PINION-DIFFERENTIAL 1303587 - Caterpillar

Illustration 1 g01408088This diagnostic code is recorded when the ECM records an erratic signal or an intermittent signal from the "LH Offset Switch".The possible causes for this diagnostic code are listed below:
The switch has failed.
The signal circuit is open.
A signal circuit is shorted to the +battery circuit.
The signal circuit is shorted to ground.
The signal circuits may be shorted together.
The ECM has failed.Note: Ensure that CID 2261 FMI 02 diagnostic code is active and that the diagnostic code indicator is active.Test Step 1. CHECK THE OPERATION OF THE SWITCH.
Turn the key start switch and the disconnect switch to the OFF position.
Disconnect the machine harness connector from the Switch.
Table 1
Contacts State of Switch
Increment Neutral Decrement
Contacts 1 to 2 Less than 5Ω Greater than 5kΩ Greater than 5kΩ
Contacts 2 to 4 Greater than 5kΩ Less than 5Ω Greater than 5kΩ
Contacts 2 to 6 Greater than 5kΩ Greater than 5kΩ Less than 5Ω
Measure the resistance between the contact points. Refer to the list of contact points in the table above. Note the resistance values. Expected Result:The measurements agree with the values that are listed in Table 1.Results:
YES. - The resistances that were measured agree with the expected measurements that are listed in the table. Proceed to Test Step 2.
NO. - The resistance measurements do not reflect the expected measurements that are listed in the table. The switch has failed.Repair: Replace the switch.STOPTest Step 2. CHECK FOR A SHORTED HARNESS.
The "LH Offset Switch" remains disconnected.
Turn the disconnect switch and the key start switch to the OFF position.
Disconnect the harness connector (J2) from the ECM.
At the harness connector for the ECM (J2), measure the resistance between contact J2-58 (wire Y933-YL(Yellow)) and ALL other J2 connector contacts.
At the harness connector for the ECM (J2), measure the resistance between contact J2-55 (wire Y934-WH(White)) and ALL other J2 connector contacts.
At the harness connector for the ECM (J2), measure the resistance between contact J2-54 (wire Y938-PK(Pink)) and ALL other J2 connector contacts.
At the harness connector for the ECM (J2), measure the resistance between contact J2-22 (wire H745-BR(Brown)) and ALL other J2 connector contacts. Expected Result:The resistance is greater than 5kΩ.Results:
YES. - The resistance is greater than 5kΩ. The harness resistance is correct. Proceed to Test Step 3.
NO. - Resistance is less than 5kΩ. Repair: The harness has failed. Repair the harness or replace the harness.STOPTest Step 3. CHECK FOR AN OPEN HARNESS.
The "LH Offset Switch" remains disconnected from the harness.
The key start switch and the disconnect switch are in the OFF position.
At the harness connector for the "LH Offset Switch", place a jumper wire between the following contacts:
Contact 1 (wire Y934-WH(White)) and Contact 2 (wire H745-BR(Brown))
Contact 4 (wire Y936-PK(Pink)) and contact 6 (wire Y933-YL(Yellow))
The J2 connectors remain disconnected from the ECM.
At the harness connector for the ECM, measure the resistance between contact J2-58 (wire Y933-YL(Yellow)) and contact J2-22 (wire H745-BR(Brown)). Make