3406E and 3456 Generator Set Engines Caterpillar

The Electronic Control Module (ECM) detects the following conditions:

• Atmospheric pressure signal voltage is below 1.7 VDC for one second.

• The ECM has been powered for at least three seconds.

• Diagnostic codes (262-03) and 262-04 are not active.

System Response:

The ECM will log the diagnostic code. The ECM flags atmospheric pressure as invalid data and a default value of 45 kPa (6.5 psi) is used. The code may be viewed on a display module or on the Caterpillar Electronic Technician (ET).

Possible Performance Effect:

• Low power

Troubleshooting:

Test Step 1. Perform the following diagnostic procedure: "Engine Sensor Open/Short Circuit - Test"

Results:

• OK - STOP