Suzuki Forenza, Reno 2003-06

2.0L L4 - Std 1

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2.0L L4 - Std

Trouble Code: P0106



Manifold Air Pressure Sensor Range/Performance

Possible Causes:



Air leak present between vacuum passage and the MAP sensor
 
MAP sensor vacuum line clogged between sensor and manifold
 
MAP sensor is damaged, out-of-calibration or has failed
 
PCM has failed
 

Trouble Code: P0108



MAP Sensor Circuit High Input (Low Vacuum)

Possible Causes:



MAP sensor signal circuit is open between sensor and the PCM
 
MAP Sensor ground circuit is open between sensor and PCM
 
MAP sensor signal circuit is shorted to VREF or system power
 
MAP Sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P0112



Intake Air Temperature Sensor Circuit Low Input

Possible Causes:



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

Trouble Code: P0113



Intake Air Temperature Sensor Circuit High Input

Possible Causes:



IAT sensor signal circuit or ground circuit is open
 
IAT sensor signal circuit is shorted to VREF or system power
 
IAT sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P0117



Engine Coolant Temperature Sensor Circuit Low Input

Possible Causes:



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

Trouble Code: P0118



Engine Coolant Temperature Sensor Circuit High Input

Possible Causes:



ECT sensor signal circuit is open between sensor and the PCM
 
ECT sensor signal circuit is shorted to VREF or system power
 
ECT sensor ground circuit is open between sensor and PCM
 
ECT sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P0125



Insufficient Coolant Temperature For Closed Loop

Possible Causes:



Inspect for low coolant level or an incorrect coolant mixture
 
Check the operation of the thermostat (it may be stuck open)
 
ECT sensor signal circuit has high resistance
 
ECT sensor has failed
 

Trouble Code: P0128



Coolant Temperature Below Thermostat Regulating Temperature

Possible Causes:



Inspect for low coolant level or an incorrect coolant mixture
 
Check the operation of the thermostat (it may be stuck open)
 
ECT sensor signal circuit has high resistance
 
ECT sensor has failed
 

Trouble Code: P0131



HO2S-11 (Bank 1 Sensor 1) Circuit Low Input

Possible Causes:



HO2S signal ground circuit is open
 
HO2S is contaminated or has failed
 
Vehicle driven until it ran out of fuel, or while very low on fuel
 
PCM has failed
 

Trouble Code: P0132



HO2S-11 (Bank 1 Sensor 1) Circuit High Input

Possible Causes:



HO2S signal circuit is open or shorted to system power
 
Fuel supply system is too rich (fuel injector or regulator leaking)
 
HO2S is contaminated, damaged or has failed
 
PCM has failed
 
TSB TS015 (12/95) contains information related to this code
 

Trouble Code: P0133



HO2S-11 (Bank 1 Sensor 1) Slow Response

Possible Causes:



Air leaks in the intake manifold or exhaust manifold or pipes
 
IAT sensor or MAF sensor has deteriorated (out of calibration)
 
HO2S signal circuit is open or shorted to ground (intermittent)
 
HO2S contaminated with wrong fuel, has deteriorated or failed
 
PCM has failed
 
TSB TS015 (12/95) contains information related to this code
 

Trouble Code: P0134



HO2S-11 (Bank 1 Sensor 1) No Activity Detected

Possible Causes:



Air leaks in the intake manifold or exhaust manifold or pipes
 
HO2S is contaminated (wrong fuel), has deteriorated or failed
 
HO2S heater element is damaged or has failed
 
PCM has failed
 
TSB TS015 (12/95) contains information related to this code
 

Trouble Code: P0135



HO2S-11 (Bank 1 Sensor 1) Heater Circuit Malfunction

Possible Causes:



HO2S heater control circuit is open or shorted to ground
 
HO2S heater power circuit is open (check the IG fuse)
 
HO2S heater control circuit is shorted to power
 
HO2S heater is damaged or has failed
 
PCM has failed
 

Trouble Code: P0137



HO2S-12 (Bank 1 Sensor 2) Circuit Low Input

Possible Causes:



HO2S signal circuit open (sensor signal reads over 4.5v)
 
HO2S is shorted to ground
 
HO2S signal ground circuit is open
 
HO2S is contaminated or has failed
 
Vehicle driven until it ran out of fuel, or while very low on fuel
 
PCM has failed
 

Trouble Code: P0138



HO2S-12 (Bank 1 Sensor 2) Circuit High Input

Possible Causes:



HO2S signal circuit open (sensor signal reads over 4.5v)
 
HO2S is shorted to ground
 
HO2S signal ground circuit is open
 
HO2S is contaminated or has failed
 
Vehicle driven until it ran out of fuel, or while very low on fuel
 
PCM has failed
 

Trouble Code: P0140



HO2S-12 (Bank 1 Sensor 2) Circuit, No Activity Detected

Possible Causes:



Air leaks in the intake manifold or exhaust manifold or pipes
 
HO2S is contaminated (wrong fuel), has deteriorated or failed
 
HO2S heater element is damaged or has failed
 
PCM has failed
 
TSB TS015 (12/95) contains information related to this code
 

Trouble Code: P0141



HO2S-12 (Bank 1 Sensor2) Heater Circuit Malfunction

Possible Causes:



HO2S heater control circuit is open or shorted to ground
 
HO2S heater power circuit is open (check the IG fuse)
 
HO2S heater control circuit is shorted to power
 
HO2S heater is damaged or has failed
 
PCM has failed
 

Trouble Code: P0171



Fuel System Too Lean (Bank 1)

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 before or near where the front HO2S is mounted
 
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: P0172



Fuel System Too Rich (Bank 1)

Possible Causes:



Base engine "mechanical" fault affecting one or more cylinders
 
EVAP system component has failed or canister fuel saturated
 
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: P0201



Fuel Injector 1 Circuit Malfunction

Possible Causes:



Injector control circuit is open or shorted to ground
 
Injector power circuit is open (check power from the MFI relay)
 
Fuel injector is damaged or has failed
 

Trouble Code: P0202



Fuel Injector 2 Circuit Malfunction

Possible Causes:



Injector control circuit is open or shorted to ground
 
Injector power circuit is open (check power from the MFI relay)
 
Fuel injector is damaged or has failed
 

Trouble Code: P0203



Fuel Injector 3 Circuit Malfunction

Possible Causes:



Injector control circuit is open or shorted to ground
 
Injector power circuit is open (check power from the MFI relay)
 
Fuel injector is damaged or has failed
 

Trouble Code: P0204



Fuel Injector 4 Circuit Malfunction

Possible Causes:



Injector control circuit is open or shorted to ground
 
Injector power circuit is open (check power from the MFI relay)
 
Fuel injector is damaged or has failed
 

Trouble Code: P0300



Multiple Cylinder Misfire Detected

Possible Causes:



Air leak in the intake manifold, or in the EGR or PCM system
 
Base engine mechanical fault that affects one or more cylinders
 
Fuel delivery component fault that affects one or more cylinders (i.e., one or more contaminated, dirty or sticking fuel injectors)
 
Ignition system problem (coil or plug) in one or more cylinders
 

Trouble Code: P0301



Cylinder 1 Misfire Detected

Possible Causes:



Air leak in the intake manifold, or in the EGR or PCM system
 
Base engine mechanical fault that affects only one cylinder
 
Fuel delivery component fault that affects only one cylinder (i.e., a contaminated, dirty or sticking fuel injector)
 
Ignition system problem (coil or plug) that affects one cylinder
 

Trouble Code: P0302



Cylinder 2 Misfire Detected

Possible Causes:



Air leak in the intake manifold, or in the EGR or PCM system
 
Base engine mechanical fault that affects only one cylinder
 
Fuel delivery component fault that affects only one cylinder (i.e., a contaminated, dirty or sticking fuel injector)
 
Ignition system problem (coil or plug) that affects one cylinder
 

Trouble Code: P0303



Cylinder 3 Misfire Detected

Possible Causes:



Air leak in the intake manifold, or in the EGR or PCM system
 
Base engine mechanical fault that affects only one cylinder
 
Fuel delivery component fault that affects only one cylinder (i.e., a contaminated, dirty or sticking fuel injector)
 
Ignition system problem (coil or plug) that affects one cylinder
 

Trouble Code: P0304



Cylinder 4 Misfire Detected

Possible Causes:



Air leak in the intake manifold, or in the EGR or PCM system
 
Base engine mechanical fault that affects only one cylinder
 
Fuel delivery component fault that affects only one cylinder (i.e., a contaminated, dirty or sticking fuel injector)
 
Ignition system problem (coil or plug) that affects one cylinder
 

Trouble Code: P0327



Knock Sensor Circuit Low Input

Possible Causes:



Knock sensor signal circuit is shorted to sensor ground
 
Knock sensor signal circuit is shorted to chassis ground
 
Knock sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P0341



Camshaft Position Sensor Circuit Rationality

Possible Causes:



CMP sensor signal circuit is open between sensor and PCM
 
CMP sensor signal circuit is shorted to ground
 
CMP sensor power circuit is open (check power from the relay)
 
CMP sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P0342



Camshaft Position Sensor Circuit No Signal

Possible Causes:



CMP sensor signal circuit is open between sensor and PCM
 
CMP sensor signal circuit is shorted to ground
 
CMP sensor power circuit is open (check power from the relay)
 
CMP sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P0351



Ignition Control Circuit A Failed (Cylinders 1 and 4)

Possible Causes:



Circuit is open or shorted to ground
 
Circuit is open (check power from the MFI relay)
 
PCM is damaged or has failed
 

Trouble Code: P0352



Ignition Control Circuit B Failed (Cylinders 2 and 3)

Possible Causes:



Circuit is open or shorted to ground
 
Circuit is open (check power from the MFI relay)
 
PCM is damaged or has failed
 

Trouble Code: P0401



EGR System Fault (Too Much or Too Little Flow)

Possible Causes:



EGR stepper motor control circuit(s) open or shorted to ground
 
EGR stepper motor assembly is damaged or has failed
 
Exhaust connection to EGR valve is clogged or restricted
 
Catalytic converter or exhaust system is clogged or restricted
 
PCM has failed
 

Trouble Code: P0402



EGR System Fault (Too Much or Too Little Flow)

Possible Causes:



EGR stepper motor control circuit(s) open or shorted to ground
 
EGR stepper motor assembly is damaged or has failed
 
Exhaust connection to EGR valve is clogged or restricted
 
Catalytic converter or exhaust system is clogged or restricted
 
PCM has failed
 

Trouble Code: P0404



Exhaust Gas Recirculation Open Valve Position Error

Possible Causes:



EGR stepper motor control circuit(s) open or shorted to ground
 
EGR stepper motor assembly is damaged or has failed
 
Exhaust connection to EGR valve is clogged or restricted
 
Catalytic converter or exhaust system is clogged or restricted
 
PCM has failed
 

Trouble Code: P0405



Exhaust Gas Recirculation Pintle Position Low Voltage

Possible Causes:



EGR stepper motor control circuit(s) open or shorted to ground
 
EGR stepper motor assembly is damaged or has failed
 
Exhaust connection to EGR valve is clogged or restricted
 
Catalytic converter or exhaust system is clogged or restricted
 
PCM has failed
 

Trouble Code: P0406



Exhaust Gas Recirculation Pintle Position High Voltage

Possible Causes:



EGR stepper motor control circuit(s) open or shorted to ground
 
EGR stepper motor assembly is damaged or has failed
 
Exhaust connection to EGR valve is clogged or restricted
 
Catalytic converter or exhaust system is clogged or restricted
 
PCM has failed
 

Trouble Code: P0420



Catalyst Efficiency Below Normal (Bank 1)

Possible Causes:



Air leaks at the exhaust manifold or in the exhaust pipes
 
Catalytic converter is damaged, contaminated or has failed
 
Front HO2S or rear HO2S is contaminated with fuel or moisture
 
Front HO2S and/or the rear HO2S is loose in the mounting hole
 
Front HO2S is older (aged) than the rear HO2S (HO2S is lazy)
 

Trouble Code: P0441



EVAP System Leak Detected (very small leak)

Possible Causes:



Canister air valve (solenoid) is damaged or has failed
 
Charcoal canister is clogged, loaded with fuel or moisture
 
Fuel filler cap loose, cross-threaded, incorrect part or damaged
 
Fuel tank pressure sensor is damaged or has failed
 
Fuel tank or fuel tank sender assembly 'O' ring is leaking
 
Fuel tank vapor line(s) blocked, damaged or disconnected
 
Tank pressure control solenoid is contaminated or damaged
 
Purge solenoid control circuit is open or shorted to ground
 
Purge solenoid power circuit is open (test FI fuse in relay box)
 
Purge solenoid is contaminated, damaged or has failed
 
PCM has failed
 

 
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