
HARNESS-FAN, WF01 [4217KS]
HARNESS-T2 PROBE [4110KS]
ADIRU-1 [1FP1]
ADIRU-2 [1FP2]
T2 PROBE [4001KS]
[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 34-12-34-000-001	Removal of the ADIRU
AMM 34-12-34-400-001	Installation of the ADIRU
AMM 34-13-00-740-002	INTERFACE TEST of the ADR
AMM 70-70-00-910-803	SPOP 6 - Cleaning of the Contact Points and Wiring Harnesses
AMM 71-00-00-860-814	Shutdown of the Engine
AMM 71-00-00-860-822	Start the Engine (Normal Manual Start)
AMM 71-00-00-860-823	Start the Engine (Normal Automatic Start)
AMM 71-13-00-010-802	Opening of the Fan Cowl Doors
AMM 71-13-00-410-802	Closing of the Fan Cowl Doors
AMM 71-61-12-000-801	Removal of the T2 Probe
AMM 71-61-12-400-801	Installation of the T2 Probe
AMM 71-61-51-000-801	Removal of the Inlet Cowl T2-Probe Harness
AMM 71-61-51-400-801	Installation of the Inlet Cowl T2-Probe Harness
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 73-21-61-000-802	Removal of the Electronic Engine Control (EEC) Wiring Harness (WF01)
AMM 73-21-61-400-802	Installation of the Electronic Engine Control (EEC) Wiring Harness (WF01)
AMM 73-21-62-000-802	Removal of the EEC Wiring Harness (WF02)
AMM 73-21-62-400-802	Installation of the EEC Wiring Harness (WF02)
AWM 732524
AWM 732525
AWM 732533
AWM 732534
EEC Wiring Harnesses
T2 Probe Wiring Harness
T2 Probe Wiring Schematic
Pylon Junction Box Connections
WF01 and WF02 Interconnect Wiring Harnesses
ADIRU 1 Wiring Schematic
ADIRU 2 Wiring Schematic

3. Fault Confirmation
Subtask 73-21-00-710-150-A ** ON A/C NOT FOR ALL

A. Do an engine run to idle to confirm repair of this fault AMM 71-00-00-860-822 or AMM 71-00-00-860-823.
(1) Shutdown the engine AMM 71-00-00-860-814.
(2) On Multipurpose Control and Display Unit (MCDU) screen, check if the fault is displayed on ground scanning report.

NOTE: The Electronic Engine Control (EEC) channel A and channel B have detected that the T2 probe circuits and the Air Data and Inertial Reference Unit (ADIRU) 1 and 2 circuits do not agree. The T2 probe is mounted on the fan cowling, located at the 1 o'clock position. The ADIRU 1 and ADIRU 2 are located in the avionics compartment. The EEC is located on the fan case at the 2 o'clock position.

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).

(3) If the maintenance message does not come back, examine the harnesses 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 message.
(4) 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 73-21-00-810-169-A ** ON A/C NOT FOR ALL

A. If there is confirmation of the fault:
(1) Open the fan cowl doors AMM 71-13-00-010-802.
(2) Examine the WF02 (4218KS), WF01 (4217KS) and WN30 (4110KS) harnesses, connectors P1 (4000KS-P1) and P2 (4000KS-P2) - EEC (4000KS), interconnect P103 (4105VC-A)/J103 (4105VC) and interconnect P122 (4106VC-A)/J122 (4106VC) and connector P22 (4001KS- P22) - T2 probe (4001KS) and connectors P402 (402VC-A) and P403 (403VC-A) - Pylon junction box, for problems which are possible between the EEC (4000KS), the T2 probe (4001KS) and the pylon junction box.
(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 HARNESS-FAN, WF02(4218KS) AMM 73-21-62-000-802 and AMM 73-21-62-400-802, or
2 Replace HARNESS-FAN, WF01(4217KS) AMM 73-21-61-000-802 and AMM 73-21-61-400-802, or
3 Replace HARNESS-T2 PROBE(4110KS) AMM 71-61-51-000-801 and AMM 71-61-51-400-801.
4 Do the test given in Para. 3.
(3) If no problems are found with the harnesses, use a PLIERS - JAWED, SOFT to disconnect electrical connectors P1 (4000KS-P1) and P2 (4000KS-P2) from the EEC (4000KS), interconnect P103 (4105VC-A)/J103 (4105VC) and interconnect P122 (4106VC-A)/J122 (4106VC) and connector P22 (4001KS-P22) from the T2 probe (4001KS) and connectors P402 (402VC-A) and P403 (403VC-A) from the pylon junction box.
(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 electrical connectors P1 (4000KS-P1) and P2 (4000KS-P2) to the EEC (4000KS), interconnect P103 (4105VC-A)/J103 (4105VC) and interconnect P122 (4106VC-A)/J122 (4106VC) and connector P22 (4001KS-P22) to the T2 probe (4001KS) and connectors P402 (402VC-A) and P403 (403VC-A) from the pylon junction box.
(d) Do the test given in Para. 3.
(4) If the fault continues:
(a) Disconnect electrical connectors P1 (4000KS-P1) and P2 (4000KS-P2) from the EEC (4000KS), interconnect P103 (4105VC-A)/J103 (4105VC) and interconnect P122 (4106VC-A)/J122 (4106VC) and connector P22 (4001KS-P22) from the T2 probe (4001KS) and connectors P402 (402VC-A) and P403 (403VC-A) from the pylon junction box. Use a MULTIMETER - STANDARD to test the T2 probe (4001KS), ADIRU 1(1FP1), ADIRU 2 (1FP2) circuits in the harnesses. Refer to Table 1, Table 2, Table 3 and Table 4. 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: T2 Probe Channel A Connector Contacts

WF02 (4218KS) Harness P1 (4000KS-P1) EEC (4000KS) Connector Contacts	WF02 (4218KS) Harness P122 (4106VC-A) Connector Contacts	WN30 (4110KS) Harness J122 (4106VC) Connector Contacts	WN30 (4110KS) Harness P22 (4001KS-P22) T2 Probe (4001KS) Connector Contacts
P	5	5	5
R	4	4	4
n	1	1	1

Table 2: T2 Probe Channel B Connector Contacts

WF01 (4217KS) Harness P2 (4000KS-P2) EEC (4000KS) Connector Contacts	WF01 (4217KS) Harness P103 (4105VC-A) Connector Contacts	WF02 (4218KS) Harness J103 (4105VC) Connector Contacts	WF02 (4218KS) Harness P122 (4106VC-A) Connector Contacts	WN30 (4110KS) Harness J122 (4106VC) Connector Contacts	WN30 (4110KS) Harness P22 (4001KS-P22) T2 Probe Connector Contacts
P	1	1	9	9	9
R	2	2	10	10	10
n	3	3	2	2	2

Table 3: EEC to Pylon Junction Box ADIRU 1 Channel A Circuit Connector Contacts

WF02 (4218KS) Harness P1 (4000KS-P1) EEC (4000KS) Connector Contacts	WF02 (4218KS) Harness P402 (402VC-A) Pylon Junction Box Connector Contacts
X	10
t	25

Table 4: EEC to Pylon Junction Box ADIRU 2 Channel B Circuit Connector Contacts

WF01 (4217KS) Harness P2 (4000KS-P2) EEC (4000KS) Connector Contacts	WF01 (4217KS) Harness P403 (403VC-A) Pylon Junction Box Connector Contacts
X	10
t	25

(b) If a problem is found with the harnesses or connectors:
1 Replace HARNESS-FAN, WF02 [4218KS] AMM 73-21-62-000-802 and AMM 73-21-62-400-802, or
2 Replace HARNESS-FAN, WF01 [4217KS] AMM 73-21-61-000-802 and AMM 73-21-61-400-802, or
3 Replace HARNESS-T2 PROBE [4110KS] AMM 71-61-51-000-801 and AMM 71-61-51-400-801.
4 Do the test given in Para. 3.
(5) If no problems are found with the harnesses or the fault continues, check for the Total Air Temperature (TAT) sensors fault and check the aircraft wiring from the ADIRU 1 and ADIRU 2 to the pylon junction box.
(a) Check for TAT sensors fault on ADIRU 1 then on ADIRU 2 AMM 34-13-00-740-002.
1 Troubleshoot faults found as necessary.
(b) For fault on ENG 1, check the aircraft wiring as follows:
1 Disconnect electrical connectors (402VC-A) and (403VC-A).
2 Remove ADIRU-1 [1FP1] and ADIRU-2 [1FP2] AMM 34-12-34-000-001.
3 On rack side, check for wire-to-wire short and short to ground at pins 12B and 12D of connectors AA of ADIRU 1 and ADIRU 2.
4 Put a shunt at pins 12B and 12D of connectors AA of ADIRU 1 and ADIRU 2.
5 At connectors (402VC) and (403VC), check for continuity between pins 10 and 25.
6 Repair or replace aircraft wiring if any fault found:
a For ADIRU 1, refer to AWM 732525.
b For ADIRU 2, refer to AWM 732533.
(c) For fault on ENG 2, check the aircraft wring as follows:
1 Disconnect electrical connectors (402VC-A) and (403VC-A).
2 Remvove ADIRU-1 [1FP1] and ADIRU-2 [1FP2] AMM 34-12-34-000-001.
3 On rack side, check for wire-to-wire short and short to ground at pins 14B and 14D of connectors AA of ADIRU 1 and ADIRU 2.
4 Put a shunt at pins 14B and 14D of connectors AA of ADIRU 1 and ADIRU 2.
5 At connectors (402VC) and (403VC), check for continuity between pins 10 and 25.
6 Replace or repair the aircraft wiring if any fault found:
a For ADIRU 1, refer to AWM 732524.
b For ADIRU 2, refer to AWM 732534.
7 Remove the both shunts on ADIRU rack.
8 Install ADIRU-1 [1FP1] and ADIRU-2 [1FP2] AMM 34-12-34-400-001.
9 At pylon junction box, connect connectors (402VC-A) and (403VC-A).
10 Do the test given in Para. 3.
(6) If no problems are found with the aircraft wiring or the fault continues:
(a) Replace T2 PROBE [4001KS] AMM 71-61-12-000-801 and AMM 71-61-12-400-801
(b) Do the test given in Para. 3.
(7) If the fault continues:
(a) Replace ADIRU-1 [1FP1] and ADIRU-2 [1FP2] AMM 34-12-34-000-001 and AMM 34-12-34-400-001.
(b) Do the test given in Para. 3.
(8) If the fault continues:
(a) Replace the [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 73-21-00-860-089-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 fan cowl doors AMM 71-13-00-410-802.

[Rev.8 from Aug 2018] 2026.04.04 04:40:51 UTC