New Holland WorkMaster 50 Service Manual page 995

DTC 60B-03-Lambda sensor cell circuits short circuit to battery
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 nernst cell, pump cell and virtual ground circuits.
If the ECU A-9000 detects a short to a voltage source condition in any of the circuits or an open circuit condition in
the virtual ground circuit, this fault will occur. For information regarding the functional operation of the Lambda sensor
B-9123 see Lambda sensor - Overview (55.989). For more 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 an open circuit condition in the Lambda sensor B-9123 virtual ground circuit or a short to
a voltage source condition in the nernst cell, pump cell or virtual ground circuit.
Possible failure modes:
1. Faulty Lambda sensor B-9123 nernst cell, pump cell, or virtual ground circuit wiring, short to a voltage source.
2. Faulty Lambda sensor B-9123 virtual ground circuit wiring, open circuit.
3. Faulty Lambda sensor B-9123, internal failure.
4. 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 5.
2. Check the Lambda sensor B-9123 nernst cell, pump cell, and virtual ground circuit wiring for a short to voltage
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 switch in the OFF position, use a multimeter to perform the following continuity check on the vehicle
harness (VE) side :
From
X-9102 pin K64
X-9102 pin K85
X-9102 pin K63
X-9102 pin K86
With the key switch in the ON position, use a multimeter to perform the following voltage check on the vehicle
harness (VE) side :
From
X-9102 pin K64
X-9102 pin K85
X-9102 pin K63
X-9102 pin K86
Electrical systems - FAULT CODES
To
all pins in connector X-9102.
all pins in connector X-9102.
all pins in connector X-9102.
all pins in connector X-9102.
To
chassis ground
chassis ground
chassis ground
chassis ground
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55.12 [55.DTC] / 274
Result
There should be no continuity.
There should be no continuity.
There should be no continuity.
There should be no continuity.
Result
There should be no voltage.
There should be no voltage.
There should be no voltage.
There should be no voltage.