P1633
ECM Malfunction ETCS Circuit
1990-2000 Lexus LS 400 4.0L V8
Critical SeverityPowertrain
Description
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
- P0001Fuel Volume Regulator Control Circuit/Open
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0003Fuel Volume Regulator Control Circuit Low
- P0004Fuel Volume Regulator Control Circuit High
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
- P0011Intake Camshaft Position Timing Over-Advanced Bank 1
- P0012Intake Camshaft Position Timing Over-Retarded Bank 1
- P0013Exhaust Camshaft Position Actuator Circuit/Open Bank 1
- P0014Exhaust Camshaft Position Timing Over-Advanced Bank 1
- P0015Exhaust Camshaft Position Timing Over-Retarded Bank 1
P1633 on Other Vehicles
Common Questions
What does code P1633 mean on a 1990-2000 Lexus LS 400?
P1633 stands for "ECM Malfunction ETCS Circuit". Internal ECM fault related to the Electronic Throttle Control System processor.
What are the symptoms of P1633 on a Lexus LS 400?
Common symptoms of P1633 include: CEL, Limp mode, Severely limited throttle, Idle only, Reduced power.
What causes P1633 on a 1990-2000 Lexus LS 400?
Common causes of P1633 include: Internal ECM ETCS failure, Power supply issues, ECM overheating.