- do a visual check of each connector for correct condition.

 a If damage is found:
_ - repair or replace as required.
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ECES  (b) If the resistance values are in the specified limits:

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 b_ If nothing is found:
 - replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001)
 and (Ref. AMM TASK 73-21-60-400-001).

 - do a manual deployment of the thrust reverser blocker doors (Ref. AMM TASK 78-32-41-860-001)

 - do a resistance check of the harnesses J5 and J6 (Ref. AWM 71-51-05) between: . pins 24 and 23 (>10 megohms) . pins 24 and 2 (<5 ohms) . pins 24 and 11 (>10 megohms) . pins 2 and 11 (>10 megohms) . pin 24 and the ground (>10 megohms) . pin 23 and the ground (>10 megohms).

 1 If the resistance values are out of the specified limits:
_
 - with the thrust reverser blocker doors in the stowed position, disconnect the harnesses J5 and J6 from each stow switch,

 - do a resistance check on each stow switch between: . pins 4 and 7 (>10 megohms) . pins 4 and 9 (<5 ohms) . pin 4 and the ground (>10 megohms) . pins 4 and 12 (>10 megohms) . pins 2 and 3 (>10 megohms) . pins 2 and 5 (<5 ohms) . pin 2 and the ground (>10 megohms) . pins 2 and 1 (>10 megohms).

 a If the resistance values are out of the specified limits:
_
 - replace the defective: . SW-BLOCKER DOOR STOW, UPPER R (4104KS1) or/and . SW-BLOCKER DOOR STOW, LOWER R (4104KS2) or/and . SW-BLOCKER DOOR STOW, LOWER L (4104KS3) or/and . SW-BLOCKER DOOR STOW, UPPER L (4104KS4) (Ref. AMM TASK 78-31-18-000-040) and (Ref. AMM TASK 78-31-18-400-040).
 b If the resistance values are in the specified limits:
_
 - do a continuity and insulation check of the thrust reverser and harnesses J5 and J6 between the stow switches including the junction box (4100KS),

 - do a visual check of each connector for correct condition.

 c If damage is found:
_ - repair or replace as required.
 d If nothing is found:
_
 - replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).
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ECES  F 『 E C F M E E E E 56 E E E 2 If the resistance values are in the specified limits:

_
 - with the thrust reverser blocker doors deployed, disconnect the harnesses J5 and J6 from each stow switch,

 - do a resistance check on each stow switch (Ref. AWM 71-51-05) between: . pins 4 and 7 (<5 ohms) . pins 4 and 9 (>10 megohms) . pin 4 and the ground (>10 megohms) . pins 4 and 12 (>10 megohms) . pins 2 and 3 (<5 ohms) . pins 2 and 5 (>10 megohms) . pin 2 and the ground (>10 megohms) . pins 2 and 1 (>10 megohms).

 a If the resistance values are out of the specified limits:
_
 - replace the defective: . SW-BLOCKER DOOR STOW, UPPER R (4104KS1) or/and . SW-BLOCKER DOOR STOW, LOWER R (4104KS2) or/and . SW-BLOCKER DOOR STOW, LOWER L (4104KS3) or/and . SW-BLOCKER DOOR STOW, UPPER L (4104KS4) (Ref. AMM TASK 78-31-18-000-040) and (Ref. AMM TASK 78-31-18-400-040).
 b If the resistance values are in the specified limits:
_
 - do a continuity and insulation check of the thrust reverser and harnesses J5 and J6 between the stow switches including the junction box (4100KS),

 - do a visual check of each connector for correct condition.

 c If damage is found:
_ - repair or replace as required.
 d If nothing is found:
_
 - replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).
 (2) If the test does not give the maintenance message STOW SW, J5/J6, ECU:
 (a) Do a check of the connectors of the thrust reverser harness, harnesses J5 and J6 for looseness, contamination, and bent pins.
 1 If damage is found:
_
 - retighten, clean or repair as required (Ref. AMM TASK 78-31-42-210-041).
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 (b) Do a check of the harness routing and look for chafing or cut in the harness envelope.
 1 If damage is found:
　
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