SENSOR GP-FUEL LEVEL 1636700 - Caterpillar

System Operation Description:Use this procedure if the Caterpillar Electronic Technician (ET) will not power up. Also, use this procedure if Cat ET will not communicate with the Engine Control Module (ECM).Background InformationThe ECM communicates with Cat ET via the ATA data link. Some electronic dashboards use this data link to exchange information. Some automatic transmissions also exchange information via this data link.Typically, several devices are connected to the ATA data link at one time. These devices may include dash displays, trip recorders and transmission controls. These devices may cause problems with the data link. These devices can disrupt communications with the ECM.When the key switch is in the OFF/RESET position, the ECM may communicate with Cat ET. However, the communications may be disrupted and the communications may require frequent reconnection. In order to avoid this problem, place the key switch in the ON position when Cat ET is being used.Cat ET may display the following error message:
The version of the ECM is not recognized and the integrity of the changed parameters and displayed data is not guaranteed.This message indicates that one of the following conditions exist:
The flash file in the ECM is newer than the version of Cat ET.
The latest version of Cat ET has not been installed.
Illustration 1 g00650338
Schematic for ATA data link with 6-pin connector
Test Step 1. Inspect Electrical Connectors And Wiring
Illustration 2 g01150769
Pin locations on ECM connector
(P1-9) J1587 Data link positive
(P1-8) J1587 Data link negative
Turn the ignition key switch to the OFF/RESET position.
Thoroughly inspect the following electrical connectors:
ECM vehicle harness connector J1/P1
Data link connector
Firewall bulkhead connector
Connectors for Cat ET
ATA data link (terminal 8 and terminal 9) in the connectorsRefer to Troubleshooting, "Electrical Connectors -Inspect" for details.
Perform a 45 N (10 lb) pull test on each of the wires in the ECM connector that are associated with the ATA data link.
Check the ECM connector (allen head screw) for the proper torque. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
Check the harness and wiring for abrasion and for pinch points from the connector to the ECM. Expected Result:All connectors, pins and sockets are completely coupled and/or inserted and the harness and wiring are free of corrosion, of abrasion or of pinch points.Results:
OK - The wiring and the connectors appear to be OK. Proceed to Test Step 2.
Not OK - There is a problem with the wiring or with a connector.Repair: Repair the connectors or wiring and/or replace the connectors or wiring. Ensure that all of the seals are properly in place and ensure that the connectors are completely coupled. Verify that the problem is resolved.STOPTest Step 2. Determine the Type of Problem with the Data Link
Connect Cat ET to the data link connector.
Start the engine. Expected Result: The engine starts. Cat ET powers up and Cat ET communicates without error.Note: Check the display screen or check the communication adapter display in order to determine if Cat ET has powered up. Cat ET will display information that shows if the tool is receiving power. If Cat ET or the