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 1 If the fault continues:

_
 - replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).
 2 If the fault continues:
_
 - replace the harness HJ13 (Ref. AMM TASK 73-21-50-000-046) and (Ref. AMM TASK 73-21-50-400-046).
 3 If the fault continues:
_
 - disconnect the CJ13 connector (TCC-B) from the TCC sensor (3 O'Clock).

 - do a cleaning of the harness connector using a bristle brush with stoddard solvent (Material No. CP2011) (Ref. AMM TASK 73-21-50-210-002).

 - replace the TCC sensor (Ref. AMM TASK 73-21-70-000-002) and (Ref. AMM TASK 73-21-70-400-002).

 NOTE : Tighten the connector by hand plus one eighth of a
____ turn. If necessary use soft nose pliers.
 4 If the fault continues:
_
 - replace the harness CJ13 (Ref. AMM TASK 73-21-50-000-029) and (Ref. AMM TASK 73-21-50-400-029).
 (3) If the failure message TCC SNSR, J13, ECU is confirmed only on channel B:
R (a) Disconnect the connector (TCC-B) on the harness CJ13 from the TCC R sensor (3 o'clock) and do a check of the resistance as follows: R R - place the positive (+) lead of an ohmmeter on the TCC sensor R pin A and the negative (-) lead of the ohmmeter on the TCC R sensor pin B. Record as r1. R - place the positive (+) lead of an ohmmeter on the TCC sensor R pin B and the negative (-) lead of the ohmmeter on the TCC R sensor pin A. Record as r2. R - find the average (r1+r2/2) (2.4 to 4.2 ohms). R
 1 If the resistance values are out of the specified limits:
_
R - replace the TCC sensor (Ref. AMM TASK 73-21-70-000-002) and
R (Ref. AMM TASK 73-21-70-400-002).
R NOTE : Tighten the connector by hand plus one eighth of a
____ R turn. If necessary use soft nose pliers.
 2 If the resistance values are in the specified limits:
_
R - disconnect the harness CJ13 from the 6 o'clock junction box
R and do a check of the CJ13 resistance cable between:
R . pins 5 and 6 (2.4 to 4.2 Ohms)

R . pins 5 and 4 (> 10 Megohms)

R . pin 5 and ground (> 10 Megohms).

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R  a_  If the resistance values are out of the specified limits:
R  - replace the harness CJ13 (Ref. AMM TASK 73-21-50-000-029) 
R  and (Ref. AMM TASK 73-21-50-400-029). 
R  b_  If the resistance values are in the specified limits:
R  - disconnect the harness HJ13 from the ECU receptacle and 
R  do a check of the resistance between: 
R  . pins 7 and 8 (2.4 to 4.2 Ohms) 
R  . pins 7 and 17 (> 10 Megohms) 
R  . pin 7 and ground (> 10 Megohms).
 * If the resistance values are out of the specified
 limits: 
R  - replace the harness HJ13 (Ref. AMM TASK 73-21-50-000-
R  046) and (Ref. AMM TASK 73-21-50-400-046). 
R
 * If the resistance values are in the specified limits: 
R  - replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-
R  001) and (Ref. AMM TASK 73-21-60-400-001).
 C. Do the test given in Para. 3.A.
 (1) No additional maintenance action is required if the fault is not
 confirmed.
 (2) Repeat the fault isolation procedure if the fault continues.

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 Loss of the Output B Bus on EIU 1
 1. Possible Causes
_______________

 - EIU-1 (1KS1)

 - wiring from the EIU 1 (1KS1) pins AB/5H, 5K to the first terminal block

 - ECU (4000KS)

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 31-50-00-710-001 Ground Scanning of the Central Warning System AMM 73-21-60-000-001 Removal of the Electronic Control Unit (ECU)(4000KS) AMM 73-21-60-400-001 Installation of the Electronic Control Unit
　
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