I was out today after getting my Max back on the road yesterday after almost 5 months and.....I got the check engine light. Did an 80 mile run last night in it just to run it, when I picked it up yesterday it had about 1/8 of a tank left of gas. Filled it with Sunoco 94.

First I got the code 9-3, which is "EVAP canister vent control valve"
Then 3-4, which is the "knock sensor"
Then 7-5, which is "EVAP Control system"

The car has been sitting for almost 5 months, yesterday was its first day out. Today the light came on. Its seems to be running 100%.....is this something to worry about immediately...anyone have any idea what this will run me to get fixed (or is it a do-it-yourseler??)

BTW...thanks for the guide on how to decode the codes and how to get them.....this place is better everyday!!!
thanks
F5

 

If I remember correctly, the Knock Sensor does not need to be replaced urgently, however it will deprive you of some power (20+hp) until you fix it. The EVAP sensor I don't know enough about to brief you so I suggest you call the Nissan dealer.
-Cyrus

 

Thanks Cyrus, it looks like I am going to bring it in next week and see whats going on with it.

F5

 

You should have included the yr of your car in your thread but I see it in your sig. You need to take you car to the dealer because that evap control system on the 96's have a recall on them. Take it to your dealer he should change it free of charge.

 

DTC 0903

Diagnostic Trouble Code 0903 points to a problem with the EVAP Canister Vent Control Valve.
EVAP = EVAPorative emissions control system. This is the system which seeks to minimize air pollution which results from evaporation (as opposed to incomplete combustion) of gasoline.

The EVAP CVCV is located on the EVAP canister (underneath the vehicle near the left rear tire) and is used to
seal the canister vent. It has one hose connection and one two-wire electrical connector. The solenoid in the
EVAP CVCV responds to signals from the ECM. When the ECM sends an ON signal, the coil in the solenoid valve is
energized. A plunger then moves to seal the canister vent. The ability to seal the vent is a necessary part of
the diagnosis algorithms for other evaporative loss system components. This solenoid valve is used only for
diagnosis, and usually remains open. When the vent is closed, under normal purge conditions, the evaporative
loss system is depressurized allowing "EVAP Control System (Small Leak)" diagnosis. Since this part is used only
for brief emissions tests the vehicle will usually start and run well despite a Service Engine Soon warning light on
the dashboard.

The EVAP CVCV may be bench tested. Remove it from the vehicle (one hose, one connector, two bolts). Verify
that air may pass freely through the valve. Then use a pair of fused test leads to apply 12 volts to the terminals
to energize the solenoid. Verify that air does not pass freely through the valve. If the CVCV fails these tests, try
cleaning it with WD-40 and compressed air. If this fails to free it up, replace the valve. When you install a CVCV
(the original or a replacement) always use a new O-ring.


DTC 0705

Diagnostic Trouble Code 0705 points to a problem with the Evaporative Emission Control System.

This malfunction is detected when the EVAP control system has a leak or the EVAP control system does not
operate properly. (EVAP = EVAPorative emissions.) Possible causes include...
- incorrect fuel tank vacuum relief valve
- incorrect fuel filler cap
- fuel filler cap vent remains open or fails to close
- foreign matter caught in fuel filler cap
- a leak in the line between the intake manifold and the
EVAP Canister Vacuum Control Valve
- foreign matter caught in the EVAP CVCV
- leaks in the EVAP canister or fuel tank
- leaks in the EVAP purge line (pipe and rubber tube)
- EVAP purge line rubber tube bent
- blocked or bent rubber tube to EVAP control system pressure sensor
- loose or disconnected rubber tube
- EVAP CVCV and circuit
- EVAP Canister Purge Volume Control Solenoid Valve and circuit
- absolute pressure sensor
- tank fuel temperature sensor
- MAP/BARO switch solenoid valve and circuit
- blocked or bent rubber tube to MAP/BARO switch solenoid valve
- O-ring of EVAP CVCV is missing or damaged
- water separator
- EVAP canister saturated with water
- EVAP control system pressure sensor
- refueling EVAP vapor cut valve
- ORVR system leaks

This is a "jackpot" code. It points to so many possible causes as to be almost useless. It may be accompanied
by another DTC which is more specific.

 

Hey thanks for the breakdown Jay. The whole 20 page essay explaining the process was really informative but if you do a search you'll see that the whole Evap system has a recall on it. If he clears the codes, which I hope he hasnt yet, or opens up the evap control he might not be able to get it dealer serviced for free. Dealers will do anything they can to NOT have to fix something under warranty or recall.

 

Thanks for all the info.....I will bring it into the dealer to see whats up with it.

Would the dealer still replace it even though its on a '96 with 96K miles on it?? Would anyone happen to have a recall notice # or some sort of code for the bulletin??

thanks again guys!!
F5

 

I just got my starter replaced......plus got the fuel injection system cleaned out....what a difference. Now it goes in next week to hopefully get these codes done.

F5