Cylinder 4, Data Incorrect (Service Tool Fault Code Xxx); Cx860, Cx880 - New Holland CX720 Repair Manual

0415.2-CYLINDER 4, DATA INCORRECT (SERVICE TOOL FAULT
CODE XXX) (B.20.A.92 - G.30.C.10)

CX860, CX880

0415.2 - CYLINDER 4, DATA INCORRECT (SERVICE TOOL FAULT CODE XXX)

Context:
Engine speed restricted and only operating on 5 cylinders
Cause:
Injection circuit fault
Possible failure modes:
1. Faulty injector
2. Wiring fault between injector and engine ECU.
Solution:
1. Check the connector at the Injector.
A. Ensure the connector is not damaged, the terminals are in the correct position in the housing, and that the
fit is tight on the injector.
NOTE : The separate injector harness assembly is specially constructed to avoid interference from elec-
tromagnetic sources, therefore no repairs should be attempted on this harness. If the connector or wiring
is damaged it will be necessary to replace the complete injector harness assembly.
B. If the connector is okay continue with step 2.
2. Check the injector.
A. With the connector removed, measure the resistance across the injector coil terminals. The resistance
should be 0.56 - 0.57 Ω. If the coil is outside the range or indicates either a short or open circuit, replace
the injector assembly.
B. If the injector is okay continue with step 3.
3. Check the wiring between the injector and Engine ECU.
NOTE : A common positive is supplied to groups of three injectors. Injectors for cylinders 1, 2 and 3 are supplied
from pin 24 of X192 (engine ECU) and injectors for cylinders4, 5 and 6 are supplied from pin 25 of X192 (engine
ECU).
A. Disconnect the injector harness and engine ECU connector X192. Using a suitable multi-meter check the
injector control wiring between pin G of the injector harness connector and pin 26 of X192, engine ECU.
Check the wiring for continuity and short to ground. Repair/replace the wiring if a fault is found. If no fault
is found continue with step B
B. Reconnect connector X192 to the engine ECU. With the keystart ON (not cranking), check for a short to
+12 V at pin G of the injector harness connector. If a short to +12 V is indicated trace the fault and repair
the wiring as required. If +12 V does not exist continue with step C.
C. With the keystart OFF, check the wiring on the separate injector harness assembly. Using a suitable multi-
meter check across pins G and H, with the injector still connected, the resistance should be approximately
0.56 - 0.57 Ω. Having previously eliminated the injector coil, if an open or short circuit is indicated the fault
is in the harness. Replace the harness.
POWER PRODUCTION - FUEL AND INJECTION SYSTEM
2 4/7/2006
B.20.A / 138