SEAL AS 9J4981 - Caterpillar

System Operation Description:Use this procedure under the following situation:Use this procedure in order to determine if the circuit for the starting aid output is operating properly.The following background information is related to this procedure:Output 2 is available to connect a relay and/or a solenoid in order to control a starting aid system. The parameter "Starting Aid Output" must be programmed to "Automatic" in order to use output 2 as a starting aid output. Typical starting aid systems inject ether into the inlet manifold in order to aid starting of the engine during cold weather operation. The output is automatically controlled by the Engine Control Module (ECM). The reading from the coolant temperature sensor is used to determine if conditions require the use of the starting aid. If a fault condition exists with the circuit for the coolant temperature sensor, the reading from the inlet manifold temperature sensor will be used. The starting aid output will be enabled for a maximum of 30 seconds while the engine is cranking and the temperature reading is below 0 °C (32 °F). The starting aid output will be disabled if the engine speed rises above 500 rpm. The starting aid output will also be disabled if a condition that prevents fuel injection occurs.Interaction of the Air Inlet Heater and the Starting Aid Output (Ether)When the keyswitch is turned to the ON position, the air inlet heater will not be activated if the output of the starting aid is programmed to "Automatic", and if the inlet air temperature is below 0 °C (32 °F). The air inlet heater will not be activated when the starting aid circuit is activated. When the output of the starting aid is programmed to "Automatic", the air inlet heater will not be activated until the engine is running and the starting aid output has been turned off for five seconds.
Illustration 1 g00838120
Schematic for the starting aid circuitTest Step 1. Inspect Electrical Connectors and Wiring
Illustration 2 g01152490
Pin locations on ECM connector (P1-10) Output 2 (starting aid)
Thoroughly inspect ECM vehicle harness connector J1/P1, and the firewall bulkhead connector.Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
Perform a 45 N (10 lb) pull test on terminal 10 in the ECM connector.
Check the ECM connector (allen head screw) for the proper torque. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
Check the harness and wiring for abrasion and for pinch points from the sensor 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 or of pinch points.Results:
OK - Proceed to Test Step 2.
Not OK - Repair: Perform the following repair:Repair the connectors or wiring and/or replace the connectors or wiring. Ensure that all of the seals are properly in place and ensure that the connectors are completely coupled.Verify that the repair eliminates the problem.STOPTest Step 2. Use Caterpillar Electronic Technician (ET) to Check the Relay
Connect Cat ET to the cab data link connector.
Turn the ignition keyswitch to the ON