Wiring Harness (Open Circuit) - Test
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621K OEM Wheel Tractor-Scraper
[UENR5941]
621K OEM Wheel Tractor-Scraper
Switch Circuits - Test
621K OEM Wheel Tractor-Scraper
Wiring Harness (Short Circuit) - Test
ELECTRICAL AND STARTING SYSTEM
WIRING GP
621K, 623K and 627K Wheel Tractor-Scrapers
Connector Locations
MH3022, MH3024 and MH3026 Material Handlers
Electrical Connector - Inspect
621K OEM Wheel Tractor-Scraper
System Schematic
621K OEM Wheel Tractor-Scraper
CAN Data Link - Test
621K OEM Wheel Tractor-Scraper
Cat Data Link - Test
621K OEM Wheel Tractor-Scraper
ECM Location Code - Test
621K OEM Wheel Tractor-Scraper
Wiring Harness (Open Circuit) - Test
1.1. Transmission/Chassis ECM and Implement ECM
2.1. Test For An Open Circuit
Transmission/Chassis ECM and Implement ECM
An open circuit is a failure of an electrical circuit that results in no flow of electrical current. An open circuit can be caused by a broken wire within the circuit. Most often, an open circuit is caused by a poor connection. An open circuit can also be caused by a failed connection in one of the electrical connectors that is used in a circuit.
The following procedure is a way to check for an open or a poor connection in a circuit.
Show/hide table
| Troubleshooting Test Steps | Values | Results |
|---|---|---|
| 1. Identify Open Circuit A. Identify the connectors and the wire numbers of the suspect circuits. Use the Electrical System Schematic of the machine to identify the circuits. B. Turn the key start switch and the disconnect switch OFF. C. Disconnect the component and the ECM from the wiring harness. D. At one of the disconnected harness connections, place a jumper wire from the contact of the suspect wire to frame ground. E. At the other connector of the machine harness, use the multimeter probes to measure the resistance. Measure the resistance from the contact of the suspect wire to frame ground. |
The resistance is less than 5 Ω. |
OK - The harness circuit is correct. STOP NOT OK - The resistance is greater than 5K Ω. There is an open in the machine harness. Repair: Repair or replace the machine harness. Note: A resistance that is greater than 5 Ω but less than 5K Ω would indicate a loose connection or a corroded connection in the circuit. A resistance measurement that is greater than 5K Ω would indicate an open in the circuit. STOP |
Information System:
621K OEM Wheel Tractor-Scraper
Switch Circuits - Test
621K OEM Wheel Tractor-Scraper
Solenoid Valve - Test
621K OEM Wheel Tractor-Scraper
Sensor Supply - Test
621K OEM Wheel Tractor-Scraper
Sensor Signal (PWM) - Test
621K OEM Wheel Tractor-Scraper
Sensor Signal (Analog, Passive) - Test
621K OEM Wheel Tractor-Scraper
Sensor Signal (Analog, Active) - Test
621K OEM Wheel Tractor-Scraper
Relay - Test
621K OEM Wheel Tractor-Scraper
Operator Control Switch (Switch to Ground) - Test
621K OEM Wheel Tractor-Scraper
Indicator Lamp - Test
621K OEM Wheel Tractor-Scraper
Electrical Power Supply - Test
621K OEM Wheel Tractor-Scraper
ECM Location Code - Test
C3.4B Engines
DEF Tank Temperature Is High
621K OEM Wheel Tractor-Scraper
Wiring Harness (Short Circuit) - Test
621K OEM Wheel Tractor-Scraper
Connector Contact Description
631K and 637K Wheel Tractor-Scraper Systems
Brake Accumulator Charging Valve - Test
C3.4B Engines
DEF Tank Temperature Is Low
631K and 637K Wheel Tractor-Scraper Systems
Parking Brake - Test and Adjust
D8T Track-Type Tractor Power Train
Track Roller Frame - Remove and Install
966M and 972M Wheel Loaders
DEF Manifold Filters - Replace
631K and 637K Wheel Tractor-Scraper Systems
Service Brake System Pressure - Test
2014/11/25
Improved Bolted Joint for Rear Engine Mounts is Now Used On Certain Wheel Tractor Scrapers {1152, 1154}
950M and 962M Wheel Loaders Power Train, Steering, Braking, Hydraulic, and Machine Systems
Transmission Pressures - Test and Adjust
950 GC Wheel Loader Power Train
Tire and Rim (Front) - Remove and Install
D3K2, D4K2 and D5K2 Track-Type Tractor Systems
Winch Operation