ENGINE AR 7C6629 - Caterpillar

Illustration 1 g01040760
Schematic of the Autoshift and the Transmission Electronic Control Modules This diagnostic code is associated with the shift lever transmission control.FMI 09 is recorded when the transmission electronic control module senses a problem in the shift lever and the related harness.Test Step 1. CHECK FOR A SHORT TO GROUND.
Turn the key start switch to the OFF position.
Disconnect the shift lever's 12 pin connector. The connector is located on the back of the shift lever's handle.
Measure the continuity from ground to contact 2 of the 12 pin connector.Expected Result:There is continuity.Results:
YES - There is continuity. The ground circuit is normal. Proceed to test step 2.
NO - There is NOT continuity. The ground circuit has failed.Repair: Repair the harness or replace the harness. Stop.Test Step 2. VERIFY THE BATTERY VOLTAGE AT THE SHIFT LEVER.The battery voltage is measured at the battery posts. The voltage at the shift lever must not vary from the battery voltage more than 0.5 VDC.
Connect the shift lever's 12 pin connector. The connector is located on the back of the shift lever's handle.
Turn the key start switch to the RUN position.The engine should not be running.
Use a 7X-1710 Multimeter Probe Group in order to measure the voltage at the connector for the shift lever. Measure the voltage between contact 1 and contact 2.Expected Result:The voltage at the shift lever does NOT vary from the battery voltage more than 0.5 VDC.Results:
YES - The voltage at the shift lever does not vary from the battery voltage more than 0.5 VDC. The system voltage is correct. Proceed to test step 3.
NO - The voltage at the shift lever varies from the battery voltage more than 0.5 VDC. The system voltage is not correct. There is a problem in the wiring.Repair: Repair the harness or replace the harness. Stop.Test Step 3. CONDUCT TESTS OF THE SHIFT LEVER'S CIRCUITS.
Check the fuse for the shift lever transmission control.The fuse is located in the machine's fuse panel.
Check the fuse for an open.Expected Result:The fuse is open.Results:
YES - The fuse is open. Proceed to test step 4.
NO - The fuse is not open. Proceed to test step 5.Test Step 4. CHECK THE HARNESS.
Turn the key start switch to the OFF position.
Disconnect the machine harness from the shift lever transmission control.
Take resistance measurements at the control module's connector. Measure the resistance between contact 1 and contact 2.Expected Result:The resistance is greater than 10,000 ohms.Results:
YES - The resistance is greater than 10,000 ohms. There is no problem. Repeat to test step 4.
NO - The resistance is less than 10,000 ohms. There is a short in the shift lever transmission control.Repair: It is unlikely that the shift lever transmission control has failed. Exit this procedure and perform this procedure again. Also, recheck if the diagnostic code is active. If the cause of the diagnostic code is not found, replace the shift lever transmission control. Replace the fuse. See Testing and Adjusting, "Transmission Control (Shift Lever) - Replace". Stop.Test Step 5. MEASURE THE CONTINUITY OF THE CAT