Caterpillar — Test Step 2. Check for Active Diagnostic Codes
Testing & diagnosis · Engine ECM / sensors
From a Caterpillar service manual covering: 3500B Engine, PM3516, PM3516 Power Module. Check it applies to your exact model before use.
Applies to: Caterpillar 3500B engine
Procedure
- Connect the ET.
- Turn the ECS to the ON position. The engine should be OFF.
- Wait for 15 seconds for the CID-FMI.
- Determine the FMI and check for 262-03/262-04 and 263-03/263-04.
Tools required
- ET (Electronic Technician) Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Source: Caterpillar service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.