Mitsubishi Car 1999-05

3.0L V6 - Std 1

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3.0L V6 - Std

Trouble Code: P0101



Mass Airflow Sensor Range/Performance

Possible Causes:



Intake air leak between the MAF sensor and the throttle body
 
MAF sensor signal circuit is open or shorted to ground
 
MAF sensor is damaged or 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 damaged or has failed
 
PCM has failed
 

Trouble Code: P0106



Barometric Pressure Sensor Range/Performance

Possible Causes:



MAP sensor signal circuit to the PCM interrupted (intermittent)
 
MAP sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P0108



Manifold Air Pressure Sensor Circuit High Input

Possible Causes:



MAP sensor signal circuit is open between the sensor and PCM
 
MAP sensor signal circuit is shorted to VREF or system power
 
MAP sensor ground circuit is open between sensor and PCM
 
MAP sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P0111



Intake Air Temperature Sensor Range/Performance

Possible Causes:



IAT sensor signal circuit is open or shorted to ground
 
IAT sensor has failed
 
PCM has failed
 

Trouble Code: P0112



Intake Air Temperature Sensor Circuit Low Signal

Possible Causes:



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

Trouble Code: P0113



Intake Air Temperature Sensor Circuit High Signal

Possible Causes:



IAT sensor signal circuit is open between sensor and the PCM
 
IAT sensor signal circuit is shorted to VREF or system power
 
IAT sensor ground circuit is open between sensor and the PCM
 
IAT sensor is damaged or has failed (an internal short)
 
PCM has failed
 

Trouble Code: P0116



Engine Coolant Temperature Circuit Range/Performance Problem

Possible Causes:



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

Trouble Code: P0117



Engine Coolant Temperature Sensor Circuit Low Signal

Possible Causes:



ECT sensor signal circuit is shorted to ground
 
ECT sensor is damaged or has failed (it may be shorted)
 
PCM has failed
 

Trouble Code: P0118



Engine Coolant Temperature Sensor Circuit High Signal

Possible Causes:



ECT sensor signal circuit is open between sensor and the PCM
 
ECT sensor signal circuit is shorted to VREF or system power
 
ECT sensor ground circuit is open between sensor and PCM
 
ECT sensor is damaged or has failed (an internal short)
 
PCM has failed
 

Trouble Code: P0121



Throttle Position Sensor Circuit Range/Performance Problem

Possible Causes:



TP sensor signal circuit is open to the PCM (intermittent fault)
 
TP sensor ground circuit is open (an intermittent fault)
 
TP sensor is misadjusted
 
Throttle body is damaged or throttle linkage is bent or binding
 
TP sensor is damaged or has failed
 

Trouble Code: P0122



Throttle Position Sensor Circuit Low Input

Possible Causes:



TP sensor signal circuit is shorted to ground
 
TP sensor power circuit is open (check VREF from the PCM)
 
TP sensor has failed or is misadjusted
 
PCM has failed
 

Trouble Code: P0123



Throttle Position Sensor Circuit High Input

Possible Causes:



TP sensor signal circuit is shorted to ground
 
TP sensor power circuit is open (check VREF from the PCM)
 
TP sensor has failed or is misadjusted
 
PCM has failed
 

Trouble Code: P0125



Insufficient Coolant Temperature for Closed Loop Fuel Control

Possible Causes:



Check the operation of the thermostat (it may be stuck open)
 
ECT sensor circuit shorted or open
 
ECT sensor has failed
 
PCM failed
 

Trouble Code: P0128



Coolant Thermostat Malfunction

Possible Causes:



Check the operation of the thermostat (it may be stuck open)
 
ECT sensor is damaged
 
PCM has failed
 

Trouble Code: P0130



Heated Oxygen Sensor Circuit (Bank 1, Sensor 1)

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: P0131



Heated Oxygen Sensor Circuit Low Voltage (Sensor 1)

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: P0132



HO2S-11 (Bank 1 Sensor 1) Signal High Signal

Possible Causes:



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

Trouble Code: P0133



HO2S-11 (Bank 1 Sensor 1) Slow Response

Possible Causes:



Exhaust leak present in the exhaust manifold or exhaust pipes
 
HO2S element fuel contamination
 
HO2S element has deteriorated
 
PCM has failed
 

Trouble Code: P0134



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

Possible Causes:



Exhaust leak present in exhaust manifold or exhaust pipes
 
HO2S element fuel contamination or has deteriorated
 
HO2S signal circuit or the ground circuit has high resistance
 
HO2S heater element has failed, or the heater circuit is open
 
PCM has failed
 

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 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: P0137



HO2S-12 (Bank 1 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: P0138



HO2S-12 (Bank 1 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: P0139



HO2S-12 Circuit Slow Response (Bank 1 Sensor 2)

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: P0141



HO2S-12 (Bank 1 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: P0150



HO2S-21 (Bank 2 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: P0151



HO2S-21 (Bank 2 Sensor 1) Circuit Low Voltage

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: P0152



HO2S-21 (Bank 2 Sensor 1) Signal High Signal

Possible Causes:



HO2S signal circuit is open
 
HO2S signal circuit is shorted to the heater power circuit
 
HO2S is contaminated, damaged or it has failed
 
PCM has failed
 

Trouble Code: P0153



HO2S-21 (Bank 2 Sensor 1) Slow Response

Possible Causes:



Exhaust leak present in the exhaust manifold or exhaust pipes
 
HO2S element fuel contamination
 
HO2S element has deteriorated
 
PCM has failed
 

Trouble Code: P0154



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

Possible Causes:



Exhaust leak present in exhaust manifold or exhaust pipes
 
HO2S element fuel contamination or has deteriorated
 
HO2S signal circuit or the ground circuit has high resistance
 
HO2S heater element has failed, or the heater circuit is open
 
PCM has failed
 

Trouble Code: P0155



HO2S-21 (Bank 2 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: P0156



HO2S-22 (Bank 2 Sensor 2) 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: 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: 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: 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
 

 
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