Lexus GS, SC 1998-06

4.0L V8 VIN H Auto 2

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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

Possible Causes:



Base engine mechanical fault that affects only Cylinder 5
 
EGR valve is stuck open or the PCV system has a vacuum leak
 
Fuel delivery component fault that affects only Cylinder 5 (e.g., a contaminated, dirty or sticking fuel injector)
 
Ignition system problem (coil or plug) that affects Cylinder 5
 

Trouble Code: P0306



Cylinder 6 Misfire Detected

Possible Causes:



Base engine mechanical fault that affects only Cylinder 6
 
EGR valve is stuck open or the PCV system has a vacuum leak
 
Fuel delivery component fault that affects only Cylinder 6 (e.g., a contaminated, dirty or sticking fuel injector)
 
Ignition system problem (coil or plug) that affects Cylinder 6
 
Mass airflow meter is contaminated, or its signal is out of range
 

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: P0325



Knock Sensor 1 Circuit Malfunction

Possible Causes:



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

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:



Verify that the Knock Sensor (KS) is tightened to specification
 
Knock sensor signal circuit is open, shorted to ground or VREF
 
Knock sensor is damaged 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: P0335



Crankshaft Position Sensor 'A' Circuit Malfunction

Possible Causes:



CKP Sensor 'A' signal circuit is open, shorted to ground or shorted to system power
 
CKP Sensor 'A' signal ground circuit is open
 
CKP Sensor 'A' is damaged or 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: P0340



Camshaft Position Sensor Circuit Malfunction

Possible Causes:



CMP sensor signal circuit is open or shorted to ground
 
CMP sensor signal ground circuit is open
 
CMP sensor signal is shorted to VREF or system power
 
CMP sensor is damaged or has failed
 
PCM has failed
 
TSB EG010-02 (4/02) contains information related to this code
 

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: P0401



EGR System Insufficient Flow Detected

Possible Causes:



EGR gas temperature sensor circuit open or shorted to VREF
 
EGR gas temperature sensor is damaged or has failed
 
EGR valve is stuck in closed position
 
EGR valve vacuum hose is disconnected or leaking
 

Trouble Code: P0402



Excessive EGR Flow Detected

Possible Causes:



EGR gas temperature sensor circuit open or shorted to ground
 
EGR gas temperature sensor is damaged or has failed
 
EGR Vacuum Switching Valve (VSV) is damaged or has failed
 
EGR valve stuck partially or EGR valve stuck fully open
 
EGR VSV control circuit is open or shorted to system power
 
PCM has failed
 

Trouble Code: P0420



Catalyst Efficiency Below Normal (Bank 1)

Possible Causes:



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

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: P0440



EVAP Control System Large Leak (0.080") Detected

Possible Causes:



Charcoal canister is clogged, loaded with fuel or with moisture
 
Fuel filler cap missing, loose (not tightened) or the wrong part
 
Fuel tank over-fill check valve cracked or damaged
 
Fuel tank seal leaking, fuel tank cracked or damaged/leaking
 
Fuel vapor hoses/tubes blocked or restricted, or fuel vapor control valve tube or fuel vapor vent valve assembly blocked
 
Vacuum hose or tubing cracked, damaged or disconnected
 
Vapor Pressure sensor incorrectly installed
 
PCM has failed
 

Trouble Code: P0441



EVAP System Incorrect Purge Flow Detected

Possible Causes:



Charcoal canister is clogged, loaded with fuel or with moisture
 
Fuel tank over-fill check valve cracked or damaged
 
Fuel tank seal leaking, fuel tank cracked or damaged/leaking
 
Fuel vapor hoses/tubes blocked or restricted, or fuel vapor control valve tube or fuel vapor vent valve assembly blocked
 
Vacuum hose or tubing cracked, damaged or disconnected
 
Vapor pressure sensor is damaged or has failed
 
VSV circuit for the canister purge, VSV for the CCV or the VSV for the pressure switching valve is open or shorted to ground
 
VSV for the vapor pressure sensor circuit is open or shorted to ground, or the vapor pressure sensor is damaged or has failed
 

Trouble Code: P0442



EVAP System Small Leak (0.040") 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 vapor line(s), fuel pipes or hoses damaged or leaking
 
PCM has failed
 

Trouble Code: P0450



EVAP Vapor Pressure Sensor Circuit Malfunction

Possible Causes:



Vapor pressure sensor signal circuit open or shorted to ground
 
Vapor pressure sensor ground circuit is open
 
Vapor pressure sensor power circuit is open
 
Vapor pressure sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P0451



EVAP Vapor Pressure Sensor Range/Performance

Possible Causes:



Vapor pressure sensor vacuum hoses loose or damaged
 
Vapor pressure sensor is damaged or has failed
 
PCM has failed
 

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
 

 
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