PIN-CONNECTOR 1441636 - Caterpillar

System Operation Description:Use this procedure to troubleshoot the electrical system if a problem is suspected with the power to the engine's Electronic Control Module (ECM) or if any one of the diagnostic codes or the event code in Table 1 is active or easily repeated. Refer to Troubleshooting, "Event Codes" for information about event codes and the default trip points for these codes. You must access the monitoring system on Caterpillar Electronic Technician (ET) in order to view the current trip points for these codes.
Table 1
Diagnostic Codes Table
Code and Description Conditions which Generate this Code System Response
E043(1) Low System Voltage Warning The battery supply voltage is less than 20 VDC for ten seconds. The code is logged.
168-0 Electrical System Voltage high - most severe (3) The battery supply voltage is greater than 32 VDC for 0.5 seconds.
The engine is not being cranked.
168-1 Electrical System Voltage low - most severe (3) The battery supply voltage is less than 18 VDC for 0.5 seconds.
The engine is not being cranked.
168-2 Electrical System Voltage erratic, intermittent, or incorrect The engine is running but not cranking. The battery supply voltage is less than 18 VDC for at least .06 seconds. Three times in the last seven seconds, the battery supply voltage was less than 18 VDC. The engine has a Primary ECM and a Secondary ECM. The electrical power to the primary ECM comes through the breaker for the primary ECM and the contact of relay "R2A". The electrical power to the secondary ECM comes through the breaker for the secondary ECM and the contact of relay "R2". Power goes to pin P1-53 and pin P1-52 of the ECM(s). The −Battery comes through the breakers for the primary ECM and the secondary ECM. The −Battery connects to pin P1-63 and pin P1-65 of the ECM(s). The Engine Control Switch (ECS) sends a signal to pin P1-70 on the primary ECM and to pin P1-70 on the secondary ECM when the ECS is in the following positions: REMOTE, STOP and START. When the primary ECM senses battery voltage on pin P1-70 of the primary ECM, the primary ECM will power up. When the secondary ECM senses battery voltage on pin P1-70 of the secondary ECM, the secondary ECM will power up. When the ECS is in the OFF/RESET position, voltage is not present on these inputs and the ECM(s) will power down.If an emergency shutdown occurs, circuitry will energize relay "R2" and relay "R2A". When these two relays are energized the contacts of the relays will open. When the contacts of the relays open, battery power is removed from the ECM(s).In order to restart the engine, the operator must correct the cause of the emergency shutdown. The Engine Control Switch (ECS) must be turned to the OFF/RESET position. This resets the electrical circuits in the circuit. In addition to turning the ECS to the OFF/RESET position, the operator must manually open the air shutoff valves before starting the engine.The presence of two +Battery connections