Electronic Control Module (ECM) on Certain C7.1, C6.6 and C4.4 Machine Engines{1901, 1920} Caterpillar

Backhoe Loader:

416F (S/N: KSF393-573)

420F (S/N: JWJ741-837; SKR806-1153)

430F (S/N: RDF271-289; RGS269-269)

Excavator:

329E L (S/N: TST470-476; PLW913-984)

Motor Grader:

120M Series 2 (S/N: M9C285-294; M9H240-245; R9W113-113)

Track-Type Tractor:

D6N LGP (S/N: PBA499-512)

D6N XL (S/N: PER311-314)

Wheel Loader:

924K (S/N: PWR774-886)

930K (S/N: RHN1014-1117)

938K (S/N: SWL691-810)

950K (S/N: R4A895-905)

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 345-3381 Engine Electronic Control Gp , 345-3385 Engine Electronic Control Gp , 345-3388 Engine Electronic Control Gp , 340-8157 Engine Electronic Control Gp , and 357-2083 Engine Electronic Control Gp may present the following active fault codes:

J1939

• 3509-3 Sensor Supply Voltage 1 Voltage above Normal

• 678-3 8V DC Supply Voltage above Normal

CDL

• 262-3 Sensor Supply Voltage 1 Voltage above Normal

• 41-3 8V DC Supply Voltage above Normal

Other fault codes may appear depending upon the engine and machine configuration. Refer to the relevant Troubleshooting for more information. These codes may be caused by an issue with an internal component within the Electronic Control Module (ECM).

Solution

Illustration 1	g03239936
Typical example

If these codes are present, connect the electronic service tool. Read the engine ECM serial number (1) .

If the engine ECM serial number begins with four digits in the range of 1382 to 1792, then replace the ECM. Refer to Disassembly and Assembly, "Electronic Control Module - Remove and Install" for the correct procedure.