Corolla 2006-2007

1.8L L4 VIN R Std 4

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Trouble Code: P0123



Throttle / Pedal Position Sensor / Switch "A" Circuit High Input

Possible Causes:



Open in VTA1 circuit
 
Open in E2 circuit
 
Short between VC and VTA1 circuits
 
ECM
 

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 for an incorrect coolant mixture
 

Trouble Code: P0125



Insufficient Coolant Temperature for Closed Loop Fuel Control

Possible Causes:



Cooling system
 
ECT sensor
 
Thermostat
 

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: P0128



Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)

Possible Causes:



Thermostat
 
Cooling system
 
ECT sensor
 
ECM
 

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 ground or to VREF
 
HO2S is damaged, contaminated or it 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

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: P0136



Oxygen Sensor Circuit Malfunction (Bank 1 Sensor 2)

Possible Causes:



Open or short in HO2 sensor (sensor 2) circuit
 
HO2 sensor (sensor 2)
 
HO2 sensor heater (sensor 2)
 
Air-Fuel Ratio (A/F) sensor (sensor 1)
 
EFI relay
 
Gas leakage from exhaust system
 

Trouble Code: P0137



Oxygen Sensor Circuit Low Voltage (Bank 1 Sensor 2)

Possible Causes:



Open in HO2 sensor (sensor 2) circuit
 
HO2 sensor (sensor 2)
 
HO2 sensor heater (sensor 2)
 
EFI relay
 
Gas leakage from exhaust system
 

Trouble Code: P0138



Oxygen Sensor Circuit High Voltage (Bank 1 Sensor 2)

Possible Causes:



Short in HO2 sensor (sensor 2) circuit
 
HO2 sensor (sensor 2)
 
ECM internal circuit malfunction
 

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 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: P0171



System Too Lean (Bank 1)

Possible Causes:



Air induction system
 
Injector blockage
 
Mass Air Flow (MAF) meter
 
Engine Coolant Temperature (ECT) sensor
 
Fuel pressure
 
Gas leakage from exhaust system
 
Open or short in A/F sensor (sensor 1) circuit
 
A/F sensor (sensor 1)
 
A/F sensor heater (sensor 1)
 
EFI relay
 
A/F sensor heater and EFI
 
relay circuits
 
PCV valve and hose
 
PCV hose connections
 
ECM
 
Injector leakage or
 
blockage
 
MAF meter
 
ECT sensor
 
Ignition system
 
Fuel pressure
 
Gas leakage from exhaust
 

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: P0172



System Too Rich (Bank 1)

Possible Causes:



system
 
Open or short in A/F sensor (sensor 1) circuit
 
A/F sensor (sensor 1)
 
A/F sensor heater (sensor 1)
 
EFI relay
 
A/F sensor heater and EFI relay circuits
 
ECM
 

Trouble Code: P0220



Throttle / Pedal Position Sensor / Switch "B" Circuit

Possible Causes:



Throttle position sensor (built into throttle body)
 
ECM
 

Trouble Code: P0222



Throttle / Pedal Position Sensor / Switch "B" Circuit Low Input

Possible Causes:



TP sensor (built into throttle body)
 
Short in VTA2 circuit
 
Open in VC circuit
 
ECM
 

Trouble Code: P0223



Throttle / Pedal Position Sensor / Switch "B" Circuit High Input

Possible Causes:



Throttle position sensor (built into throttle body)
 
Open in VTA2 circuit
 
Open in E2 circuit
 
Short between VC and VTA2 circuits
 
ECM
 

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: 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: P0325



Knock Sensor 1 Circuit

Possible Causes:



Open or short in knock sensor circuit
 
Knock sensor
 
ECM
 

Trouble Code: P0327



KNOCK SENSOR 1 CIRCUIT LOW INPUT (BANK 1 OR SINGLE SENSOR)

Possible Causes:



Short in knock sensor circuit
 
Knock sensor
 
ECM
 

Trouble Code: P0327



Knock Sensor 1 Circuit Low Input (Bank 1 or Single Sensor)

Possible Causes:



Short in knock sensor circuit
 
Knock sensor
 
ECM
 

Trouble Code: P0328



KNOCK SENSOR 1 CIRCUIT HIGH INPUT (BANK 1 OR SINGLE SENSOR)

Possible Causes:



Open in knock sensor circuit
 
Knock sensor
 
ECM
 

Trouble Code: P0328



Knock Sensor 1 Circuit High Input (Bank 1 or Single Sensor)

Possible Causes:



Open in knock sensor circuit
 
Knock sensor
 
ECM
 

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: P0335



Crankshaft Position Sensor "A" Circuit

Possible Causes:



Open or short in CKP sensor circuit
 
CKP sensor
 
Sensor plate (CKP sensor plate)
 
ECM
 

Trouble Code: P0339



Crankshaft Position Sensor "A" Circuit Intermittent

Possible Causes:



Open or short in CKP sensor circuit
 
CKP sensor
 
Sensor plate (CKP sensor plate)
 
ECM
 

Trouble Code: P0340



Camshaft Position Sensor Circuit Malfunction

Possible Causes:



CMP sensor signal circuit is open, shorted to ground or power
 
CMP sensor signal ground circuit is open
 
CMP sensor has failed, or the PCM has failed
 

Trouble Code: P0340



Camshaft Position Sensor "A" Circuit (Bank 1 or Single Sensor)

Possible Causes:



Open or short in CMP sensor circuit
 
CMP sensor
 
Camshaft
 
Jumped tooth of timing chain
 
ECM
 

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: P0341



Camshaft Position Sensor "A" Circuit Range / Performance (Bank 1 or Single Sensor)

Possible Causes:



Open or short in CMP sensor circuit
 
CMP sensor
 
Camshaft
 
Jumped tooth of timing chain
 
ECM
 

Trouble Code: P0351



Ignition Coil "A" Primary / Secondary Circuit

Possible Causes:



Ignition system
 
Open or short in IGF or IGT circuit (1 to 4) between ignition coil with igniter and ECM
 
No. 1 to No. 4 ignition coils with igniters
 
ECM
 

Trouble Code: P0351



Ignition Coil "A" Primary / Secondary Circuit

Possible Causes:



Ignition system
 
Open or short in IGF1 or IGT1 circuit between ignition coil and ECM
 
No. 1 ignition coil
 
ECM
 

 
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