User's Manual

Table 14
FMI 03 Troubleshooting
Troubleshooting Test Steps Values Results
1. FLASH THE ECM
A. Load the latest software file for the MSS into
the ECM. Refer to Testing and Adjusting,
“Electronic Control Module (ECM) - Flash
Program”.
B. Clear the diagnostic code log.
C. Start the machine and operate the machine.
D. Determine if FMI 03 is present.
FMI 03 is present.
OK - FMI 03 is present.
Go to Test Step 2.
NOT OK - The diagnostic code was caused by
a problem in the software.
STOP.
2. TEST THE MACHINE HARNESS
A. The key start switch must be in the OFF
position.
B. Disconnect the machine harness from the
MSS3s ECM.
C. Measure the voltage between the pins on
the connector for the MSS3s ECM.
a. For CID 1391 Driver #1 pins 42 and 58.
b. For CID 1392 Driver #2 pins 42 and 40.
Voltage is present.
OK - Voltage is present between the pins. The
wiring harness is shorted.
Repair: Repair or replace the machine
harness.
STOP.
NOT OK - Voltage is not present between the
pins.
Go to Test Step 3.
3. CHECK THE ECM
A. Remove the pin from the 70 pin connector
of the MSS3s ECM.
a. CID 1391 pin 58.
b. CID 1392 pin 40.
B. Reconnect the MSS3s ECM to the system.
C. Use the Cat
®
ET to check the diagnostic
codes.
FMI 03 is active.
OK - FMI 03 is active.
Repair: The MSS3s ECM has an internal fail-
ure. Replace the ECM. Refer to Testing and
Adjusting, “ECM - Replace”. Return the failed
ECM to Caterpillar. Enclose a note with the fol-
lowing message: “The ECM has suffered an in-
ternal short to battery voltage.”
STOP.
NOT OK - FMI 03 is NOT active.
Repair: The MSS3s ECM has an internal fail-
ure. Replace the ECM. Refer to Testing and
Adjusting, “ECM - Replace”. Return the failed
ECM to Caterpillar. Enclose a note with the fol-
lowing message: “The ECM has suffered a
short to battery voltage in the driver (#1 or #2)
circuit.”
STOP.
UENR7061 41
Circuit Tests