- replace the LPTC valve (Ref. AMM TASK 75-22-10-000-002) and (Ref. AMM TASK 75-22-10-400-002).
 (c) If the fault continues during the subsequent flights:
 - replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).
 (d) If the fault continues during the subsequent flights: R - replace the harness HJ12 (ECU to the 6 o'clock junction box) R (Ref. AMM TASK 73-21-50-000-045) and (Ref. AMM TASK 73-21-50-
400-045).
 (e) If the fault continues during the subsequent flights:
 - replace the harness CJ12R (located in the right core compartment) (Ref. AMM TASK 73-21-50-000-028) and (Ref. AMM TASK 73-21-50-400-028).
 (3) If the failure message LPTC VLV, J12, ECU is confirmed: R - disconnect the CJ12R harness (LPT-B) connector (located in the R right core compartment) from the LPTC valve and visually examine R the CJ12R wire harness connector receptacles and the LPTC valve R connectors for damaged pins or contamination (Ref. AMM TASK 73-21-
50-210-002).
R (a) If damage is found:
R - repair or replace as required.

R (b) If no damage is found:

 - do an electrical resistance test through the LPTC valve between: . pins 2 and 3 (80 to 109.5 ohms) . pins 4 and 5 (85 to 115 ohms) . pins 6 and 7 (85 to 115 ohms) . pin 2 and the ground (> 10 megohms) . pin 4 and the ground (> 10 megohms) . pin 6 and the ground (> 10 megohms).
 (c) If the resistance values are out of the specified limits:
 - replace the LPTC valve (Ref. AMM TASK 75-22-10-000-002) and (Ref. AMM TASK 75-22-10-400-002).
 F 『 EEFF : ALL E ∞∞75-22-00∞∞∞∞∞∞∞∞∞∞Page 210
 E E Aug 01/99 E E ECES
E

 F 『
 E C F M E
 E E
 E 56 E
 E E

 (d) If the resistance values are in the specified limits: R - reconnect the CJ12R harness (LPT-B) connector to the LPTC R valve, R - disconnect the HJ12 harness (channel B) from the ECU (4000KS) R and visually examine the receptacle for damaged pins or R contamination (Ref. AMM TASK 73-21-50-210-002).
R 1_ If damage is found:
R - repair or replace as required.

R 2_If no damage is found:

 - do an electrical resistance test through the HJ12 harness between: . pins 4 and 5 (80 to 109.5 ohms) . pins 6 and 7 (85 to 115 ohms) . pins 2 and 3 (85 to 115 ohms) . pins 4 and 1 (> 10 megohms) . pins 6 and 1 (> 10 megohms) . pins 2 and 1 (> 10 megohms) . pin 4 and the ground (> 10 megohms) . pin 6 and the ground (> 10 megohms) . pin 2 and the ground (> 10 megohms).
 3 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).
 4 If the resistance values are out of the specified limits:
_ R - disconnect the HJ12 harness from the CJ12R harness located R at the 6 o'clock junction box and do an electrical R resistance test through the CJ12R harness between:
 . pins 20 and 21 (80 to 109.5 ohms) . pins 7 and 19 (85 to 115 ohms) . pins 2 and 9 (85 to 115 ohms) . pins 20 and 8 (> 10 megohms) . pins 7 and 8 (> 10 megohms) . pins 2 and 8 (> 10 megohms) . pin 20 and the ground (> 10 megohms) . pin 7 and the ground (> 10 megohms) . pin 2 and the ground (> 10 megohms).
 5 If the resistance values are in the specified limits:
_
 - replace the harness HJ12 (ECU to the 6 o'clock junction box) (Ref. AMM TASK 73-21-50-000-045) and (Ref. AMM TASK 73-21-50-400-045).
 6 If the resistance values are out of the specified limits:
_
 - replace the harness CJ12R (Ref. AMM TASK 73-21-50-000-028) and (Ref. AMM TASK 73-21-50-400-028).
 F 『 EEFF : ALL E ∞∞75-22-00∞∞∞∞∞∞∞∞∞∞Page 211
 E E Aug 01/99 E E ECES
E F 『 EEFF : ALL E ∞∞75-22-00∞∞∞∞∞∞∞∞∞∞Page 212

 F  『
 E  C F M  E
 E  E
 E  56  E
 E  E 

R  B. Do the test given in Para. 3.A. 
R  (1) No additional maintenance action is required if the fault is not 
R  confirmed. 
R  (2) Repeat the fault isolation procedure if the fault continues. 
R

 E E May 01/99 E E ECES
E

 F 『
 E C F M E
 E E
 E 56 E
 E E

 TASK 75-22-00-810-804
 Loss of the Feedback Signal from the LPTC Valve - Engine 2 - Channel B
 1. Possible Causes
_______________
 - LPTC valve

 - ECU (4000KS)