Lexus Car ES, IS, LS 1998-06

4.3L V8 - Auto 3

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Trouble Code: P0156



HO2S-22 (Bank 2 Sensor 2) Circuit Malfunction

Possible Causes:



HO2S signal circuit is open between the sensor and the PCM
 
HO2S signal circuit is shorted to sensor or chassis ground
 
HO2S is damaged, contaminated or it has failed
 

Trouble Code: P0161



HO2S-22 (B2 S2) Heater Circuit Malfunction

Possible Causes:



HO2S heater control circuit is open, shorted to ground or power
 
HO2S heater power circuit is open (check power from the relay)
 
HO2S heater is damaged or has failed
 
PCM has failed
 

Trouble Code: P0171



Fuel System Too Lean (Bank 1)

Possible Causes:



A/FS or HO2S is contaminated, deteriorated or it has failed
 
Air leaks after the MAF sensor, or in the EGR or PCV system
 
Base engine "mechanical" fault affecting one or more cylinders
 
Exhaust leaks located in front of the A/FS or HO2S location
 
Fuel control sensor is out of calibration (i.e., ECT, IAT or MAP)
 
Fuel delivery system supplying too little fuel during cruise or idle periods (e.g., faulty fuel pump or dirty, restricted fuel filter)
 
Fuel injector (one or more) dirty or pressure regulator has failed
 
Vehicle driven low on fuel or until it ran out of fuel
 

Trouble Code: P0174



Fuel System Too Lean (Bank 2)

Possible Causes:



A/FS or HO2S is contaminated, deteriorated or it has failed
 
Air leaks after the MAF sensor, or in the EGR or PCV system
 
Base engine "mechanical" fault affecting one or more cylinders
 
Exhaust leaks located in front of the A/FS or HO2S location
 
Fuel control sensor is out of calibration (i.e., ECT, IAT or MAF)
 
Fuel delivery system supplying too little fuel during cruise or idle periods (e.g., faulty fuel pump or dirty, restricted fuel filter)
 
Fuel injector (one or more) dirty or pressure regulator has failed
 
MAF sensor is contaminated, out-of-calibration or damaged
 
Vehicle driven low on fuel or until it ran out of fuel
 

Trouble Code: P0175



Fuel System Too Rich (Bank 2)

Possible Causes:



A/FS or HO2S is contaminated, deteriorated or it has failed
 
Base engine "mechanical" fault affecting one or more cylinders
 
EVAP system component has failed or canister fuel saturated
 
Exhaust leaks located in front of the A/FS or HO2S location
 
Fuel control sensor is out of calibration (i.e., ECT, IAT or MAF)
 
Fuel delivery system supplying too much fuel during cruise or idle periods (e.g., faulty fuel pump, or faulty pressure regulator)
 
Fuel injector(s) is leaking or stuck partially open (one or more)
 

Trouble Code: P0220



Throttle Pedal Position Sensor/Switch 'B' Circuit Malfunction

Possible Causes:



TP sensor signal circuit open or shorted to ground
 
TP sensor ground circuit is open
 
TP sensor power circuit is open (check VREF circuit at PCM)
 
TP sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P0223



Throttle Pedal Position Sensor Switch B Circuit High Input

Possible Causes:



Electric TP sensor connector is damaged or open
 
Electric TP sensor circuit is open or shorted to VREF
 
Electric TP sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P0230



Fuel Pump Primary Circuit Malfunction

Possible Causes:



Circuit opening relay is damaged or has failed
 
Fuel pump relay control circuit is open or shorted to ground
 
Fuel pump relay is damaged or has failed
 
Fuel pump is damaged or has failed
 
PCM has failed
 

Trouble Code: P0300



Multiple Cylinder Misfire Detected

Possible Causes:



Air leak in the intake manifold, or in the EGR or PCV system
 
Base engine mechanical fault that affects two or more cylinders
 
EGR valve is stuck open or the PCV system has a vacuum leak
 
Fuel delivery component fault that affects two or more cylinders (e.g., contaminated, dirty or sticking fuel injectors)
 
Ignition system fault (coil or plug) that affects several cylinders
 
Mass airflow meter is contaminated, or its signal is out of range
 

Trouble Code: P0301



Cylinder 1 Misfire Detected

Possible Causes:



Base engine mechanical fault that affects only Cylinder 1
 
EGR valve is stuck open or the PCV system has a vacuum leak
 
Fuel component fault that affects only Cylinder 1 (a contaminated or sticking injector)
 
Ignition system problem (coil or plug) that affects Cylinder 1
 

Trouble Code: P0302



Cylinder 2 Misfire Detected

Possible Causes:



Base engine mechanical fault that affects only Cylinder 2
 
EGR valve is stuck open or the PCV system has a vacuum leak
 
Fuel component fault that affects only Cylinder 2 (a contaminated or sticking injector)
 
Ignition system problem (coil or plug) that affects Cylinder 2
 

Trouble Code: P0303



Cylinder 3 Misfire Detected

Possible Causes:



Base engine mechanical fault that affects only Cylinder 3
 
EGR valve is stuck open or the PCV system has a vacuum leak
 
Fuel component fault that affects only Cylinder 3 (a contaminated or sticking injector)
 
Ignition system problem (coil or plug) that affects Cylinder 3
 

Trouble Code: P0304



Cylinder 4 Misfire Detected

Possible Causes:



Base engine mechanical fault that affects only Cylinder 4
 
EGR valve is stuck open or the PCV system has a vacuum leak
 
Fuel component fault that affects only Cylinder 4 (a contaminated or sticking injector)
 
Ignition system problem (coil or plug) that affects Cylinder 4
 

Trouble Code: P0305



Cylinder 5 Misfire Detected

Trouble Code: P0306



Cylinder 6 Misfire Detected

Trouble Code: P0307



Cylinder 7 Misfire Detected

Possible Causes:



Base engine mechanical fault that affects only Cylinder 7
 
EGR valve is stuck open or the PCV system has a vacuum leak
 
Fuel delivery component fault that affects only Cylinder 7 (e.g., a contaminated, dirty or sticking fuel injector)
 
Ignition system problem (coil or plug) that affects Cylinder 7
 
Mass airflow meter is contaminated, or its signal is out of range
 

Trouble Code: P0308



Cylinder 8 Misfire Detected

Possible Causes:



Base engine mechanical fault that affects only Cylinder 8
 
EGR valve is stuck open or the PCV system has a vacuum leak
 
Fuel delivery component fault that affects only Cylinder 8 (e.g., a contaminated, dirty or sticking fuel injector)
 
Ignition system problem (coil or plug) that affects Cylinder 8
 
Mass airflow meter is contaminated, or its signal is out of range
 

Trouble Code: P0327



Knock Sensor 1 Circuit Low Input (Bank 1)

Possible Causes:



Verify that the Knock Sensor (KS) is tightened to specification
 
Knock sensor signal circuit is shorted to ground
 
Knock sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P0328



Knock Sensor 1 Circuit High Input (Bank 1)

Possible Causes:



Verify that the Knock Sensor (KS) is tightened to specification
 
Knock sensor signal circuit is open or shorted to power
 
Knock sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P0330



Knock Sensor 2 Circuit Malfunction

Possible Causes:



Knock sensor signal circuit is open, shorted to ground or VREF
 
Knock sensor is damaged, not tightened properly or has failed
 
PCM has failed
 

Trouble Code: P0332



Knock Sensor 2 Circuit Low Input (Bank 2)

Possible Causes:



Verify that the Knock Sensor (KS) is tightened to specification
 
Knock sensor signal circuit is shorted to ground
 
Knock sensor had failed, or the PCM has failed
 

Trouble Code: P0333



Knock Sensor 2 Circuit High Input (Bank 2)

Possible Causes:



Verify that the Knock Sensor (KS) is tightened to specification
 
Knock sensor signal circuit is open or shorted to power
 
Knock sensor has failed, or the PCM has failed
 

Trouble Code: P0339



Crankshaft Position Sensor 'A' Circuit Intermittent

Possible Causes:



CKP sensor signal circuit is open, shorted to ground or power
 
CKP Sensor signal ground circuit is open
 
Crankshaft timing pulley is damaged or out of alignment
 
CKP Sensor has failed, or the PCM has failed
 

Trouble Code: P0351



Ignition Coil No. 1 Primary/Secondary Circuit Malfunction

Possible Causes:



IGT1 circuit is open or shorted to ground
 
Ignition Coil No. 1 is damaged or it has failed
 
Problem present in the Ignition System
 
PCM has failed
 

Trouble Code: P0352



Ignition Coil No. 2 Primary/Secondary Circuit Malfunction

Possible Causes:



IGT2 circuit is open or shorted to ground
 
Ignition Coil No. 2 is damaged or it has failed
 
Problem present in the Ignition System
 
PCM has failed
 

Trouble Code: P0353



Ignition Coil No. 3 Primary/Secondary Circuit Malfunction

Possible Causes:



IGT3 circuit is open or shorted to ground
 
Ignition Coil No. 3 is damaged or it has failed
 
Problem present in the Ignition System
 
PCM has failed
 

Trouble Code: P0354



Ignition Coil No. 4 Primary/Secondary Circuit Malfunction

Possible Causes:



IGT4 circuit is open or shorted to ground
 
Ignition Coil No. 4 is damaged or it has failed
 
Problem present in the Ignition System
 
PCM has failed
 

Trouble Code: P0355



Ignition Coil No. 5 Primary/Secondary Circuit Malfunction

Possible Causes:



IGT5 circuit is open or shorted to ground
 
Ignition Coil No. 5 is damaged or it has failed
 
Problem present in the Ignition System
 
PCM has failed
 

Trouble Code: P0356



Ignition Coil No. 6 Primary/Secondary Circuit Malfunction

Possible Causes:



IGT6 circuit is open or shorted to ground
 
Ignition Coil No. 6 is damaged or it has failed
 
Problem present in the Ignition System
 
PCM has failed
 

Trouble Code: P0357



Ignition Coil No. 7 Primary/Secondary Circuit Malfunction

Possible Causes:



IGT7 circuit is open or shorted to ground
 
Ignition Coil No. 7 is damaged or it has failed
 
Problem present in the Ignition System
 
PCM has failed
 

Trouble Code: P0358



Ignition Coil No. 8 Primary/Secondary Circuit Malfunction

Possible Causes:



IGT8 circuit is open or shorted to ground
 
Ignition Coil No. 8 is damaged or it has failed
 
Problem present in the Ignition System
 
PCM has failed
 

Trouble Code: P0430



Catalyst Efficiency Below Normal (Bank 2)

Possible Causes:



Catalytic converter is damaged, contaminated or has failed
 
Front A/FS or rear HO2S is contaminated with fuel or moisture
 
Front A/FS or the rear HO2S is loose in its mounting hole
 
Front A/FS is older (aged) than the rear HO2S (HO2S is lazy)
 
Gas leaks at the exhaust manifold or in the exhaust pipes
 

Trouble Code: P0452



EVAP Vapor Pressure Sensor Circuit Low Input

Possible Causes:



Vapor pressure sensor connector is damaged or open
 
Vapor pressure sensor circuit is open
 
Vapor pressure sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P0453



EVAP Vapor Pressure Sensor Circuit High Input

Possible Causes:



Vapor pressure sensor connector is damaged or shorted
 
Vapor pressure sensor circuit is shorted to VREF
 
Vapor pressure sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P0456



EVAP System Very Small Leak (0.020") Detected

Possible Causes:



Canister Purge valve is damaged, leaking or has failed
 
Charcoal canister is loaded with fuel or moisture
 
Fuel filler cap loose, cross-threaded, incorrect part or damaged
 
Fuel tank is cracked (leaking), or a leak exists in the 'O' ring
 
Fuel tank pressure sensor is damaged or has failed
 
Fuel tank overfill check valve is cracked or is damaged
 
Fuel vapor line(s), fuel pipes or hoses damaged or leaking
 
PCM has failed
 

Trouble Code: P0503



Vehicle Speed Sensor 'A' Signal Erratic Or Intermittent

Possible Causes:



ABS ECU is damaged or has failed
 
Combination Meter is damaged or has failed
 
VSS signal circuit is open between the meter and the PCM
 
VSS signal circuit shorted to ground between meter and PCM
 

Trouble Code: P0504



Brake Switch 'A' To 'B' Correlation Malfunction

Possible Causes:



Stoplight switch signal circuit is shorted to power
 
Stoplight switch assembly is damaged or shorted
 
PCM has failed
 

Trouble Code: P0571



Brake Switch 'A' Circuit Malfunction

Possible Causes:



Stoplight switch signal circuit is shorted to power
 
Stoplight switch assembly is damaged or shorted
 
PCM has failed
 

Trouble Code: P0604



PCM Internal Control Module Random Access Memory Processing Error

Possible Causes:



Clear the codes and retest for this code. If the same code resets, substitute a known good control module and retest. If the trouble code is gone, the original PCM has failed.
 
TSB TC002-03 (6/03) contains information related to this code
 

Trouble Code: P0606



ECM/PCM Processing Error

Possible Causes:



Clear the codes and retest for this code. If the same code resets, substitute a known good control module and retest. If the trouble code is gone, the original PCM has failed.
 
TSB TC002-03 (6/03) contains information related to this code
 

 
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