New Holland Workmaster 50, Service Manual

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Electrical systems - FAULT CODES
DTC 11C-03-Water in fuel detected or water in fuel circuit failure
Control Module : ECU
NOTE: This fault code is for the Water in Fuel switch with black connector housing.
Context:
The Engine Control Unit (ECU) A-9000 monitors the voltage output from the water in fuel switch S-9102 to determine
if water is present in the fuel supply. If water is detected in the fuel, warnings will be displayed to alert the operator
of potential engine damage if operation continues. High voltage signal from the water in fuel switch S-9102 indicates
water present.
Cause:
This fault code is displayed to warn the operator that the Engine Control Unit (ECU) A-9000 has detected excess
water in the fuel system or a fault in the water in fuel switch circuit.
Possible failure modes:
1. Excess water in the fuel supply.
2. Faulty water in fuel switch S-9102, wiring or internal (mechanical and/or electrical) failure.
3. Faulty ECU A-9000, software.
Solution:
1. Verify this fault code is still present and in an active state.
Use the Easy Engine software provided on the Electronic Service Tool (EST) to check the fault status.
A. If the fault is still present and active, continue with Step 2 .
B. If the fault is no longer present or is in an inactive state, Continue with Step 7 .
2. Check fuel for water contamination.
A. If there is water contamination, continue with Step 3 .
B. If there is no water contamination, Continue with Step 4 .
3. Verify proper water in fuel switch S-9102 operation.
Purge fuel supply system, replace fuel filter(s) and refill with fuel that is free of water contamination.
Start and run engine for 5 minutes.
Check for code to return to active status.
A. If code returns in an active status, replace water in fuel switch S-9102.
B. If code remains inactive, return the machine to service.
4. Check for open, short and grounded circuit conditions in the water in fuel switch S-9102 circuit.
Disconnect the water in fuel switch S-9102 at connector X-9125 .
Disconnect the vehicle harness (VE) from the ECU A-9000 at connector X-9102 .
With the key switch in the OFF position, use a multimeter to perform the following tests, on the vehicle (VE) harness
from :
From To Value
X-9125 pin 1 X-9102 pin K88 There should be continuity.
X-9125 pin 2 Chassis ground There should be continuity.
X-9125 pin 3 X-9102 pin K01 There should be continuity.
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