Ecu Defect, Shorted To Low Source; Cx840, Cx860, Cx880 - New Holland CX720 Repair Manual

0385.4-ECU DEFECT, SHORTED TO LOW SOURCE (SERVICE TOOL
FAULT CODE 201) (B.20.A.92 - G.30.B.53)

CX840, CX860, CX880

0385.4 - ECU DEFECT, SHORTED TO LOW SOURCE (SERVICE TOOL FAULT CODE 201)
Context:
Engine disabled - fuel pump shut off.
Cause:
An error in the monitoring module.
Possible failure modes:
1. Engine ECU malfunction.
Solution:
1. Check the condition of the fuse F-01, the ECU fuse (20 Amp) and the fuse F-38, the relay K-14 and the keystart
switch fuse (7.5 Amp). Check for good connections onto the ECU and at the connectors X004 and X010. Check
the main ECU relay, K-14, for correct operation.
A. If a fuse is blown or the relay is faulty replace and check engine operation. If engine performs okay, remove
the fault code from the engine ECU memory using the electronic service tool.
B. If the fuses, relay and wiring are okay continue with step 2.
2. Attempt to reload the engine ECU software using the Electronic Service Tool.
A. If the software is accepted check engine for correct operation.
B. If the software is not accepted continue with step 3.
3. Substitute the engine ECU.
A.
Series 1348 and above
Wiring harness - Electrical schematic frame 02 (A.30.A.88-C.20.E.02)
Series 1206-1347
Wiring harness - Electrical schematic frame 03 (A.30.A.88-C.20.E.03)
Series 1206-1347
Wiring harness - Electrical schematic frame 24 (A.30.A.88-C.20.E.24)
Series 1348 and above
Wiring harness - Electrical schematic frame 29 (A.30.A.88-C.20.E.29)
POWER PRODUCTION - FUEL AND INJECTION SYSTEM
2 4/7/2006
B.20.A / 122