HOSE AS 9W4582 - Caterpillar

System Operation Description:Use this procedure to troubleshoot the electrical system if a problem is suspected with the circuit for the prelube pump or if one of the diagnostic codes in Table 1 is active or easily repeated.
Table 1
Diagnostic Codes Table    
Code    Conditions which Generate this Code    System Response    
444-5 Starter Motor Relay : Current Below Normal     While the output driver is off for five seconds, the Electronic Control Module (ECM) detects an open in the circuit for the starting solenoid for more than five seconds.     The code is logged.
The engine will not crank.    
444-6 Starter Motor Relay : Current Above Normal     While the output driver is on for five seconds, the ECM detects a short in the circuit for the starting solenoid for more than five seconds.    The ECM contains the logic and the outputs that control the engine's prelubrication, start-up, and shutdown. The logic for starting and for stopping is customer programmable. The logic responds to inputs from the following components: engine control switch, emergency stop switch, remote start switch, data link and other inputs.The ECM supplies +Battery voltage to the starting motor's solenoid when the logic determines that it is necessary. The ECM removes the voltage when the crank terminate relay is energized. The voltage is also removed if the customer programmable "Overcrank Time" has expired.Logged diagnostics provide a historical record. Before you begin this procedure, use Caterpillar Electronic Technician (ET) to print the logged codes to a file.The most likely causes of the diagnostic code are a poor electrical connection or a problem in a wiring harness. The next likely cause is a problem with the starting motor's solenoid. The least likely cause is a problem with the ECM.The troubleshooting procedure may generate additional diagnostic codes. Keep your mind on correcting the cause of the original diagnostic code. Clear the diagnostic codes after the problem is resolved.
Illustration 1 g01436710
Schematic for the starting motor's solenoid on the in-line engines and the vee enginesTest Step 1. Inspect the Electrical Connectors and Wiring
Illustration 2 g01431198
Terminal Box (1) ECM connector J2/P2 (2) ECM connector J1/P1 (3) 16 amp circuit breaker (4) Connectors J3/P3 for the customer's connector (5) Connectors J4/P4 for the optional control panel (if equipped) or for a customer's connector (6) J5/P5 connectors for the harness (7) J6/P6 connectors for the harness
Turn the engine control switch to the OFF/RESET position. Switch the 16 amp circuit breaker for the ECM OFF.Note: For the following steps, refer to Troubleshooting, "Electrical Connectors - Inspect".
Illustration 3 g01436714
P2 ECM terminals that are used by the start circuit on in-line engines and vee engines (P2-10)