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Diagnostic help needed.


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Had a whack of codes in my 1997 Boxter pointing to Varia cam problem.

Changed Varia Cam solenoid bank 1 and resealed cam cover in car.

Car runs better, however when I checked for codes after a short drive I got

P1319-misfire emmision relevant

P1313-misfire cylinder 1 emission relevant

P1314-misfire cylinder 2 emission relevant

P1315-misfire cylinder 3 emission relevant

P0341- camshaft position sensor 1

CEL light not on, but may be I did not drive it far enough (car not licensed yet)

Car idles rougher as it warms up. I did not change sparkplugs yet as I wanted to solve Varia Cam problem first.

Before changing Varia Cam solenoid I have switched Camshaft position sensors from Bank 1 to 2 and still have PO341. I have ohmed out wiring for Camshaft sensor to ecm and it is ok.

I cleared codes and ran again and now have all the same codes but PO130 has come up...o2 sensor ahead of cat.

After changing variacam is there a reset procedure? Other than clearing codes or disconnecting battery?

Wiring for Varia Cam solenoid was checked to ecm before I bought new solenoid.

Could all these problems be the o2 sensor? Need input as I am stumped>>>

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P1313 Misfire, Cylinder 1, Emission Relevant

P1314 Misfire, Cylinder 2, Emission Relevant

P1315 Misfire, Cylinder 3, Emission Relevant

P1319 Misfire, Emission Relevant

Potential causes:

- Fouled, faulty or incorrect

- Contact resistance

- Loose contacts

Check you coil packs and electrical connectors on them.

P0341 Camshaft Position Sensor 1 - Signal Implausible, Short to Ground, Short to B+

Potential causes:

- No power supply.

- Short circuit to B+.

- Short circuit to ground.

- CMP sensor faulty

Best check the wiring again.

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Thanks Loren,

When I re-installed the coils after doing the Varia Cam they did not seem to snap onto the spark plugs..

Plugs are not fouled, but may be incorrect..I will check again.

I inadventantly got the wiring for coil #3 caught in the cover and had to repair the harness after installing cam cover. But is is soldered and heat shrunk.

For PO341 I have checked the wiring as per my Bentley manual

It is called Hall sensor #1 in Bentley.

Re/VI on plug ohmed ok to pin 53 of ecm. (5v supply)

Re/GR on plug ohmed ok to pin 21 of ecm. (hall sensor signal)

Br/PK on plug ohmed ok to pin 34 of ecm. (ground sensors)

I did not ohm any of the pins to ground.... what is B+?

Is CMP sensor the Camshaft Position Sensor?

Thanks..

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I did not ohm any of the pins to ground.... what is B+?

Should be +5 VDC between pin 1 and pin 3.

Is CMP sensor the Camshaft Position Sensor?

Yes.

The signal from CMP sensor 1 identifies the first cylinder. If both the crankshaft position (reference mark) signal and the CMP sensor signal coincide, this signifies the ignition timing for cylinder 1. The recognition of cylinder 1 is necessary for the purpose of sequential fuel injection and knock sensing.

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I checked Pins 1-3 wih key on and sensor unplugged it has 4.98v.

Sensor was swapped from left bank a few weeks ago. I believe it is good as no error code on left side...

Also checked pin 2 to ground and it is open...what's next?

Pulled 1-3 plugs and they are now fouled. Checked coil extentions that pull off coils and no continuity on them.

Plugs are bosch FR6?...I thought they should be FR7?

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Ok will check.

What about CMP?

P0341 Camshaft Position Sensor 1 - Signal Implausible, Short to Ground, Short to B+

Potential causes:

- No power supply.---------------got power

- Short circuit to B+.-------------no short detected

- Short circuit to ground.-------- no short to ground

- CMP sensor faulty

I guess CMP is faulty? Even though I switched it from left bank and it was not causing error codes on left side?

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Clear your fault codes and report back the new fault codes.

Ok, I ordered new plugs and 3 new coils from Sunset. Changed bank 1 plugs and installed new coils.

Cleared codes. Drove car about 3-4 miles. No CEL light on. Checked codes with my code reader... Had PO341 only. Cleared codes...

Put license on off my other car and drove about 15-20 miles up to 120km per hour.

Car has way more power...

No CEL light, but checked codes anyway. Still have

P0341 Camshaft Position Sensor 1 - Signal Implausible, Short to Ground, Short to B+

P1313 Misfire, Cylinder 1, Emission Relevant

P1314 Misfire, Cylinder 2, Emission Relevant

P1315 Misfire, Cylinder 3, Emission Relevant

P1319 Misfire, Emission Relevant

Wiring checks out ok, have 4.98v at pin 1-3 on Camshaft sensor plug. Center wire is not shorted to ground.

Camshaft Sensor is swapped from left bank and thought to be good.

Varia Cam appears to be working as I can feel it at about 5200rpm (feels like a 4 barrel carb opening)

Could the magnet for sensor have fallen off the camshaft? Or lost it's magnetism? Now I am really guessing...

Idle is a bit rough, but better than before.

If I did not have an OBD II reader I would assume all is well as no CEL light on...

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