Mitsubishi Car 1999-05

3.0L V6 VIN H Std 2

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Trouble Code: P0157



HO2S-22 (Bank 2 Sensor 2) Signal Low Input

Possible Causes:



HO2S signal circuit is open
 
HO2S signal circuit is shorted to ground
 
HO2S is damaged or it has failed
 
PCM has failed
 

Trouble Code: P0158



HO2S-22 (Bank 2 Sensor 2) Signal High Input

Possible Causes:



HO2S signal circuit shorted to power (check the heater circuit)
 
HO2S is damaged or it has failed
 
PCM has failed
 

Trouble Code: P0159



HO2S-22 (Bank 2 Sensor 2) No Activity Detected

Possible Causes:



HO2S signal circuit is open or it has high resistance
 
HO2S element fuel contamination or has deteriorated
 
HO2S is damaged or has failed
 
PCM has failed
 

Trouble Code: P0161



HO2S-12 (Bank 2 Sensor 2) 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: P0170



Fuel Trim Fault (Bank 1)

Possible Causes:



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
 
HO2S is contaminated, deteriorated or it has failed
 
Vehicle driven low on fuel or until it ran out of fuel
 

Trouble Code: P0171



Fuel System Lean (Bank 1)

Possible Causes:



Air leaks after the MAF sensor, or in the EGR or PCV system
 
Base engine "mechanical" fault affecting one or more cylinders
 
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
 
HO2S is contaminated, deteriorated or it has failed
 
Vehicle driven low on fuel or until it ran out of fuel
 

Trouble Code: P0172



Fuel System Rich (Bank 1)

Possible Causes:



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)
 
HO2S is contaminated, deteriorated or it has failed
 

Trouble Code: P0173



Fuel Trim Fault (Bank 2)

Possible Causes:



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
 
HO2S is contaminated, deteriorated or it has failed
 
Vehicle driven low on fuel or until it ran out of fuel
 

Trouble Code: P0174



Fuel System Lean (Bank 2)

Possible Causes:



Air leaks after the MAF sensor, or in the EGR or PCV system
 
Base engine "mechanical" fault affecting one or more cylinders
 
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
 
HO2S is contaminated, deteriorated or it has failed
 
Vehicle driven low on fuel or until it ran out of fuel
 

Trouble Code: P0175



Fuel System Rich (Bank 2)

Possible Causes:



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)
 
HO2S is contaminated, deteriorated or it has failed
 

Trouble Code: P0181



Fuel Temperature Sensor Range/Performance

Possible Causes:



Fuel temperature sensor signal circuit is open (intermittent)
 
Fuel temperature sensor signal circuit is shorted to ground
 
Fuel temperature sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P0182



Fuel Temperature Sensor Circuit Low Input

Possible Causes:



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

Trouble Code: P0183



Fuel Temperature Sensor Circuit High Input

Possible Causes:



Fuel temperature sensor signal circuit is open
 
Fuel temperature sensor signal circuit shorted to system power
 
Fuel temperature sensor ground circuit is open
 
Fuel temperature sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P0201



Fuel Injector 1 Circuit Malfunction

Possible Causes:



Injector control circuit is open or shorted to ground
 
Injector power circuit is open (check power from the MFI relay)
 
Fuel injector is damaged or has failed
 

Trouble Code: P0202



Fuel Injector 2 Circuit Malfunction

Possible Causes:



Injector control circuit is open or shorted to ground
 
Injector power circuit is open (check power from the MFI relay)
 
Fuel injector is damaged or has failed
 

Trouble Code: P0203



Fuel Injector 3 Circuit Malfunction

Possible Causes:



Injector control circuit is open or shorted to ground
 
Injector power circuit is open (check power from the MFI relay)
 
Fuel injector is damaged or has failed
 

Trouble Code: P0204



Fuel Injector 4 Circuit Malfunction

Possible Causes:



Injector control circuit is open or shorted to ground
 
Injector power circuit is open (check power from the MFI relay)
 
Fuel injector is damaged or has failed
 

Trouble Code: P0205



Fuel Injector 5 Circuit Malfunction

Possible Causes:



Injector control circuit is open or shorted to ground
 
Injector power circuit is open (check power from the MFI relay)
 
Fuel injector is damaged or has failed
 

Trouble Code: P0206



Fuel Injector 6 Circuit Malfunction

Possible Causes:



Injector control circuit is open or shorted to ground
 
Injector power circuit is open (check power from the MFI relay)
 
Fuel injector is damaged or has failed
 

Trouble Code: P0300



Random Misfire Detected

Possible Causes:



Air leak in the intake manifold, or in the EGR or PCM 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 (i.e., a contaminated, dirty or sticking fuel injector)
 
Ignition system problem (coil or plug) in one or more cylinders
 

Trouble Code: P0301



Cylinder 1 Misfire Detected

Possible Causes:



Air leak in the intake manifold, or in the EGR or PCM system
 
Base engine mechanical fault that affects only one cylinder
 
Fuel delivery component fault that affects only one cylinder (i.e., a contaminated, dirty or sticking fuel injector)
 
Ignition system problem (coil or plug) that affects one cylinder
 
TSB 00-11-006 (7/00) has information about this code (V6 only)
 

Trouble Code: P0302



Cylinder 2 Misfire Detected

Possible Causes:



Air leak in the intake manifold, or in the EGR or PCM system
 
Base engine mechanical fault that affects only one cylinder
 
Fuel delivery component fault that affects only one cylinder (i.e., 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 PCM system
 
Base engine mechanical fault that affects only one cylinder
 
Fuel delivery component fault that affects only one cylinder (i.e., a contaminated, dirty or sticking fuel injector)
 
Ignition system problem (coil or plug) that affects one cylinder
 
TSB 00-11-006 (7/00) has information about this code (V6 only)
 

Trouble Code: P0304



Cylinder 4 Misfire Detected

Possible Causes:



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

Trouble Code: P0305



Cylinder 5 Misfire Detected

Possible Causes:



Air leak in the intake manifold, or in the EGR or PCM system
 
Base engine mechanical fault that affects only one cylinder
 
Fuel delivery component fault that affects only one cylinder (i.e., a contaminated, dirty or sticking fuel injector)
 
Ignition system problem (coil or plug) that affects one cylinder
 
TSB 00-11-006 (7/00) has information about this code (V6 only)
 

Trouble Code: P0306



Cylinder 6 Misfire Detected

Possible Causes:



Air leak in the intake manifold, or in the EGR or PCM system
 
Base engine mechanical fault that affects only one cylinder
 
Fuel delivery component fault that affects only one cylinder (i.e., 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 or has failed
 
Verify the Knock Sensor (KS) is tightened its specification
 
PCM has failed
 

Trouble Code: P0335



Crankshaft Position Sensor Circuit Malfunction

Possible Causes:



CKP sensor signal circuit is open or shorted to ground
 
CKP sensor ground circuit is open
 
CKP sensor power circuit is open (check power to MFI relay)
 
CKP sensor is damaged or has failed
 
PCM has failed (the PCM provides the 5v VREF to the sensor)
 

Trouble Code: P0340



Camshaft Position Sensor Circuit Malfunction

Possible Causes:



CMP sensor signal circuit is open or shorted to ground
 
CMP sensor ground circuit is open
 
CMP sensor power circuit is open (check power to MFI relay)
 
CMP sensor is damaged or has failed
 
PCM has failed (the PCM provides the 5v VREF to the sensor)
 

Trouble Code: P0400



Exhaust Gas Recirculation System Flow Malfunction

Possible Causes:



EGR valve source vacuum supply line is open or restricted
 
EGR exhaust tube is clogged or restricted
 
EGR valve assembly is damaged or has failed
 
PCM has failed
 

Trouble Code: P0401



Insufficient EGR Flow Detected

Possible Causes:



EGR solenoid control circuit is open or shorted to ground
 
EGR vacuum hose to source vacuum is loose or disconnected
 
EGR exhaust tube is clogged or restricted
 
EGR valve assembly is damaged or has failed
 
PCM has failed
 

Trouble Code: P0403



EGR Control Circuit Malfunction

Possible Causes:



EGR solenoid control circuit is open or shorted to ground
 
EGR solenoid power circuit is open (check power from relay)
 
EGR solenoid is damaged or has failed
 
PCM has failed
 

Trouble Code: P0421



Warmup Catalyst Efficiency Low (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 and/or the rear HO2S is loose in the mounting hole
 
Front HO2S older (aged) than the rear HO2S (HO2S is lazy)
 

Trouble Code: P0431



Warmup Catalyst Efficiency Low (Bank 2)

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 and/or the rear HO2S is loose in the mounting hole
 
Front HO2S older (aged) than the rear HO2S (HO2S is lazy)
 

Trouble Code: P0441



EVAP Emission Control System Incorrect Purge Flow

Possible Causes:



Charcoal canister is damaged, clogged or restricted
 
Purge solenoid circuit is open (fault may be intermittent)
 
Purge solenoid power circuit is open (check the relay or fuse)
 
Purge valve vacuum line is clogged, restricted or disconnected
 
PCM has failed
 

Trouble Code: P0442



EVAP Control System Small Leak Detected

Possible Causes:



Canister Purge valve is damaged, leaking or it 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: P0443



EVAP Purge Control Solenoid Circuit Malfunction

Possible Causes:



Purge solenoid circuit control is open or shorted to ground
 
Purge solenoid power circuit is open (test from the relay)
 
Purge control solenoid is damaged or has failed
 
PCM has failed
 

Trouble Code: P0446



EVAP Vent Control Solenoid Circuit Malfunction

Possible Causes:



Vent Control solenoid circuit is open or shorted to ground
 
Vent Control solenoid power circuit is open (test from the relay)
 
Vent Control solenoid is damaged or has failed
 
PCM has failed
 

Trouble Code: P0450



Fuel Tank Pressure Sensor Circuit Malfunction

Possible Causes:



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

Trouble Code: P0451



Fuel Tank Pressure Sensor Range/Performance

Possible Causes:



Fuel tank pressure sensor vacuum hoses loose or damaged
 
Fuel tank pressure sensor is damaged or out-of-calibration
 
PCM has failed
 

 
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