Car is throwing codes... not sure what happened.

[ikonis]

First off, I need to explain what I did before the car began throwing codes.

1) After I got my car back from the body shop, I installed new HID's in the fog lights. Car did not throw codes after the install of these.

2) I installed a cathode tube in the grill, wired to the same relay as the HID's (low beam) to come on with the headlights.

3) I installed some lighting in the car wired to a switch that is wired to the cigarette lighter (fuse 18 set so it's only on with the ignition)

After starting up the car, I am receiving each of these codes:
P0031 HO2S Heater Circuit Low Voltage Bank 1 Sensor 1
P0037 HO2S Heater Circuit Low Voltage Bank 1 Sensor 2
P0051 HO2S Heater Circuit Low Voltage Bank 2 Sensor 1
P0057 HO2S Heater Circuit Low Voltage Bank 2 Sensor 2

I know these have to do with the O2 sensors.
I've checked the connections, so they're not shorting out the ground.
It seems unlikely that all four sensors would go out at the same time, so is it possible one of the three things I did above would cause the codes to be thrown?

We just recently had a good amount of rain, but I haven't driven through anything that would remotely come close to drowning the sensors, especially the upstream ones.

Any ideas?

P.S. Tried clearing the codes with the predator, but that did not work.

[ikonis]

Bump...

Now this is beginning to be a serious issue.

If the car is off for a period of time (say.. an hour), the car seriously surges and basically dies for a moment when starting to drive. After that, it seems to drive fine.

Any and all help would be nice.

[CHARGERTREV]

well its uniform on both sides I can tell you that....its front and back both sides.....


BTW take your tune off and see if it still happens.

[STAGE 3 R/T]

send fnkychkn a PM.

[ikonis]

Disconnected everything I did, except the HID's... even disconnected my NoESP module.

Still throwing codes.

PMing fnky right now.

[ikonis]

Even though it is highly unlikely, I went ahead and purchased 4 new O2 sensors... shop will have them tomorrow morning. Hopefully this will fix everything.

[CHARGERTREV]

Did you take your tune off? Or no....

[ikonis]

Yea, no change.

[obiwan]

I had the same issue on a PCM that was custom tuned by a shop. That PCM would throw codes every time, I installed it in another car, same errors. Installed different PCM, errors were gone.

Could you have grounded a hot wire on accident during your install?

[ikonis]

Checked and rechecked every splice and connection. There was nothing of the sort.

I just remembered something else that happened though:
I was working under the hood just to see exactly how I wanted to fit the cathode into the grill. I had spliced a connector to the ground wire on the cathode inverter and bolted it down to the grounding nut coming out of the fuse box and then the same for the hot wire.

The wife needed to leave for a few minutes so I pulled the cables off and forgot (like an idiot) to tighten the ground nut back down. Wife gets in the car, and tries to start it, there was a grinding noise and it didnt start. I remembered that I forgot to tighten the nut down, so I did that. Car started fine. She gets back about five minutes later and tells me the check engine light was on during her drive.

Pulled the codes and above was what was there. Funny thing, I decided to just rewrite the canned tune to the PCM, and it went away for a short time. Drove around for a few minutes with no MIL. Went into a gas station, came out, started the car, and it was back on.

Every try to get the MIL to go out since has been unsuccessful.



Could my complete idiot action of not tightening down the ground blown the O2 sensors? And if that's not likely, possibly the PCM?

Either way, I should know tomorrow afternoon if new O2 sensors fixed the problem.

[klarmie]

The front O2 sensors share the same ground with each other, and the rear O2 sensors have a shared ground with themselves, but they are not ALL on the same ground

[klarmie]

P0031-O2 SENSOR 1/1 HEATER CIRCUIT LOW




For a complete wiring diagram Refer to Section 8W</B>.

• When Monitored:

• Continuously during O2 heater operation with battery voltage between 10.4 and 15.75 volts.
• Set Condition:</B> The PCM detects that the O2 sensor heater element input is below the minimum acceptable voltage. One trip fault. Three good trips to turn off the MIL.

Possible Causes</B> INTERMITTENT DTC (K99) O2 1/1 HEATER CONTROL CIRCUIT SHORTED TO GROUND (K99) O2 1/1 HEATER CONTROL CIRCUIT OPEN OR HIGH RESISTANCE 1/1 OXYGEN SENSOR POWERTRAIN CONTROL MODULE (PCM)
</B>
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).</B>
Diagnostic Test

1. DTC IS ACTIVE </B>

Start the engine and allow it to idle for at least 60 seconds.

WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in personal injury or death.

With a scan tool, select View DTCs.

Is the status Active for this DTC?
Yes

• Go to 2

No

• Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure.(Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

2. 1/1 OXYGEN SENSOR </B>



Turn the ignition off.

NOTE: Allow the sensor to cool to ambient temperature before continuing. The voltage should stabilize between 4.6 and 5.0 volts.

Disconnect the 1/1 Oxygen Sensor harness connector.
Measure the resistance of the O2 sensor heater element across the 1/1 Oxygen Sensor connector between the heater control terminal and the ground terminal.

NOTE: The resistance of the heater element will vary according to temperature and should be measured at 70° F (21.1° C).


Is the resistance between 2.0 and 30.0 ohms?
Yes

• Go to 3

No

• Replace the 1/1 Oxygen Sensor in accordance with the Service Information.
• Perform the PCM Verification Test.(Refer to 9 - ENGINE - STANDARD PROCEDURE)

3. (K99) O2 1/1 HEATER CONTROL CIRCUIT SHORTED TO GROUND </B>



Turn the ignition off.
Disconnect the Powertrain Control Module (PCM) connector.
Measure the resistance between ground and the (K99) O2 1/1 Heater Control circuit in the 1/1 Oxygen Sensor harness connector.

Is the resistance below 100 ohms?
Yes

• Repair the (K99) O2 1/1 Heater Control circuit for a short to ground.
• Perform the PCM Verification Test.(Refer to 9 - ENGINE - STANDARD PROCEDURE)

No

• Go to 4

4. (K99) O2 1/1 HEATER CONTROL CIRCUIT OPEN OR HIGH RESISTANCE </B>



Turn the ignition off.

CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals, resulting in poor terminal to pin connection. Install Miller Special Tool #8815 to perform diagnosis.

Measure the resistance of the (K99) O2 1/1 Heater Control circuit between the 1/1 Oxygen Sensor harness connector and the appropriate terminal of special tool #8815.

Is the resistance below 0.5 ohms?
Yes

• Go to 5

No

• Repair the (K99) O2 1/1 Heater Control circuit for an open circuit or high resistance.
• Perform the PCM Verification Test.(Refer to 9 - ENGINE - STANDARD PROCEDURE)

5. POWERTRAIN CONTROL MODULE (PCM) </B>

Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the 1/1 Oxygen Sensor and the Powertrain Control Module (PCM).
Look for any chafed, pierced, pinched, or partially broken wires.
Look for broken, bent, pushed out or corroded terminals.
Refer to any Technical Service Bulletins that may apply.

Were any problems found?
Yes

• Repair as necessary.
• Perform the PCM Verification Test.(Refer to 9 - ENGINE - STANDARD PROCEDURE)

No

• Replace and program the Powertrain Control Module (PCM) in accordance with the Service Information.
• Perform the PCM Verification Test.(Refer to 9 - ENGINE - STANDARD PROCEDURE)

[fnkychkn]

PCM grounds at G102.



you may have damaged the PCM trying to start it with a poor PCM ground.

[ikonis]

Thanks fnky...

Ouch, that was what I was afraid of after some rethinking.
Anyone have any idea on how much a stealership would charge to fix?

[fnkychkn]

assuming that the PCM is the cause, a mopar reman will run you approx $700.00 + programming.

of course, they'll have to run a proper diagnosis before they condemn the PCM.