Liberty, Wrangler, 1997-2005

2.8L L4 VIN 5 Std 2

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Trouble Code: P0128



Thermostat Rationality Test

Possible Causes:



Low coolant level
 
Thermostat has failed
 
Signal circuit shorted to battery voltage
 
ECT Sensor has failed or voltage is below 1.0v
 
Signal circuit is open, shorted to ground or shorted to Sensor ground
 
ECT Sensor ground circuit or signal circuit is open
 
PCM has failed
 

Trouble Code: P0129



Barometric Pressure Out-Of-Range

Possible Causes:



IAC motor control low or control high circuit has failed
 
MAP Sensor VREF (5v) circuit is open or shorted to ground
 
MAP Sensor signal circuit is open or shorted to ground
 
MAP Sensor is damaged or it has failed
 
May be an intermittent condition
 
PCM has failed
 

Trouble Code: P0131



O2 (B1 S1) Circuit Short to Ground

Possible Causes:



O2 signal circuit is shorted to chassis or Sensor ground
 
O2 return circuit is shorted to ground or to signal circuit
 
O2 signal circuit is shorted to O2 return upstream circuit
 
O2 may be contaminated or it has failed
 
PCM has failed
 

Trouble Code: P0132



O2 Sensor (B1 S1) Voltage High

Possible Causes:



O2 Sensor signal circuit and/or return circuit shorted to voltage
 
O2 Sensor has failed
 
O2 Sensor signal or return circuit open
 
PCM has failed
 

Trouble Code: P0133



O2 (B1 S1) Slow Response

Possible Causes:



Exhaust leak present in the exhaust manifold or exhaust pipes
 
O2 signal circuit or upstream circuit has failed
 
O2 element has failed
 

Trouble Code: P0135



O2 (B1 S1) Heater Circuit

Possible Causes:



O2 heater ground circuit open or O2 signal circuit is open
 
O2 heater element has failed
 
PCM has failed
 

Trouble Code: P0137



O2 (B1 S2) Sensor Circuit Low

Possible Causes:



O2 return circuit is shorted to ground
 
O2 signal circuit is shorted to ground, or to O2 return circuit, or O2 heater ground circuit
 
O2 Sensor has failed
 
PCM has failed
 

Trouble Code: P0138



O2 (B1 S2) Sensor Voltage High Condition:

Possible Causes:



O2 Sensor signal circuit or return circuit shorted to voltage
 
O2 Sensor has failed
 
O2 Sensor signal circuit or return circuit open
 
PCM has failed
 

Trouble Code: P0139



O2 (B1 S2) Slow Response

Possible Causes:



Exhaust leak
 
O2 element is contaminated, deteriorated or it has failed
 
O2 signal circuit or return circuit has failed
 

Trouble Code: P0141



O2 (B1 S2) Heater Circuit

Possible Causes:



O2 heater ground circuit open or O2 signal circuit is open
 
O2 heater element has failed
 
PCM has failed
 

Trouble Code: P0151



O2 (B2 S1) Circuit Short to Ground

Possible Causes:



O2 upstream circuit is shorted to ground
 
O2 signal circuit is shorted to ground or to O2 upstream return circuit
 
O2 signal circuit is shorted to the heater ground circuit
 
O2 may be contaminated or it has failed
 
PCM has failed
 

Trouble Code: P0152



O2 (B2 S1) Circuit High

Possible Causes:



O2 signal circuit is open or is shorted to battery voltage.
 
O2 upstream return circuit is open or is shorted to battery voltage
 
O2 Sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P0153



O2 (B2 S1) Slow Response

Possible Causes:



Exhaust leak
 
O2 signal circuit has an open or grounded condition
 
O2 upstream return circuit has an open or grounded condition
 
O2 element is deteriorated or it has failed
 

Trouble Code: P0155



O2 (B1 S1) Heater Circuit

Possible Causes:



O2 heater ground circuit open or O2 signal circuit is open
 
O2 heater element has failed
 
PCM has failed
 

Trouble Code: P0157



O2 (B2 S2) Circuit Low

Possible Causes:



O2 signal circuit is shorted to chassis or Sensor ground
 
O2 is damaged or it has failed
 
PCM has failed
 

Trouble Code: P0158



O2 (B2 S2) Circuit High

Possible Causes:



O2 signal circuit is open or is shorted to battery
 
O2 downstream return circuit is open or is shorted to battery
 
O2 is damaged or it has failed
 
PCM has failed
 

Trouble Code: P0159



O2 (B2 S2) Slow Response

Possible Causes:



Exhaust leak
 
O2 signal circuit is open or shorted
 
O2 downstream return circuit is open or shorted
 
O2 Sensor is damaged or has failed
 

Trouble Code: P0161



O2 (B1 S1) Heater Circuit

Possible Causes:



O2 heater ground circuit open or O2 signal circuit is open
 
O2 heater element or PCM has failed
 

Trouble Code: P0171



Fuel System Lean (B1 S1)

Possible Causes:



Restricted fuel supply line
 
Fuel pump inlet strainer plugged or fuel pump has failed
 
O2 Sensor has failed
 
O2 signal circuit or return circuit has failed
 
O2 Sensor heater operation is faulty
 
TP Sensor sweep has failed
 
MAP Sensor operation has failed
 
ECT Sensor operation has failed
 
Engine mechanical problem is present
 
Fuel is contaminated
 
Exhaust leak exists
 

Trouble Code: P0172



Fuel System (S1 B1) Rich

Possible Causes:



O2 Sensor heater or O2 Sensor has failed
 
EVAP purge solenoid failed or improper operation
 
O2 signal circuit or return circuit has failed
 
MAP Sensor has failed or circuit malfunction
 
ECT Sensor has failed or circuit malfunction
 
Engine mechanical problem
 
Fuel filter/pressure regulator has failed or needs repair
 
PCM has failed
 

Trouble Code: P0174



Fuel System (S2 B1) Lean

Possible Causes:



Restricted fuel supply line
 
Fuel pump inlet strainer plugged
 
Fuel pump is damaged or has failed
 
O2 signal circuit or return circuit has failed
 
MAP Sensor has failed or circuit malfunction
 
ECT Sensor has failed or circuit malfunction
 
Engine mechanical problem
 
Fuel filter/pressure regulator has failed or needs repair
 
O2 Sensor has failed
 
PCM has failed
 

Trouble Code: P0175



Fuel System (S2 B1) Rich

Possible Causes:



Restricted fuel supply line
 
Fuel pump inlet strainer plugged
 
Fuel pump is damaged or has failed
 
O2 signal circuit or return circuit has failed
 
MAP Sensor has failed or circuit malfunction
 
ECT Sensor has failed or circuit malfunction
 
Engine mechanical problem
 
Fuel filter/pressure regulator has failed or needs repair
 
O2 Sensor has failed
 
PCM has failed
 

Trouble Code: P0180



Fuel Temperature Sensor Signal Voltage Too Low Or Too High

Possible Causes:



Intermittent condition
 
Fuel Temp. Sensor signal circuit is open or is shorted to voltage (too high)
 
Fuel Temp. Sensor signal circuit is shorted to ground (too low)
 
Fuel Temp. Sensor signal and ground circuits are shorted together
 
Fuel Temp. Sensor has failed
 
ECM has failed
 

Trouble Code: P0190



Fuel Pressure Sensor Signal Voltage Too Low Or Too High

Possible Causes:



Fuel Pressure Sensor signal circuit is open or is shorted to voltage (too high)
 
Fuel Pressure Sensor signal circuit is shorted to ground (too low)
 
Fuel Pressure Sensor ground circuit is open (too high)
 
Fuel Pressure Sensor signal circuit is shorted to Sensor ground (too low)
 
Intermittent condition
 
Fuel Pressure Sensor 5v supply circuit is open (too high)
 
Fuel Pressure Sensor ground circuit is shorted to voltage (too high)
 
Fuel Pressure Sensor has failed
 
ECM has failed
 

Trouble Code: P0191



Fuel Pressure Sensor After-Run Negative Or Positive Plausibility

Possible Causes:



Fuel Pressure Sensor has failed
 
Intermittent condition
 

Trouble Code: P0196



Engine Oil Temperature Sensor Circuit Performance

Possible Causes:



Engine oil temp signal circuit is open or is shorted to ground or to battery voltage
 
Engine oil temp Sensor ground circuit is open
 
Engine oil temp signal circuit is shorted to Sensor ground
 
Engine oil temp Sensor has failed
 
PCM has failed
 

Trouble Code: P0197



Engine Oil Temperature Sensor Circuit Low

Possible Causes:



Engine oil temp signal circuit is shorted to ground
 
Engine oil temp signal circuit is shorted to Sensor ground
 
Engine oil temp Sensor has failed
 
PCM has failed
 

Trouble Code: P0198



Engine Oil Temperature Sensor Circuit High

Possible Causes:



Engine oil temp signal circuit is open or is shorted to battery voltage
 
Engine oil temp Sensor ground circuit is open
 
Engine oil temp Sensor has failed
 
PCM has failed
 

Trouble Code: P0201



Fuel Injector 1, 2, 3 or 4 Injector Circuit Load Drop Or Overcurrent High Side Or Low Side

Possible Causes:



ECM has failed
 
Intermittent condition
 
Fuel injector control circuit is open or is shorted to ground or to voltage
 
Fuel injector control circuits are shorted together
 
Fuel injector has failed
 

Trouble Code: P0202



Fuel Injector 1, 2, 3 or 4 Injector Circuit Load Drop Or Overcurrent High Side Or Low Side

Possible Causes:



ECM has failed
 
Intermittent condition
 
Fuel injector control circuit is open or is shorted to ground or to voltage
 
Fuel injector control circuits are shorted together
 
Fuel injector has failed
 

Trouble Code: P0203



Fuel Injector 1, 2, 3 or 4 Injector Circuit Load Drop Or Overcurrent High Side Or Low Side

Possible Causes:



ECM has failed
 
Intermittent condition
 
Fuel injector control circuit is open or is shorted to ground or to voltage
 
Fuel injector control circuits are shorted together
 
Fuel injector has failed
 

Trouble Code: P0204



Fuel Injector 1, 2, 3 or 4 Injector Circuit Load Drop Or Overcurrent High Side Or Low Side

Possible Causes:



ECM has failed
 
Intermittent condition
 
Fuel injector control circuit is open or is shorted to ground or to voltage
 
Fuel injector control circuits are shorted together
 
Fuel injector has failed
 

Trouble Code: P0205



Injector 1, 2, 3, 4, 5, or 6 Control

Possible Causes:



ASD relay output circuit failure
 
Fuel injector has malfunctioned or failed
 
Fuel injector control circuit is open or shorted to ground
 
PCM has failed
 

Trouble Code: P0206



Injector 1, 2, 3, 4, 5, or 6 Control

Possible Causes:



ASD relay output circuit failure
 
Fuel injector has malfunctioned or failed
 
Fuel injector control circuit is open or shorted to ground
 
PCM has failed
 

Trouble Code: P0218



A/T High Temperature Operation Activated

Possible Causes:



Engine cooling system malfunction present
 
High temperature operations activated
 
Transmission oil pump flow is too low or it is restricted
 

Trouble Code: P0221



Throttle Position Sensor No. 2 Performance

Possible Causes:



TP Sensor No. 1 or 2 signal circuit is shorted to battery voltage or to ground
 
TP Sensor No. 1 or 2 signal circuit has high resistance
 
5v supply circuit is shorted to ground
 
TP Sensor return circuit has high resistance
 
TP Sensor No. 1 signal circuit shorted to TP Sensor No. 2 signal circuit
 
TP Sensor or throttle body damaged or has failed
 
PCM has failed
 

Trouble Code: P0222



Throttle Position Sensor No. 2 Circuit Low

Possible Causes:



5v supply circuit is open or shorted to ground
 
TP Sensor No. 2 signal circuit shorted to ground or to Sensor return circuit
 
TP Sensor or throttle body damaged or has failed
 
Throttle plate jammed against the maximum stop
 
PCM has failed
 

Trouble Code: P0223



Throttle Position Sensor No. 2 Circuit High

Possible Causes:



TP Sensor No. 2 signal circuit shorted to battery voltage or to 5v supply circuit
 
TP Sensor return circuit is open
 
TP Sensor or throttle body is damaged or has failed
 
PCM has failed
 

Trouble Code: P0234



Turbo Boost Pressure Negative Deviation Performance

Possible Causes:



Air filter is clogged or malfunctioning
 
Air restrictions exist in intake or boost components
 
Air leaks exist in intake or boost components
 
Boost control vacuum supply is insufficient
 
Boost pressure actuator is malfunctioning or has failed
 
Turbocharger is malfunctioning or has failed
 

Trouble Code: P0235



Turbo Boost Pressure Sensor Plausibility

Possible Causes:



Intermittent condition
 
High resistance in Boost Pressure Sensor signal circuit, ground circuit or 5v supply circuit
 
Boost Pressure/Intake Air Temperature Sensor has failed
 
ECM has failed
 

 
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