Tracker 2000-2004

2.5L V6 VIN 4 Auto 1

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2.5L V6 VIN 4 Auto

Trouble Code: P0101



MAF Sensor Range/Performance

Possible Causes:



Base engine vacuum leak, PCV valve leaking or stuck open
 
Engine oil dipstick missing or not fully seated
 
MAF sensor element (wire) is contaminated or dirty
 
MAF sensor signal or ground circuit fault or sensor has failed
 
PCM has failed
 

Trouble Code: P0102



MAF Sensor Circuit Low Frequency

Possible Causes:



Base engine vacuum leak, PCV valve leaking or stuck open
 
Engine oil dipstick missing or not fully seated
 
MAF sensor element hot wire contaminated or the sensor failed
 
MAF sensor signal shorted to ground or ground circuit problem
 
MAF sensor wiring routed close to ignition wires or generator
 
PCM has failed
 

Trouble Code: P0103



MAF Sensor Circuit High Frequency

Possible Causes:



MAF sensor element hot wire is contaminated or dirty
 
MAF sensor is damaged or has failed
 
MAF sensor signal circuit is open between the sensor and PCM
 
MAF sensor wiring routed too close to the ignition wires
 
MAF sensor wiring routed to close to the back of the Generator
 
PCM has failed
 

Trouble Code: P0107



MAP Sensor Circuit Low Input

Possible Causes:



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

Trouble Code: P0108



MAP 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 is contaminated, out-of-calibration or has failed
 
PCM has failed
 

Trouble Code: P0112



Intake Air Temperature Sensor Circuit Low Input

Possible Causes:



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

Trouble Code: P0116



Engine Coolant Temperature Sensor Range/Performance

Possible Causes:



ECT sensor signal circuit is open or shorted to ground
 
ECT sensor is contaminated, out-of-calibration or has failed
 
PCM has failed
 

Trouble Code: P0117



Engine Coolant Temperature Sensor Circuit Low Input

Possible Causes:



ECT sensor connector is damaged or shorted
 
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 Input

Possible Causes:



ECT sensor connector is damaged, loose or open
 
ECT sensor signal circuit is open between sensor and the PCM
 
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 Range/Performance

Possible Causes:



MAP sensor may be out-of-calibration
 
TP sensor signal circuit is open to the PCM (intermittent fault)
 
TP sensor ground circuit is open (an intermittent fault)
 
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 is damaged or failed (it may be shorted internally)
 
PCM has failed
 

Trouble Code: P0123



Throttle Position Sensor Circuit High Input

Possible Causes:



TP sensor signal circuit is open between sensor and the PCM
 
TP sensor ground circuit is open between sensor and the PCM
 
TP sensor is damaged or has failed (it may be open internally)
 
PCM has failed
 

Trouble Code: P0125



ECT Excessive Time To Enter 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



ECT Below Thermostat Regulating Temperature

Possible Causes:



ECT sensor is out of calibration
 
Check for low coolant level or incorrect coolant mixture
 
Cooling system component failure (thermostat stuck open)
 

Trouble Code: P0131



HO2S-11 (Bank 1 Sensor 1) Circuit Low Input

Possible Causes:



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

Trouble Code: P0132



HO2S-11 (Bank 1 Sensor 1) Circuit High Input

Possible Causes:



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

Trouble Code: P0133



HO2S-11 (Bank 1 Sensor 1) Circuit Slow Response

Possible Causes:



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

Trouble Code: P0134



HO2S-11 (Bank 1 Sensor 1) Insufficient Activity Detected

Possible Causes:



Exhaust leak present in exhaust manifold or exhaust pipes
 
HO2S element is fuel contaminated or it 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, shorted to ground or power
 
HO2S heater power circuit is open (check power from IG fuse)
 
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) Circuit Low Input

Possible Causes:



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

Trouble Code: P0138



HO2S-12 (Bank 1 Sensor 2) Circuit 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: 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 IG fuse)
 
HO2S heater is damaged or has failed
 
PCM has failed
 

Trouble Code: P0151



Title: HO2S-21 (Bank 2 Sensor 1) Circuit Low Input

Possible Causes:



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

Trouble Code: P0152



HO2S-21 (Bank 2 Sensor 1) Circuit High Input

Possible Causes:



Exhaust leak present in the exhaust manifold or exhaust pipes
 
HO2S signal circuit shorted to power (check the heater circuit)
 
HO2S element is fuel contaminated or it has deteriorated
 
PCM has failed
 

Trouble Code: P0153



HO2S-21 (Bank 2 Sensor 1) Circuit 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-21 (Bank 2 Sensor 1) Insufficient Activity Detected

Possible Causes:



Exhaust leak present in exhaust manifold or exhaust pipes
 
HO2S element is fuel contaminated or it 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, shorted to ground or power
 
HO2S heater power circuit is open (check power from IG fuse)
 
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+)
 
PCM has failed
 

Trouble Code: P0157



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

Possible Causes:



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

Trouble Code: P0158



HO2S-22 (Bank 2 Sensor 2) Circuit 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: P0161



HO2S-22 (Bank 2 Sensor 2) Heater Circuit Malfunction

Possible Causes:



HO2S heater control circuit is open, shorted to ground or shorted to power
 
HO2S heater power circuit is open (check power from IG fuse)
 
HO2S heater is damaged or has failed
 
PCM has failed
 

Trouble Code: P0171



Fuel Trim 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
 
Exhaust leaks located in front of the 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: P0172



Fuel Trim 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 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 Trim System Lean (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 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: P0175



Fuel Trim 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 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: P0300



Multiple Engine Misfire Detected

Possible Causes:



Air leak in the intake manifold, or in the EGR or PCM system
 
Base engine mechanical fault affecting 2 or more cylinders
 
Erratic or interrupted CKP or CMP sensor signals
 
Fuel delivery component fault affecting 2 or more cylinders (i.e., a contaminated, dirty or sticking fuel injector)
 
Ignition system problem (coil or plug) affecting over 2 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 Cylinder 1
 
Fuel delivery component fault that affects only Cylinder 1 (i.e., a contaminated, dirty or sticking fuel injector)
 
Ignition system fault (coil or plug) that affects only Cylinder 1
 

 
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