Hyundai Car 1999-05

1.6L L4 VIN N Std 3

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Trouble Code: P1123



Fuel Trim Adaptive Air System Too Rich

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 MAP)
 
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: P1124



Fuel Trim Adaptive Air System Too Lean

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: P1127



Long Term Fuel Trim Multiplier System Too Rich

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 MAP)
 
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: P1128



Long Term Fuel Trim Multiplier System Too Lean

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: P01510



Idle Speed Control Actuator Opening Coil Circuit Shorted

Possible Causes:



Idle speed actuator opening coil circuit shorted to system power (B+)
 
Idle speed actuator is damaged or has failed
 
PCM has failed
 

Trouble Code: P01513



Idle Speed Control Actuator Opening Coil Circuit Open

Possible Causes:



Idle speed actuator opening coil circuit open or shorted to ground
 
Idle speed actuator is damaged or has failed
 
PCM has failed
 

Trouble Code: P01552



Idle Speed Control Actuator Closing Coil Circuit Shorted

Possible Causes:



Idle speed actuator closing coil circuit shorted to system power
 
Idle speed actuator is damaged or has failed
 
PCM has failed
 

Trouble Code: P01553



Idle Speed Control Actuator Closing Coil Circuit Open

Possible Causes:



Idle speed actuator closing coil circuit is open or shorted to ground
 
Idle speed actuator is damaged or has failed
 
PCM has failed
 

Trouble Code: P01586



Encoding Signal Circuit Not Rational

Possible Causes:



P/N switch signal circuit is open or shorted to ground
 
P/N switch signal circuit is shorted to system power
 
P/N switch is damaged or has failed
 
PCM has failed
 

Trouble Code: P01605



Rough Road Sensor Circuit Malfunction

Possible Causes:



Acceleration sensor circuit is open or shorted to ground
 
Acceleration sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P01606



Rough Road Sensor Circuit Not Valid

Possible Causes:



Acceleration sensor circuit is open or shorted to ground
 
Acceleration sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P01613



MIL Request Signal Circuit High Input

Possible Causes:



MIL request circuit between the PCM and TCM is shorted to system power
 

Trouble Code: P01624



Cooling Fan Relay Low Circuit

Possible Causes:



Cooling Fan Relay control circuit open or shorted to ground
 
Cooling Fan Relay power circuit from Main Relay is open
 
Cooling Fan Relay is damaged or has failed
 
PCM has failed
 
TSB 00-36-013 (9/00) contains information about this code
 

Trouble Code: P01625



Cooling Fan Relay High Circuit Malfunction

Possible Causes:



Cooling Fan Relay control circuit shorted to system power (B+)
 
Cooling Fan Relay is damaged or has failed
 
PCM has failed
 

 
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