Isuzu engine C22NE / 22LE / 20LE. Manual — part 99
DRIVEABILITY AND EMISSIONS 6E1-225
DIAGNOSTIC TROUBLE CODE DTC (Flash DTC=51)
ELECTRICALLY PROGRAMMABLE READ-ONLY MEMORY (EPROM) ERROR
Circuit Description
The Engine control module (ECM) used in this vehicle
utilizes an electrically programmable read- only
memory (EPROM). The EPROM contains program ID-
Calibration variable.
This malfunction checks the integrity of the EPROM
(ECM will not run), then DTC 51 will set.
Conditions for Setting the DTC
• If calculated check sum is not equal to the stored
check sum.
Action Taken When the DTC Sets
• The ECM will illuminate the malfunction indicator
lamp (MIL) the first time the malfunction is detected.
Conditions for Clearing the MIL/DTC
• Once the ECM determines that a fault(s) has been
rectified then the CEL will switch OFF, although the
fault code will remain in the ECM memory.
Any fault codes will remain in ECM memory until -
1. They are cleared by disconnecting the Battery
for more than 30 seconds.
2. A service tool such as Tech 2 is used to clear
them.
3. Ten consecutive starts without logging a fault.
Diagnostic Aids
• Diagnostic Trouble Code 51 indicates that the ECM
will not run. The only possible repair is the EPROM
or ECM replacement.
6E1-226 DRIVEABILITY AND EMISSIONS
DTC (Flash DTC = 51)
Electrically Programmable Read-Only Memory (EPROM) Error
Action
Value(s)
Yes
No
Was the "On-Board Diagnostic (OBD) System Check" performed?
-
Go to step 2
Go to OBD
System
Check
Refer to Service Bulletins.
Is there still a problem?
-
Go to step 3
Verify Repair
Replace the EPROM or ECM.
Is the action complerte?
Note) Refer to 6E1-243.
Verify Repair
-
DRIVEABILITY AND EMISSIONS 6E1-227
DIAGNOSTIC TROUBLE CODE DTC (Flash DTC = 55)
ELECTRICALLY ERASABLE PROGRAMMABLE READ-ONLY MEMORY (EEPROM) ERROR
Circuit Description
The Engine control module (ECM) used in this vehicle
utilizes an electrically erasable programmable read-
only memory (EEPROM). The EEPROM contains
program information and the calibrations required for
engine, diagnostics operation.
This malfunction checks the integrity of
microprocessor config resister located in the
EEPROM (ECM will not run), then DTC 55 will set.
Conditions for Setting the DTC
• The ECM detects an internal program fault.
Action Taken When the DTC Sets
• The ECM will illuminate the malfunction indicator
lamp (MIL) the first time the malfunction is detected.
Conditions for Clearing the MIL/DTC
• Once the ECM determines that a fault(s) has been
rectified then the CEL will switch OFF, although the
fault code will remain in the ECM memory.
Any fault codes will remain in ECM memory until -
1. They are cleared by disconnecting the Battery
for more than 30 seconds.
2. A service tool such as Tech 2 is used to clear
them.
3. Ten consecutive starts without logging a fault.
Diagnostic Aids
• Diagnostic Trouble Code 55 indicates that ECM will
not run. The only possible repair is the EPROM or
ECM replacement.
6E1-228 DRIVEABILITY AND EMISSIONS
DTC (Flash DTC = 55)
Electrically Erasable Programmable Read-Only Memory Error
Action
Value(s)
Yes
No
Was the "On-Board Diagnostic (OBD) System Check" performed?
-
Go to step 2
Go to OBD
System
Check
Refer to Service Bulletins.
Is there still a problem?
-
Go to step 3
Verify Repair
Replace the EPROM or ECM.
Is the action complerte?
Note) Refer to 6E1-243.
Verify Repair
-
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