Pacifica 2006-2008

3.8L V6 VIN L Auto 4

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Trouble Code: P0302



CYLINDER #2 MISFIRE

Possible Causes:



INTERMITTENT MISFIRE
 
VISUAL AND PHYSICAL INSPECTION
 
IGNITION WIRE
 
ASD RELAY OUPUT CIRCUIT (COIL)
 
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 OPERATION
 
ASD RELAY OUTPUT CIRCUIT (INJECTOR)
 
FUEL INJECTOR
 
INJECTOR CONTROL CIRCUIT
 
PCM (IGNITION SYSTEM)
 
PCM
 

Trouble Code: P0302



Cylinder 1-6 Misfire Detected

Possible Causes:



Intermittent misfire
 
Base engine mechanical fault that affects only 1 cylinder
 
Ignition wiring, coil control circuit or coil fault
 
ASD relay output circuit (coil or injector) problem
 
Spark plug malfunction or failure on 1 cylinder
 
CMP Sensor, Sensor wiring harness or tone wheel is damaged
 
Fuel delivery component fault that affects only 1 cylinder (e.g., a dirty fuel injector)
 
Injector or control circuit failure
 
PCM has failed
 

Trouble Code: P0303



CYLINDER #3 MISFIRE

Possible Causes:



INTERMITTENT MISFIRE
 
VISUAL AND PHYSICAL INSPECTION
 
IGNITION WIRE
 
ASD RELAY OUPUT CIRCUIT (COIL)
 
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 OPERATION
 
ASD RELAY OUTPUT CIRCUIT (INJECTOR)
 
FUEL INJECTOR
 
INJECTOR CONTROL CIRCUIT
 
PCM (IGNITION SYSTEM)
 
PCM
 

Trouble Code: P0303



Cylinder 1-6 Misfire Detected

Possible Causes:



Intermittent misfire
 
Base engine mechanical fault that affects only 1 cylinder
 
Ignition wiring, coil control circuit or coil fault
 
ASD relay output circuit (coil or injector) problem
 
Spark plug malfunction or failure on 1 cylinder
 
CMP Sensor, Sensor wiring harness or tone wheel is damaged
 
Fuel delivery component fault that affects only 1 cylinder (e.g., a dirty fuel injector)
 
Injector or control circuit failure
 
PCM has failed
 

Trouble Code: P0304



CYLINDER #4 MISFIRE

Possible Causes:



INTERMITTENT MISFIRE
 
VISUAL AND PHYSICAL INSPECTION
 
IGNITION WIRE
 
ASD RELAY OUPUT CIRCUIT (COIL)
 
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 OPERATION
 
ASD RELAY OUTPUT CIRCUIT (INJECTOR)
 
FUEL INJECTOR
 
INJECTOR CONTROL CIRCUIT
 
PCM (IGNITION SYSTEM)
 
PCM
 

Trouble Code: P0304



Cylinder 1-6 Misfire Detected

Possible Causes:



Intermittent misfire
 
Base engine mechanical fault that affects only 1 cylinder
 
Ignition wiring, coil control circuit or coil fault
 
ASD relay output circuit (coil or injector) problem
 
Spark plug malfunction or failure on 1 cylinder
 
CMP Sensor, Sensor wiring harness or tone wheel is damaged
 
Fuel delivery component fault that affects only 1 cylinder (e.g., a dirty fuel injector)
 
Injector or control circuit failure
 
PCM has failed
 

Trouble Code: P0305



CYLINDER #5 MISFIRE

Possible Causes:



INTERMITTENT MISFIRE
 
VISUAL AND PHYSICAL INSPECTION
 
IGNITION WIRE
 
ASD RELAY OUPUT CIRCUIT (COIL)
 
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 OPERATION
 
ASD RELAY OUTPUT CIRCUIT (INJECTOR)
 
FUEL INJECTOR
 
INJECTOR CONTROL CIRCUIT
 
PCM (IGNITION SYSTEM)
 
PCM
 

Trouble Code: P0305



Cylinder 1-6 Misfire Detected

Possible Causes:



Intermittent misfire
 
Base engine mechanical fault that affects only 1 cylinder
 
Ignition wiring, coil control circuit or coil fault
 
ASD relay output circuit (coil or injector) problem
 
Spark plug malfunction or failure on 1 cylinder
 
CMP Sensor, Sensor wiring harness or tone wheel is damaged
 
Fuel delivery component fault that affects only 1 cylinder (e.g., a dirty fuel injector)
 
Injector or control circuit failure
 
PCM has failed
 

Trouble Code: P0306



CYLINDER #6 MISFIRE

Possible Causes:



INTERMITTENT MISFIRE
 
VISUAL AND PHYSICAL INSPECTION
 
IGNITION WIRE
 
ASD RELAY OUPUT CIRCUIT (COIL)
 
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 OPERATION
 
ASD RELAY OUTPUT CIRCUIT (INJECTOR)
 
FUEL INJECTOR
 
INJECTOR CONTROL CIRCUIT
 
PCM (IGNITION SYSTEM)
 
PCM
 

Trouble Code: P0306



Cylinder 1-6 Misfire Detected

Possible Causes:



Intermittent misfire
 
Base engine mechanical fault that affects only 1 cylinder
 
Ignition wiring, coil control circuit or coil fault
 
ASD relay output circuit (coil or injector) problem
 
Spark plug malfunction or failure on 1 cylinder
 
CMP Sensor, Sensor wiring harness or tone wheel is damaged
 
Fuel delivery component fault that affects only 1 cylinder (e.g., a dirty fuel injector)
 
Injector or control circuit failure
 
PCM has failed
 

Trouble Code: P0315



NO CRANK SENSOR LEARNED

Possible Causes:



DTC VERIFICATION
 
TONE WHEEL/PULSE RING INSPECTION
 
WIRING HARNESS INSPECTION
 
CRANKSHAFT POSITION SENSOR
 

Trouble Code: P0315



No Crankshaft Position Sensor Learned

Possible Causes:



Crankshaft tone wheel flex plate is damaged
 
Tone wheel/pulse ring may be damaged
 
Erratic CKP Sensor signals (wiring/connector problem)
 
CKP Sensor has failed
 
PCM has failed
 

Trouble Code: P0325



KNOCK SENSOR #1 CIRCUIT

Possible Causes:



GOOD TRIP EQUAL TO ZERO
 
(K42) KS SIGNAL CIRCUIT SHORTED TO VOLTAGE
 
(K42) KS SIGNAL CIRCUIT SHORTED TO GROUND
 
(K42) KS SIGNAL CIRCUIT OPEN
 
(K42) KS SIGNAL CIRCUIT SHORTED TO (K45) KS RETURN CIRCUIT
 
(K45) KS RETURN CIRCUIT OPEN
 
KNOCK SENSOR
 

Trouble Code: P0325



Knock Sensor No. 1 Circuit

Possible Causes:



Knock Sensor connector is damaged or shorted
 
Knock Sensor signal circuit open or grounded
 
Knock Sensor signal circuit shorted to return circuit
 
Knock Sensor return circuit is open
 
Knock Sensor not tightened properly
 
Knock Sensor damaged or has failed (it may be open internally)
 
PCM has failed
 

Trouble Code: P0330



Knock Sensor No. 2 Circuit

Possible Causes:



Knock Sensor No. 2 signal circuit shorted to battery voltage or to KS 2 return circuit
 
Knock Sensor No. 2 signal circuit or return circuit is open
 
Knock Sensor No. 2 signal circuit is shorted to KS 2 return circuit or to ground
 
Knock Sensor damaged or has failed
 
PCM has failed
 

Trouble Code: P0335



CRANKSHAFT POSITION SENSOR CIRCUIT

Possible Causes:



CHECKING INTERMITTENT CMP SIGNAL WITH LAB
 
INTERMITTENT CKP SIGNAL
 
(K6) 5 VOLT SUPPLY CIRCUIT SHORTED TO GROUND
 
(K6) 5 VOLT SUPPLY CIRCUIT OPEN
 
(K6) 5 VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE
 
(K24) CKP SIGNAL CIRCUIT SHORTED GROUND
 
(K24) CKP SIGNAL CIRCUIT OPEN
 
(K24) CKP SIGNAL CIRCUIT SHORTED TO VOLTAGE
 
(K24) CKP SIGNAL SHORTED TO (K6) 5 VOLT SUPPLY CIRCUIT
 
(K4) SENSOR GROUND CIRCUIT OPEN
 
PCM - (K6) 5 VOLT SUPPLY
 
PCM - (K24) CKP SIGNAL
 
CRANKSHAFT POSITION SENSOR
 

Trouble Code: P0335



Crankshaft Position Sensor Circuit

Possible Causes:



Intermittent CKP signal
 
CKP Sensor signal circuit is open or it is shorted to ground or voltage
 
CKP Sensor 5V supply circuit is open or shorted to ground or voltage
 
CKP Sensor ground circuit is open
 
CKP Sensor or CMP Sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P0339



CRANKSHAFT POSITION SENSOR INTERMITTENT

Possible Causes:



GOOD TRIP EQUAL TO ZERO
 
WIRING HARNESS INSPECTION
 
(K6) 5 VOLT SUPPLY CIRCUIT OPEN OR SHORTED TO GROUND
 
TONE WHEEL/PULSE RING INSPECTION
 
CHECKING CAMSHAFT POSITION SENSOR SIGNAL WITH THE DRBIII- LAB
 
CRANKSHAFT POSITION SENSOR
 
(K24) CKP SIGNAL CIRCUIT OPEN
 
(K24) CKP SIGNAL CIRCUIT SHORT TO GROUND
 
(K24) CKP SIGNAL CIRCUIT SHORTED TO B+
 
(K24) CKP SIGNAL CIRCUIT SHORT TO (K6) 5 VOLTS
 
PCM
 

Trouble Code: P0339



Crankshaft Position Sensor Circuit Intermittent

Possible Causes:



Check the tone wheel/pulse ring for damage or debris collection
 
CKP Sensor signal circuit is open or shorted to ground
 
CKP Sensor 5V supply circuit is open or shorted to ground
 
CKP Sensor is damaged or it has failed
 
PCM has failed
 

Trouble Code: P0340



CAMSHAFT POSITION SENSOR CIRCUIT

Possible Causes:



INTERMITTENT CRANKSHAFT POSITION SENSOR SIGNAL
 
INTERMITTENT CAMSHAFT POSITION SENSOR SIGNAL
 
(K6) 5 VOLT SUPPLY CIRCUIT SHORTED TO GROUND
 
(K6) 5 VOLT SUPPLY CIRCUIT OPEN
 
(K6) 5 VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE
 
(K44) CMP SIGNAL CIRCUIT SHORTED GROUND
 
(K44) CMP SIGNAL CIRCUIT OPEN
 
(K44) CMP SIGNAL CIRCUIT SHORTED TO VOLTAGE
 
(K44) CMP SIGNAL SHORTED TO (K6) 5 VOLT SUPPLY CIRCUIT
 
(K4) SENSOR GROUND CIRCUIT OPEN
 
PCM - (K6) 5 VOLT SUPPLY
 
PCM - (K44) CMP SIGNAL
 
CAMSHAFT POSITION SENSOR
 

Trouble Code: P0340



No Camshaft Position Sensor Circuit Failure

Possible Causes:



CMP Sensor connector is damaged, open or it is shorted
 
CMP Sensor signal circuit is open or shorted to ground or to battery voltage or 5V supply circuit
 
CMP Sensor 5V supply circuit is open or shorted to ground or to battery voltage
 
CMP Sensor ground circuit is open
 
CMP Sensor is damaged or has failed
 
CKP Sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P0344



CAMSHAFT POSITION SENSOR INTERMITTENT

Possible Causes:



GOOD TRIP EQUAL TO ZERO
 
WIRING HARNESS INSPECTION
 
(K6) 5 VOLT SUPPLY CIRCUIT OPEN OR SHORTED TO GROUND
 
TONE WHEEL/PULSE RING INSPECTION
 
CHECKING CKP SIGNAL WITH THE DRBIII- LAB
 
CAMSHAFT POSITION SENSOR
 
(K44) CMP SIGNAL CIRCUIT OPEN
 
(K44) CMP SIGNAL CIRCUIT SHORT TO GROUND
 
(K44) CMP SIGNAL CIRCUIT SHORTED TO B+
 
(K44) CMP SIGNAL CIRCUIT SHORT TO (K6) 5 VOLTS
 
PCM
 

Trouble Code: P0344



Camshaft Position Sensor Circuit Intermittent

Possible Causes:



Wiring harness fault
 
5V supply circuit open or shorted to ground
 
Tone wheel/pulse ring is damaged or corroded
 
CMP Sensor has failed
 
CMP Sensor signal circuit is open, shorted to ground or battery voltage or 5V supply
 
CMP Sensor ground circuit is open
 
PCM has failed
 

Trouble Code: P0401



EGR SYSTEM PERFORMANCE

Possible Causes:



GOOD TRIP EQUAL TO ZERO
 
EGR VALVE OPEN AT IDLE
 
EGR VALVE ASSEMBLY INSPECTION
 
EGR SOLENOID ASSEMBLY
 
EGR SOLENOID GROUND CIRCUIT OPEN
 
EGR SOLENOID CONTROL CKT SHORT TO GND
 
EGR SOLENOID CONTROL CKT SHORTED TO VOLTAGE
 
EGR SOLENOID CONTROL CKT OPEN
 
PCM - EGR OPEN
 
PCM - EGR CLOSED
 

Trouble Code: P0401



EGR System Fault

Possible Causes:



EGR valve is open at idle
 
EGR solenoid ground circuit is open
 
EGR solenoid control circuit is open, shorted to ground or to voltage
 
ASD relay power circuit open to the EGR solenoid
 
EGR valve or solenoid is damaged or has failed
 
PCM has failed (EGR open or EGR closed)
 

Trouble Code: P0403



EGR CONTROL CIRCUIT

Possible Causes:



GOOD TRIP EQUAL TO ZERO
 
EGR SOLENOID ASSEMBLY
 
EGR SOLENOID GROUND CIRCUIT OPEN
 
EGR SOLENOID CONTROL CIRCUIT SHORTED TO VOLTAGE
 
EGR SOLENOID CONTROL CIRCUIT SHORT TO GND
 
EGR SOLENOID CONTROL CIRCUIT SHORTED TO SENSOR GROUND CIRCUIT
 
EGR SOLENOID CONTROL CIRCUIT OPEN
 
PCM
 

Trouble Code: P0403



EGR Solenoid Circuit

Possible Causes:



EGR solenoid ground circuit is open
 
EGR solenoid control circuit is open or shorted to ground or to voltage
 
EGR solenoid power circuit is open
 
EGR solenoid is damaged or has failed
 
PCM has failed
 

Trouble Code: P0404



EGR POSITION SENSOR PERFORMANCE

Possible Causes:



GOOD TRIP EQUAL TO ZERO
 
HIGH RESISTANCE IN 5 VOLT SUPPLY
 
EGR SENSOR SIGNAL CIRCUIT OPEN
 
EGR ASSEMBLY
 
EGR SOLENOID CONTROL CKT
 
INTERMITTENT CONDITION
 
EGR SENSOR SIGNAL CIRCUIT OPEN
 
EGR SENSOR SIGNAL CIRCUIT SHORTED TO GROUND
 
SENSOR GROUND CIRCUIT OPEN
 
EGR ASSEMBLY (GROUND)
 
PCM
 

Trouble Code: P0404



EGR Position Sensor Signal Performance

Possible Causes:



EGR Sensor signal circuit is open or shorted to ground
 
EGR Sensor 5V supply circuit is open or has high resistance
 
EGR Sensor ground circuit is open
 
EGR solenoid control circuit has a problem
 
EGR valve actuator loose, sticking, blocked or improperly grounded
 
EGR Sensor is damaged or has failed
 
Intermittent condition
 
PCM has failed
 

Trouble Code: P0405



EGR POSITION SENSOR LOW

Possible Causes:



EGR POSITION SENSOR SWEEP
 
INTERMITTENT CONDITION
 
5 VOLT SUPPLY CIRCUIT SHORTED TO GROUND
 
5 VOLT SUPPLY CIRCUIT OPEN
 
EGR POSITION INTERNAL FAILURE
 
EGR POSITION SENSOR SIGNAL CIRCUIT SHORTED TO GROUND
 
EGR POSITION SENSOR SIGNAL CIRCUIT SHORTED TO SENSOR GROUND CIRCUIT
 
PCM 5 VOLT SUPPLY CIRCUIT
 
PCM EGR POSITION SENSOR SIGNAL
 

Trouble Code: P0405



EGR Position Sensor Circuit Low Input

Possible Causes:



EGR Sensor signal circuit is shorted to ground or open
 
EGR Sensor VREF (5V) circuit is open or shorted to ground
 
EGR Sensor is damaged (shorted internally) or it has failed
 
EGR position internal failure
 
PCM has failed
 

Trouble Code: P0406



EGR POSITION SENSOR HIGH

Possible Causes:



EGR POSITION SENSOR SWEEP
 
INTERMITTENT CONDITION
 
EGR POSITION SENSOR SIGNAL CIRCUIT SHORTED TO 5 VOLT SUPPLY CIRCUIT
 
EGR POSITION SENSOR SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE
 
EGR SOLENOID ASSEMBLY INTERNAL FAILURE
 
EGR POSITION SENSOR SIGNAL CIRCUIT OPEN
 
SENSOR GROUND CIRCUIT OPEN
 
PCM
 

Trouble Code: P0406



EGR Position Sensor Circuit High Input

Possible Causes:



Intermittent condition
 
EGR Sensor signal is shorted to VREF (5V) supply circuit or to battery voltage
 
EGR Sensor ground circuit is open
 
EGR Sensor signal circuit is open
 
EGR Sensor is damaged (it may have an internal open circuit)
 
EGR solenoid failure
 
PCM has failed
 

Trouble Code: P0420



CATALYTIC 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: P0420



Catalyst Efficiency Below Normal (Bank 1)

Possible Causes:



Air leaks in at the exhaust manifold or exhaust pipes
 
Base engine problems (high coolant or engine oil consumption)
 
Catalytic converter damaged or has failed
 
FronT O2S1 older (aged) than the rear O2 (O2 is lazy)
 

Trouble Code: P0430



Catalyst (2/1) Efficiency Below Normal

Possible Causes:



Exhaust leaks
 
Base engine problems
 
Catalytic converter damaged or has failed
 
FronT O2S1 older (aged) than the rear O2 (O2 is lazy)
 

Trouble Code: P0432



Catalyst Efficiency Below Normal (Bank 2)

Possible Causes:



Air leaks in at the exhaust manifold or exhaust pipes
 
Base engine problems (high coolant or engine oil consumption)
 
Catalytic converter damaged or has failed
 
FronT O2S1 older (aged) than the rear O2 (O2 is lazy)
 

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
 
NVLD SWITCH OPERATION
 
(Z201) GROUND CIRCUIT OPEN
 
NVLD ASSEMBLY
 
(K107) NVLD SWITCH SIGNAL CIRCUIT OPEN
 
EVAPORATIVE EMISSION LEAK DETECTION
 
PCM
 

Trouble Code: P0440



EVAP Purge System Fault

Possible Causes:



EVAP purge valve vacuum supply is leaking or clogged
 
EVAP purge valve is stuck closed
 
EVAP purge solenoid has failed
 
NVLD assembly (leak detection) is damaged or has failed
 
NVLD switch circuit is open or the NVLD switch has failed
 
Ground circuit is open
 
PCM has failed
 

Trouble Code: P0441



EVAP PURGE SYSTEM PERFORMANCE

Possible Causes:



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

 
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