Toyota Tacoma 2002-06

4.0L V6 - Auto 1

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4.0L V6 - 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: P0101



Mass Airflow Sensor Signal Range/Performance

Possible Causes:



MAF sensor signal circuit is open, shorted to ground or power
 
MAF sensor is contaminated, damaged or it has failed
 
PCM has failed
 

Trouble Code: P0102



Mass Airflow Sensor Circuit Low Input

Possible Causes:



MAF sensor signal circuit is open or shorted to ground
 
MAF sensor is contaminated, damaged or it has failed
 
PCM has failed
 

Trouble Code: P0103



Mass Airflow Sensor Circuit High Input

Possible Causes:



MAF sensor signal circuit is shorted to power
 
MAF sensor is contaminated, damaged or it has failed
 
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: P0112



Intake Air Temperature Sensor Circuit Low Input

Possible Causes:



IAT sensor connector is damaged (it may be shorted internally)
 
IAT sensor ground circuit is shorted to ground
 
IAT sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P0113



Intake Air Temperature Sensor Circuit High Input

Possible Causes:



IAT sensor connector is damaged (it may be open internally)
 
IAT sensor ground circuit is open
 
IAT sensor is 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 problems in the cooling system (i.e., coolant, the fan)
 
ECT sensor signal circuit or ground circuit has high resistance
 
ECT sensor is contaminated, damaged or has failed
 
PCM has failed
 

Trouble Code: P0117



Engine Coolant Temperature Sensor Circuit Low Input

Possible Causes:



ECT sensor signal circuit is shorted to ground
 
ECT sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P0120



Throttle Pedal Position Sensor/Switch 'A' Circuit Malfunction Conditions

Possible Causes:



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

Trouble Code: P0121



Throttle Pedal Position Sensor Switch 'A' Signal Range/Performance

Possible Causes:



TP sensor connector is damaged or it is open
 
TP sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P0122



Throttle Pedal Position Sensor/Switch 'A' Circuit Low Input

Possible Causes:



Throttle control motor and sensor unit is damaged or failed
 
TP sensor VC (VREF) circuit is open, or the VTA1 signal circuit is shorted to ground
 
PCM has failed
 

Trouble Code: P0123



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

Possible Causes:



Throttle control motor and sensor unit is damaged or failed
 
TP sensor VC (VREF) circuit is shorted to the VTA1 circuit
 
VTA1 ground circuit is open or the VTA1 signal circuit is open
 
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 for 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: P0134



HO2S-11 (Bank 1 Sensor 1) Circuit No Activity Detected

Possible Causes:



Air leaks present in the PCV valve, hoses or hose connections
 
Fuel Control component faults (sticking injector, low pressure)
 
Gas leaks in the exhaust system in front of the Oxygen sensor
 
HO2S connector is damaged or loose
 
HO2S signal circuit is open or shorted to ground
 
HO2S is damaged, contaminated or it 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: 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: 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: 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: 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, shorted to ground or power
 
CMP sensor signal ground circuit is open
 
CMP sensor has failed, or the PCM has failed
 

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: 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: P0420



Catalyst Efficiency Below Normal (Bank 1)

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
 

 
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