980M and 982M Wheel Loaders Power Train, Steering, Braking, Hydraulic, and Machine Systems Caterpillar


Electronic Control (Power Train System)

Usage:

982M F9A


Electronic Control Module (ECM)

ECM



Illustration 1g03032197
(1) Connector view from ECM side
(2) Connector view from harness side

The transmission ECM processes information based on input information and memory information. After the ECM receives the input information, the ECM sends a corresponding response to the outputs. The inputs and outputs of the ECM are connected to the machine harness by two 70 contact connectors (J1 and J2). The inputs and outputs to the ECM can be viewed through the Caterpillar Electronic Technician (Cat ET).

Note: Only the complete ECM is serviced (no lower levels components). The ECM must be replaced if the ECM is damaged. Replace the ECM if a failure is diagnosed.

Pin Locations

Table 1
Implement ECM Connector J1 Contact Descriptions (1) 
No.  Type  Function 
Key Switch Input  Key ON 
10  Cat Data Link (+)  Cat Data Link + 
11  Sensor Power Output  5V Power Supply 
13  Battery Return  Battery - 
20  Cat Data Link (-)  Cat Data Link - 
21  Sensor Power Return  5V Return 
23  Battery Return  Battery - 
39  Batter Power Input  Battery + 
44  Sensor Power Output  8V Power Supply 
45  Sensor Power Return  8V Return 
47  Battery Power Input  Battery + 
56  Sensor Power Return  10V Return 
57  Battery Return  Battery - 
70  Battery Return  Battery - 
(1) Contacts that are not listed are not used.

Table 2
Implement ECM Connector J2 Contact Descriptions (1) 
No.  Type  Function 
Sourcing Drive Output  Back Up Alarm 
Sourcing Drive Return  Driver Return 
67  CAN Data Link (+)  CAN A+ 
68  CAN Data Link (-)  CAN A- 
(1) Contacts that are not listed are not used.

Table 3
Power train ECM Connector J1 Contact Descriptions (1) 
No.  Type  Function 
Key Switch Input  Key ON 
Differential Speed Input (+)  TC Output SP / Transmission Input SP + 
Differential Speed Input (-) or Hall Effect Input  TC Output SP / Transmission Input SP - 
Differential Speed Input (+)  Transmission INTMD SP / Planetary Member SP + 
Differential Speed Input (-) or Hall Effect Input  Transmission INTMD SP / Planetary Member SP - 
Differential Speed Input (+)  Transmission Output Speed Sensor 1+ 
Differential Speed Input (-) or Hall Effect Input  Transmission Output Speed Sensor 1 - 
Differential Speed Input (+)  Transmission Output Speed Sensor 2+ 
Differential Speed Input (-) or Hall Effect Input  Transmission Output Speed Sensor 2 - 
10  Cat Data Link (+) or CAN Data Link (-)  Cat Data Link + 
11  Sensor Power Output  5 V Power Supply 
12  Sourcing Driver Output  Transmission Bypass / LO R HI F Synchro V 
13  Battery Return  Battery - 
16  Differential Speed Input (-) or Hall Effect Input  Front Axle Speed - 
18  Differential Speed Input (-) or Hall Effect Input  Rear Axle Speed - 
20  Cat Data Link (-) or CAN Data Link (+)  Cat Data Link - 
21  Sensor Power Return  5V Return 
22  Analog Input  Transmission Oil Temperature Sensor 
23  Battery Return  Battery - 
27  Switch to Ground Input  Identification Code 2 
29  Analog Input  Torque Converter / Variator Flushing Oil Temperature 
30  Analog Input  Front Axle Oil Temperature Sensor 
31  Battery Power to Input  Battery + 
32  Switch to Ground Input  Identification Code Enable 
33  Switch to Ground Input  Forward Direction Switch 
34  Switch to Ground Input  Neutral Direction Switch 
35  Switch to Ground Input  Reverse Direction Switch 
36  Analog Input  Park Brake Pressure Sensor 
37  Analog Input  Brake Accumulator Oil Pressure Sensor 
39  Battery Power Input  Battery + 
40  Switch to Ground Input  First Speed Shift 
41  Switch to Ground Input  Armrest Position Switch N/C 
42  Switch to Ground Input  Armrest Position Switch N/O 
43  Switch to Ground Input  Second Speed Shift 
44  Sensor Power Output  8V Power Supply 
45  Sensor Power Return  8V Return 
47  Battery Power Input  Battery + 
48  Sourcing Driver Output   Clutch 6 / PPV Pump Control A 
49  Sourcing Driver Output   Main Relief Pressure / PPV Pump Control B 
50  Sourcing Driver Return  Driver Return 
51  Sourcing Driver Output  Lockup Clutch / Low F High R Synchronizer Valve 
52    Clutch one Forward/ Low R High F Synchronizer Valve 
53  Analog Input  Axle Oil Temperature Sensor 
54  Sourcing Driver Output  Driver Return 
55  Sourcing Driver Return  Driver Return 
56  Sensor Power Return  10V Return 
57  Battery Return  Battery - 
58  Sourcing Driver Output  Clutch three Forward / Auxiliary Synchronizer Valve 
59  Sourcing Driver Output  Clutch five / Synchronizer Fork Pressure Supply 
60  Sourcing Driver Return  Driver Return 
61  Sourcing Driver Output  Differential Lock (Rear) 
62  Sourcing Driver Output  Differential Lock (Front) 
63  Switch to Ground Input  Third Speed Shift 
64  Switch to Ground Input  Transmission Oil Filter Bypass Switch 
65  Sourcing Driver Output  Clutch four / A 
66  Sourcing Driver Output  Clutch two (FWD)/B 
69  Sensor Power Output / Sourcing Driver Output  10 V Power Supply 
70  Driver Return  Battery - 
(1) Contacts that are not listed are not used.

Table 4
Power train ECM Connector J2 Contact Descriptions (1) 
No.  Type  Function 
Sourcing Driver Output  Start Relay 
Sourcing Driver Return  Driver Return 
Sinking Driver Output  Axle Oil Cooler Clutch 
23  Switch to Ground Input  Transmission Oil Filter Bypass 2 
36  Switch to Ground Input  D Speed Shift 
38  Switch to Ground Input  Manual Differential Lock N/O 
40  PWM Input  Speed Range Thumbroller 
42  PWM Input  Direction Switch 
43  PWM Input or Analog Input  Direction Switch Redundant 
44  Switch to Ground Input  Transmission Downshift / Throttle Lock Set N/O 
67  CAN Data Link (+)  CAN A + 
68  CAN Data Link (-)  CAN A - 
(1) Contacts that are not listed are not used.

Inputs

The inputs describe the status of the machine systems. Two types of inputs exist. The inputs can be either a switch type or a sensor type. Switches provide an open, a ground, or a + battery signal to the inputs of the controller. Sensors (frequency, PWM, or voltage) provide a changing signal to the sensor inputs of the controller. The inputs to ECMs are listed in Tables 3 and 3.

Temperature Sensors

Transmission Oil Temperature Sensor



Illustration 2g02108634
Transmission Oil Temperature Sensor

The transmission oil temperature sensor is a two-wire passive temperature sensor that is located on the transmission oil pump inlet housing. The sensor is an input to the Power Train ECM. The oil temperature sensor information is used to adjust transmission clutch fill times.

The sensor sends an analog signal to the power train ECM indicating torque converter oil temperature. The resistance range for this sensor is 33,650 ohms at −40° C (−40° F)to 18.6 ohms at 150° C (302° F).

Torque Converter Oil Temperature Sensor



Illustration 3g02108634
Torque Converter Oil Temperature Sensor

The transmission oil temperature sensor is a two-wire passive temperature sensor that is located on the transmission oil cooler inlet fitting. The torque converter oil temperature information is sent by the Power Train ECM to the monitoring system. The torque converter temperature is displayed on the temperature gauge on the front dash panel.

The sensor sends an analog signal to the power train ECM indicating torque converter oil temperature. The resistance range for this sensor is 33,650 ohms at −40° C (−40° F)to 18.6 ohms at 150° C (302° F).

Speed Sensors

Transmission Input Speed (Torque Converter)



Illustration 4g01445489

A passive two-wire magnetic frequency-type sensor converts mechanical motion to an AC voltage. The torque converter speed sensor measures torque converter output speed in the range of 25 to 3000 rpm. The speed sensor information is also used by the Power Train ECM to set and adjust transmission shift points.

Transmission Output Speed (2)



Illustration 5g01445492

A passive two-wire magnetic frequency-type sensor converts mechanical motion to an AC voltage. The torque converter output speed sensor measures torque converter output speed in the range of 25 to 3000 rpm. The speed sensor information is also used by the Power Train ECM to set and adjust transmission shift points. Transmission speed sensors may be used in pairs.

Position Sensors

Torque Converter Pedal Position Sensor



Illustration 6g01445493

The pedal position sensor determines the position of the torque converter pedal. The sensor sends a PWM signal to the ECM. The ECM monitors the signal. Then, the ECM calculates the position of the pedal from the signal. Information about the transmission output speed is broadcast on the Cat data link.

Pressure Switches

Transmission Oil Filter Bypass Switch



Illustration 7g03015918

The bypass switch is a pressure switch that shows whether the filter is plugged and the filter is being bypassed. This switch is normally open. When electrical power is applied to the switch, the switch closes. When the filter becomes plugged, the pressure of the oil opens the switch which allows the oil to bypass the filter.

This switch is one of the inputs that is used in order to drive the "system indicator" in the instrument cluster. This indicator is turned ON when the "Transmission oil filter bypass" switch is in the closed position and the transmission oil temperature is greater than 52° C (126° F) with the engine running.

Lock Out Switch

Keyswitch



Illustration 8g03003739
Key Start Switch

The key start switch is an input of the transmission electronic control module (ECM). The key start switch informs the transmission ECM of an attempt to start the engine. The transmission ECM then initiates the neutral start function.

During normal machine operation, the start terminal of the key start switch is open. When the key start switch is turned to the START position, the start terminal closes to the +battery. The +battery voltage is present at connector contact J2-1 of the transmission ECM. When all starting conditions are satisfied, the transmission ECM sends a +battery signal to the connector contact J2-7. The connector contact J2-7 is for the start relay that engages the starter for engine cranking.

Note: When the key start switch is in the ON position, a +battery signal is sent to connector contact J1-1. With +battery signal to connector contact J1-1 will activate the transmission ECM.

Note: After the key start switch is initially turned to the START position, the switch will not return to the START position from the ON position. The switch must be turned to the OFF position first. Then, the switch can be turned to the START position.

STIC Control



Illustration 9g03591717
(1) Maximum Output (Downshift)
(2) Nominal Output
(3) Minimum Output (Upshift)
(4) Reverse
(5) Neutral
(6) Forward

Upshift

Rotate the thumb wheel switch upward in order to signal the ECM to upshift the transmission one gear.

Downshift

Rotate the thumb wheel switch downward in order to signal the ECM to downshift the transmission one gear.

Table 5
Thumb Wheel Switch Status 
Position   
Thumb Wheel Rotated Upward (3)  Minimal Output (Upshift)  Minimal PWM Output 20%+-3% 
Released Thumb Wheel (2)  Nominal Output  Nominal PWM Output 50%+-3% 
Thumb Wheel Rotated Downward (1)  Maximum Output (Downshift)  Maximum PWM Output 80%+-3% 

Direction

The direction switch has three positions: forward (6), neutral (5) and reverse (4). The operator selects the direction of the transmission through the switch.

Table 6
Switch Status 
Position  Reverse (4)  Neutral (5)  Forward (6) 
Reverse (4)  Closed  Open  Open 
Neutral (5)  Open  Closed  Open 
Forward (6)  Open  Open  Closed 

Table 7
Signal 1 and 2 PWM Output 
Position   
Reverse (4)  9% - 20% Duty Cycle 
Neutral (5)  42% - 58% Duty Cycle 
Forward (6)  80% - 91% Duty Cycle 

Outputs

The ECMs respond to decisions by sending electrical signals to the outputs. The outputs can create an action or the outputs can provide information to the operator or the service technician. The outputs of the ECM are listed in Tables 3 and 3.

Solenoids

Transmission Clutch Solenoids



Illustration 10g01237747

The solenoids engage the speed clutches and direction clutches in the transmission.

Note: Do not apply direct battery voltage to the solenoids. The solenoids are not designed for operating with 24 VDC.

Torque Converter Lockup Clutch Solenoid



Illustration 11g01444286

The solenoid functions as a proportional valve. The solenoid modulates hydraulic pressure to the lockup clutch. The ECM increases the PWM Driver to the solenoid valve and the hydraulic pressure at the lockup clutch is increased. The ECM decreases the PWM Driver to the solenoid valve and the hydraulic pressure at the lockup clutch is at a minimum.

Data Link

Cat Data Link

The Cat Data Link is an input/output of the ECM. The data link uses the connector for the service port in order to communicate with the Caterpillar Electronic Technician. A data link connection is provided for the product link.

Note: The control for the product link provides a global positioning system for the machine.

The data link is bidirectional. The bidirectional link allows the ECM to input information and output information. The data link consists of the following parts: internal ECM circuits, the related harness wiring, the service tool connector and the connector for the product link. The Cat Data Link connects to the ECM at contact J1-10 (wire 893-GN(Green)) and contact J1-20 (wire 892-BR(Brown)).

  • The ECM receives commands from the Cat ET in order to change the operating modes. The Cat ET will read the service codes that are stored in the memory of the ECM. The Cat ET will clear the service codes that are stored in the memory of the ECM.

  • The ECM sends the input and the output information to the Caterpillar ET.

Note: An electronic control module that uses the Cat Data Link will have a module identifier. The MID for the Transmission Electronic Control Module is 081.

CAN Data Link

A data link is required for communication with the service tool (Cat ET) and the electronic control modules. A data link is also required for instrument clusters and other devices that use service tool (Cat ET) communications protocol. The data link is not used in order to broadcast any diagnostic information.

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