- place the positive (+) lead of an ohmmeter on the TCC sensor pin B and the negative (-) lead of the ohmmeter on the TCC sensor pin A. Record as r2.

 - find the average (r1+r2/2) (2.4 to 4.2 ohms).

 1 If the resistance values are out of the specified limits:
_
 - 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.
 2 If the resistance values are in the specified limits:
_
 - disconnect the harness CJ13 from the 6 o'clock junction box and do a check of the CJ13 resistance cable between: . pins 5 and 6 (2.4 to 4.2 Ohms) . pins 5 and 4 (> 10 Megohms) . pin 5 and ground (> 10 Megohms).
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ECES  F 『 E C F M E E E E 56 E E E a If the resistance values are out of the specified limits:

_
 - replace the harness CJ13 (Ref. AMM TASK 73-21-50-000-029) and (Ref. AMM TASK 73-21-50-400-029).
 b If the resistance values are in the specified limits:
_
 - disconnect the harness HJ13 from the ECU receptacle and do a check of the resistance between: . pins 7 and 8 (2.4 to 4.2 Ohms) . pins 7 and 17 (> 10 Megohms) . pin 7 and ground (> 10 Megohms).
 * If the resistance values are out of the specified limits:
 - replace the harness HJ13 (Ref. AMM TASK 73-21-50-000-046) and (Ref. AMM TASK 73-21-50-400-046).
 * If the resistance values are in the specified limits:
 - replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) 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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 Failure of the ECU PS3 Pressure Sensor - Engine 1 - Channel B
 1. Possible Causes
_______________
 - ECU (4000KS)

 - PS3 line

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 72-00-00-200-026 Inspection/Check of the PS3 Line AMM 72-00-00-220-001 Inspection of the PS3 Line Connections 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 73-29-00-710-040 Operational Test of the FADEC on the Ground (with
 Engine non Motoring)
 3. Fault Confirmation
__________________
 A. Do the operational test of the FADEC 1B on the ground (with engine non motoring) (Ref. AMM TASK 73-29-00-710-040).
 4. Fault Isolation
_______________
 A. This failure message is generated if the PS3 line is leaking, blocked or an internal ECU processing error has occurred.
 (1) If the failure message ECU, PS3 SNSR LINE is not confirmed:
 (a) Inspect PS3 line:
 - do a visual check of the PS3 line for dents, cracks, wear and weep holes free from obstruction (Ref. AMM TASK 72-00-00-200-026) and to make sure connections are properly tightened and in place (Ref. AMM TASK 72-00-00-220-001).
 1 If damage is found:
_
 - replace or retighten PS3 line (Ref. AMM TASK 72-00-00-220-001).
 2 If no damage is found:
_ - no maintenance action is required.
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 (2) If the failure message ECU, PS3 SNSR LINE is not confirmed, but is repetitive:

 (a) Replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).

 (b) If the fault continues:

 - inspect PS3 line.

 (3) If the failure message ECU, PS3 SNSR LINE is confirmed:

 1_ Do a visual check of the PS3 line for dents, cracks, wear and
 weep holes free from obstruction (Ref. AMM TASK 72-00-00-200-
　
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