Sentra 1997

1.6L L4 VIN A Auto 2

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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 older (aged) than the rear HO2S (HO2S is lazy)
 
TSB 01-068B (03/01) contains information related to this code
 

Trouble Code: P0420



Catalyst System Efficiency Below Threshhold (Includes Hybrid Models)

Possible Causes:



Three way catalyst (manifold)
 
Exhaust tube
 
Intake air leaks
 
Fuel injector
 
Fuel injector leaks
 
Spark plug
 
Improper ignition timing
 

Trouble Code: P0440



EVAP System Small Leak Detected

Possible Causes:



Fuel tank vacuum relief valve
 
Filler cap
 
Leak between EVAP canister purge valve and intake manifold
 
EVAP canister vent control valve
 
EVAP canister or fuel tank leaks
 
EVAP purge line
 
Hoses or tubes loose, disconnected, kinked or blocked
 
EVAP canister purge control valve or solenoid valve
 
Absolute pressure sensor
 
Fuel tank temperature sensor
 
MAP/BARO switch solenoid valve
 
EVAP canister vent valve O-ring damaged or missing
 
Water separator
 
EVAP canister saturated with water
 
EVAP control system pressure sensor
 
Refueling EVAP vapor cut valve
 
ORVR system leaks
 
 

Trouble Code: P0443



EVAP Canister Purge Control Solenoid Valve

Possible Causes:



Condition A: Check harness and connectors:
 
- circuit is open or shorted
 
Condition B: Check harness and connectors:
 
- circuit is open or shorted
 
EVAP canister purge control solenoid valve
 
MAF sensor
 
TP sensor
 
ECT sensor
 
EGR valve
 
Intake air leaks
 
Hoses
 
Canister control vacuum check switch
 
Condition C: Check harness and connectors:
 
- circuit is open or shorted
 
EVAP canister purge control solenoid valve
 
Hoses
 
Canister control vacuum check switch
 

Trouble Code: P0446



EVAP Vent Control Solenoid Circuit Malfunction

Possible Causes:



Vent solenoid circuit open, shorted to ground or to power (B+)
 
Vent control solenoid is damaged or has failed
 
PCM has failed
 
TSB 00-060 (7/00) contains information related to this code
 

Trouble Code: P0450



EVAP Control System Pressure Sensor

Possible Causes:



Harness or connectors
 
- Sensor circuit is open or shorted
 
Hose to sensor is loose or damaged
 
EVAP control system pressure sensor
 
EVAP canister purge volume control valve
 
EVAP canister vent control valve
 
EVAP canister
 
Hose to water separator loose or damaged
 

Trouble Code: P0455



EVAP Control System Gross Leak Detected (Includes Hybrid Models)

Possible Causes:



Fuel filler cap remains open or fails to close.
 
Incorrect fuel tank vacuum relief valve
 
Incorrect fuel filler cap used
 
Foreign matter caught in fuel filler cap
 
Leak is in line between intake manifold and EVAP canister purge volume control solenoid valve
 
Foreign matter caught in EVAP canister vent control valve.
 
EVAP canister or fuel tank leaks
 
EVAP purge line (pipe and rubber tube) leaks
 
EVAP purge line rubber tube bent.
 
Loose or disconnected rubber tube
 
EVAP canister vent control valve and the circuit
 
Drain filter
 
EVAP canister purge volume control solenoid valve and the circuit
 
Fuel tank temperature sensor
 
O-ring of EVAP canister vent control valve is missing or damaged.
 
EVAP control system pressure sensor
 
Refueling EVAP vapor cut valve
 
ORVR system leaks
 

Trouble Code: P0460



Fuel Level Sensor Circuit Noise (Includes Hybrid Models)

Possible Causes:



Harness or connectors
 
- CAN communication line is open or shorted
 
- Fuel level sensor circuit is open or shorted
 
Combination meter (unified meter and A/C amp.)
 
Fuel level sensor
 

Trouble Code: P0461



Fuel Level Sensor Circuit Range/Performance (Includes Hybrid Models)

Possible Causes:



Harness or connectors
 
- CAN communication line is open or shorted
 
- Fuel level sensor circuit is open or shorted
 
Combination meter (unified meter and A/C amp.)
 
Fuel level sensor
 

Trouble Code: P0464



Fuel Level Sensor Circuit Malfunction

Possible Causes:



Fuel level sensor signal circuit is open or shorted to ground
 
Fuel level sensor signal circuit shorted to VREF or power (B+)
 
Fuel level sensor is damaged or has failed
 
PCM is damaged
 

Trouble Code: P0500



Vehicle Speed Sensor Circuit

Possible Causes:



Harness or connector
 



ABS/TCS control unit is damaged or has failed
 
Combination meter is damaged or has failed
 
VSS signal circuit is open, shorted to ground or shorted to B+
 
VSS is damaged or has failed
 
PCM has failed
 

Trouble Code: P0505



Idle Air Control, Auxiliary Air Control Valve Circuit Malfunction

Possible Causes:



IACV-AAC valve control circuit is open or shorted to ground
 
IACV-AAC valve control circuit is shorted to system power (B+)
 
IACV-AAC valve is damaged or has failed
 
PCM is damaged or has failed
 

Trouble Code: P0510



Throttle Position Switch Closed

Possible Causes:



Harness or connectors:
 
- check circuit for open or short
 
Throttle position switch
 
Throttle position sensor
 

Trouble Code: P0600



TCM (A/T) Communication Line Circuit Malfunction

Possible Causes:



TCM communication line circuit is open or shorted to ground
 
TCM communication line circuit shorted to VREF or power (B+)
 
TCM or PCM has failed
 

Trouble Code: P0605



PCM or ECM Internal Fault Detected

Possible Causes:



Clear the codes and retest for DTC P0605. If the same code resets, substitute a known good PCM and retest. If the code does not reset, the original PCM or ECM has failed.
 

Trouble Code: P0705



Transmission Range Sensor A Circuit (PRNDL Input)

Possible Causes:



Harness or connectors
 
- Transmission range switches circuit is open or shorted.
 
Transmission range switch
 

Trouble Code: P0705



Park Neutral Position Switch Circuit Malfunction

Possible Causes:



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

Trouble Code: P0710



A/T Fluid Temperature Sensor & A/T Control Unit Power Source Circuit

Possible Causes:



Check harness and connectors:
 
- circuit is open or shorted
 
Fluid temperature sensor
 

Trouble Code: P0720



Vehicle Speed Sensor (A/T Revolution Sensor)

Possible Causes:



Check harness and connectors:
 
- circuit is open or shorted
 
Vehicle speed sensor (revolution sensor)
 

Trouble Code: P0725



Engine Speed Signal

Possible Causes:



Check harness and connectors:
 
- circuit is open or shorted
 

Trouble Code: P0731



A/T 1st Gear Function

Possible Causes:



Shift solenoid valve A (off stick)
 
2nd brake
 
2nd coast brake
 
One-way clutch No.1
 
One-way clutch No.2
 
Hydraulic control circuit
 

Trouble Code: P0732



A/T 2nd Gear Function

Possible Causes:



Shift solenoid valve A (On stick)
 
Shift solenoid valve B (On stick)
 
Shift solenoid valve C (Off stick)
 
Shift solenoid valve D (On stick)
 
Pressure control solenoid valve A (On stick)
 
Pressure control solenoid valve C (On stick)
 
U/D brake
 
2nd coast brake
 
2nd brake
 
One-way clutch No.1
 
One-way clutch No.2
 
B5 brake
 
Hydraulic control circuit
 

Trouble Code: P0733



A/T 3rd Gear Function

Possible Causes:



Shift solenoid valve A (On stick)
 
Shift solenoid valve B (On stick)
 
Shift solenoid valve C (Off stick)
 
Shift solenoid valve D (Off stick)
 
Pressure control solenoid valve A (On stick)
 
B5 brake
 
U/D clutch
 
U/D brake
 
Hydraulic control circuit
 

Trouble Code: P0734



A/T 4th Gear Function

Possible Causes:



Shift solenoid valve A (On stick.)
 
Shift solenoid valve B (On stick.)
 
Shift solenoid valve C (On stick.)
 
Pressure control solenoid valve A (On stick.)
 
Forward and direct clutch assembly
 
U/D clutch
 
U/D brake
 
2nd coast brake
 
One-way clutch No.1
 
Hydraulic control circuit
 

Trouble Code: P0740



Torque Converter Clutch Solenoid Valve

Possible Causes:



Torque converter clutch solenoid valve
 
Harness or connectors
 
- Solenoid circuit is open or shorted.
 

Trouble Code: P0744



A/T TCC S/V Function (Lock-Up)

Possible Causes:



Harness or connectors
 
- The solenoid circuit is open or shorted.
 
Torque converter clutch solenoid valve
 
Hydraulic control circuit
 

Trouble Code: P0745



Pressure Control Solenoid A

Possible Causes:



Harness or connectors
 
- The solenoid circuit is open or shorted.
 
Line pressure solenoid valve
 

Trouble Code: P0750



Shift Solenoid Valve A Circuit

Possible Causes:



Check harness and connectors:
 
- circuit is open or shorted
 
Shift solenoid valve A
 

Trouble Code: P0755



Shift Solenoid Valve B Circuit

Possible Causes:



Check harness and connectors:
 
- circuit is open or shorted
 
Shift solenoid valve B
 

Trouble Code: P0850



Park/Neutral Position Switch

Possible Causes:



Harness or connectors
 
- Park/neutral position (PNP) switch circuit is open or shorted.
 
Park/neutral position (PNP) switch
 

Trouble Code: P1105



MAP/BARO Switch Solenoid Valve

Possible Causes:



Harness or connectors:
 
- check circuit for open or short or connectors loose or damaged
 
Hoses
 
Absolute pressure sensor
 
MAP/BARO switch solenoid valve
 

Trouble Code: P1126



Thermostat Malfunction (Stuck Open)

Possible Causes:



Inspect for low coolant level
 
Inspect for incorrect coolant mixture
 
Check the operation of the thermostat (it may be stuck open)
 

Trouble Code: P1148



Closed Loop Control Function (Includes Hybrid Models)

Possible Causes:



Harness or connectors
 
- Air fuel ratio (A/F) sensor (sensor 1 on V6 and V8) circuit is open or shorted.
 
Air fuel ratio (A/F) sensor (sensor 1 on V6 and V8)
 
Air fuel ratio (A/F) sensor (sensor 1 on V6 and V8) heater
 

Trouble Code: P1168



Closed Loop Control Function (Bank 2)

Possible Causes:



Harness or connectors
 
- Air fuel ratio (A/F) sensor 1 or 2 circuit is open or shorted.
 
Air fuel ratio (A/F) sensor 1 or 2
 
Air fuel ratio (A/F) sensor 1 or 2 heater
 

Trouble Code: P1220



Fuel Pump Control Module (FPCM)

Possible Causes:



Harness or connectors
 
- FPCM circuit is shorted
 
Dropping resistor
 
FPCM
 

Trouble Code: P1320



Ignition Control Signal Circuit Malfunction

Possible Causes:



Ignition coil primary circuit is open or shorted
 
Ignition coil condenser is shorted
 
CKP sensor signal is erratic, missing or the sensor has failed
 
CMP sensor signal is erratic, missing or the sensor has failed
 
TSB 01-052 (9/01) contains information related to this code
 

Trouble Code: P1320



Ignition Signal

Possible Causes:



Check harness and connectors:
 
- circuit is open or shorted
 
Power transistor unit
 
CMP sensor or circuit
 

Trouble Code: P1335



Crankshaft Position Reference Sensor Circuit Malfunction

Possible Causes:



CKP reference signal circuit is open or shorted to ground
 
CKP reference sensor is damaged or has failed
 
Starter motor or starter motor circuit is damaged (not working)
 

Trouble Code: P1336



Crankshaft Position (CKP) Sensor

Possible Causes:



Check harness and connectors:
 
- circuit is open or shorted
 
CKP sensor
 
Drive plate
 

Trouble Code: P1400



EGR Control Solenoid Circuit Malfunction

Possible Causes:



Harness and connectors:
 

- EGRC solenoid control circuit is shorted to system power



EGRC solenoid is damaged or has failed
 
PCM has failed
 

 
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