04/22/21
Message Overview:
Message Description:
Left engine oil chip detector/zapper fault 6.
[MCID 1020]
Oil Chip Detector/Zapper 6.
A fault in the ECU A or ECU B or the oil chip detector/zapper shared reference harness was sensed.
Possible Causes:
- Wiring Harness (W6)
- Full Authority Digital Engine Control Unit (FADEC) Electronic Control Unit A (ECU) (A41)
- Full Authority Digital Engine Control Unit (FADEC) Electronic Control Unit B (ECU) (A43)
Troubleshooting Tips:
Advisory Wire/Service Bulletin: None
Forum Articles/Infoservice/Newsletter: None
Quick Links:
| Removal of the Engine Electronic Control Unit (ECU) | AMM 76-10-05-000-801 |
| Installation of the Engine Electronic Control Unit (ECU) | AMM 76-10-05-400-801 |
| Removal of the Oil Pump | AMM 79-21-01-000-802 |
| Installation of the Oil Pump | AMM 79-21-01-400-802 |
| Removal of the Oil Filter | AMM 79-21-05-000-801 |
| Installation of the Oil Filter | AMM 79-21-05-400-801 |
| Removal of the Chip Detector | AMM 79-21-09-000-801 |
| Installation of the Chip Detector | AMM 79-21-09-400-801 |
| Removal of the Oil Filter Bypass-Indicator | AMM 79-31-01-000-802 |
| Installation of the Oil Filter Bypass-Indicator | AMM 79-31-01-400-802 |
| Removal of the Oil Temperature Transducer | AMM 79-31-05-000-801 |
| Installation of the Oil Temperature Transducer | AMM 79-31-05-400-801 |
| Removal of the Oil Pressure Transducer | AMM 79-31-09-000-801 |
| Installation of the Oil Pressure Transducer | AMM 79-31-09-400-801 |
| Removal of the Oil Level Probe | AMM 79-31-13-000-801 |
| Installation of the Oil Level Probe | AMM 79-31-13-400-801 |
| Wire Repair - Maintenance Practices - ALL | SPM 20-12-10-02 |
Troubleshooting Recommendations:
- MCID 1020 fault only is present, troubleshoot using the following steps for aircraft and engine fault isolation with reference to the Light Engine Maintenance Manual Subtask 72-00-00-810-179-A01.
- Disconnect and examine the OIL CHIP DETECTOR ZAP connector W4P10 for damaged wires and other damage. (Refer to LEMM TASK 76-10-01-050-801, Removal.)
- Measure the resistance at the chip detector as shown in the list below. The measured resistance must be 18 to 22 kΩ. If the resistance is not within the range given, replace the chip detector.
Connector Pin Reading Chip Detector 1, 2 18 to 22 kΩ - Do a internal short check as shown in the lists below. The measured resistance must be less than 5Ω. If the resistance is not within the range given, replace the chip detector.
Connector Pin Reading W4P10 1, 2 5Ω - Measure the resistance at each pin to the case of the chip detector. The measured resistance must be greater than 50 M ohms. If the resistance is not within the range given, replace the chip detector.
- Disconnect and examine the INTERFACE connector W4P1 and the INTERFACE connector W6J5 for damaged wires and other damage. (Refer to LEMM TASK 76-10-01-050-801, Removal).
- Do a continuity check as shown in the list below. No open circuits allowed.
Connector Pin Connector Pin Reading W4P10 1 W6P2 75 > 1Ω W4P10 2 W6P2 76 > 1Ω W4P10 1 W6P3 75 > 1Ω W4P10 2 W6P3 76 > 1Ω - Reconnect all the connectors. (Refer to LEMM TASK 76-10-01-450-801, Installation).
- Troubleshoot the aircraft oil chip detector circuit. (Refer to the Aircraft Maintenance Manual).
