1A-30 Engine General Information and Diagnosis:
DTC Detecting Condition
When ECM receives a trouble code from TCM, which indicates that some problem occurred in sensor circuits and its
calculated values used for operations such as idle speed control, engine power control, and so on by TCM, ECM sets
DTC P1603. (TCM outputs the trouble code to ECM when TCM can not compute the engine control signal due to
malfunctions of sensor circuits used for gear shift control.)
DTC Troubleshooting
NOTE
Before this trouble shooting is performed, read the precautions for DTC troubleshooting referring to
“Precautions For DTC Troubleshooting: in related manual”.
Step Action Yes No
1 Was “Engine and Emission Control System Check”
performed?
Go to Step 2. Go to “Engine and
Emission Control
System Check: in
related manual”.
2 DTC check
1) Check DTC of TCM referring to “DTC Check: in Section
5A in related manual”.
Is there any DTC(s)?
Go to applicable DTC
diag. flow.
Substitute a known-
good ECM and recheck.
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