1A-157 Engine General Information and Diagnosis:
DTC P0601 / P0602 / P0607: Internal Control Module Memory Check Sum Error / Control Module
Programming Error / Control Module Performance
S5JB0A1104053
System Description
Internal control module is installed in ECM.
DTC Detecting Condition and Trouble Area
DTC Confirmation Procedure
1) Connect scan tool to DLC with ignition switch turned OFF.
2) Turn ON ignition switch and clear DTC, pending DTC and freeze frame data by using scan tool.
3) Start engine and run it at idle if possible.
4) Check DTC and pending DTC by using scan tool.
DTC Troubleshooting
NOTE
Before this trouble shooting is performed, read the precautions for DTC troubleshooting referring to
“Precautions For DTC Troubleshooting: ”.
5
A/C refrigerant pressure sensor ground circuit check
1) Turn OFF ignition switch, measure resistance between
engine ground and “GRY/GRN” wire terminal of A/C
refrigerant pressure sensor connector.
Is resistance below 5
Ω
?
Go to Step 7.
Go to Step 6.
6
ECM ground circuit check
1) Remove ECM from its bracket with ECM connectors
connected.
2) Measure resistance between engine ground and “C37-
57” terminal of ECM connector.
Is resistance below 5
Ω
?
“GRY/GRN” wire is
open or high resistance
circuit.
ECM grounds “C37-58”,
“C37-48”, “C37-30”,
“C37-29” and/or “C37-
15” is open or high
resistance circuit.
7
A/C refrigerant pressure sensor check
1) Check A/C refrigerant pressure sensor referring to “A/C
Refrigerant Pressure Sensor and Its Circuit Inspection:
in Section 7B”
Is it good condition?
Substitute a known-
good ECM and recheck.
Faulty A/C refrigerant
pressure sensor.
Step
Action
Yes
No
DTC detecting condition
Trouble area
DTC P0601:
Data write error or check sum error
(1 driving cycle detection logic)
DTC P0602:
Data programming error
(1 driving cycle detection logic)
DTC P0607:
Data programming error
(1 driving cycle detection logic)
ECM
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