RENR5042-02 33 Troubleshooting Section Recommended Actions Starting Motor Solenoid or Starting Circuit Electrical Power to the ECM 1. Turn the keyswitch OFF. 1. Test the operation of the starting motor solenoid. 2. Check the positive battery and negative battery connections to the ECM. 2. Check the engine wiring to the starting motor solenoid. 3. Perform a pull test on positive battery wires and negative battery wires. 3. Test the operation of the starting motor. 4. Inspect the starter motor pinion and the flywheel ring gear for damage. 4. Check the negative battery connection to the engine ground. Engine Speed/Timing Sensors 5. Turn the keyswitch ON. 6.
The warning lamps should illuminate for five seconds. Observe the engine speed on Cat ET while the engine is being cranked. This situation may require a direct hookup to the batteries in order to power Cat ET while the engine is cranking. Refer to Illustration 9 for the wiring diagram. If the warning lamp illuminates for five seconds, continue with this procedure. If the warning lamp does not illuminate for five seconds, refer to Troubleshooting, “Electrical Power Supply Circuit - Test”. Flash File If a new ECM has been installed on the engine, the engine will not start.
The ECM will not communicate with the Caterpillar Electronic Technician (ET) until the correct flash file has been loaded into the ECM. Check for a 253-02 Personality Module mismatch diagnostic code. If the code is active, load the correct flash file into the ECM. Refer to Troubleshooting, “Flash Programming”. Remote Shutdown Switch Access the screen on Cat ET that displays the remote shutdown switch status. The remote shutdown switch status on Cat ET is called “User Shutdown”. Table 12 If the voltage is not in the proper range, refer to Troubleshooting, “Remote Shutdown Switch Circuit - Test”.
Air Shutoff Circuit Refer to Troubleshooting, “Air Shutoff System - Test” for additional information. “User Shutdown Status” Switch Status Measured Voltage at P1-44 or P6-27 ON Negative battery OFF Open circuit >10 VDC