GTRBlkMax97

iTrader: (1)

Anyone want to let me know how to read them? Is there a web site with them written up? Please help.

Daniel B. Martin

You will find instructions to do a DTC readout and reset
the Check Engine light at:
http://vbxmaxima.8m.com/ecu.html

The DTC "translations" are found at:
http://vbxmaxima.8m.com/ecudecoder.html

GTRBlkMax97

iTrader: (1)

Thanks again Daniel B.

GTRBlkMax97

iTrader: (1)

OK Daniel can you help me out one more time, the codes I got were for the front o2 sensor (0303)(I know what that is) however I don't know what the Knock Sensor (0304) is or the Closed Loop Control (0308) are can you tell me what those are and how to get them fixed, or how much they might be
thanks in advance

Daniel B. Martin

Diagnostic Trouble Code 0304 points to a problem with the Knock Sensor. The KS is attached to the cylinder block. It senses engine knocking using a piezoelectric element. A knocking vibration from the cylinder block is senses as vibrational pressure. This pressure is converted into a voltage signal and sent to the Engine Control Module (The computer).

This malfunction is detected when an excessively high or low voltage from the KS is entered to the ECM. Possible causes include...
- the harness or connector (The KS circuit is open or shorted).
- the KS

The KS may be checked with an ohmmeter.

1) Raise the hood. View the engine from the driver's fender. Look into
the deep valley between the cylinder banks and below the intake manifold.
Identify the KS as a black item fastened to the block by a single vertical
bolt. A wire harness wrapped in black leads toward you, out of the valley.
That is the KS sub-harness.

2) Follow the KS sub-harness to it's nearest connector. This is connector F121.
It is located near the upper right-hand corner of the valve cover of the forward cylinder bank, as viewed from the front of the car.

3) Disconnect F121. You have to do a "press the latch and wiggle and
pull" to disconnect it. F121 has only two pins; if you see more than two
pins, you have the wrong connector. Use a digital ohmmeter capable of
measuring more than 10 Megohms. You want to measure the pins of F121, not
the sockets of the matching connector. Measure the resistance between a
good ground (such as the battery negative terminal) and pin #2 of connector
F121. On my car this is the highest of the two pins, the one closest to
the front of the car. The factory spec is 500 - 620 Kohms.

The manual says you have to remove the intake manifold to replace the KS. However, I think that a person with good dexterity and a 10mm ratcheting box wrench could replace the KS without disturbing the manifold.

Important note: the dealer can do a more thorough test with his CONSULT electronic tester. The resistance test described here is a useful but limited test. A Knock Sensor which fails this test is definitely bad. However, a KS which passes this test is not guaranteed to be good.

Daniel B. Martin

Diagnostic Trouble Code 0308 points to a problem with the Engine Control Module Closed Loop Logic for the Right Bank. The right cylinder bank is also called the rear bank. It is cylinders 1,3,5.

DTC 0308 is detected when the closed loop control function for the right bank does not operate even when the vehicle conditions meet the criteria (engine at normal operating temperature, etc.). Possible causes include ...
- Harness or connectors (The sensor circuit is open or shorted.)
- a defective Front Heated Oxygen Sensor sensing element.
- a defective Front Heated Oxygen Sensor heater.

Daniel B. Martin

Your previous posts in this thread gave specific Diagnostic Trouble Codes (that's good) but very little other information (that's bad).

What is the odometer reading?
What symptoms do you experience, other than that nasty Check Engine Light?
Has the car been maintained "by the book"?
What is the recent repair history?
Does the engine start readily? Idle smoothly? Run normally?
Is the fuel consumption reasonable?
Is there any noticeable color to the exhaust smoke after the first five minutes of run time?

GTRBlkMax97

iTrader: (1)

58,000 miles
the o2 sensor is not in the front left of the y-pipe because the threads are stripped from trying to put it in the y-pipe, if I get that replaced will it fix the closed loop control?
maintained by the book- more than likely, just got it a few months ago,
no repairs don't since I got it 4 or 5 months ago
engine idles fine but ever since that o2 sensor is out the car is slow as you know what
fuel consumption is getting up there i think
no difference in color of exhaust
let me know thanks, I am off to get an o2 sensor right now though

Daniel B. Martin

If you don't replace it the Check Engine Light won't go away.

If you do replace it, then "maybe". There might be other problems.