Electrical Connectors and Functions
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| Connector | Component |
|---|---|
| J1/P1 | Electronic Control Module |
| J2/P2 | Electronic Control Module |
| J3A | Machine Interface Connector |
| J3B | Machine Interface Connector |
| J3C | Machine Interface Connector |
| J4/P4 - J19/P19 | Fuel Injector |
| J20/P20 | Engine Speed/Timing Sensor |
| J21/P21 | Coolant Temperature Sensor |
| J22/P22 | Filtered Engine Oil Pressure Sensor |
| J23/P23 | Turbocharger Compressor Outlet Pressure Sensor |
| J25/P25 | Right Turbocharger Compressor Inlet Pressure Sensor |
| J26/P26 | Permanent Timing Calibration Connector |
| J27/P27 | Atmospheric Pressure Sensor |
| J28/P28 | Left Turbocharger Compressor Inlet Pressure Sensor |
| J29/P29 | Crankcase Pressure Sensor |
| J30/P30 | Left Exhaust Temperature Sensor |
| J31/P31 | Right Exhaust Temperature Sensor |
| J32/P32 | Aftercooler Temperature Sensor |
| J35/P35 | Throttle Position Sensor |
| J42/P42 | Service Tool Connector |
| J47/P47 | Coolant Flow Switch |
| J48/P48 | Unfiltered Engine Oil Pressure Sensor |
| J84/P84 | Engine Fan Speed Sensor |
| J85/P85 | Pressure Sensor for the Engine Cooling Fan Pump |
| J86/P86 | Engine Cooling Fan Solenoid |
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| Illustration 1 | g00607248 |
Electronic Control Module | |
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| Illustration 2 | g00870177 |
40-pin connector | |
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| Illustration 3 | g00680846 |
2-pin connector | |
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| Illustration 4 | g00893487 |
40-pin engine connector | |
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| Illustration 5 | g00680848 |
3-pin connector | |
Caterpillar Information System:
621G, 623G, 627G, 631G, 637G, and 657G Wheel Tractor-Scrapers Power Train Electronic Control System MID 027 - CID 1276 - FMI 06
621G, 623G, 627G, 631G, 637G, and 657G Wheel Tractor-Scrapers Power Train Electronic Control System MID 027 - CID 1276 - FMI 05
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621G, 623G, 627G, 631G, 637G, and 657G Wheel Tractor-Scrapers Power Train Electronic Control System MID 027 - CID 1275 - FMI 06
621G, 623G, 627G, 631G, 637G, and 657G Wheel Tractor-Scrapers Power Train Electronic Control System MID 027 - CID 1275 - FMI 05
621G, 623G, 627G, 631G, 637G, and 657G Wheel Tractor-Scrapers Power Train Electronic Control System MID 027 - CID 1276 - FMI 03
621G, 623G, 627G, 631G, 637G, and 657G Wheel Tractor-Scrapers Power Train Electronic Control System MID 027 - CID 1275 - FMI 03
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621G, 623G, 627G, 631G, 637G, and 657G Wheel Tractor-Scrapers Power Train Electronic Control System MID 027 - CID 1281 - FMI 08
621G, 623G, 627G, 631G, 637G, and 657G Wheel Tractor-Scrapers Power Train Electronic Control System MID 027 - CID 1281 - FMI 04
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IT38G Series II Integrated Toolcarrier and 938G Series II Wheel Loader Electrical Connector - Inspect
IT38G Series II Integrated Toolcarrier and 938G Series II Wheel Loader Wiring Harness (Open Circuit) - Test
621G, 623G, 627G, 631G, 637G, and 657G Wheel Tractor-Scrapers Power Train Electronic Control System MID 027 - CID 1275 - FMI 13
621G, 623G, 627G, 631G, 637G, and 657G Wheel Tractor-Scrapers Power Train Electronic Control System MID 027 - CID 1276 - FMI 13
IT38G Series II Integrated Toolcarrier and 938G Series II Wheel Loader Wiring Harness (Short Circuit) - Test
621G, 623G, 627G, 631G, 637G, and 657G Wheel Tractor-Scrapers Power Train Electronic Control System MID 027 - CID 1281 - FMI 13
IT38G Series II Integrated Toolcarrier and 938G Series II Wheel Loader Electronic Control Module (ECM) - Flash Program
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