P1633critical severityPowertrain
ECM Malfunction ETCS Circuit
on 2012 Toyota Matrix 2.4L I4 · FWD
What this code means
Internal ECM fault related to the Electronic Throttle Control System processor.
Symptoms
- CEL
- Limp mode
- Severely limited throttle
- Idle only
- Reduced power
Common causes
- Internal ECM ETCS failure
- Power supply issues
- ECM overheating
Diagnostic steps
- Check ECM voltage supply
- Monitor ETCS signals
- Test throttle body
- Check for overheating
Repair notes
Replace ECM.
Other Powertrain codes on this vehicle
P0070
Ambient Air Temperature Sensor Circuit
P0071
Ambient Air Temperature Sensor Range/Performance
P0072
Ambient Air Temperature Sensor Circuit Low
P0073
Ambient Air Temperature Sensor Circuit High
P0115
Engine Coolant Temperature (ECT) Sensor 1 Circuit
P0116
ECT Sensor 1 Circuit Range/Performance
P0117
ECT Sensor 1 Circuit Low Input
P0118
ECT Sensor 1 Circuit High Input
P0119
ECT Sensor 1 Circuit Intermittent
P0125
Insufficient Coolant Temperature for Closed Loop Fuel Control