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| Illustration 1 | g00727851 |
Block diagram of the transmission/chassis ECM | |
The Transmission/Chassis ECM determines the desired transmission gear. This is accomplished by energizing solenoids in order to shift the transmission gears. This is based on information from the operator and the machine.
The Transmission/Chassis ECM receives information (electrical signals) from various input components:
- Shift lever switch
- Transmission Output Speed sensor (TOS)
- Transmission gear switch
- Body up switch
- Hoist lever sensor
The input information from the Transmission/Chassis ECM will determine when the transmission should upshift. The input information will determine when the transmission should downshift. This information is also used to engage the lockup clutch. The ECM also limits the transmission gear that is selected. These actions are accomplished by sending electrical signals to various output components.
- Upshift solenoid
- Downshift solenoid
- Lockup solenoid
- Backup alarm
The Transmission/Chassis ECM is used to control the hoist system and the secondary steering system.
The Electronic Technician Service Tool (ET) can be used to perform several diagnostic functions and programming functions.
Diagnostic functions and programming functions that can be performed by the service tool are listed.
- Display the real time status of the input parameters and the output parameters.
- Display the internal clock hour reading.
- Display the number of occurrences, and the hour reading of the first occurrence and the last occurrence for each logged diagnostic code and logged event.
- Display the definition for each logged diagnostic code and each logged event.
- Display load counters.
- Display the lockup clutch engagement counter.
- Display the transmission gear shift counter.
- Program the top gear limit and the body up gear limit.
- Load new Flash files.