OPERATOR AR 1991213 - Caterpillar

Illustration 1 g00627903
Schematic of the blade control handleThis diagnostic code is recorded when the implement ECM reads the signal (wire H710-PK) of the blade control handle as being shorted to +battery. The signal is a PWM signal. The signal wire (wire H710-PK) connects to contact J1-16 of the implement ECM.System Response:The machine response is a loss of all blade functions, raise functions and lower functions.
The harness is open.
The harness is shorted high.
The blade control handle is failed.
The ECM has failed. This is unlikely.Note: Ensure that the CID 0352 FMI 03 is active.Note: The following procedure can create numerous related diagnostic codes. When all harnesses are reconnected, the related diagnostic codes will be shown as being not active. Clear all related diagnostic codes after this procedure is completed.Test Step 1. CHECK THE SIGNAL CIRCUIT.
Disconnect the machine harness from the blade control handle.
Turn the disconnect switch and the key start switch to the ON position.
At the machine harness connector for the blade control handle, measure the voltage (DCV) between signal contact D (wire H710-PK) and ground contact B (wire 210-BK).Expected Result:The voltage should measure approximately 5 DCV.Results:
YES - The voltage measures approximately 5 DCV. The ECM and the machine harness are correct.Repair: The blade control handle has failed. Replace the blade control handle. Perform the calibration for the blade control handle. See Testing and Adjusting, "Calibration".STOP
NO - The voltage is NOT approximately 5 DCV. The harness or the ECM has failed. Proceed to test step 2.Test Step 2. CHECK THE GROUND CIRCUIT.
The blade control handle remains disconnected.
Turn the disconnect switch and the key start switch to the OFF position.
Disconnect the J1 and J2 machine harness connectors from the ECM.
At the machine harness connector for the blade control handle, measure the resistance between the ground contact B (wire 210-BK) and frame ground.Expected Result:The resistance is less than 5.0 ohms.Results:
YES - The resistance is less than 5.0 ohms. The resistance of the harness is correct. Proceed to test step 3.
NO - The resistance is greater than 5.0 ohms. The ground circuit in the harness has failed.Repair: There is an open in the harness. The open is between the ground contact B (wire 210-BK) and frame ground. Repair the machine harness or replace the machine harness.STOPTest Step 3. CHECK FOR A SHORTED HARNESS.
The blade control handle and the ECM remain disconnected from the machine harness connector.
The disconnect switch remains in the OFF position.
At the machine harness connector for the ECM, measure the resistance between the signal contact J1-16 (wire 710-PK) and all other J1 and J2 contacts. Expected Result:The resistance that is measured is greater than 5000 ohms for each measurement.Results:
YES - The resistance that is measured is greater than 5000 ohms for each measurement. The resistance of the harness is correct. Proceed to 4.
NO - The resistance is less than 5000 ohms. The machine harness has failed.Repair: There is a short between the signal contact J1-16 and the circuit with the low resistance measurement. Repair the harness or replace the harness.STOPTest Step 4.