827895 Force SEAL-BOTTOM COWL

Table 1
Diagnostic Codes Table    
Description    Conditions which Generate this Code    System Response    
444-5 Starter Motor Relay current below normal     The Electronic Control Module (ECM) detects an open circuit and/or a short to the +Battery in the circuit for the SMMS. The ECM can only detect this condition when the SMMS is not energized.     The code is logged.    
444-6 Starter Motor Relay current above normal     The ECM detects a short circuit to ground in the circuit for the SMMS. The ECM can only detect this condition when the SMMS is energized.    In order to crank the engine, the ECM will send a signal to the Starting Motor Magnetic Switch (SMMS). Current will flow to the starting motor through the contacts of the SMMS. The starting motor will begin to crank the engine.Engine cranking can be initiated by several methods. The ECM can receive a request in order to crank the engine over the CAN data link from a device such as the Electronic Modular Control Panel 3 (EMCP 3). The ECM can receive a request in order to crank the engine from a hard wired switch input at J1-47. The SMMS can be energized directly by the crank override switch. The SMMS can be energized directly by an external starting motor control. Be sure that the "Engine State Control Input Configuration" is configured for the correct type of system. Refer to Troubleshooting, "Configuration Parameters".The ECM has ultimate control over the SMMS when the return current wire is connected to the J2-19 starter interlock terminal. This is done by controlling the sinking driver at the J2-19 starter interlock terminal of the ECM. This allows the ECM to prevent unwanted engagement of the starter gear to a moving flywheel ring gear regardless of the device that is sourcing current to the SMMS.When the ECM receives a request for starting the engine the ECM will first begin the process of engine prelubrication. When the engine prelubrication is complete, the ECM will start the first crank cycle. Note: If the configuration parameter "Prelube Duration" is set to zero seconds, the ECM will skip the process of prelubrication. The ECM will begin cranking the engine immediately. Refer to Troubleshooting, "Configuration Parameters" for the available range and default setting of this parameter.The ECM will crank the engine until the programmed "Crank Terminate Speed" has been reached. If the engine fails to reach the "Crank Terminate Speed" before the programmed "Crank Duration" period the ECM will stop cranking the engine. The ECM will then allow the starter to cool for a period that is equal to the "Crank Duration" before starting the next crank cycle. The process will be repeated for a number of times that is equal to the programmed "Maximum Number of Crank Cycles". When the "Maximum Number of Crank Cycles" has been reached, the process will be aborted and Caterpillar Electronic Technician (ET) will display "OVERCRANK". The process will be restarted when the next start request is received by the ECM.Refer to Troubleshooting, "Configuration Parameters" for the available ranges and default settings of the following parameters:
"Crank Duration"
"Crank Terminate Speed"
"Maximum Number of Crank Cycles"Note: If the "Crank Duration" or "Maximum Number of Crank Cycles" are programmed to 0 the ECM will not crank the engine.The engine can be manually started by using the customer's keyswitch or the crank override switch while keyswitch power is applied to J1-70 of the ECM.
Illustration 1 g01407953
Typical schematic
Illustration 2 g01408104
P2 ECM connector (59) Crank + (sourcing driver for the SMMS) (19) Starter Interlock (sinking driver for SMMC )
Illustration 3 g01408117
P1 ECM connector (P1-47) Momentary start switch input (P1-49) Momentary stop switch input (P1-63) -Battery (P1-70) Keyswitch
Illustration 4 g01408156
Location of ECM connectors (1) P2/J2 (2) P1/J1Test Step 1. Inspect Electrical Connectors and Wiring
Remove electrical power from the ECM.
Thoroughly inspect the ECM connectors. Inspect all of the other connectors for the circuit. 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.
Check the ECM connector (allen head screw) for the proper torque. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
Check the harness and the wiring for abrasion and for pinch points.Expected Result:All connectors, pins, and sockets are completely coupled and/or inserted. The harness and wiring are free of corrosion, of abrasion, and of pinch points.Results:
OK - The connectors and wiring are OK. Proceed to Test Step 2.
Not OK - There is a problem in the connectors and/or wiring.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. Check for Active Diagnostic Codes for the SMMS
Connect Cat ET to the service tool connector.
Restore electrical power to the ECM.
Monitor the active