NUT 5W9419 - Caterpillar

System Operation Description:Use this procedure under the following situation:Use this procedure to determine if the circuit for the starting aid switch is operating correctly.The following background information is related to this procedure:The ECM can use various inputs in a number of ways. The inputs depend on the parameter programming. Certain features are available on several different inputs. The configuration for the switch must match the actual switch installation in order for the switch to function properly."Starting Aid On/Off Switch"A starting aid feature that is controlled by the ECM is available with NOV99 and newer software.The starting aid system does not require a switch for automatic operation. A switch can be installed in order to allow the operator to override the automatic starting aid. If a switch is installed and the "starting aid On/Off switch" parameter is programmed to the corresponding switch input, the switch will control the starting aid system. The starting aid system will automatically enable the starting aid output when the switch is in the ON position. However, the conditions must require the use of a starting aid. When the switch is in the OFF position, the starting aid system will not function. If the "Starting Aid On/Off Switch" parameter is programmed to "None" (default), this feature is not used. The "Starting Aid On/Off Switch" parameter should be programmed to one of the inputs (J1/P1:7, J1/P1:47, J1/P1:6, J1/P1:46). Also, the switch circuit should be connected to the same input option.Note: The wiring for your particular application may be slightly different. The sensor common circuits are used interchangeably by the OEM of the vehicle. The following circuits are common within the ECM:
The "Input Sensor Common 1" is terminal 18.
The "Input Sensor Common 2" is terminal 3.
The "AP Sensor/Switch Sensor Common" is terminal 5.
Illustration 1 g00682699
Schematic for the Starting Aid Switch
Illustration 2 g00682618
Terminal Locations for the ECMTest Step 1. Check the Electrical Connectors and the Wiring
Thoroughly inspect the ECM vehicle harness connector J1/P1, the connectors, and the firewall bulkhead connectors. 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 circuit for the starting aid switch.
Check the ECM connector (allen head screw) for the proper torque of 6.0 N m (55 lb in).
Check the harness and the wiring for abrasion and pinch points from the battery to the ECM. Then, check from