TH31-C9I, TH31-C9P, TH31-C9T, TH35-C11I, TH35-C13I, TH35-C13T, TH35-C15I and TH35-C15T Petroleum Power Train Packages and TH31-E61 and TH35-E81 Petroleum Transmissions Power Train Electronic Control System Caterpillar

Data Link

Usage:

J1939 Data Link

A J1939 compliant data link shall be provided for communication with engines and transmissions as well as instrument clusters and other devices that use this communications protocol.

The messages detailed below shall be supported.

The following table depicts the receive list:

Show/hide table

Table 1
J1939 PGNs for TH31 and TH35
PGN	PGN Abbr	Description	Source	Contents
0	TSC1	Torque / Speed Control 1	Engine	Torque / Speed limit
0	TSC1	Torque/Speed Control 1	Transmission	Torque / Speed limit
256	TC1	Transmission Controller 1	all	Req Gear, Transmission modes
256	TC1	Transmission Controller 1	Transmission	Requested Gear
57344	CM1	Cab Message 1	Transmission	Req Fan speed
61440	ERC1	Electronic Retarder Controller 1	all	Retarder Mode, % torque
61440	ERC1	Electronic Retarder Controller 1	Transmission	Retarder Mode, % torque
61441	EBC1	Engine Brake Controller 1	brake controller	ABS
61442	ETC1	Electronic Transmission Controller 1	Transmission	Shift In Progress, Trans Speeds
61443	EEC2	Electronic Engine Controller #2	Engine	Accel pedal
61444	EEC1	Electronic Engine Controller #1	Engine	Engine Speed, Torque %
61444	EEC1	Electronic Engine Controller 1	Transmission	Engine speed (Measured by the Transmission)
61445	ETC2	Electronic Transmission Controller 2	Transmission	Actual Gear & Display characters
64917	TRF2	Transmission Fluids 2	Transmission	TC Oil Temp
64965	ECUID	ECU Identification Information	Transmission	ECU Part #s
65088	LD	Lighting Data	Transmission	Backup Alarm Light / Horn
65098	ETC7	Electronic Transmission Controller 7	Transmission	Blank/Flash Characters. Active Shifter
65195	ETC6	Electronic Transmission Controller 6	Transmission	Highest/Lowest Gear
65226	dm1	Diagnostic Message 1	Transmission	Active Diagnostics
65227	dm2	Diagnostic Message 2	Transmission	Previously Active Diagnostics Codes
65228	dm3	Diagnostic Message 3	all	Diagnostic Data Clear/Reset of Previously Active
65242	SOFT	Software Identification	Transmission	Software ID
65247	EEC3	Electronic Engine Controller #3	Engine	Nominal Friction & Parasitic Losses
65249	RC	Retarder Configuration	Engine	Retarder Speeds, Retarder Reference Torque
65250	TCFG	Transmisson Configuration	Transmission	Number of Gears, Gear Ratios
65251	EC1	Engine Configuration 1	Engine	Ref Torque, Low idle speed
65255	VH	Vehicle Hours	Transmission	Vehicle Hours
65259	CI	Component Identification	primary shifter	Make, Model
65260	VI	Vehicle Identification	Transmission	Vehicle ID
65261	CCSS	Cruise Control / Vehicle Speed Setup	Engine	Max Vehicle Speed, Cruise Control Limits
65265	CCVS	Cruise Control / Vehicle Speed	Engine	Brake Switch, Wheel Based Speed, Park Brake Switch
65265	CCVS	Cruise Control / Vehicle Speed	Transmission	Brake Switch, Wheel Based Speed, Park Brake Switch
65271	VEP1	Vehicle Electric Power	Transmission	Battery Potential
65272	TRF1	Transmission Fluids 1	Transmission	Oil Temp, Oil Level measurements
65274	B	Brakes	Transmission	Brake Pressure
65275	RF	Retarder Fluids	Transmission	Retarder Oil Temperature

The following table depicts the transmit list:

The J1939 Data Link provides a method by which the transmission can limit speed/torque of engine or do a speed override of the engine.

Using the J1939 Data Link, the transmission can send messages to the engine to limit the torque output of the engine during a shift. This is needed for protecting the transmission mechanical parts and used to improve the shift quality.

Note: The bus loads for the J1939 Data Link may exceed 50% when additional components are attempting to send messages across the data link. The communication between the engine and the transmission may become unreliable when the bus load exceeds 50%. In this event, the result is an erratic engine response.

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