Eeprom Check Sum Def Mem, Shorted To High Source - New Holland CX720 Repair Manual

0453.3-EEPROM CHECK SUM DEF MEM, SHORTED TO HIGH
SOURCE (SERVICE TOOL FAULT CODE 195) (B.20.A.92 - G.30.B.54)
CX840
0453.3 - EEPROM CHECK SUM DEF MEM, SHORTED TO HIGH SOURCE (SERVICE TOOL FAULT CODE 195)
Context:
Engine Disabled - Fuel pump shut off
Cause:
Engine ECU fault
Possible failure modes:
1. Engine ECU main relay (K-14) faulty
2. Engine ECU fault
Solution:
1. Check fuses F-1 and F-38.
A. Replace fuse If blown. Remove the fault code from the engine ECU memory using the electronic service
tool and check the operation of the engine. If fuse blows again inspect wiring harness for damage.
B. If fuses are okay continue with step 2.
2. Check the Main Relay (K-14).
A. Remove the relay and check its operation. If okay continue with step 3.
B. Replace the relay if faulty. Remove the fault code from the engine ECU memory using the electronic
service tool. Operate the engine, if the fault reoccurs continue with step 3.
3. Check the wiring harness.
A. Remove relay K-14 and check for continuity of the wiring between the engine ECU connector X193 and the
relay 14 holder. Check between pin 2 of the holder and pin 27 of X193 and between pin 5 of the holder and
pins 3 and 4 of X193. If an open circuit is indicated at any stage repair or replace the wiring as required.
B. If continuity is good continue with step 4.
4. Replace 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 / 199