P1400
Sub-Throttle Position Sensor
1990-2000 Lexus LS 400 4.0L V8
Moderate SeverityPowertrain
Description
The ECM detected a malfunction in the sub-throttle position sensor circuit.
Symptoms
- CEL
- Poor throttle response
- Reduced power
- Idle fluctuation
Common Causes
- Faulty sub-TPS
- Damaged wiring
- Throttle body contamination
- Faulty ECM
Diagnostic Steps
- Test sensor voltage
- Inspect connector
- Clean throttle body
- Compare to specs
Repair Notes
Replace sub-throttle sensor or clean throttle body.
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
P1400 on Other Vehicles
Common Questions
What does code P1400 mean on a 1990-2000 Lexus LS 400?
P1400 stands for "Sub-Throttle Position Sensor". The ECM detected a malfunction in the sub-throttle position sensor circuit.
What are the symptoms of P1400 on a Lexus LS 400?
Common symptoms of P1400 include: CEL, Poor throttle response, Reduced power, Idle fluctuation.
What causes P1400 on a 1990-2000 Lexus LS 400?
Common causes of P1400 include: Faulty sub-TPS, Damaged wiring, Throttle body contamination, Faulty ECM.