Caterpillar — Fault Identification Procedure

Testing & diagnosis · PRCM

From a Caterpillar service manual — check it applies to your exact model before use.

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Procedure

1. Determine the LED display that is active on the left side of the PRCM (1), (2), or (3).
2. View the diagnostic code on the upper display; press MODE if necessary.
3. Note the status of the DIAG display area: BLANK, FLASHING, or CONTINUOUSLY ON.
4. Use the first column of table 4 and identify a condition from step 3.
5. Use the second column of table 4 to find the diagnostic code on the upper display.
6. Use the third column of table 4 which describes the status of the DIAG indicator.
7. Read the last column to find the type of diagnostic code.

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.

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