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

Electronic Control Unit

Usage:

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Table 1
Pin Functions for the Electronic Control Module (ECM)
Position	Signal	Without Drop Box	With Drop Box
J1- 1	Key Switch	Key Switch (key in ON position)	Key Switch (key in ON position)
J1- 2	Passive Frequency 1+	Engine Speed Sensor +	Engine Speed Sensor +
J1- 3	Passive Frequency 1-	Engine Speed Sensor -	Engine Speed Sensor -
J1- 4	Passive Frequency 2+	Converter Output Speed +	Converter Output Speed +
J1- 5	Passive Frequency 2-	Converter Output Speed -	Converter Output Speed -
J1- 6	Passive Frequency 3+	Transmission Output Speed A+	Transmission Output Speed A+
J1- 7	Passive Frequency 3-	Transmission Output Speed A-	Transmission Output Speed A-
J1- 8	Passive Frequency 4+	Transmission Output Speed B+	Transmission Output Speed B+
J1- 9	Passive Frequency 4-	Transmission Output Speed B-	Transmission Output Speed B-
J1-10	CAT Data Link +	CAT Data Link +	CAT Data Link +
J1-11	Sensor Supply	+5V Sensor Supply	+5V Sensor Supply
J1-12	On/Off Driver (Fast) 6	Unused	Unused
J1-13	Power	Battery- (ground)	Battery- (ground)
J1-14	Switch To Battery 1	Unused	Unused
J1-15	Passive Frequency 5+	Unused	Front Wheel Drive Dropbox Disconnect Speed (+)
J1-16	Passive Frequency 5-	Unused	Front Wheel Drive Dropbox Disconnect Speed (-)
J1-17	Passive Frequency 6+	Unused	Rear Wheel Drive Dropbox Disconnect Speed (+)
J1-18	Passive Frequency 6-	Unused	Rear Wheel Drive Dropbox Disconnect Speed (-)
J1-19	CAN Data Link (Shield)	Unused	Unused
J1-20	CAT Data Link -	CAT Data Link -	CAT Data Link -
J1-21	Sensor Supply Return	+5V Sensor Supply Return	+5V Sensor Supply Return
J1-22	Analog (Passive) 1	Unused	Unused
J1-23	Power	Battery- (ground)	Battery- (ground)
J1-24	Switch To Battery 2	Unused	Unused
J1-25	Switch To Battery 3	Unused	Unused
J1-26	Switch To Ground 1	Unused	Unused
J1-27	Switch To Ground 2	Unused	Unused
J1-28	Switch To Ground 3	Unused	Unused
J1-29	Analog (Passive) 2	Unused	Unused
J1-30	Analog (Passive) 3	Unused	Unused
J1-31	Power	Battery+	Battery+
J1-32	Switch To Ground 4	Unused	Unused
J1-33	Switch To Ground 5	Unused	Unused
J1-34	Switch To Ground 6	Unused	Unused
J1-35	Switch To Ground 7	Unused	Unused
J1-36	Analog (Active) 1	Unused	Unused
J1-37	Analog (Active) 2	Unused	Unused
J1-38	Power	Battery+	Battery+
J1-39	Power	Battery+	Battery+
J1-40	Switch To Ground 8	Unused	Unused
J1-41	Switch To Ground 9	Unused	Unused
J1-42	Switch To Ground 10	Unused	Unused
J1-43	Switch To Ground 11	Quick to Neutral	Quick to Neutral
J1-44	Sensor Supply	+8V Sensor Supply	+8V Sensor Supply
J1-45	Sensor Supply Return	+8V Sensor Supply Return	+8V Sensor Supply Return
J1-46	Power	Battery+	Battery+
J1-47	Power	Battery+	Battery+
J1-48	Proportional Driver 1	Transmission Solenoid 6	Transmission Solenoid 6
J1-49	Proportional Driver 2	Transmission Solenoid 2	Transmission Solenoid 2
J1-50	Solenoid Return	Proportional Drivers 1- 4 Solenoid Return	Proportional Drivers 1- 4 Solenoid Return
J1-51	Proportional Driver 3	Transmission Solenoid 3	Transmission Solenoid 3
J1-52	Proportional Driver 4	Transmission Solenoid 4	Transmission Solenoid 4
J1-53	Analog (Passive) 4	Unused	Unused
J1-54	2 Wire Driver Return	Unused	Unused
J1-55	Solenoid Return	Proportional Drivers 9-12 Solenoid Return	Proportional Drivers 9-12 Solenoid Return
J1-56	Power	Battery- (ground)	Battery- (ground)
J1-57	Power	Battery- (ground)	Battery- (ground)
J1-58	Proportional Driver 5	Transmission Solenoid 5	Transmission Solenoid 5
J1-59	Proportional Driver 6	Transmission Solenoid 1	Transmission Solenoid 1
J1-60	Solenoid Return	Proportional Drivers 5- 8 Solenoid Return	Proportional Drivers 5- 8 Solenoid Return
J1-61	Proportional Driver 7	Unused	Unused
J1-62	Proportional Driver 8	Lockup Clutch Solenoid	Lockup Clutch Solenoid
J1-63	Switch To Ground 12	Transmission Filter Bypass Switch	Transmission Filter Bypass Switch
J1-64	Switch To Ground 13	Unused	Unused
J1-65	Proportional Driver 9	Unused	Work Mode Dropbox Engage Solenoid/PTO Solenoid #1
J1-66	Proportional Driver 10	Unused	Work Mode Dropbox Disengage Solenoid/PTO Solenoid #2
J1-67	Prop Driver (2 wire) 11	Unused	Rear Wheel Drive Dropbox Engage Solenoid
J1-68	Prop Driver (2 wire) 12	Unused	Rear Wheel Drive Dropbox Disengage Solenoid
J1-69	Sensor Supply	+10V Sensor Supply	+10V Sensor Supply
J1-70	Power	Battery- (ground)	Battery- (ground)
J2- 1	Switch To Battery 4 *	Key Start (key in CRANK position)	Key Start (key in CRANK position)
J2- 2	On/Off Driver 1	Unused	Front Wheel Drive Dropbox Engage Solenoid
J2- 3	On/Off Driver (Fast) 2	Unused	Unused
J2- 4	Solenoid Return 1	Unused	Unused
J2- 5	On/Off Driver 3	Backup Alarm	Backup Alarm
J2- 6	On/Off Driver 4	Unused	Front Wheel Drive Dropbox Disengage Solenoid
J2- 7	On/Off Driver (Neutral) 5	Start Relay	Start Relay
J2- 8	Solenoid Return 2	Unused	Unused
J2- 9	Sinking Driver 1	Powertrain Warning Output (Reserved)	Powertrain Warning Output (Reserved)
J2-10	Sinking Driver 2	Unused	Unused
J2-11	Sinking Driver 3	Unused	Unused
J2-12	Sinking Driver 4	Primary Shifter Indicator	Primary Shifter Indicator
J2-13	Sinking Driver 5	Secondarry Shifer Indicator	Secondarry Shifer Indicator
J2-14	R Terminal	Unused	Unused
J2-15	Active Timer 1	Unused	Unused
J2-16	Active Timer 2	Unused	Unused
J2-17	Active Timer 3	Unused	Unused
J2-18	Active Timer 4	Unused	Unused
J2-19	Sinking Driver 6	Output Speed Driver	Output Speed Driver
J2-20	Sinking Driver 7	TC Output Speed Driver	TC Output Speed Driver
J2-21	Sinking Driver 8	LUC Indicator	LUC Indicator
J2-22	Sensor/Driver Return	Ground	Ground
J2-23	Switch To Ground 14	Lockup Clutch Disable Switch (Normally Closed)	Lockup Clutch Disable Switch (Normally Closed)
J2-24	Active Timer 5	Torque Converter Oil Temperature Sensor	Torque Converter Oil Temperature Sensor
J2-25	Active Timer 6	Transmission Oil Temperature Sensor	Transmission Oil Temperature Sensor
J2-26	Active Timer 7	Unused	Rear Wheel Drive Dropbox Fork Position
J2-27	Active Timer 8	Shift Lever PWM input	Shift Lever PWM input
J2-28	Switch To Ground 15	Unused	Unused
J2-29	Switch To Ground 16	Park Brake Pressure Switch	Park Brake Pressure Switch
J2-30	Switch To Ground 17	PTO #1 Enable	PTO #1 Enable
J2-31	Switch To Ground 18	PTO #2 Enable	PTO #2 Enable
J2-32	Active Timer 9	Unused	Front Wheel Drive Dropbox Fork Position
J2-33	Active Timer 10	Unused	Work Mode Dropbox Fork Position
J2-34	Active Timer 11	Unused	Unused
J2-35	Active Timer 12	Shifter Selector Switch	Shifter Selector Switch
J2-36	Switch To Ground 19	Service Brake Pressure Switch	Service Brake Pressure Switch
J2-37	Switch To Ground 20	PTO #1 Increment	PTO #1 Increment
J2-38	Switch To Ground 21	PTO #1 Decrement	PTO #1 Decrement
J2-39	Switch To Ground 22	Unused	Unused
J2-40	Active Timer 13	Unused	Unused
J2-41	Active Timer 14	Unused	Unused
J2-42	Active Timer 15	Unused	Unused
J2-43	Active Timer 16	Unused	Unused
J2-44	Switch To Ground 23	Unused	Unused
J2-45	Switch To Ground 24	Unused	Unused
J2-46	Switch To Ground 25	PTO #2 Increment	PTO #2 Increment
J2-47	Switch To Ground 26	PTO #2 Decrement	PTO #2 Decrement
J2-48	Active Timer 17	Unused	Unused
J2-49	Active Timer 18	Unused	Unused
J2-50	Active Timer 19	Unused	Unused
J2-51	Active Timer 20	Unused	Unused
J2-52	Switch To Ground 27	Unused	Unused
J2-53	Switch To Ground 28	Unused	Unused
J2-54	Switch To Ground 29	Alternate Max Gear Select (Secondary Shifter)	Alternate Max Gear Select (Secondary Shifter)
J2-55	Switch To Ground 30	Unused	Unused
J2-56	CAN Data Link (High)	Unused	Unused
J2-57	CAN Data Link (Shield)	Unused	Unused
J2-58	Switch To Ground 31	Unused	Unused
J2-59	Switch To Ground 32	Unused	Unused
J2-60	Switch To Ground 33	Alternate Max Gear Select (Primary Shifter)	Alternate Max Gear Select (Primary Shifter)
J2-61	Switch To Ground 34	Lockup Clutch Disable Switch (Normally Open)	Lockup Clutch Disable Switch (Normally Open)
J2-62	Switch To Ground 35	Unused	Dropbox FWD Switch
J2-63	Sensor/Driver Return	Ground	Ground
J2-64	CAN Data Link (High)	Unused	Unused
J2-65	CAN Data Link (Low)	Unused	Unused
J2-66	CAN Data Link (Shield)	Unused	Unused
J2-67	CAN Data Link (High)	CAN A Data Link (High)	CAN A Data Link (High)
J2-68	CAN Data Link (Low)	CAN A Data Link (Low)	CAN A Data Link (Low)
J2-69	CAN Data Link (Shield)	CAN A Data Link (Shield)	CAN A Data Link (Shield)
J2-70	CAN Data Link (Low)	Unused	Unused

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Illustration 1	g01302128
(1) Connector J2 (2) Connector J1

Decisions are made by the circuits in the electronic control module. Software in the electronic control module activates the electronic circuits in the appropriate way to correctly operate the machine. Connectors join the harness wiring to the inputs and outputs of the electronic control module. There are two connectors with 70 contacts. Complete diagnostic codes are available with the Caterpillar Electronic Technician (ET).

The electronic control module monitors the condition of the machine for proper system operation. Components sense the condition of the machine. Components then send electrical signals to the inputs of the electronic control unit. The ECM compares the information from the inputs to the stored information. The electronic control module then decides if outputs should be activated. The activation is performed by sending electrical signals through the outputs to an electronic circuit.