Liberty, Wrangler 2006-2007

2.4L L4 VIN 1 Std 2

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Trouble Code: P0159



O2 SENSOR 2/2 SLOW RESPONSE

Possible Causes:



GOOD TRIP EQUAL TO ZERO
 
EXHAUST LEAK
 
O2 SIGNAL CIRCUIT
 
O2 RETURN CIRCUIT
 
O2 SENSOR
 

Trouble Code: P0161



O2 SENSOR 2/2 HEATER PERFORMANCE

Possible Causes:



O2 SENSOR HEATER OPERATION
 
O2 HEATER ELEMENT
 
O2 HEATER CONTROL CIRCUIT OPEN
 
O2 HEATER GROUND CIRCUIT OPEN
 
PCM
 

Trouble Code: P0171



FUEL SYSTEM 1/1 LEAN

Possible Causes:



GOOD TRIP EQUAL TO ZERO
 
RESTRICTED FUEL SUPPLY LINE
 
FUEL PUMP INLET STRAINER PLUGGED
 
FUEL PUMP MODULE
 
O2 SENSOR
 
O2 SIGNAL CIRCUIT
 
O2 RETURN CIRCUIT
 
O2 SENSOR HEATER OPERATION
 
THROTTLE POSITION SENSOR VOLTAGE GREATER THAN 0.92 VOLTS WITH THROTTLE
 
CLOSED
 
THROTTLE POSITION SENSOR SWEEP
 
MAP SENSOR
 
ECT SENSOR
 
ENGINE MECHANICAL PROBLEM
 
FUEL FILTER/PRESSURE REGULATOR (HIGH)
 
PCM
 

Trouble Code: P0172



FUEL SYSTEM 1/1 RICH

Possible Causes:



GOOD TRIP EQUAL TO ZERO
 
O2 SENSOR HEATER OPERATION
 
O2 SENSOR
 
O2 SIGNAL CIRCUIT
 
O2 RETURN CIRCUIT
 
THROTTLE POSITION SENSOR VOLTAGE GREATER THAN 0.92 VOLTS WITH THROTTLE
 
CLOSED
 
THROTTLE POSITION SENSOR SWEEP
 
MAP SENSOR
 
ECT SENSOR
 
EVAP PURGE SOLENOID OPERATION
 
ENGINE MECHANICAL PROBLEM
 
FUEL FILTER/PRESSURE REGULATOR (HIGH)
 
PCM
 

Trouble Code: P0174



FUEL SYSTEM 2/1 LEAN

Possible Causes:



GOOD TRIP EQUAL TO ZERO
 
RESTRICTED FUEL SUPPLY LINE
 
FUEL PUMP INLET STRAINER PLUGGED
 
FUEL PUMP MODULE
 
O2 SENSOR
 
O2 SIGNAL CIRCUIT
 
O2 RETURN CIRCUIT
 
O2 SENSOR HEATER OPERATION
 
THROTTLE POSITION SENSOR VOLTAGE GREATER THAN 0.92 VOLTS WITH THROTTLE
 
CLOSED
 
THROTTLE POSITION SENSOR SWEEP
 
MAP SENSOR
 
ECT SENSOR
 
ENGINE MECHANICAL PROBLEM
 
FUEL FILTER/PRESSURE REGULATOR (HIGH)
 
PCM
 

Trouble Code: P0175



FUEL SYSTEM 2/1 RICH

Possible Causes:



GOOD TRIP EQUAL TO ZERO
 
O2 SENSOR HEATER OPERATION
 
O2 SENSOR
 
O2 SIGNAL CIRCUIT
 
O2 RETURN CIRCUIT
 
THROTTLE POSITION SENSOR VOLTAGE GREATER THAN 0.92 VOLTS WITH THROTTLE
 
CLOSED
 
THROTTLE POSITION SENSOR SWEEP
 
MAP SENSOR
 
ECT SENSOR
 
EVAP PURGE SOLENOID OPERATION
 
ENGINE MECHANICAL PROBLEM
 
FUEL FILTER/PRESSURE REGULATOR (HIGH)
 
PCM
 

Trouble Code: P0201



FUEL INJECTOR NO.1 CIRCUIT

Possible Causes:



GOOD TRIP EQUAL TO ZERO
 
(F142), (K334) ASD RELAY OUTPUT CIRCUIT
 
FUEL INJECTOR
 
INJECTOR CONTROL CIRCUIT OPEN
 
INJECTOR CONTROL CIRCUIT SHORTED TO GROUND
 
PCM
 

Trouble Code: P0202



FUEL INJECTOR NO.2 CIRCUIT

Possible Causes:



GOOD TRIP EQUAL TO ZERO
 
(F142), (K334) ASD RELAY OUTPUT CIRCUIT
 
FUEL INJECTOR
 
INJECTOR CONTROL CIRCUIT OPEN
 
INJECTOR CONTROL CIRCUIT SHORTED TO GROUND
 
PCM
 

Trouble Code: P0203



FUEL INJECTOR NO.3 CIRCUIT

Possible Causes:



GOOD TRIP EQUAL TO ZERO
 
(F142), (K334) ASD RELAY OUTPUT CIRCUIT
 
FUEL INJECTOR
 
INJECTOR CONTROL CIRCUIT OPEN
 
INJECTOR CONTROL CIRCUIT SHORTED TO GROUND
 
PCM
 

Trouble Code: P0204



FUEL INJECTOR NO.4 CIRCUIT

Possible Causes:



GOOD TRIP EQUAL TO ZERO
 
(F142), (K334) ASD RELAY OUTPUT CIRCUIT
 
FUEL INJECTOR
 
INJECTOR CONTROL CIRCUIT OPEN
 
INJECTOR CONTROL CIRCUIT SHORTED TO GROUND
 
PCM
 

Trouble Code: P0205



FUEL INJECTOR NO.5 CIRCUIT

Possible Causes:



GOOD TRIP EQUAL TO ZERO
 
(F142), (K334) ASD RELAY OUTPUT CIRCUIT
 
FUEL INJECTOR
 
INJECTOR CONTROL CIRCUIT OPEN
 
INJECTOR CONTROL CIRCUIT SHORTED TO GROUND
 
PCM
 

Trouble Code: P0206



FUEL INJECTOR NO.6 CIRCUIT

Possible Causes:



GOOD TRIP EQUAL TO ZERO
 
(F142), (K334) ASD RELAY OUTPUT CIRCUIT
 
FUEL INJECTOR
 
INJECTOR CONTROL CIRCUIT OPEN
 
INJECTOR CONTROL CIRCUIT SHORTED TO GROUND
 
PCM
 

Trouble Code: P0218



HIGH TEMPERATURE OPERATION ACTIVATED

Possible Causes:



ENGINE COOLING SYSTEM MALFUNCTION
 
TRANSMISSION OIL COOLER PLUGGED
 
HIGH TEMPERATURE OPERATIONS ACTIVATED
 

Trouble Code: P0300



MULTIPLE CYLINDER MISFIRE

Possible Causes:



INTERMITTENT MISFIRE
 
VISUAL INSPECTION
 
(F142), (K334) ASD RELAY OUPUT CIRCUIT
 
ENGINE MECHANICAL PROBLEM
 
IGNITION COIL
 
COIL CONTROL CIRCUIT
 
SPARK PLUG
 
CHECKING FUEL PRESSURE
 
FUEL PUMP INLET STRAINER PLUGGED
 
RESTRICTED FUEL SUPPLY LINE
 
FUEL PUMP MODULE
 
CHECKING FUEL LEAK DOWN
 
FUEL INJECTOR
 
INJECTOR CONTROL CIRCUIT
 
PCM
 

Trouble Code: P0301



CYLINDER NO.1 MISFIRE

Possible Causes:



INTERMITTENT MISFIRE
 
VISUAL INSPECTION
 
(F142), (K334) ASD RELAY OUPUT CIRCUIT
 
ENGINE MECHANICAL PROBLEM
 
IGNITION COIL
 
COIL CONTROL CIRCUIT
 
SPARK PLUG
 
CHECKING FUEL PRESSURE
 
FUEL PUMP INLET STRAINER PLUGGED
 
RESTRICTED FUEL SUPPLY LINE
 
FUEL PUMP MODULE
 
CHECKING FUEL LEAK DOWN
 
FUEL INJECTOR
 
INJECTOR CONTROL CIRCUIT
 
PCM
 

Trouble Code: P0302



CYLINDER NO.2 MISFIRE

Possible Causes:



INTERMITTENT MISFIRE
 
VISUAL INSPECTION
 
(F142), (K334) ASD RELAY OUPUT CIRCUIT
 
ENGINE MECHANICAL PROBLEM
 
IGNITION COIL
 
COIL CONTROL CIRCUIT
 
SPARK PLUG
 
CHECKING FUEL PRESSURE
 
FUEL PUMP INLET STRAINER PLUGGED
 
RESTRICTED FUEL SUPPLY LINE
 
FUEL PUMP MODULE
 
CHECKING FUEL LEAK DOWN
 
FUEL INJECTOR
 
INJECTOR CONTROL CIRCUIT
 
PCM
 

Trouble Code: P0303



CYLINDER NO.3 MISFIRE

Possible Causes:



INTERMITTENT MISFIRE
 
VISUAL INSPECTION
 
(F142), (K334) ASD RELAY OUPUT CIRCUIT
 
ENGINE MECHANICAL PROBLEM
 
IGNITION COIL
 
COIL CONTROL CIRCUIT
 
SPARK PLUG
 
CHECKING FUEL PRESSURE
 
FUEL PUMP INLET STRAINER PLUGGED
 
RESTRICTED FUEL SUPPLY LINE
 
FUEL PUMP MODULE
 
CHECKING FUEL LEAK DOWN
 
FUEL INJECTOR
 
INJECTOR CONTROL CIRCUIT
 
PCM
 

Trouble Code: P0304



CYLINDER NO.4 MISFIRE

Possible Causes:



INTERMITTENT MISFIRE
 
VISUAL INSPECTION
 
(F142), (K334) ASD RELAY OUPUT CIRCUIT
 
ENGINE MECHANICAL PROBLEM
 
IGNITION COIL
 
COIL CONTROL CIRCUIT
 
SPARK PLUG
 
CHECKING FUEL PRESSURE
 
FUEL PUMP INLET STRAINER PLUGGED
 
RESTRICTED FUEL SUPPLY LINE
 
FUEL PUMP MODULE
 
CHECKING FUEL LEAK DOWN
 
FUEL INJECTOR
 
INJECTOR CONTROL CIRCUIT
 
PCM
 

Trouble Code: P0305



CYLINDER NO.5 MISFIRE

Possible Causes:



INTERMITTENT MISFIRE
 
VISUAL INSPECTION
 
(F142), (K334) ASD RELAY OUPUT CIRCUIT
 
ENGINE MECHANICAL PROBLEM
 
IGNITION COIL
 
COIL CONTROL CIRCUIT
 
SPARK PLUG
 
CHECKING FUEL PRESSURE
 
FUEL PUMP INLET STRAINER PLUGGED
 
RESTRICTED FUEL SUPPLY LINE
 
FUEL PUMP MODULE
 
CHECKING FUEL LEAK DOWN
 
FUEL INJECTOR
 
INJECTOR CONTROL CIRCUIT
 
PCM
 

Trouble Code: P0306



CYLINDER NO.6 MISFIRE

Possible Causes:



INTERMITTENT MISFIRE
 
VISUAL INSPECTION
 
(F142), (K334) ASD RELAY OUPUT CIRCUIT
 
ENGINE MECHANICAL PROBLEM
 
IGNITION COIL
 
COIL CONTROL CIRCUIT
 
SPARK PLUG
 
CHECKING FUEL PRESSURE
 
FUEL PUMP INLET STRAINER PLUGGED
 
RESTRICTED FUEL SUPPLY LINE
 
FUEL PUMP MODULE
 
CHECKING FUEL LEAK DOWN
 
FUEL INJECTOR
 
INJECTOR CONTROL CIRCUIT
 
PCM
 

Trouble Code: P0315



NO CRANK SENSOR LEARNED

Possible Causes:



INTERMITTENT CONDITION
 
TONE WHEEL/PULSE RING INSPECTION
 
CKP WIRE HARNESS INSPECTION
 
CRANKSHAFT POSITION SENSOR
 

Trouble Code: P0325



KNOCK SENSOR NO.1 CIRCUIT

Possible Causes:



GOOD TRIP EQUAL TO ZERO
 
KNOCK SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE
 
KNOCK SENSOR SIGNAL CIRCUIT OPEN
 
KNOCK SENSOR RETURN CIRCUIT OPEN
 
KNOCK SENSOR SIGNAL CIRCUIT SHORTED TO GROUND
 
KNOCK SENSOR SIGNAL CIRCUIT SHORTED TO KNOCK SENSOR RETURN CIRCUIT
 
KNOCK SENSOR
 

Trouble Code: P0330



KNOCK SENSOR NO.2 CIRCUIT

Possible Causes:



GOOD TRIP EQUAL TO ZERO
 
KNOCK SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE
 
KNOCK SENSOR SIGNAL CIRCUIT OPEN
 
KNOCK SENSOR RETURN CIRCUIT OPEN
 
KNOCK SENSOR SIGNAL CIRCUIT SHORTED TO GROUND
 
KNOCK SENSOR SIGNAL CIRCUIT SHORTED TO KNOCK SENSOR RETURN CIRCUIT
 
KNOCK SENSOR
 

Trouble Code: P0335



CRANKSHAFT POSITION SENSOR CIRCUIT

Possible Causes:



INTERMITTENT CKP SIGNAL
 
INTERMITTENT CMP SIGNAL
 
(F855) 5-VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE
 
(F855) 5-VOLT SUPPLY CIRCUIT OPEN
 
(F855) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND
 
(K24) CKP SIGNAL CIRCUIT OPEN
 
(K24) CKP SIGNAL CIRCUIT SHORTED TO VOLTAGE
 
(K24) CKP SIGNAL CIRCUIT SHORTED GROUND
 
(K24) CKP SIGNAL CIRCUIT SHORTED TO (F855) 5-VOLT SUPPLY CIRCUIT
 
(K900) SENSOR GROUND CIRCUIT OPEN
 
CRANKSHAFT POSITION SENSOR
 
PCM
 

Trouble Code: P0339



CRANKSHAFT POSITION SENSOR INTERMITTENT

Possible Causes:



GOOD TRIP EQUAL TO ZERO
 
CKP WIRE HARNESS INSPECTION
 
(F855) 5-VOLT SUPPLY CIRCUIT OPEN OR SHORTED TO GROUND
 
TONE WHEEL/PULSE RING INSPECTION
 
CHECKING CMP SENSOR SIGNAL WITH THE DRBIII- LAB SCOPE
 
CRANKSHAFT POSITION SENSOR
 
(K24) CKP SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE
 
(K24) CKP SIGNAL CIRCUIT OPEN
 
(K24) CKP SIGNAL CIRCUIT SHORTED TO GROUND
 
(K24) CKP SIGNAL CIRCUIT SHORTED TO (F855) 5-VOLT SUPPLY CIRCUIT
 
PCM
 

Trouble Code: P0340



CAMSHAFT POSITION SENSOR CIRCUIT

Possible Causes:



INTERMITTENT CMP SIGNAL
 
INTERMITTENT CKP SIGNAL
 
(F856) 5-VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE
 
(F856) 5-VOLT SUPPLY CIRCUIT OPEN
 
(F856) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND
 
(K44) CMP SIGNAL CIRCUIT SHORTED TO VOLTAGE
 
(K44) CMP SIGNAL CIRCUIT OPEN
 
(K44) CMP SIGNAL CIRCUIT SHORTED TO GROUND
 
(K44) CMP SIGNAL SHORTED TO THE (F856) 5-VOLT SUPPLY CIRCUIT
 
(K900) SENSOR GROUND CIRCUIT OPEN
 
CAMSHAFT POSITION SENSOR
 
PCM
 

Trouble Code: P0344



CAMSHAFT POSITION SENSOR INTERMITTENT

Possible Causes:



GOOD TRIP EQUAL TO ZERO
 
CMP WIRE HARNESS INSPECTION
 
(F856) 5-VOLT SUPPLY CIRCUIT OPEN OR SHORTED TO GROUND
 
TONE WHEEL/PULSE RING INSPECTION
 
CHECKING CKP SENSOR SIGNAL WITH THE DRBIII- LAB SCOPE
 
CAMSHAFT POSITION SENSOR
 
(K44) CMP SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE
 
(K44) CMP SIGNAL CIRCUIT OPEN
 
(K44) CMP SIGNAL CIRCUIT SHORTED TO GROUND
 
(K44) CMP SIGNAL CIRCUIT SHORTED TO THE (F856) 5-VOLT SUPPLY CIRCUIT
 
PCM
 

Trouble Code: P0420



CATALYST 1/1 EFFICIENCY

Possible Causes:



GOOD TRIP EQUAL TO ZERO
 
VISUALLY INSPECT CATALYTIC CONVERTER
 
EXHAUST LEAK
 
ENGINE MECHANICAL CONDITION
 
AGING O2 SENSOR
 
CATALYTIC CONVERTER
 

Trouble Code: P0421



CATALYST 1/1 EFFICIENCY

Possible Causes:



GOOD TRIP EQUAL TO ZERO
 
VISUALLY INSPECT CATALYTIC CONVERTER
 
EXHAUST LEAK
 
ENGINE MECHANICAL CONDITION
 
AGING O2 SENSOR
 
CATALYTIC CONVERTER
 

Trouble Code: P0430



CATALYST 2/1 EFFICIENCY

Possible Causes:



GOOD TRIP EQUAL TO ZERO
 
VISUALLY INSPECT CATALYTIC CONVERTER
 
EXHAUST LEAK
 
ENGINE MECHANICAL CONDITION
 
AGING O2 SENSOR
 
CATALYTIC CONVERTER
 

Trouble Code: P0431



CATALYST 2/1 EFFICIENCY

Possible Causes:



GOOD TRIP EQUAL TO ZERO
 
VISUALLY INSPECT CATALYTIC CONVERTER
 
EXHAUST LEAK
 
ENGINE MECHANICAL CONDITION
 
AGING O2 SENSOR
 
CATALYTIC CONVERTER
 

Trouble Code: P0440



GENERAL EVAP SYSTEM FAILURE

Possible Causes:



GOOD TRIP EQUAL TO ZERO
 
VEHICLE HISTORY AND SERVICE BULLETIN INVESTIGATION
 
VISUAL AND PHYSICAL INSPECTION
 
EVAP PURGE SOLENOID VACUUM SUPPLY INSPECTION
 
EVAP PURGE SOLENOID
 
EVAP PURGE SOLENOID OPERATION
 
NVLD SWITCH OPERATION
 

Trouble Code: P0441



EVAP PURGE SYSTEM PERFORMANCE

Possible Causes:



GOOD TRIP EQUAL TO ZERO
 
VEHICLE HISTORY AND SERVICE BULLETIN INVESTIGATION
 
CHECKING EVAP PURGE SOLENOID FUNCTIONALITY
 
EVAP PURGE SOLENOID VACUUM SUPPLY
 
NVLD SWITCH OPERATION
 
VERIFY NVLD OPERATION
 

Trouble Code: P0443



EVAP PURGE SOLENOID CIRCUIT

Possible Causes:



GOOD TRIP EQUAL TO ZERO
 
EVAP PURGE SOLENOID
 
(K52) EVAP PURGE SOL CONTROL CIRCUIT OPEN
 
(K52) EVAP PURGE SOL CONTROL CIRCUIT SHORTED TO GROUND
 
(K70) EVAP PURGE SOL SIGNAL CIRCUIT OPEN
 
(K70) EVAP PURGE SOL SIGNAL CIRCUIT SHORTED TO GROUND
 
(K70) EVAP PURGE SOL SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE
 
PCM
 

Trouble Code: P0452



NVLD PRESSURE SWITCH STUCK CLOSED

Possible Causes:



GOOD TRIP EQUAL TO ZERO
 
VEHICLE HISTORY AND SERVICE BULLETIN INVESTIGATION
 
EVAP PURGE SOLENOID LEAKS/STUCK OPEN
 
(K70) EVAP PURGE SOL CONTROL CIRCUIT SHORTED TO GROUND
 
NVLD SWITCH OPERATION
 
NVLD ASSEMBLY
 
(K107) NVLD SWITCH SIGNAL CIRCUIT SHORTED TO GROUND
 
PCM
 

Trouble Code: P0453



NVLD PRESSURE SWITCH STUCK OPEN

Possible Causes:



NVLD SWITCH OPERATION
 
VEHICLE HISTORY AND SERVICE BULLETIN INVESTIGATION
 
NVLD ASSEMBLY
 
(K107) NVLD SWITCH SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE
 
(K107) NVLD SWITCH SIGNAL CIRCUIT OPEN
 
(K107) NVLD SWITCH SIGNAL CIRCUIT SHORTED TO THE (K106) SOLENOID CONTROL CIR-
 
CUIT
 
(Z913) GROUND CIRCUIT OPEN
 
PCM
 

Trouble Code: P0455



EVAP SYSTEM LARGE LEAK

Possible Causes:



GOOD TRIP EQUAL TO ZERO
 
VEHICLE HISTORY AND SERVICE BULLETIN INVESTIGATION
 
VISUAL AND PHYSICAL INSPECTION
 
VERIFY EVAPORATIVE EMISSION SYSTEM LEAK
 
EVAP PURGE SOLENOID OPERATION
 
NVLD SWITCH OPERATION
 
EVAPORATIVE EMISSION LEAK DETECTION
 
LEAK AT GAS CAP
 
GAS CAP
 

Trouble Code: P0456



EVAP SYSTEM SMALL LEAK

Possible Causes:



GOOD TRIP EQUAL TO ZERO
 
VEHICLE HISTORY AND SERVICE BULLETIN INVESTIGATION
 
VISUAL AND PHYSICAL INSPECTION
 
VERIFY EVAPORATIVE EMISSION SYSTEM LEAK
 
EVAP PURGE SOLENOID OPERATION
 
EVAPORATIVE EMISSION LEAK DETECTION
 
LEAK AT GAS CAP
 
GAS CAP
 
NVLD
 

Trouble Code: P0457



LOOSE FUEL CAP

Possible Causes:



LOOSE OR MISSING FUEL CAP
 

Trouble Code: P0461



FUEL LEVEL SENSOR NO.1 PERFORMANCE

Possible Causes:



GOOD TRIP EQUAL TO ZERO
 
VISUALLY INSPECT FUEL TANK
 
(N4) FUEL LEVEL SIGNAL CIRCUIT OPEN
 
(N4) FUEL LEVEL SIGNAL CIRCUIT SHORTED TO GROUND
 
(K900) SENSOR GROUND CIRCUIT OPEN
 
INTERNAL INSPECTION OF THE FUEL TANK
 
FUEL LEVEL SENSOR
 

 
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