FILTER-OIL 2237809 - 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)The P1-30 (output 1) can be used as an output for the PTO switch on lamp or as an output for the coolant level sensor's warning 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 1" and 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 the PTO Switch On LampOne terminal of the PTO switch on lamp must be connected to +Battery voltage through the vehicle wiring. The other terminal is connected to the Engine Control Module (ECM) at terminal P1-30.A low side ECM driver is used at terminal P1-30 to control the operation of the lamp.
Illustration 1 g01254412
Schematic for PTO switch on lamp
If terminal P1-30 (output 1) of the ECM is used for another function, a lamp that operates independently of the ECM may be used. A double-pole switch can be used for the PTO on/off switch. Wire the circuit for the PTO switch on lamp to one of the on/off poles of the double-pole switch. The other poles of the switch are used for the circuit of the PTO on/off switch.
Illustration 2 g01254413
Optional circuit for PTO switch on lamp
Note: The following troubleshooting procedure can only be used to diagnose the circuit that is shown in Illustration 1. For information that is related to troubleshooting this wiring, return the vehicle to the OEM dealer for the repair.Test Step 1. Inspect the Electrical Connectors and the Wiring
Turn the keyswitch to the OFF position.
Illustration 3 g01186024
Location of the J1/P1 ECM connectors (typical left side engine view)
Thoroughly inspect the J1/P1 ECM connector and the vehicle's firewall bulkhead connector. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
Illustration 4 g01255310
Terminal locations at the P1 ECM connector for the PTO switch on lamp
(P1-30) Output No. 1
Perform a 45 N (10 lb) pull test on each of the wires in the ECM connector that are associated with the lamp circuit.
Check the allen head screw for each of the ECM connectors for the proper torque. Refer to Troubleshooting, "Electrical Connectors - Inspect" for the correct torque values.
Check the harness and wiring for abrasion and for 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 and of pinch points.Results:
OK - The harness and connectors appear to be OK. Proceed to Test Step 2.
Not OK