988G Wheel Loader Power Train Caterpillar

Pinout Specifications for Power Train Electronic Control

Usage:

988G 2TW

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Illustration 1	g00550716
Electronic Control Module (1) Connector J1. (2) Connector J2.

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Table 1
40-Pin Connector J1
Connector Pin ⁽¹⁾	Function
1	+ 24 Volt ECM (Electronic Control Module) Supply (Key ON)
2	Ground
3	CAT Data Link -
4	Reduced Rimpull Indicator Lamp
5	Ground
6	+ 24 Volt ECM (Electronic Control Module) Supply (Key ON)
7	Solenoid Return
8	Start Relay
9	CAT Data Link +
11	Number 2 Clutch Solenoid (Forward)
12	Autoshift Indicator Lamp
13	Direction Switch (Neutral)
14	Direction Switch (Reverse)
15	Torque Converter Output Speed Return
16	Switch and Sensor Ground
17	Number 1 Clutch Solenoid (Reverse)
18	Ride Control Solenoid
19	Upshift Switch (N.C.)
20	Steering and Transmission Lock Switch 1 (N.O.)
21	Ride Control Switch (N.C.)
22	Ride Control Switch (N.O.)
23	Upshift Switch (N.O.)
24	Steering and Transmission Lock Switch 2 (N.C.)
25	Downshift Switch 1 (N.C.)
26	Downshift Switch 2 (N.O.)
27	Reduced Rimpull Switch 3
28	Reverse Fan Switch
30	Direction Switch (Forward)
32	Torque Converter Lockup Switch
33	Auto/Manual Switch (Auto 4)
34	Reduced/Maximum Rimpull Switch
35	Auto/Manual Switch (Auto 3)
36	Reduced Rimpull Switch 4
37	Parking Brake Pressure Switch 1 (N.C.)
38	Auto/Manual Switch (Auto 2)
39	Parking Brake Pressure Switch 2 (N.O.)
40	Key Start Switch To Battery +

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The connector contacts that are not listed are not used.

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Table 2
40-Pin Connector J2
Connector Pin ⁽¹⁾	Function
1	Number 4 Clutch Solenoid Third Speed
2	Number 6 Clutch Solenoid First Speed
3	Solenoid Return
4	Left Pedal Sensor
5	Auto/Manual Switch (Manual)
6	Reduced Rimpull Switch 1
7	Number 3 Clutch Solenoid Fourth Speed
8	Number 5 Clutch Solenoid Second Speed
9	Sensor Power Supply +10V
10	Reduced Rimpull Switch 2
12	Sensor Power Supply +8V
13	Lockup Clutch Solenoid
14	Transmission Output Speed 1 -
18	Oil Temperature Sensor
19	Impeller Clutch Solenoid
20	Transmission Output Speed 1+
23	Engine Speed -
24	Intermediate Speed 1+
25	Transmission Output Speed 2+
29	Engine Speed +
30	Intermediate Speed 2-
31	Transmission Output Speed 2-
35	Intermediate Speed 1-
36	Intermediate Speed 2+
37	Backup Alarm
38	Torque Converter Output Speed Sensor