New Holland WorkMaster 50 Service Manual page 997

DTC 60B-04-Lambda sensor cell circuits short circuit to ground
Control Module : ECU
NOTE: If the Lambda sensor B-9123 is replaced, it is necessary to perform the Replacement of the Lambda Sensor
- Reset ECU Data with the Electronic Service Tool (EST) before you return the machine to service. See Lambda
sensor - Configure - Reset ECU data (Lambda sensor) (55.989), if necessary.
Context:
The Engine Control Unit (ECU) A-9000 monitors the condition of the Lambda sensor B-9123 nernst cell, pump cell
and virtual ground circuits. If the ECU A-9000 detects a short to ground in any of the circuits, this fault will occur.
For information regarding the functional operation of the Lambda sensor B-9123 see Lambda sensor - Overview
(55.989). For information regarding the technical specifications of the lambda sensor B-9123, see Lambda sensor -
Technical Data (55.989).
Cause:
The ECU A-9000 is sensing a short to ground condition in the Lambda sensor B-9123 nernst cell, pump cell or virtual
ground circuit.
Possible failure modes:
1. Faulty Lambda sensor B-9123 circuit wiring, short to ground condition.
2. Faulty Lambda sensor B-9123, internal failure.
3. Faulty ECU A-9000, software.
Solution:
1. Verify that the fault 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 4.
2. Check the Lambda sensor B-9123 circuit wiring for a short to ground condition.
Disconnect the vehicle harness (VE) from the Lambda sensor B-9123 at connector X-9123.
Disconnect the vehicle harness (VE) from the ECU A-9000 at connector X-9102.
With the key in the OFF position, use a multimeter to perform the following continuity check on the vehicle harness
(VE) side :
From
X-9123 pin 1
X-9123 pin 2
X-9123 pin 6
A. If there is continuity on any of the checks, there is a short to ground condition in the lambda sensor B-9123
vehicle harness (VE) wiring. Use the appropriate service manual, if necessary, to locate and repair the shorted
conductor.
B. If there is no continuity on any of the checks, leave connector X-9123 disconnected and continue to Step 3.
3. Replace the Lambda sensor B-9123.
Use the EST, see Lambda sensor - Configure - Reset ECU data (Lambda sensor) (55.989) if necessary, to
perform the Replacement of the Lambda Sensor - Reset ECU Data.
Use EST to check to see that this fault has been resolved.
Electrical systems - FAULT CODES
To
chassis ground
chassis ground
chassis ground
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55.12 [55.DTC] / 276
Result
There should be no continuity.
There should be no continuity.
There should be no continuity.