GASKET 9L8786 - Caterpillar

System Operation Description:Every generated code is stored in the memory of the module that detected the problem. The codes remain in the memory of the module even if power is removed from the module.The diagnostic reset switch allows the operator to clear the diagnostic codes. Diagnostic codes cannot be individually cleared. Toggling the switch clears all of the diagnostic codes in all of the modules.Note: Do not clear the diagnostic codes until all of the codes have been addressed.If the engine is not equipped with the optional air/fuel ratio control, the EIS control module clears the codes. The codes are cleared when terminal "h" of the EIS connector is connected to ground.If the engine is equipped with the optional air/fuel ratio control, the Electronic Control Module (ECM) clears the codes. The codes in the ECM are cleared when terminal P1-37 is connected to ground. The ECM sends a command to the EIS control module via the Cat Data Link. This causes the codes in the EIS control module to be cleared.If the input for clearing the codes is connected to ground for more than ten seconds, a 321-04 diagnostic code will be activated.
Illustration 1 g01044807
Schematic diagram of the diagnostic reset switchThe engine is not equipped with a remote control panel.
Illustration 2 g01044814
Schematic diagram of the diagnostic reset switchThe engine is equipped with a remote control panel that only includes a status control module.
Illustration 3 g01044815
Schematic diagram of the diagnostic reset switchThe engine is equipped with a remote control panel that includes a status control module and air/fuel ratio control.
Illustration 4 g01044816
Schematic diagram of the diagnostic reset switchThe engine is configured forCanadian Standards Association (CSA). The left schematic is for engines that are not equipped with the optional air/fuel ratio control.Test Step 1. Inspect the Electrical Components and the Wiring
Set the engine control to the OFF/RESET mode. Remove the electrical power from the engine.Note: For the following steps, refer to Troubleshooting, "Inspecting Electrical Connectors".
Thoroughly inspect each of the following components:
EIS connectors
J1/P1 connectors for the ECM
The appropriate terminals on the terminal strips
The electrical connections for the diagnostic reset switch
The electrical connections for the idle/rated switch
The electrical connections for the oxygen calibration's switch
Illustration 5 g01044800
Harness side of the EIS connector (EISC-B) −Battery (EISC-h) Diagnostic reset
Illustration 6 g01044801
Harness side of the P1 connector (P1-3) Sensor ground (P1-37) Diagnostic reset
Perform a 45 N (10 lb) pull test on each of the wires that are associated with the circuit for the diagnostic reset.
Check the wiring for corrosion, for abrasion, and for pinch points.Expected Result:The components and the wiring are connected properly. The connectors and the wiring do not have corrosion, abrasion, or pinch points.Results:
OK - The components are in good condition with proper connections. If you are troubleshooting a 321-04 diagnostic code, proceed to Test Step 2. If toggling the switch does not clear the codes, proceed to Test Step 5.
Not OK - The components are not in good condition and/or at least one connection is improper.Repair: Perform the necessary repairs and/or replace parts, if necessary.STOPTest Step 2. Determine the