New Holland Workmaster 50, Service Manual

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Electrical systems - FAULT CODES
DTC 60C-04-Lambda sensor estimated temperature lower than
threshold
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 internal resistance of the nernst cell to estimate the internal
temperature of the Lambda sensor B-9123. If the ECU A-9000 calculates the internal temperature to be equal to or
less than
719.96 °C ( 1327.9 °F ), 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 calculated temperature, based on inner resistance, of the Lambda sensor B-9123 is below or equal
to
719.96 °C ( 1327.9 °F ).
Possible failure modes:
1. Faulty Lambda sensor B-9123 nernst cell or virtual ground circuit wiring, open circuit.
2. Faulty Lambda sensor B-9123, failed internally.
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 nernst cell and virtual ground circuit wiring for an open circuit condition.
Disconnect the vehicle harness (VE) from the Lambda sensor B-9123 at connector X-9123 .
With the key in the OFF position, use a multimeter to check for continuity on the vehicle harness (VE) side :
From To Value
X-9123 pin 2 X-9102 pin K85 There should be continuity.
X-9123 pin 6 X-9102 pin K63 There should be continuity.
A. If there is no continuity, there is an open circuit in the Lambda sensor B-9123 nernst cell or virtual ground
circuit wiring in the vehicle harness (VE). Use the appropriate vehicle service manual, if necessary, to locate
and repair the broken conductor.
B. If there is continuity on both checks, continue with Step 3 .
3. Replace the Lambda sensor B-9123.
Use EST to check to see that this fault has been resolved.
A. If the fault has been resolved, return the machine to service.
B. If this fault has not been resolved, check the ECU A-9000 for the appropriate software and re-flash, if necessary.
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