New Holland WorkMaster 50 Service Manual page 871

DTC 226-04-Battery voltage is lower than expected
Control Module : ECU
Context:
The Engine Control Unit (ECU) A-9000 monitors the battery voltage. If the ECU A-9000 detects a voltage lower than
expected, this fault will occur.
Cause:
The ECU A-9000 has detected a battery voltage of less than 8.3 V.
Possible failure modes:
1. Faulty battery.
2. Faulty alternator, failed regulator.
3. Engine started in extreme cold conditions.
4. Faulty ECU A-9000, software.
Solution:
1. Verify fault is present and active.
Use the Electronic Service Tool (EST) to check the status of this fault.
A. If the fault is present and active, continue with Step 2.
B. If the fault is no longer present or in an inactive state, the fault may be intermittent and not currently active.
Continue with Step 6.
2. Charge the battery and perform a battery load test.
A. If the pass battery does not pass the load test, replace the battery.
B. If the battery passes the load test, continue to Step 3.
3. Start the engine and raise the Revolutions Per Minute (RPM) to about 1500 RPM for 1.00 min. Lower the RPM to
idle speed and check the battery voltage with the engine running.
With the engine running, use a multimeter to perform the following voltage check on the battery posts :
From
Battery +
A. If the voltage is low, out of range (normal engine running operating range is approximately 14.8 - 16.2 V, the
alternator has failed. Replace the alternator.
B. If the voltage is within range (normal engine running operating range is approximately 14.8 - 16.2 V, continue
to Step 4.
4. Check the ECU A-9000 voltage supply wiring.
Disconnect the vehicle harness (VE) from the ECU A-9000 at connector X-9102.
Place a jumper wire between X-9102 pin K28 and chassis ground. This will energize the main relay K-9102.
With the key in the ON position, use a multimeter to perform the following voltage check on the vehicle harness
(VE) side :
From
X-9102 pin K01
X-9102 pin K03
X-9102 pin K05
Electrical systems - FAULT CODES
To
Battery -
To
Chassis ground
Chassis ground
Chassis ground
47866583_ 02/12/2015
55.12 [55.DTC] / 150
Value
14.8 - 16.2 V
Value
There should be approximately 12 V.
There should be approximately 12 V.
There should be approximately 12 V.