Ac cess thru the firewall is re quired, for the plugs and the flanges X4 and X8 to lay the ECU ca b le
loom. The plugs and the flanges X4 and X8 are at tached to the firewall. Each con nec tor needs 4
bolts M4x15 mm, wash ers and nuts.
5.3.2.2 Connection of the wiring loom
The ca bles for the en gine are di vided into three ca ble looms:
• ca ble loom, ECU (in cock pit)
•
ca ble loom, en gine
•
ca ble loom, ig ni tion.
Con nect the ground con nec tion for the elec tro-magnetic shield (EMS). The ca ble loom, en gine, is
con nected to the ca ble loom, ECU, at the firewall. The ca ble loom has a pro nounced hang near
X4 to pre vent wa ter, due to con den sa tion, from run ning into the plug (“wa ter sack“). The sub se
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quent rout ing of the ca ble loom must be made such, that it is not par al lel to the ca ble loom, ig ni
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tion. Con nect the ca ble loom to the ap pro pri ate sen sors, ig ni tion noz zles and the wa ter-loss
con tact on the ex pan sion ves sel. Con nect the ground con nec tion for the EMS. The ca ble loom, ig
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ni tion, is to be as sem bled in ac cor dance with the des ig na tions.
The ECU, mounted on the in stru ment panel on the con sole, is con nected to the plug X1. There
must be no col lec tion of hot air or heat ing.
The ca ble looms, MCU and ECU, should be eas ily de tach able. The ca ble loom, ECU, is con
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nected to the emer gency switch, which is mounted in the in stru ment panel, by the plug X6. The
fuel pumps are con nected by the plug X9.
A re li able ON/OFF switch for the en gine elec tri cal power is mounted in the in stru ment panel and
is con nected by the con tacts pro vided to the plug X7. The LED’s for the sta tus of the emer gency
are con nected to the plug X7 if in stru ment 250.215.025 000 is not used. The plug X7 also pro -
vides fur ther out puts for the in stru ments.
5.3.2.3
Connection of the Relay-box (MCU)
The elec tri cal power for the en gine electrics is sup plied thru the re lay-box (MCU).
• (+)emer gency batt. ter mi nal to the emer gency bat tery
•
(+)main batt. ter mi nal to the main re lay K1 and main cir cuit breaker FH
•
(-) ter mi nal = GND to (-) of the main bat tery
Keep the ca bles as short as pos si ble. The fuses for the en gine are in the re lay-box (MCU).
5.3.2.4 MCU- test
It is pos si ble to carry out the fol low ing test for cor rect MCU-connection:
•
Set the me ter (e.g. Voltkraft M3850D) to di ode test +=
• At tach the neg a tive (-) ter mi nal on the me ter to the emer gency bat tery (+), the pos i tive (+) ter -
mi nal on the me ter to the main bat tery (+)
=>Dis play: ap prox i mately 200mV
•
At tach the pos i tive (+) ter mi nal on the me ter to the emer gency bat tery (+), the neg a tive (-) ter
-
mi nal on the me ter to the main bat tery (+)
=>No dis play, over load (OL)
5.3.2.5 MCU and emergency battery test
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