Toyota Celica, Corolla, ECHO & MR2 1999-05

1.5L L4 - Auto 1

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1.5L L4 - Auto

Trouble Code: P0031



Heated Oxygen Sensor (Bank 1 Sensor 1) Heater Circuit Low Code

Possible Causes:



HO2S-11 heater control circuit is open
 
HO2S-11 heater assembly is damaged or has failed
 
PCM has failed
 

Trouble Code: P0032



Heated Oxygen Sensor (Bank 1 Sensor 1) Heater Circuit High Input

Possible Causes:



HO2S-11 heater control circuit is shorted to ground
 
HO2S-11 heater assembly is damaged or has failed
 
PCM has failed
 

Trouble Code: P0037



Heated Oxygen Sensor (Bank 1 Sensor 2) Heater Circuit Low Input

Possible Causes:



HO2S-12 heater control circuit is open
 
HO2S-12 heater assembly is damaged or has failed
 
PCM has failed
 

Trouble Code: P0038



Heated Oxygen Sensor (Bank 1 Sensor 2) Heater Circuit High Input

Possible Causes:



HO2S-12 heater control circuit is shorted to ground
 
HO2S-12 heater assembly is damaged or has failed
 
PCM has failed
 

Trouble Code: P0100



Mass Airflow Sensor Circuit Malfunction

Possible Causes:



MAF sensor signal circuit is open, shorted to ground or power
 
MAF sensor ground circuit is open between sensor and ground
 
MAF sensor power circuit is open (check the power to the relay)
 
MAF sensor has failed, or the PCM has failed
 

Trouble Code: P0110



Intake Air Temperature Sensor Circuit Malfunction

Possible Causes:



IAT sensor signal circuit is open, shorted to ground or VREF
 
IAT sensor ground circuit is open between sensor and ground
 
IAT sensor is contaminated, damaged or has failed
 
PCM has failed
 

Trouble Code: P0115



Engine Coolant Temperature Sensor Circuit Malfunction

Possible Causes:



IAT sensor signal circuit is open, shorted to ground or VREF
 
ECT sensor ground circuit is open between sensor and ground
 
ECT sensor is contaminated, damaged or has failed
 
PCM has failed
 

Trouble Code: P0116



Engine Coolant Temperature Sensor Range/Performance

Possible Causes:



Check for a low coolant level or an incorrect coolant mixture
 
ECT sensor signal circuit or ground circuit has high resistance
 
ECT sensor is contaminated, damaged or out-of-calibration
 
PCM has failed
 

Trouble Code: P0120



TP Sensor or Switch 'A' Circuit Malfunction

Possible Causes:



TP sensor signal circuit is open or shorted to ground
 
TP sensor ground circuit is open, or the power circuit is open
 
TP sensor is damaged or has failed
 

Trouble Code: P0121



TP Sensor or TP Switch 'A' Signal Range/Performance

Possible Causes:



TP sensor signal circuit open or shorted to ground (intermittent)
 
TP sensor is loose at it mounting or the throttle is binding
 
TP sensor is damaged or has failed (perform a sweep test)
 
PCM has failed
 

Trouble Code: P0125



Insufficient Coolant Temperature For Closed Loop:

Possible Causes:



Check the operation of the thermostat (it may be stuck open)
 
ECT sensor signal circuit has high resistance
 
ECT sensor has failed
 
Inspect for low coolant level or an incorrect coolant mixture
 

Trouble Code: P0128



Thermostat System Malfunction

Possible Causes:



Check the operation of the thermostat (it may be stuck open)
 
ECT sensor is out-of-calibration or skewed
 
Inspect for low coolant level or for an incorrect coolant mixture
 

Trouble Code: P0130



HO2S-11 (Bank 1 Sensor 1) 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 signal circuit is shorted to VREF or system power (B+)
 
HO2S is damaged, contaminated or it has failed
 
PCM has failed
 

Trouble Code: P0133



HO2S-11 (Bank 1 Sensor 1) Slow Response

Possible Causes:



HO2S signal circuit is open or shorted to ground
 
HO2S element is contaminated, or HO2S heater has failed
 
Intake air leaks, exhaust manifold leaks or PCV system leaks
 
MAF sensor out of calibration (it may be dirty or contaminated)
 

Trouble Code: P0135



HO2S-11 (Bank 1 Sensor 1) Heater Circuit Malfunction

Possible Causes:



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

Trouble Code: P0136



HO2S-12 (Bank 1 Sensor 2) Circuit Malfunction Code

Possible Causes:



HO2S signal circuit is open or shorted to ground
 
HO2S signal circuit shorted to VREF or system power (B+)
 
HO2S is damaged, contaminated or it has failed
 

Trouble Code: P0141



HO2S-12 (Bank 1 Sensor 2) 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 system supplying too little fuel during cruise or idle (faulty fuel pump or 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: P0172



Fuel System Too Rich (Bank 1)

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: 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 one or more cylinders
 
Erratic or interrupted CKP or CMP sensor signals
 
Fuel delivery component fault that affects one or more cylinders (e.g., a contaminated, dirty or sticking fuel injector)
 
Ignition system problem (coil or plug) in one or more cylinders
 
TSB EG011-01 (8/01) contains information related to this code
 

Trouble Code: P0301



Cylinder 1 Misfire Detected

Possible Causes:



Air leak in the intake manifold, or in the EGR or PCV system
 
Base engine mechanical fault that affects only one cylinder
 
Fuel delivery component fault that affects only one cylinder (e.g., a contaminated, dirty or sticking fuel injector)
 
Ignition system problem (coil or plug) that affects one cylinder
 

Trouble Code: P0302



Cylinder 2 Misfire Detected

Possible Causes:



Air leak in the intake manifold, or in the EGR or PCV system
 
Base engine mechanical fault that affects only one cylinder
 
Fuel delivery component fault that affects only one cylinder (e.g., a contaminated, dirty or sticking fuel injector)
 
Ignition system problem (coil or plug) that affects one cylinder
 

Trouble Code: P0303



Cylinder 3 Misfire Detected

Possible Causes:



Air leak in the intake manifold, or in the EGR or PCV system
 
Base engine mechanical fault that affects only one cylinder
 
Fuel delivery component fault that affects only one cylinder (e.g., a contaminated, dirty or sticking fuel injector)
 
Ignition system problem (coil or plug) that affects one cylinder
 

Trouble Code: P0304



Cylinder 4 Misfire Detected

Possible Causes:



Air leak in the intake manifold, or in the EGR or PCV system
 
Base engine mechanical fault that affects only one cylinder
 
Fuel delivery component fault that affects only one cylinder (e.g., a contaminated, dirty or sticking fuel injector)
 
Ignition system problem (coil or plug) that affects one cylinder
 

Trouble Code: P0325



Knock Sensor 1 Circuit Malfunction

Possible Causes:



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, not tightened properly or has failed
 
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: 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: P0341



Camshaft Position Sensor 'A' Signal Range/Performance

Possible Causes:



CMP sensor signal circuit is open, shorted to ground or power
 
CMP sensor pulley is damaged, or timing belt has jumped teeth
 
CMP sensor is damaged or has failed
 
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: 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
 

Trouble Code: P0500



Vehicle Speed Sensor Circuit Malfunction

Possible Causes:



VSS signal circuit is open, shorted to ground or to power (B+)
 
Combination Meter is damaged or has failed
 
PCM has failed
 
TSB EG004-02 (2/02) contains information related to this code
 

 
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