SEAL-O-RING 1038254 - Caterpillar

System Operation Description:Use this procedure under the following situation:Use the following information in order to determine if the PTO switch on lamp is operating incorrectly.Terminal 30 (Output 1)With software that is older than OCT99, J1-30 (output 1) is dedicated for use as an output for the PTO switch on lamp. If the "PTO Configuration" is programmed to "Cab Switches", "Remote Switches", or "Remote Throttle", the output will turn the lamp ON whenever the PTO switch is turned ON.With OCT99 and newer software, J1-30 (output 1) can be used as an output for the PTO switch on lamp or as an output for the engine coolant level indicator lamp. The parameters should be programmed to match the desired usage of the terminal. If the "Engine Monitoring Lamps" parameter is programmed to warning lamp, then output 1 is used for the PTO switch on lamp. If the "Engine Monitoring Lamps" parameter is programmed to Option 1and the "Coolant Level Lamp" parameter is programmed to "4-Pin" or "2 wire Float Sensor", then output 1 is used for the low coolant level warning.Note: The "PTO Configuration" must be programmed to "Cab Switches", "Remote Switches", or "Remote Throttle" to utilize the PTO switch on lamp. Option 1 is not available for the GM truck manufacturer.Electrical Connection of LampsOne terminal of the lamp must be connected to battery voltage through the vehicle wiring. The other terminal is connected to the Engine Control Module (ECM) at terminal J1/P1-30.The ECM provides a path to ground in order to turn on the lamp.
Illustration 1 g00703413
Typical circuit schematic for PTO switch on lamp
If terminal P1-30 is used for another function, a lamp may be wired to a multiple pole PTO on/off switch.
Illustration 2 g00834964
Optional circuit for PTO switch on lamp
The return wire may be connected to P1-3, P1-5, or P1-18.
Illustration 3 g01152445
Terminal locations for ECM
(30) Output #1 (PTO switch ON lamp) Test Step 1. Inspect the Electrical Connectors and the Wiring
Thoroughly inspect ECM connector J1/P1, the firewall bulkhead connector, or the PTO switch on lamp. Refer 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 PTO switch on lamp. Refer to Illustration 3.
Check the allen head screw on each ECM connector for the proper torque. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
Check the harness and wiring for abrasion and pinch points from the battery 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 - Proceed to Test Step 2.
Not OK - 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.STOPTest Step 2. Check for Normal Operation of the PTO Switch On Lamp
Use the following procedure for the output 1 (PTO switch on lamp). Connect Caterpillar Electronic Technician (ET)