Sentra 1997

1.6L L4 VIN A Auto 3

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Trouble Code: P1400



EGR/EVAP Control Solenoid Circuit Malfunction

Possible Causes:



EGR/EVAP solenoid control circuit open or shorted to ground
 
EGR/EVAP solenoid is damaged or has failed
 
PCM has failed
 

Trouble Code: P1401



EGR Temperature Sensor

Possible Causes:



Check harness and connectors:
 
- circuit is open or shorted
 
EGR temperature sensor
 
EGR function
 
EGR control solenoid valve
 

Trouble Code: P1402



EGR Function (Open)

Possible Causes:



Harness or connectors
 
- The EGR volume control valve circuit is open or shorted.
 
EGR volume control valve leaking or stuck open
 
EGR temperature sensor
 

Trouble Code: P1440



EVAP Canister System Small Leak (0.040) Detected

Possible Causes:



Absolute pressure sensor is damaged or has failed
 
EVAP canister vent valve is damaged or contaminated
 
EVAP system leaks (in canister or related vapor lines)
 
EVAP control system vapor pressure sensor line is blocked
 
Fuel filler cap loose, damaged or incorrect application
 
Fuel tank temperature sensor is damaged or has failed
 
MAP/BARO switch solenoid valve is damaged or has failed
 
MAP/BARO switch solenoid vacuum line is blocked or bent
 

Trouble Code: P1441



Vacuum Cut Valve Bypass Valve Circuit Malfunction

Possible Causes:



EVAP vacuum cut valve bypass valve circuit is open
 
EVAP vacuum cut valve bypass valve circuit shorted to ground
 
EVAP vacuum cut valve bypass valve is damaged or has failed
 
PCM has failed
 

Trouble Code: P1444



EVAP Canister Purge Volume Control Solenoid Valve

Possible Causes:



- EVAP control system pressure sensor
 
- EVAP canister purge volume control solenoid valve; valve is stuck open
 
- EVAP canister vent control valve
 
- EVAP canister
 
- Hoses are connected incorrectly or clogged
 

Trouble Code: P1445



Canister Purge Volume Control Valve Malfunction

Possible Causes:



EVAP canister vent control valve is damaged or has failed
 
EVAP canister is damaged, or hoses are connected incorrectly
 
EVAP control system pressure sensor is damaged or has failed
 
EVAP purge volume control valve is stuck open
 

Trouble Code: P1446



EVAP Canister Vent Valve Malfunction (Closed)

Possible Causes:



Charcoal canister is saturated with fuel or moisture
 
Control system pressure sensor is damaged or has failed
 
Canister vent control valve is damaged or has failed
 
Canister vent control valve rubber tube is blocked/bent
 
Water separator is damaged or has failed
 
PCM has failed
 

Trouble Code: P1447



EVAP Control System Purge Flow Malfunction

Possible Causes:



EVAP canister purge volume control valve stuck closed
 
EVAP canister purge control valve stuck closed
 
EVAP control pressure sensor is damaged or has failed
 
EVAP canister vent control valve is damaged or has failed
 
EVAP rubber tube is blocked, disconnected or bent
 
EVAP canister purge control solenoid is damaged or has failed
 
MAP/BARO switch solenoid vacuum line is blocked or bent
 
EVAP canister is leaking (it may be cracked)
 
EVAP 1-way valve connected improperly or purge port blocked
 

Trouble Code: P1448



EVAP Canister Vent Control Valve Malfunction (Open)

Possible Causes:



EVAP canister vent control valve
 
EVAP control system pressure sensor and circuit
 
Blocked rubber tube to EVAP canister vent control valve
 
Water separator
 
EVAP canister is saturated with water.
 
Vacuum cut valve
 

Trouble Code: P1490



Vacuum Cut Valve Bypass Valve

Possible Causes:



Harness or connectors
 
- The vacuum cut valve bypass valve circuit is open or shorted
 
Vacuum cut valve bypass valve
 

Trouble Code: P1491



Vacuum Cut Valve Bypass Valve

Possible Causes:



Vacuum cut valve bypass valve
 
Vacuum cut valve
 
Bypass hoses for clogging
 
EVAP control system pressure sensor and circuit
 
EVAP canister vent control valve
 
Hose between fuel tank and vacuum cut valve clogged
 
Hose between vacuum cut valve and EVAP canister clogged
 
EVAP canister
 
EVAP purge port of fuel tank for clogging
 

Trouble Code: P1492



EVAP Canister Purge Control Solenoid Circuit Malfunction

Possible Causes:



EVAP canister purge control solenoid control circuit is open
 
EVAP canister purge control solenoid control circuit is shorted
 
EVAP canister purge control solenoid is damaged or has failed
 
PCM has failed
 

Trouble Code: P1493



EVAP Canister Purge Control Solenoid Performance (Open)

Possible Causes:



EVAP canister purge control valve is damaged or has failed
 
EVAP canister purge control solenoid valve is damaged/failed
 
EVAP vacuum hoses are clogged or disconnected
 
EVAP canister vent control valve is damaged or has failed
 
EVAP canister is full of water, or the vapor separator has failed
 
TSB 00-060 (7/00) contains information related to this code
 

Trouble Code: P1605



A/T Diagnosis Communication Line

Possible Causes:



Check harness and connectors:
 
- circuit is open or shorted
 
A/T control unit (TCM)
 
Battery
 

Trouble Code: P1705



Throttle Position Sensor Circuit Malfunction

Possible Causes:



TP sensor signal circuit is open between the sensor and TCM
 
TP sensor signal circuit is shorted between sensor and TCM
 
TP sensor is damaged or has failed
 
TCM has failed
 

Trouble Code: P1706



A/T Park Neutral Position Switch Circuit Malfunction

Possible Causes:



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

Trouble Code: P1760



Overrun Clutch Solenoid Valve Circuit Malfunction

Possible Causes:



Overrun clutch solenoid control circuit is open
 
Overrun clutch solenoid control circuit is shorted to ground
 
Overrun clutch solenoid is damaged or has failed
 
TCM has failed
 

Trouble Code: P1900



Cooling Fan Control Circuit Malfunction

Possible Causes:



Cooling fan control circuit is open or shorted to ground
 
Cooling fan is damaged or has failed
 
Cooling system component failure (i.e., radiator hose, radiator cap, water pump or thermostat may be stuck partially closed
 

 
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