118 RENR5042-02 Troubleshooting Section Repair: Repair the wires and/or the connector, when possible. Replace parts, if necessary. Verify that the problem is resolved. i02289851 ECM/Personality Module - Test STOP. SMCS Code: 1902-038 Test Step 7. Check the +8 V Supply at the ECM System Operation Description: The Electronic Control Module (ECM) is the computer that controls the Caterpillar engine. The flash file contains the software that controls the operation of the ECM. A. Remove terminal 4 from the P1 connector. Install a jumper wire with socket terminals on both ends into P1-4. B. Remove terminal 5 from the P1 connector. Install a jumper wire with socket terminals on both ends into P1-5.
The flash file is the instructions that are used by the ECM to control the engine. For this reason, updating the flash file to a different version may affect some engine functions. C. Connect the P1 connector. D. Turn the keyswitch to the ON position. This procedure covers the following diagnostic codes: 253-02 Personality Module mismatch E. Measure the voltage between the jumper wires in P1-4 and P1-5. 268-02 Check Programmable Parameters F. Turn the keyswitch to the OFF position. Also, use this procedure to troubleshoot the following conditions: G. Restore all wiring to the original configuration. Expected Result:
The integrity of the customer parameters or the system parameters in the Electronic Control Module (ECM) is questionable. The voltage measurement is 8.0 ± 0.4 VDC. The data for the engine lifetime totals is questionable. Results: Test Step 1. Inspect the Electrical Connectors and the Wiring OK – The voltage measurement is 8.0 ± 0.4 VDC. Repair: Clear all diagnostic codes. Check for active diagnostic codes. If the problem is intermittent, refer to Troubleshooting, “Electrical Connectors - Inspect”. A. Turn the keyswitch to the OFF position. STOP. Not OK The voltage measurement is not 8.0 ± 0.4 VDC. Repair: Replace the ECM. Refer to Troubleshooting, “Replacing the ECM”. STOP.