PISTON 4I3614 - Caterpillar

System Operation Description:Use this procedure under the following situation:Use the following information in order to determine if the warning lamp is operating incorrectly:The following background information is related to the following procedure:Warning Lamp OperationA warning lamp is required if the "Engine Monitoring" feature is used. The warning lamp indicates an active problem with one of the monitored conditions such as high coolant temperature. A flashing warning lamp indicates that the engine is derating power. The warning lamp will turn on for a minimum of two seconds after the engine has started.An option is available for the "GM Truck Manufacturer" configuration that allows the output for warning lamp to be configured as an output for a warning lamp for high coolant temperature. The "Engine Monitoring Lamps" parameter must be programmed to the "Warning Lamp" option for standard operation of engine monitoring. If the "Engine Monitoring Lamps" parameter is programmed to the "HIgh Coolant Temp Warning Lamp" option, the output is used as an interface to the GM shutdown system.Operation Of Engine MonitoringWhen the ECM has detected an engine condition that exceeds the acceptable limits, the warning lamp will turn on. The activation of the lamp depends on the existing conditions and the programming of the parameter for "Engine Monitoring". The lamp will activate in one of the following modes:
The lamp not only turns on, but the lamp stays on.
The lamp will flash on and off.If the lamp turns on continuously, the engine is in warning mode. If the lamp begins to flash, the ECM has begun to derate engine speed, vehicle speed, or power.If the parameter for Engine Monitoring is programmed to "", the lamp will not flash. The lamp only flashes when the engine is programmed to "DERATE" or "SHUTDOWN".If the Customer Parameter for Engine Monitoring is programmed to "", "DERATE", or "SHUTDOWN" the lamp will turn on when a warning condition exists. The lamp will be turned on continuously while a warning condition exists.If the Customer Parameter for Engine Monitoring is programmed to "DERATE" or "SHUTDOWN", the lamp flashes whenever Engine Monitoring is derating engine speed, vehicle speed, and power.If the Customer Parameter for Engine Monitoring is programmed to "SHUTDOWN", the warning lamp will continue flashing after the derate mode until the engine is shut down. Refer to Troubleshooting, "System Overview".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 ECM at the ECM vehicle harness connector J1/P1:29 (warning lamp).The ECM provides a path to ground in order to turn the lamp ON.
Illustration 1 g00769338
Circuit schematic for the warning lamp
Illustration 2 g00769348
Pin locations for the warning lamp circuitTest Step 1. Inspect Electrical Connectors and Wiring
Thoroughly inspect ECM vehicle harness connector J1/P1, the firewall bulkhead connector, and terminal 29. Refer to Illustration 2. 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 is associated with the suspect terminal