Isuzu 1999 RODEO Workshop Manual page 928

DTC P0601 Internal Control Module Memory Check Sum Error
Step
1 Was the "On–Board Diagnostic (OBD) System Check"
performed?
2 Reprogram PCM with most recent calibrations. Refer
to Service Bulletins and PCM Reprogramming.
Is there still a problem?
3 Replace the PCM.
IMPORTANT: The
programmed. Refer to On–Vehicle Service in
Powertrain Control
procedures.
And also refer to latest Service Bulletin.
Check to see if the Latest software is released or not.
And then Down Load the LATEST PROGRAMMED
SOFTWARE to the replacement PCM.
Is the action complete?
RODEO X22SE 2.2L ENGINE DRIVEABILITY AND EMISSION
Action
replacement PCM must
Module and Sensors
Value(s)
— Go to Step 2
— Go to Step 3
be
for
— Verify repair
6E1–301
Yes No
Go to OBD
System
Check
Verify repair
—