FITTING 1108827 - Caterpillar

The EMCP II monitors battery voltage in order to protect the EMCP II in case of a problem with the battery or battery charging. The information on the battery voltage is received from the engine ECM by the CAT data link. If a diagnostic code for the engine ECM exists, then see the topic "P-503" in Troubleshooting, SENR1003, "3500B EPG Engines" before doing the following procedure.Note: The GSC does not receive battery power when the ECS is in the OFF/RESET position. Unless contacts "6" and "9" of the ECS are jumpered together.The GSC treats a CID 168 as an alarm fault.ProcedureThe GSC receives information on the battery voltage from the engine ECM by the CAT data link. Therefore, see the topic "P-503" in Troubleshooting, SENR1003, "3500B EPG Engines" for a FMI 4. The setpoint for system voltage (P07) specifies the battery voltage as "0" for 24 volts and "1" for 32 volts. Clear the diagnostic code from the fault log after troubleshooting is complete.The following table defines the possible causes of the various CID 168 that are displayed by the engine ECM and the GSC:
Table 1
Possible Causes For CID 168    
Displayed On    Diagnostic Code    Battery Voltage Thresholds (24 Volt Battery System)    Battery Voltage Thresholds (24 Volt And 32 Volt Systems)    
Engine ECM     168 E 00     Engine is running, and battery voltage is greater than 32 DCV for at least two seconds    
Engine ECM     168 E 01     Engine is not running, and battery voltage is less than 9 DCV for two seconds    
Engine ECM     168 E 02     Engine running or not, and battery voltage is less than 9 DCV for 0.06 seconds and returns, or battery voltage is less than 9 DCV three times in the last seven seconds    
GSC     168 03     Engine is running or not, and battery voltage is greater than 32 DCV for a 24 volt systems or 45 DCV for a 32 volt systems    
GSC     168 04     Engine is running or not, and battery voltage is less than 18 DCV for both a 24 and a 32 volt systems.    This diagnostic code is recorded when the battery voltage is less than 18 DCV. The setpoint for system voltage (P07) specifies the battery voltage as "0" for 24 volts and "1" for 32 volts. Clear the diagnostic code from the fault log after troubleshooting is complete.This procedure is used for troubleshooting an active fault or an inactive fault. Active alarm faults are shown on the upper display when the alarm codes key is pressed and the ECS is in any position except the OFF/RESET position. Inactive alarm faults are viewed in the fault log while the operator is in service mode. See Systems Operation, "Fault Log Viewing OP1".
Verify the fault.
View the upper display and check for active