A False Diagnostic Code is Generated When Flashing Software in Some Excavators{1901, 1902, 7600, 7610, 7620} Caterpillar


A False Diagnostic Code is Generated When Flashing Software in Some Excavators{1901, 1902, 7600, 7610, 7620}

Usage:

345B 2NW
Excavator: D-Series Medium Excavators 320D-330D Large C-Series Excavators 345C-385C Large Excavators 345B-385B, and 5090B Medium Excavators 320C-330C D-Series Small Excavators 311D-319D

Introduction

The problem that is identified below does not have a known permanent solution. Until a permanent solution is known, use the solution that is identified below.

Problem

The functions of the machine's Electronic Control Module (ECM) are disabled during the flashing process. The engine ECM does not receive a throttle signal during the process. This causes the engine ECM to generate a false 91-8 Throttle Position Sensor abnormal frequency, pulse width, or period diagnostic code.

Occasionally, the machine ECM also generates a false diagnostic code after the flashing process. For example, a false 2300-9 Switch Panel abnormal update rate might be generated.

Solution

After flashing new software into a machine ECM, cycle the machine's keyswitch to the Off position for a minimum of one minute. Cycle the keyswitch before you operate the machine. The false diagnostic code will disappear after the keyswitch is cycled.

Verify that the diagnostic code has been erased. If a code continues to be generated, troubleshoot the code according to the appropriate Troubleshooting manual.

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