New Holland WorkMaster 50 Service Manual page 993

DTC 60A-04-Lambda sensor heater battery voltage too low
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 SPI chip, which is internal to the ECU A-9000, controls the Lambda sensor B-9123 device for the measuring or
the calibrating of the inner resistance for temperature evaluation, switches on and off the pump current to measure O2
content and monitors the hardware related to the open load and short circuit monitoring devices. If the SPI chip senses
a very low battery voltage, less than 9.0 V 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 has sensed low voltage in the lambda sensor circuit.
Possible failure modes:
1. Low battery voltage.
2. Faulty Lambda sensor B-9123 supply circuit wiring.
3. Faulty Lambda sensor B-9123, failed internally.
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 for fault codes related to low battery voltage.
A. If fault codes are active for low battery voltage, correct other active fault codes first.
B. If the battery voltage is within specification, continue with Step 3.
NOTE: Normal battery voltage for a 12.0 V system is approximately 10.0 - 12.5 V. The low voltage fault range may
vary by product.
3. Check the Lambda sensor B-9123 heater 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 switch in the ON position, use a multimeter to check for voltage on the vehicle harness (VE) side :
From
X-9123 pin 4
A. If the voltage reading is incorrect, check the wiring harness between connector X-9123 pin 4, and the Main
relay K-9102 cavity X-9129.
B. If the voltage reading is correct, continue with Step 4.
4. Replace the Lambda sensor B-9123.
Electrical systems - FAULT CODES
To
chassis ground
47866583_ 02/12/2015
55.12 [55.DTC] / 272
Result
There should be approximately
12.0 V.