Neon, 2000-2005

2.4L L4 - Std 1

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2.4L L4 - 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: P0033



Surge Valve Solenoid Circuit Fault

Possible Causes:



Surge valve power supply is open (test power from ASD relay)
 
Surge valve solenoid circuit is open
 
Surge valve solenoid circuit is shorted to ground or power (B+)
 
Surge valve solenoid is damaged or it has failed
 
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: P0050



O2 (B2 S1) Heater Relay Circuit Low

Possible Causes:



O2 assembly is damaged, or the O2 heater element is damaged or has failed
 
O2 heater control circuit is shorted to ground
 
PCM 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: P0056



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: 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 Correction - High Flow/Vacuum Leak

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 Temperature Sensor Circuit Stuck

Possible Causes:



AAT Sensor signal circuit shorted to power (VREF)
 
AAT Sensor ground circuit is open
 
AAT Sensor signal circuit is open
 
AAT Sensor signal circuit is shorted to ground
 
PCM High or Low circuit is damaged or it 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: P0106



BARO Out-Of-Range at Key On / MAP Sensor Low

Possible Causes:



Loss of 5-volt supply from PCM (internal failure)
 
Sensor 5-volt supply circuit is shorted, open or grounded
 
Sensor signal circuit is open or shorted to ground
 
Sensor has failed
 
PCM has failed
 

Trouble Code: P0107



MAP Sensor Circuit Low Input

Possible Causes:



MAP Sensor connector is damaged or shorted
 
MAP Sensor 5v supply circuit is open or it is shorted to ground
 
MAP Sensor signal circuit is shorted to ground
 
MAP Sensor has failed
 
PCM has failed
 

Trouble Code: P0110



IAT Sensor Circuit High or Low Input

Possible Causes:



IAT Sensor signal circuit is open, shorted to ground or to VREF
 
IAT Sensor signal circuit has a high resistance condition
 
IAT Sensor is damaged or it has failed
 
PCM 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: P0116



ECT Sensor Circuit Performance

Possible Causes:



ECT Sensor signal circuit is open or it is shorted to ground
 
ECT Sensor signal circuit is shorted to VREF (5v)
 
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: P0118



ECT Sensor Circuit High Input

Possible Causes:



ECT Sensor signal circuit is shorted to VREF (5v)
 
ECT Sensor signal circuit is open
 
ECT Sensor ground circuit is open
 
ECT Sensor is damaged or it has failed (possible open circuit)
 
PCM has failed
 

Trouble Code: P0121



TP Sensor Does Not Agree With MAP

Possible Causes:



MAP Sensor and/or TP Sensor VREF (5v) not present
 
MAP or TP Sensor ground circuit has high resistance
 
MAP or TP Sensor signal circuit has high resistance
 
TP Sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P0122



TP Sensor Circuit Low Input

Possible Causes:



TP Sensor VREF (5v) circuit is open or shorted to ground
 
TP Sensor 5v supply circuit is shorted to ground
 
TP Sensor signal circuit is shorted to ground
 
TP Sensor is damaged or it has failed
 
Possible intermittent condition
 
PCM has failed
 

Trouble Code: P0123



TP Sensor Circuit High Input

Possible Causes:



TP Sensor sweep
 
TP Sensor ground circuit is open
 
TP Sensor signal circuit is open or is shorted to VREF (5v)
 
TP Sensor is damaged or has failed (an internal open circuit)
 
Possible intermittent condition
 
PCM has failed
 

Trouble Code: P0125



Closed Loop Temperature Not Reached

Possible Causes:



Check the operation of the thermostat (it may be stuck open)
 
ECT Sensor is damaged or it is out-of-calibration
 
Inspect for low coolant level or for an incorrect coolant mixture
 

Trouble Code: P0128



Thermostat Rationality Test

Possible Causes:



Check the operation of the thermostat (it may be stuck open)
 
ECT Sensor is contaminated, damaged or it has failed
 
Inspect for low coolant level or for an incorrect coolant mixture
 

Trouble Code: P0129



Barometric Pressure Out-Of-Range

Possible Causes:



IAC signal circuit is low or high
 
Intermittent condition
 
5v supply circuit is open or shorted to ground or to voltage
 
MAP Sensor signal circuit is open or shorted to ground
 
MAP Sensor is damaged or it has failed
 
PCM has failed
 

Trouble Code: P0131



O2 (B1 S1) Short to Ground

Possible Causes:



O2 signal circuit is shorted to chassis or Sensor ground
 
O2 ground circuit is open (circuit reads 170 mV when open)
 
O2 may be contaminated or it has failed
 
PCM has failed
 

Trouble Code: P0132



O2 (B1 S1) Circuit Short to Voltage

Possible Causes:



O2 signal circuit shorted to heater B+ circuit (inspect the connector for oil or moisture inside the terminal area)
 
O2 signal circuit is 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 element is fuel contaminated
 
O2 element is deteriorated or it has failed
 

Trouble Code: P0134



O2 (B1 S1) Remains At Center

Possible Causes:



Exhaust leak present in exhaust manifold or exhaust pipes
 
O2 element is fuel contaminated or has deteriorated
 
O2S signal circuit or ground circuit has high resistance
 
PCM has failed
 

Trouble Code: P0135



O2 (B1 S1) Heater Circuit

Possible Causes:



ASD relay output (power) circuit to the heater is open
 
O2 heater ground circuit is open
 
O2 heater element is damaged or has high resistance
 
PCM has failed
 

Trouble Code: P0137



O2 (B1 S2) Circuit Short to Ground

Possible Causes:



O2 signal tracking in connector due to wet/oil conditions
 
O2 signal circuit is open, or the ground circuit is open
 
O2 heater supply circuit is open
 
PCM has failed
 

Trouble Code: P0138



O2 (B1 S2) Circuit Short to Voltage

Possible Causes:



O2 signal tracking (wet/oily) causing a short to heater power
 
O2 signal circuit open, or ground circuit open
 
PCM has failed
 

Trouble Code: P0139



O2 (B1 S2) Slow Response

Possible Causes:



Exhaust leak present in the exhaust manifold or exhaust pipes
 
O2 element is contaminated, deteriorated or it has failed
 
O2 ground or O2 signal circuit has high resistance
 

 
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