- disconnect the connector of the warning light panel 17WN1 and do a check for a short to ground at pin C of the connector of the warning light panel 17WN1 (Ref. ASM 52-73/02).

 a If there is a short to ground:
_
 - do a check and repair the wiring from the warning light panel 16WN2 pin D to the warning light panel 16WN1 pin C, (Ref. ASM 52-73/02).

 - do a check and repair the wiring from the warning light panel 16WN1 pin D to the warning light panel 17WN1 pin C (Ref. ASM 52-73/02).

 b If there is no short to ground:
_
 - replace the WARN LT PNL-CABIN PRESSURE, FWD L DOOR (16WN1) (Ref. AMM TASK 52-73-22-000-001) and (Ref. AMM TASK 52-73-22-400-001).
 B. If the CABIN PRESSURE warning light panels do not flash with
 overpressure:

 - disconnect the connector of the cabin pressure detection pressure switch 14WN and install a jumper wire between pin B and C.
 (1) If the warning light panels of the doors flash:
 - replace the PRESS SW-CABIN PRESS DET (14WN) (Ref. AMM TASK 52-73-12-000-001) and (Ref. AMM TASK 52-73-12-400-001).
 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1R EFF : 001-049, 051-099, 101-149, 151-199, ∞∞52-73-00∞∞∞∞∞∞∞∞∞∞Page 203
 201-299, 401-499, Aug 01/05 CES (2) If the warning light panels of the doors do not flash:

 - connect the connector of the cabin pressure detection pressure switch 14WN again and disconnect pin A/B of the relay 18WN1.
 (a) If the warning light panels of the doors flash:
 - connect pin A/B of the relay 18WN1 again,

 - disconnect pin A/Z of the relay 3EN2,

 - do a check for 28VDC at the relay 18WN2 pin A/X.

 1 If there is 28VDC:
_
 - do a check for ground at pin G of the connector of the warning light panel 16WN1.
 a If there is ground:
_
 - replace the RELAY-ENG2 ON/OFF (18WN2) (Ref. ASM 52-73/02).
 b If there is no ground:
_
 - repair the wiring (Ref. ASM 52-73/02) between: .the warning light panel 16WN1 pin G and the relay 18WN2 pin A/B .the relay 18WN2 pin A/3 and the ground.
 2 If there is no 28VDC:
_
 - replace the RELAY-ENG2 OIL LOW PRESS (3EN2) (Ref. ASM 79-36/01).
 a If the fault continues:
_
 - repair the wiring (Ref. ASM 52-73/02) between: .the relay 3EN2 pin A/1 and the circuit breaker 2EN2 .the relay 3EN2 pin A/A and the relay 18WN2 pin A/X.
 b If the fault continues:
_
 - connect pin A/Z of the relay 3EN2 again,

 - replace the CTL SW-ENG/MASTER 2 (2KC) (Ref. ASM 76-12/01).

 c If the fault continues:
_
 - repair the wiring (Ref. ASM 79-36/01) between: .the control switch 2KC pin 3A and the relay 3EN2 pin A/Z .the control switch 2KC pin 1A and the ground.
 (b) If the warning light panels of the doors do not flash:
 - connect pin A/B of the relay 18WN1 again,

 - disconnect pin A/Z of the relay 3EN1,

 - do a check for 28VDC at the relay 18WN1 pin A/X.

 1 If there is 28VDC:
_
 - do a check for ground at pin G of the connector of the warning light panel 16WN1.
 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1R EFF : 001-049, 051-099, 101-149, 151-199, ∞∞52-73-00∞∞∞∞∞∞∞∞∞∞Page 204
 201-299, 401-499, Aug 01/05 CES a If there is ground:

_
 - replace the RELAY-ENG1 ON/OFF (18WN1) (Ref. ASM 52-73/02).
 b If there is no ground:
_
 - repair the wiring (Ref. ASM 52-73/02) between: .the warning light panel 16WN1 pin G and the relay 18WN1 pin A/B .the relay 18WN1 pin A/3 and the ground.
 2 If there is no 28VDC:
_
 - replace the RELAY-ENG1 OIL LOW PRESS (3EN1) (Ref. ASM 79-36/01).
 a If the fault continues:
_
 - repair the wiring (Ref. ASM 52-73/02) between: .the relay 3EN1 pin A/1 and the circuit breaker 2EN1 .the relay 3EN1 pin A/A and the relay 18WN1 pin A/X.
 b If the fault continues:
_
 - connect pin A/Z of the relay 3EN1 again,

 - replace the CTL SW-ENG/MASTER 1 (3KC) (Ref. ASM 76-12/01).

 c If the fault continues:
_
 - repair the wiring (Ref. ASM 79-36/01) between: .the control switch 3KC pin 3A and the relay 3EN1 pin A/Z .the control switch 3KC pin 1A and the ground.
　
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