Case 580SR Service Manual page 341

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FAULT CODE F5 AND F6 / OPEN CIRCUIT

DIRECTION OUTPUTS

Direction selection related outputs (E06-Pin P,

A short to plus is considered as a critical fault. Shorts

to plus usually result in being blocked in either For-

ward or Reverse. If both are on simultaneously, the

transmission Behaviour depends on the state of a

mechanical interlock inside the transmission.

In this case the Microprocessor normally turns on

the pressure modulator (E03-Pin T). This results in

immediate selection of neutral regardless of the ori-

gin of the fault. Indeed even in case the short to plus

is applied externally, this response effectively blocks

the transmission in neutral.

If however at the time the fault was detected a fault

was also present on the pressure modulator, the mi-

croprocessor reverts to shutdown mode and re-

mains this way until power is removed. Shutdown

mode is a state in which power is removed from the

microprocessor outputs by opening the internal re-

dundant shutdown path.

This only helps if the fault was caused by the micro-

processor internally.

Additionally, during program execution, critical vari-

ables are continuously checked for contents integri-

low/high solenoid:

inactive = forward high is selected

active = forward low is selected

SECTION 21 - TRANSMISSION

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