Liberty, Wrangler, 1997-2005

2.8L L4 VIN 5 Std 1

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2.8L L4 VIN 5 Std

Trouble Code: P0016



Crankshaft/Camshaft Timing Misalignment

Possible Causes:



Base engine problem (i.e., the camshaft timing is not correct)
 
Intermittent condition
 
CKP or CMP Sensor signal is erratic (check with lab scope)
 
Tone wheel or pulse wheel is damaged or contains debris
 
CKP or CMP Sensor, harness or connector has failed
 
PCM has failed
 

Trouble Code: P0031



O2 (B1 S1) Heater Circuit Low

Possible Causes:



O2 assembly is damaged or it has failed
 
O2 heater element is damaged or has failed
 
O2 heater control circuit is shorted to ground
 
PCM has failed
 

Trouble Code: P0032



O2 (B1 S1) Heater Circuit High

Possible Causes:



O2 heater element is damaged or the heater has failed
 
O2 heater control circuit is open or it is shorted to power
 
O2 heater ground circuit is open
 
PCM has failed
 

Trouble Code: P0037



O2 (B1 S2) Heater Circuit Low

Possible Causes:



O2 assembly is damaged or it has failed
 
O2 heater element is damaged or has failed
 
O2 heater control circuit is shorted to ground
 
PCM has failed
 

Trouble Code: P0038



O2 (B1 S2) Heater Circuit High

Possible Causes:



O2 Sensor failed or improper operation
 
O2 heater element is damaged or failed
 
O2 heater control circuit is open or it is shorted to power
 
O2 heater ground circuit is open
 
PCM has failed
 

Trouble Code: P0045



Boost Pressure Solenoid Excessive Current

Possible Causes:



Intermittent condition
 
Boost Pressure Solenoid has failed
 
BP Solenoid control circuit is shorted to voltage
 
ECM has failed
 

Trouble Code: P0047



Boost Pressure Solenoid Short To Ground Circuit

Possible Causes:



Intermittent condition
 
ASD relay output circuit is open
 
BP Solenoid control circuit is open or is shorted to ground
 
Boost Pressure Solenoid has failed
 
ECM has failed
 

Trouble Code: P0048



Boost Pressure Solenoid Short Circuit

Possible Causes:



Intermittent condition
 
Boost Pressure Solenoid has failed
 
BP Solenoid control circuit is shorted to voltage
 
ECM has failed
 

Trouble Code: P0051



O2 (B2 S1) Heater Relay Circuit Low

Possible Causes:



O2 assembly is damaged or it has failed
 
O2 heater element is damaged or has failed
 
O2 heater control circuit is shorted to ground
 
PCM has failed
 

Trouble Code: P0052



O2 (B2 S1) Heater Relay Circuit High

Possible Causes:



O2 heater element is damaged or the heater has failed
 
O2 heater control circuit is open or it is shorted to power
 
O2 heater ground circuit is open
 
PCM has failed
 

Trouble Code: P0057



O2 (B2 S2) Heater Relay Circuit Low

Possible Causes:



O2 assembly is damaged or it has failed
 
O2 heater element is damaged or has failed
 
O2 heater control circuit is shorted to ground
 
PCM has failed
 

Trouble Code: P0058



O2 (B2 S2) Heater Relay Circuit High

Possible Causes:



O2 heater element is damaged or the heater has failed
 
O2 heater control circuit is open or it is shorted to power
 
O2 heater ground circuit is open
 
PCM has failed
 

Trouble Code: P0068



MAP Sensor/TP Sensor Correlation

Possible Causes:



An engine vacuum leak present
 
High resistance in the MAP ground circuit, MAP Sensor signal or VREF (5v) circuit
 
High resistance in the TP ground, TP circuit or the TP Sensor VREF (5v) circuit
 
MAP Sensor is damaged or it has failed
 
TP Sensor is damaged or it has failed
 
PCM has failed
 

Trouble Code: P0070



Ambient Air Temperature Signal Voltage Too High

Possible Causes:



Intermittent condition
 
AAT Sensor signal circuit is open or is shorted to voltage
 
AAT Sensor ground circuit is open
 
AAT Sensor has failed
 
ECM has failed
 

Trouble Code: P0071



Ambient Temperature Sensor Performance

Possible Causes:



AAT Sensor circuit open, shorted to ground or VREF
 
AAT Sensor voltage below 1.0v
 
AAT signal circuit is open or is shorted to ground, to battery voltage or to Sensor ground
 
AAT Sensor ground circuit is open
 
AAT Sensor is damaged or it has failed
 
PCM High or Low circuit is damaged or it has failed
 

Trouble Code: P0072



Ambient Temperature Sensor Circuit Low Input

Possible Causes:



AAT Sensor internal failure
 
AAT signal circuit shorted to ground
 
AAT signal circuit shorted to Sensor ground
 
PCM has failed
 

Trouble Code: P0073



Ambient Temperature Sensor Circuit High Input

Possible Causes:



AAT Sensor signal shorted to VREF (5v) or battery voltage
 
AAT Sensor signal circuit or Sensor ground circuit is open
 
AAT Sensor is damaged (it may be open)
 
PCM has failed
 

Trouble Code: P0087



Fuel Rail Pressure Too Low Malfunction

Possible Causes:



Air in fuel system
 
Fuel injector problems
 
Fuel Pressure Solenoid has failed
 
Fuel Pump has malfunctioned or failed
 
Fuel system has contamination
 
Fuel system has a leak
 
Intermittent condition
 

Trouble Code: P0088



Fuel Rail Pressure Too High Malfunction

Possible Causes:



Air in fuel system
 
Fuel injector problems
 
Fuel Pressure Solenoid has failed
 
Fuel Pump has malfunctioned or failed
 
Fuel system has contamination
 
Fuel system has a leak
 
Intermittent condition
 

Trouble Code: P0089



Fuel Pressure Solenoid After-Run Plausibility

Possible Causes:



Air in fuel system
 
Fuel injector problems
 
Fuel Pressure Solenoid has failed
 
Fuel Pump has malfunctioned or failed
 
Fuel system has contamination
 
Fuel system has a leak
 
Intermittent condition
 

Trouble Code: P0090



Fuel Quality Solenoid Open Circuit

Possible Causes:



FQ Solenoid circuit(s) are open, shorted to ground, shorted to voltage, or shorted together
 
Intermittent condition
 
FQ Solenoid has failed
 
ECM has failed
 

Trouble Code: P0091



Fuel Quality Solenoid Short To Ground Circuit

Possible Causes:



FQ Solenoid circuit(s) are open, shorted to ground, shorted to voltage, or shorted together
 
Intermittent condition
 
FQ Solenoid has failed
 
ECM has failed
 

Trouble Code: P0092



Fuel Quality Solenoid Short Circuit

Possible Causes:



FQ Solenoid circuit(s) are open, shorted to ground, shorted to voltage, or shorted together
 
Intermittent condition
 
FQ Solenoid has failed
 
ECM has failed
 

Trouble Code: P0100



MAF Sensor Signal Voltage Too Low Or Too High

Possible Causes:



ASD relay output circuit is open
 
ECM 5v supply circuit problem
 
MAF Sensor ground circuit is open
 
MAF Sensor has failed
 
Intermittent condition
 
MAF Sensor signal circuit is open or is shorted to ground or shorted to MAF Sensor ground
 
MAF Sensor 5v supply circuit is shorted to MAF Sensor ground circuit or shorted to ground
 
MAF Sensor ground circuit is open
 
MAF Sensor 5v supply circuit is shorted to voltage
 
MAF Sensor circuit is shorted to voltage
 
ECM has failed
 

Trouble Code: P0101



MAF Sensor Signal Negative Or Positive Deviation

Possible Causes:



Air filer problem
 
Air restriction in intake system
 
Air leak(s) in intake system
 
MAF Sensor has failed
 
Intermittent condition
 

Trouble Code: P0105



Inlet Pressure Sensor Signal Plausibility

Possible Causes:



Air filer problem
 
Air restriction in intake system
 
Intermittent condition
 
High resistance in Inlet Pressure Sensor signal circuit, ground circuit, or 5v supply circuit
 
ECM has failed
 

Trouble Code: P0107



MAP Sensor Circuit Low Input

Possible Causes:



5-volt supply circuit is open or shorted to ground
 
MAP Sensor signal circuit is shorted to ground or shorted to Sensor ground circuit
 
MAP Sensor has failed
 
PCM 5-volt supply circuit has failed
 

Trouble Code: P0108



MAP Sensor Circuit High Input

Possible Causes:



MAP Sensor signal circuit is open
 
MAP Sensor ground circuit is open
 
MAP Sensor signal circuit shorted to 5-volt supply circuit or to battery voltage
 
MAP Sensor has failed or it has failed (possible open circuit)
 
MAP Sensor has failed
 
PCM has failed
 

Trouble Code: P0110



IAT Sensor Signal Voltage Too Low Or Too High

Possible Causes:



Intermittent condition
 
IAT Sensor signal circuit is open or is shorted to voltage (too high)
 
IAT Sensor signal circuit is shorted to ground or to Sensor ground (too low)
 
IAT Sensor ground circuit is open (too high)
 
Boost Pressure/IAT Sensor has failed
 
ECM has failed
 

Trouble Code: P0111



IAT Sensor Performance

Possible Causes:



IAT Sensor signal circuit is open, shorted to ground or VREF
 
IAT Sensor ground circuit is open
 
IAT Sensor is damaged or it has failed
 
PCM High or Low circuit is damaged or it has failed
 

Trouble Code: P0112



IAT Sensor Circuit Low Input

Possible Causes:



IAT Sensor signal circuit is shorted to chassis ground
 
IAT Sensor signal circuit is shorted to Sensor ground
 
IAT Sensor is damaged or it has failed (an internal short circuit)
 
PCM has failed
 

Trouble Code: P0113



IAT Sensor Circuit High Input

Possible Causes:



IAT Sensor signal circuit shorted to VREF (5v)
 
IAT Sensor signal circuit is open, or the ground circuit is open
 
IAT Sensor is damaged or it has failed (an internal open circuit)
 
PCM has failed
 

Trouble Code: P0115



ECT Sensor Signal Voltage Too Low Or Too High

Possible Causes:



Intermittent condition
 
ECT Sensor signal circuit is open or is shorted to voltage (too high)
 
ECT Sensor signal circuit is shorted to ground or to Sensor ground (too low)
 
ECT Sensor ground circuit is open (too high)
 
Boost Pressure/IAT Sensor has failed
 
ECM has failed
 

Trouble Code: P0116



ECT Sensor Circuit Performance

Possible Causes:



ECT Sensor signal circuit is open or it is shorted battery voltage or to ground
 
ECT Sensor signal circuit is shorted to Sensor ground
 
ECT Sensor ground circuit is open
 
ECT Sensor is damaged or it has failed
 
PCM High or Low circuit is damaged or it has failed
 

Trouble Code: P0117



ECT Sensor Circuit Low Input

Possible Causes:



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

Trouble Code: P0121



TP Sensor No. 1 Does Not Agree With MAP

Possible Causes:



TP Sensor No. 1 signal circuit shorted to battery voltage
 
Resistance in either TP Sensor No. 1 or 2 signal circuit, 5v supply circuit or TP Sensor return circuit
 
TP Sensor No. 1 signal circuit shorted to group or to TP Sensor No. 2 signal circuit
 
5v supply circuit shorted to ground
 
TP Sensor or throttle body damaged or failed
 
PCM has failed
 

Trouble Code: P0122



TP Sensor No. 1 Circuit Low Input

Possible Causes:



TP Sensor sweep
 
Intermittent condition
 
5v supply circuit open or shorted to ground
 
TP Sensor No. 1 signal circuit shorted to ground or to Sensor return circuit
 
TP Sensor or throttle body damaged or has failed
 
PCM has failed
 

Trouble Code: P0123



TP Sensor/APPS Circuit High Input

Possible Causes:



Related TP Sensor engine DTCs present
 
Intermittent wiring or connector problem
 
TP signal circuit is open or is shorted to battery voltage or to 5v supply circuit
 
TP sensor has failed
 
TP sensor ground circuit is open
 
PCM has failed
 

Trouble Code: P0124



TP Sensor/APP Sensor Intermittent Circuit

Possible Causes:



Intermittent wiring and connector problems
 
APP Sensor has failed
 
TCM has failed
 

Trouble Code: P0125



Closed Loop Temperature Not Reached

Possible Causes:



Low coolant level
 
Improper thermostat operation or thermostat failure
 
ECT has failed
 

 
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