SEAL-LIP TYPE 0930854 - Caterpillar

Illustration 2 g01254278
(1) Left steering cylinder (2) Right steering cylinder (3) Connector for steering position sensor on the back side of the cylindersThis diagnostic code is associated with the left steering cylinder position sensor. The position sensor provides a PWM input signal to the Implement ECM and to the Transmission/Chassis ECM. The FMI 04 diagnostic code is activated when the ECM reads the input signal from the sensor and the voltage of the signal is below normal.The sensor is a PWM sensor that operates at a frequency of approximately 500 hertz. The duty cycle of the PWM signal that is supplied to the ECM is measured in very small increments. The changes in the duty cycle of the sensor cannot be measured with a digital multimeter.The following conditions could cause this diagnostic code to be activated:
The signal circuit is shorted to a ground source.
The sensor has failed.
The ECM has failed. This is unlikely. Note: Before performing this procedure, check for an active CID 1482 diagnostic code for the 10 volt sensor power supply of the Transmission/Chassis ECM (MID 027). Correct any problem with the 10 volt power supply before performing this procedure.Note: The Transmission/Chassis ECM (MID 027) and the Implement ECM (MID 082) receive an input signal from the position sensor of the left steer cylinder. Both the electronic control modules can activate a CID 2200 FMI 04 diagnostic code when the signal is below normal.
If one ECM has activated a CID 2200 FMI 04 diagnostic code and the other ECM has not activated the diagnostic code, it is likely that the sensor is operating correctly. When this occurs, a poor connection in the machine harness would be suspected.
When both of the electronic control modules have activated the diagnostic code, either the sensor or a harness problem could be the cause.
If both the electronic control modules have activated the diagnostic code, it is very unlikely that either ECM is causing the problem.
For either condition, proceed with this procedure in order to verify the cause of the problem.Before performing this procedure, inspect the harness connectors that are involved in the circuit. Poor connections are often the cause of a problem in an electrical circuit. Inspect the connections for the following:
Connections are clean.
Connections are secure.
Connections are in good condition.If a problem with a connection is found, correct the problem and verify that this diagnostic code is active before performing this procedure.Note: The following test procedure may create other diagnostic codes. Clear the diagnostic codes when the original diagnostic code has been corrected.Test Step 1. CHECK THE SENSOR
Turn the disconnect switch to the OFF position.
Turn the key start switch to the OFF position.
Mark the harness connector for the left steering sensor.
Disconnect the machine harness connector from the position sensor of the left steering cylinder.
Disconnect the machine harness connector from the position sensor of the right steering cylinder.
Connect the marked connector for the left steering sensor to