- repair the above wiring.

 (2) If the wiring is correct:

 - with the cable disconnected from the EVMU (2EV), do a resistance check of the EVMU between: pins 7C and 8D (40 to 80 Ohms).
 (a) If the resistance values are in the specified limits:
 - replace the EVMU (2EV), (Ref. AMM TASK 77-32-34-000-042) and (Ref. AMM TASK 77-32-34-400-042).
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 (b) If the resistance values are out of the specified limits: R - with the connector CC disconnected from the N2 speed sensor, do R a resistance check of the sensor between:
 . pins 1 and 2 (40 to 80 Ohms) . pins 1 and 3 (> 10 Megohms) . pin 1 and the ground (> 10 Megohms)
 1 If the resistance values are out of the specified limits:
_
 - replace the SENSOR-N2 ROTATIONAL SPD (4001EV), (Ref. AMM TASK 77-11-20-000-002) and (Ref. AMM TASK 77-11-20-400-002).
 2 If the resistance values are in the specified limits:
_
 - replace the harness between the EVMU and the N2 speed sensor (Ref. ASM 77-32/02).
 B. Do the vibration check to get the vibration data (Ref. AMM TASK 71-00-00-710-009).
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 TASK 77-30-00-810-808
 Loss of the N2 Vibration Indication on Engine 2
 1. Possible Causes
_______________
 - EVMU (2EV)

 - wiring from the EVMU (2EV) to the N2 speed sensor (4001EV)

 - SENSOR-N2 ROTATIONAL SPD (4001EV)

 - harness between the EVMU and the N2 speed sensor

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------
REFERENCE DESIGNATION
 -------------------------------------------------------------------------------
AMM 71-00-00-710-009 Vibration Check
 AMM 77-11-20-000-002 Removal of the N2 Speed Sensor (4001EV).
 AMM 77-11-20-400-002 Installation of the N2 Speed Sensor (4001EV).
 AMM 77-32-34-000-042 Removal of the Engine Vibration Monitoring Unit

 (EVMU) AMM 77-32-34-400-042 Installation of the Engine Vibration Monitoring Unit (EVMU) ASM 77-32/02
 3. Fault Confirmation
__________________
 A. Test
 Not applicable, you cannot confirm this fault on the ground.

 4. Fault Isolation
_______________
 A. If the Post Flight Report gives the maintenance message ENG2 N2 SPEED
 SENSOR:
R - do a check for open or short to ground of the wiring from the EVMU
R (2EV) to the N2 speed sensor (4001EV) pins AB/8D, 7C to pins CC/1, 2
 (Ref. ASM 77-32/02).
 (1) If the wiring is not correct:

 - repair the above wiring.

 (2) If the wiring is correct:

 - with the cable disconnected from the EVMU (2EV), do a resistance check of the EVMU between: pins 7C and 8D (40 to 80 Ohms).
 (a) If the resistance values are in the specified limits:
 - replace the EVMU (2EV), (Ref. AMM TASK 77-32-34-000-042) and (Ref. AMM TASK 77-32-34-400-042).
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 (b) If the resistance values are out of the specified limits: R - with the connector CC disconnected from the N2 speed sensor, do R a resistance check of the sensor between:
 . pins 1 and 2 (40 to 80 Ohms) . pins 1 and 3 (> 10 Megohms) . pin 1 and the ground (> 10 Megohms)
 1 If the resistance values are out of the specified limits:
_
 - replace the SENSOR-N2 ROTATIONAL SPD (4001EV) (Ref. AMM TASK 77-11-20-000-002) and (Ref. AMM TASK 77-11-20-400-002).
 2 If the resistance values are in the specified limits:
_
 - replace the harness between the EVMU and the N2 speed sensor (Ref. ASM 77-32/02).
 B. Do the vibration check to get the vibration data (Ref. AMM TASK 71-00-00-710-009).
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