Error codes driving me crazy......

[PKN]

Looks like re-wrapping my ignition/injector harness did not solve my problems. I am still getting intermittent misfires. Always on cylinders 5-7 and usually only when the engine is warm. I have changed plugs and coil packs and also checked for vacuum leaks. The latest codes are

P1132:
- Value below lower limit value, test conditions are not-completed, fault is currently active and is not causing a DTC light
P2228:
System Off Idle Bank 2 - Value below lower limit value, test conditions are not-completed, fault is currently active and causing a DTC light

Any ideas anyone?

Steve

[Loren]

P1132 Oxygen sensing adaptation

Possible cause of fault

- Incorrect main charge signal

- Fuel pressure too low

- Fuel injector doesn't open completely

- DME control module faulty

P2228 Ambient Air Pressure Sensor - Below Limit

Possible fault cause

- DME control module faulty

The P2228 is pretty odd - if you clear it does it come back?

Were the ignition/injector wires damaged?

Worst case put a PIWIS on it and run full diagnostics.

[PKN]

Hi Loren

P2228 did occur once before but seems to be an aberration as it does not usually come back after reset.

After another couple of hours on it, I discovered that when I disconnect the injector for 6, 5 stopped firing. This might not be surprising if either of the two injector wires are daisy chained but after reconnection cylinder 6 which was hardly firing at all has now started behaving itself with only an occasional error and now cylinder 5 is not firing. At this point it definitely feels like a short somewhere in the injector harness. Any ideas what to try next?

Steve

[deilenberger]

Unwrap the harness working back from the injector until you expose the damaged part.. then fix it.

[PKN]

Don

I already did that. My Misfires are all across one bank (5-8) and at different times, higher misfire rates on individual plugs. Playing with the harness appears to make no difference. I am starting to think it may be a grounding issue, an O2 sensor or a problem with the DME. I have never had to give up on this kind of issue before but I think this is one for a PWIS readout - Durametric just isn't giving me enough data to target the source. It is very frustrating

Steve

[PKN]

After looking at the wiring diagrams the fickle finger of fate pointed at fuse 8 in the E box. Oddly enough, this fuse feeds coils and injectors for 5,6, 8 and 3. In going back to look at my errors almost all of the misfires causing the DTC light were on 5 and 6 and now 8. I removed the fuse (again), replaced it (again) but with significant wiggling and now the errors have gone. I have been disappointed before but it seems likely that this circuit is the culprit. I will put some miles on her tonight to see if the problem stays fixed before ranting here again

Steve