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Answered in 8 hours by:
6/26/2013
catmastertech, Technician
Category: Construction and Road Equipment
Satisfied Customers: 4,095
Experience: Field service technician for CAT 19 years.
VerifiedVerify your door switch is not causing a problem. If the door switch or the bypass harness for when the door is off, is not working, hydraulics are disabled.
Please follow these tests to find the problem with you controls.
Please follow these tests to find the problem with you controls.
Armrest Indicator Is Flashing
Test Step 1. CHECK FOR A FLASHING ARMREST INDICATOR BEFORE THE SYSTEM IS ENABLED
- Occupy the seat.
- Place the armrest in the DOWN position.
- Turn the key start switch to the ON position.
Expected Result:
The armrest indicator should be off.
Results:
- OK - The armrest indicator is off. Proceed to Test Step 11.
- NOT OK - The armrest indicator is flashing. Proceed to Test Step 2.
- NOT OK - The armrest indicator is on.
Repair: The armrest switch is not being actuated. Adjust the switch or replace the switch.
Stop.
Test Step 2. CHECK THE ARMREST SWITCH FOR PROPER OPERATION WITH THE ARMREST IN THE DOWN POSITION
- Turn the key start switch to the OFF position.
- Locate the connector for the armrest switch.
- Disconnect the connector for the armrest switch.
- Place the armrest in the DOWN position.
- Measure the resistance of the armrest switch from contact 1 to contact 2.
- Measure the resistance of the armrest switch from contact 1 to contact 3.
Expected Result:
The resistance should be greater than 5000 Ohms from contacts 1 to 2. The resistance should be less than 5 Ohms from contacts 1 to 3.
Results:
- OK - The resistance is greater than 5000 Ohms from contacts 1 to 2 and the resistance is less than 5 Ohms from contacts 1 to 3. Proceed to Test Step 3.
- NOT OK - The resistance is less than 5000 Ohms from contacts 1 to 2 or the resistance is not less than 5 Ohms from contacts 1 to 3.
Repair: The armrest switch has failed. Replace the armrest switch.
Stop.
Test Step 3. CHECK THE ARMREST SWITCH FOR PROPER OPERATION WITH THE ARMREST IN THE UP POSITION
- Place the armrest in the UP position.
- Measure the resistance of the armrest switch from contact 1 to contacts 2.
- Measure the resistance of the armrest switch from contact 1 to contacts 3.
Expected Result:
The resistance should be greater than 5000 Ohms from contacts 1 to 3. The resistance should be less than 5 Ohms from contacts 1 to 2.
Results:
- OK - The resistance is greater than 5000 Ohms from contacts 1 to 3 and the resistance is less than 5 Ohms from contacts 1 to 2. Proceed to Test Step 4.
- NOT OK - The resistance is less than 5000 Ohms from contacts 1 to 3 or the resistance is not less than 5 Ohms from contacts 1 to 2.
Repair: The armrest switch has failed. Replace the armrest switch.
Stop.
Test Step 4. CHECK WIRE 201 AT THE CONNECTOR FOR THE ARMREST FOR AN OPEN
- Use the connector that had been connected to the armrest switch. Measure the resistance from contact 1 (wire 201-BK) to the machine frame.
Expected Result:
The resistance should be less than 5 Ohms.
Results:
- OK - The resistance is less than 5 Ohms. Proceed to Test Step 5.
- NOT OK - The resistance is not less than 5 Ohms.
Repair: The wire harness has failed. Repair the wire harness and/or the connector or replace the wire harness and/or the connector.
Stop.
Test Step 5. CHECK WIRE 984 AT THE CONNECTOR FOR THE ARMREST FOR A SHORT TO GROUND
- Use the connector that had been connected to the armrest switch. Measure the resistance from contact 2 (wire 984-PK) to the machine frame or to contact 1.
Expected Result:
The resistance should be greater than 3000 Ohms.
Results:
- OK - The resistance is greater than 3000 Ohms. Proceed to Test Step 6.
- NOT OK - The resistance is not greater than 3000 Ohms.
Repair: The wire harness has failed. Repair the wire harness and/or the connector or replace the wire harness and/or the connector.
Stop.
Test Step 6. CHECK WIRE 983 AT THE CONNECTOR FOR THE ARMREST FOR A SHORT TO GROUND
- Use the connector that had been connected to the armrest switch. Measure the resistance from contact 3 (wire 983-GN) to the machine frame or to contact 1.
Expected Result:
The resistance should be greater than 5000 Ohms.
Results:
- OK - The resistance is greater than 5000 Ohms. Proceed to Test Step 7.
- NOT OK - The resistance is not greater than 5000 Ohms.
Repair: The wire harness has failed. Repair the wire harness and/or the connector or replace the wire harness and/or the connector.
Stop.
Test Step 7. CHECK THE SEAT SWITCH.
- Reconnect the armrest switch.
- Raise the cab. See Operation and Maintenance Manual, "Cab Tilting".
- Locate the connector for the seat switch.
- Disconnect the connector for the seat switch.
- Jumper contact 1 to contact 2 (wire G983-GN to wire G985-PU) together.
- Lower the cab.
- Place the armrest in the DOWN position.
- Turn the key start switch to the ON position.
Expected Result:
The armrest indicator should be off.
Results:
- OK - The armrest indicator is off.
Repair: The seat switch has failed. Replace the switch. DO NOT OPERATE THE MACHINE WITH THE JUMPER IN PLACE.
Stop.
- NOT OK - The armrest indicator is flashing. Proceed to Test Step 8.
Test Step 8. CHECK WIRE 983 FOR AN OPEN
- Raise the cab.
- Remove the jumper.
- Disconnect the armrest switch.
- Measure the resistance from contact 3 of the connector for the armrest switch to contact 1 of the connector for the seat switch. The wire number that is being checked is 983-GN.
Expected Result:
The resistance should be less than 5 Ohms.
Results:
- OK - The resistance is less than 5 Ohms. Proceed to Test Step 9.
- NOT OK - The resistance is not less than 5 Ohms.
Repair: The wire harness has failed. Repair the wire harness and/or the connector or replace the wire harness and/or the connector.
Stop.
Test Step 9. CHECK WIRE 985 FOR A SHORT TO GROUND
- Locate the interlock ECM. The interlock ECM is located on the back side of the cab. The cab must be in the RAISED position in order to get to the ECM.
- Disconnect the wire harness from the interlock ECM.
- Measure the resistance from contact 3 to contact 58 (wire 201-BK to wire G985-PU) of the wire harness connector.
Expected Result:
The resistance should be greater than 3000 Ohms.
Results:
- OK - The resistance is greater than 3000 Ohms. Proceed to Test Step 10.
- NOT OK - The resistance is not greater than 3000 Ohms.
Repair: The wire harness has failed. Repair the wire harness and/or the connector or replace the wire harness and/or the connector.
Stop.
Test Step 10. CHECK WIRE 985 FOR AN OPEN
- Measure the resistance from contact 58 of the connector for the ECM to contact 2 of the connector for the seat switch. The wire number that is being checked is 985-PU.
Expected Result:
The resistance should be less than 5 Ohms.
Results:
- OK - The resistance is less than 5 Ohms.
Repair: The ECM is very unlikely to have failed. Reconnect all connections and visually inspect the wire harness. Verify that the diagnostic code still exists. If the diagnostic code still exists perform the Test Steps again.Replace the ECM, if the cause of the diagnostic code was not found after the second attempt. See Testing and Adjusting, "Electronic Control Module (ECM) - Replace".
Stop.
- NOT OK - The resistance is not less than 5 Ohms.
Repair: The wire harness has failed. Repair the wire harness and/or the connector or replace the wire harness and/or the connector.
Stop.
Test Step 11. CHECK FOR A FLASHING ARMREST INDICATOR AFTER THE SYSTEM IS ENABLED.
Note: The seat will still need to be occupied and the armrest will need to be down. The key start switch will also need to be in the ON position.
- Press and release the parking brake switch.
Expected Result:
The armrest indicator should be off.
Results:
- OK - The armrest indicator is off.
Repair: There is no problem at this time.
Stop.
- NOT OK - The armrest indicator is flashing. Proceed to Test Step12.
Test Step 12. CHECK THE CIRCUIT OF THE WORK TOOL PILOT SOLENOID FOR A SHORT TO GROUND
- Turn the key start switch to the OFF position.
- Raise the cab. See Operation and Maintenance Manual, "Cab Tilting".
- Locate the Interlock ECM. The interlock ECM is located on the back side of the cab. The cab must be in the RAISED position in order to get to the ECM.
- Remove the wire harness from the ECM.
- Measure the resistance from contact 3 to contact 24 (wire 201-BK to wire G988-OR) of the wire harness connector.
Expected Result:
The resistance should be greater than 5000 Ohms.
Results:
- OK - The resistance is greater than 5000 Ohms. Proceed to Test Step 15.
- NOT OK - The resistance is not greater than 5000 Ohms. Proceed to XXXXX 13.
Test Step 13. CHECK THE WORK TOOL PILOT SOLENOID FOR A SHORT TO GROUND
- Locate the work tool pilot solenoid.
- Disconnect the wire harness from the work tool pilot solenoid.
- Measure the resistance between both of the solenoid wires to the machine frame.
Expected Result:
The resistance should be greater than 5000 Ohms.
Results:
- OK - The resistance is greater than 5000 Ohms. Proceed to Test Step 14.
- NOT OK - The resistance is not greater than 5000 Ohms.
Repair: The work tool pilot solenoid has failed. Replace the coil of the work tool pilot solenoid.
Stop.
Test Step 14. CHECK THE WORK TOOL DETENT COIL FOR A SHORT TO GROUND
- Locate the work tool detent coil.
- Disconnect the work tool detent coil from the wire harness.
- Measure the resistance between both of the coil wires to the machine frame.
Expected Result:
The resistance should be greater than 5000 Ohms.
Results:
- OK - The resistance is greater than 5000 Ohms.
Repair: The wire harness has shorted to ground. Repair the wire harness or replace the wire harness.
Stop.
- NOT OK - The resistance is not greater than 5000 Ohms.
Repair: The work tool detent coil has failed. Replace the the work tool detent coil.
Stop.
Test Step 15. CHECK THE CIRCUIT OF THE WORK TOOL PILOT SOLENOID FOR AN OPEN CIRCUIT
- Measure the resistance from contact 24 to contact 68 (wire G988-OR to wire 975-WH) of the wire harness connector.
Expected Result:
The resistance should be approximately 6 Ohms.
Results:
- OK - The resistance is approximately 6 Ohms.
Repair: The ECM is very unlikely to have failed. Reconnect all connections and visually inspect the wire harness. Verify that the diagnostic code still exists. If the diagnostic code still exists perform the Test Steps again.Replace the ECM, if the cause of the diagnostic code was not found after the second attempt. See Testing and Adjusting, "Electronic Control Module (ECM) - Replace".
Stop.
- NOT OK - The resistance is considerably greater than 6 Ohms.
Repair: Wire 975-WH of the wire harness has an open. Repair the wire harness and/or the connector or replace the wire harness and/or the connector.
Stop.
- NOT OK - The resistance is less than 3 Ohms. Proceed to Test Step 16.
Test Step 16. CHECK THE WORK TOOL PILOT SOLENOID FOR A SHORTED WINDING
- Locate the work tool pilot solenoid.
- Disconnect the work tool pilot solenoid from the wire harness.
- Measure the resistance between the two solenoid wires.
Expected Result:
The resistance should be approximately 10.5 Ohms.
Results:
- OK - The resistance is approximately 10.5 Ohms. Proceed to Test Step 17.
- NOT OK - The resistance is not approximately 10.5 Ohms.
Repair: The work tool pilot solenoid has failed. Replace the coil of the work tool pilot solenoid.
Stop.
Test Step 17. CHECK THE WORK TOOL DETENT COIL FOR A SHORTED WINDING
- Locate the work tool detent coil. The detent coil is located beneath the right hand joystick. Remove the access panel in order to get to the connector.
- Disconnect the work tool detent coil from the wire harness.
- Measure the resistance between the two wires of the coil.
Expected Result:
The resistance should be approximately 12 Ohms.
Results:
- OK - The resistance is approximately 12 Ohms.
Repair: The wire harness is shorted. Repair the wire harness or replace the wire harness.
Stop.
- NOT OK - The resistance is not approximately 12 Ohms.
Repair: The work tool detent coil has failed. Replace the the work tool detent coil.
Stop.
Your welcome, This info is for a later 5FZ serial number. If you find things are not matching the descriptions shown in the testing, I may need to find a different guide. that is why I need the serial number. Three possible harness's for the 226.
If you have a problem with a step, feel free to ask me questions about it. I will be glad to help.
If you have a problem with a step, feel free to ask me questions about it. I will be glad to help.
catmastertech, Technician
Category: Construction and Road Equipment
Satisfied Customers: 4,095
Experience: Field service technician for CAT 19 years.
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