VALVE AR-SWING 3678670 - Caterpillar

Illustration 1 g00840992
Schematic for the Position Sensor (Lift Linkage)
This diagnostic code is recorded when the ECM records an erratic signal or an intermittent signal from the position sensor for the Lift Linkage. There could also be a short to the +battery, a short to ground, or an open circuit. The position sensor for the lift linkage is a PWM sensor. The signal wire for the position sensor connects to contact J2-35 (wire C530-BU(Blue)) of the ECM. The possible causes of this diagnostic code are listed:
The signal circuit is open.
The +battery circuit from the electrical system to the sensor is open.
The signal circuit is shorted to the +battery.
The signal circuit is shorted to ground.
The sensor is not adjusted properly.System Response:The kickouts will not function properly. The implements will function slowly. The snubbing of the lift cylinder will not function. The calibration procedure for the implement valves may not function properly. The feather catch feature for the lift linkage will not function properly.Note: The feather catch feature allows the lift linkage to slow down gradually when the control lever is moved abruptly from the lower position to the center position.Note: Ensure that CID 350 FMI 02 is active and that the diagnostic code indicator is active.Test Step 1. CHECK THE ECM AND THE HARNESS.
Turn the disconnect switch and the key start switch to the ON position.
Disconnect the harness from the position sensor.
At the harness connector for the sensor, measure the voltage between contact A (wire 146-GY(Grey)) and contact B (wire 299-BK(Black)). Note: Disconnecting the position sensor for more than five seconds resets the calibration for the position sensor. The position sensor must be recalibrated when testing is completed.Expected Result:The voltage measures approximately 24 DCV.Results:
OK - The voltage is approximately 24 DCV. Proceed to test step 2.
NOT OK - The voltage does NOT measure 24 DCV. The harness has failed or the fuse has failed. Proceed to Step 5.Test Step 2. CHECK THE ECM AND THE HARNESS.
The harness remains disconnected from the sensor.
At the harness connector for the sensor, measure the voltage between signal contact C (wire C530-BU(Blue)) and ground contact B (wire 299-BK(Black)). Expected Result:The voltage measures 5.0 0.5 DCV.Results:
OK - The voltage measures 5.0 0.5 DCV.Repair: The harness is correct. Replace the sensor.STOP
NOT OK - The voltage is above 5.0 0.5 DCV. The ECM has failed or the harness has failed. Proceed to test step 3.
NOT OK - The voltage is below 5.0 0.5 DCV. The ECM has failed or the harness has failed. Proceed to test step 4.Test Step 3. CHECK FOR A SHORT IN THE HARNESS.
The sensor remains disconnected.
Turn the disconnect switch and the key start switch to the OFF position.
Disconnect the harness connectors (J1, J2) from the ECM.
At the harness connector for the ECM, measure the resistance between contact J2-35 (wire C530-BU(Blue)) to all other J1 and J2 connector contacts. Expected Result:The resistance is greater than 5000 Ohms.Results:
OK - The resistance is greater than 5000 Ohms.Repair: The harness resistance is correct. It is