d2ndkemper

I checked my code for the check engine light using the instructions found on the how to. Thanks guys! The code is 0302 EGR System Hi/Low Flow. Now what? Do I need to replace the EGR valve or is it a sensor that is bad? BTW '96 maxima with 167,000. I love it!

Kevlo911

iTrader: (36)

0302
Diagnostic Trouble code 0302 points to a problem with the Exhaust Gas Recirculation system. The malfunction is detected by the Engine Control Module when no EGR flow is detected under conditions which call for EGR. Possible causes include:
- The electrical harness or connectors (valve circuit open or shorted)
- The EGR valve is stuck closed
- Weak or dead battery
- The EGR passage is clogged
- Faulty EGR temperature sensor circuit
- A leak somewhere in the exhaust system

The EGR Volume Control Valve may be tested with an ohmmeter. Disconnect the electrical connector. Looking at the connector half which is attached to the EGRVCV with the latch at the 12 o'clock position you will see two rows of three terminals. The top row is numbered 1-3, right to left. The bottom row is numbered 4-6, right to left. Measure the resistance between these terminal pairs:
2 1
2 3
5 4
5 6
... all resistance values should be 20.9-23.1 ohms at 68 degrees F.

Reconnect the EGRVCV connector halves. Turn the ignition switch ON OFF repeatedly. Verify that the EGRVCV shaft moves smoothly forward backward according to the ignition switch position.

The Exhaust Gas Temperature Sensor may be tested with an ohmmeter. The specifications are ...
- at 32 degrees F, 0.68-1.11 Megohms
- at 122 degrees F, 0.09-0.12 Megohms
- at 212 degrees F, 0.017-0.024 Megohms

krismax

iTrader: (15)

I nwill tell you one thing i had the same code and terrible driveability , so i cleaned my big egr tube and replaced my small egr tube .Everything was fixed instantly when car was started.

d2ndkemper

Thanks guys for your responses. The previous owner of the car had just replaced the battery. I reset the code yesterday and it hasn't come back yet. Maybe that was it. However, I am sure that it needs a lot of cleaning done like the IAC valve, Throttle body, and the exause gas tubes. I will clean those too. Thanks again for your help.

stephenlc

iTrader: (1)

Make sure everything is tight and that the gaskets are smooth and flat against the flanges.