New Holland WorkMaster 50 Service Manual page 992

DTC 609-02-ECU internal failure - SPI chip error configuration
Control Module : ECU
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. The requests for
these listed actions are made by software and result in a configuration of the initialization register, which is hardware
controlled. The same configuration is calculated by software. If both configurations are not identical, the SPI is not
plausible and 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).
Solution:
1. Check the ECU A-9000 for the appropriate software and re-flash, if necessary.
A. If the fault has been resolved, return the machine to service.
B. If the fault has not been resolved, escalate an ASIST concern.
Electrical systems - FAULT CODES
47866583_ 02/12/2015
55.12 [55.DTC] / 271