D2, V8 non starting event with odd error codes and IACV replacement or repair.

**clubagreenie** · 19th February 2015, 10:36 AM

So yesterday after stopping at shops it decided it wouldn't start. Plenty of turnover, fueling ok, could hear pump priming at ign on and smell unburnt fuel in exhaust.

Initial error codes were p1668, immobiliser/alarm/bcu comms error. With that had the M&S flashing (with the gear led at the shifter flashing in D also). Cleared codes and also ended up deleting the keys and resyncing. During this time (around 40min of trying different settings incl turning the alarm system off (which did nothing for the problem)) it also occasionally just shut down and needed the Nanocom unplugged (to put the BCU back into run mode (with Nanocom comms it's "turned off" from function as you can change things, as also with the SLABS section, that are detrimental to safety when driving)).

Eventually got it to start, and while idling I was checking the ECU status and what the feedback was telling about what was going on. After about 5min idling it just died again.

Another 20min or so after having another random play, got it started again it needed to keep the revs well up and even then could not just hold it at higher revs but needed dynamic revving. Got it home thanks to a skater boy who dropped the bonnet for me so I could keep revving.

Found the following codes:

P0102 - Mass Air Flow Sensor Fault Drive Cycle A
P1000 - Lambda Sensor Upstream Catalyst Bank 2 Drive Cycle C
P0175 - Mixture Adaption Factor FRA Bank 2 Drive Cycle C
P0134 - Lambda Sensor Upstream Catalyst Bank 1 Drive Cycle C
P0505 - Blocked Idle Air Control Valve Drive Cycle A
P1000 - Air Flow to Throttle Angle Cross Check Fault Drive Cycle B

First fault was due to testing post noticing the blocked IACV fault, disconnected the whole inlet tract to check filter and duct for blockages.

Second and fourth faults (lambda sensors) are a persisting fault, purchased new O2 sensors from ebay after looking through preferred suppliers and reviews on here but they cause more issues than they fix. Rough idling when cold and hot stalling.

Third fault, unknown, appeared with this list. Related somehow.

Fifth fault seems to be the root cause of the non starting. I disconnected the bypass hose that runs from before the throttle body through the IACV and re-enters after TB. Disconnected it would start first time and idle flawlessly. What's strange is that there is plenty of suction of bypass air through the IACV and hose (the end normally connected before the T

.

Sixth fault is probably caused by the disconnection of the hose and the imbalance of air flow/mass in relation to the throttle position sensor.

So is it possible there is a fix for the IACV or is it replacement only, in which case does anyone have one spare or wrecking D2V8 in Sydney?

REPLACEMENT ONLY, IN WHICH CASE DOES

**Modelsp** · 19th February 2015, 10:56 AM

give Bundalene a call
0418251793
Probably got 10 spares buried in his backyards in tins,
as ther's no room left in the shed
he's out at Horsley Park
not too far from anywhere really

ashhhhh · 19th February 2015, 11:34 AM

Does the actuator inside actually rotate?
Maybe give it a good clean with some throttle-body cleaner or similar.

If not, replace.

ashhhhh · 19th February 2015, 11:36 AM

Bit odd it started with those random alarm/ecu errors, could be a wiring issue too?
Maybe disconnect and reseat all connectors to the ECU/BCU.

**clubagreenie** · 19th February 2015, 04:59 PM

Got a spare ICV and when plugged it it hums/vibrates over the original which is inert. But will start on either, run with valve inlet open to atmosphere, stall when inlet plugged (as should getting no idle air). Idles smoother on the new unit so will be testing tomorrow. If you don't hear back I'll be stopped on the roadside somewhere.

Thinking the alarm stuff may have been the phantom chemist parking issues that crop up. Tested connections and theres no stray currents or earths where they shouldn't be.

**Pedro_The_Swift** · 20th February 2015, 09:05 AM

Originally Posted by clubagreenie

If you don't hear back I'll be stopped on the roadside somewhere.

Hmmmm...

**lewy** · 20th February 2015, 10:56 AM

Hmmmm... again\still

**clubagreenie** · 20th February 2015, 10:39 PM

OK, got it running. Idles very roughly WITH the ICAV connected as normal (the spare is installed ATM) Swapped back to the original and it now also makes the same noise. Put the spare back on as it came off a running car.

IACV function is when Ign @ run power is sent to the unit and the "valve" which is shaped like a snail shell/scroll moves very slightly to open. When idling, hose disconnected it's actually closed further with a lot of vacuum (only fair since the engine is breathing entirely through it).

Got some new codes.

P0134 O2 sensor bank a - known
P1000 O2 sensor bank b - known

P1553 Idle Air Control Valve fault (closing) Drive cycle A:Signal out of range - above maximum.
P1510 Idle Air Control Valve fault (opening) Drive cycle A:Signal missing.

*** Above may be due to playing with valve with screw driver to check function.

And here's a goody

P1000 (P1129) - Upstream oxygen sensors connected incorrectly (swapped) Drive cycle C:Signal implausible.

P1129 is from a list of codes for the description, displayed on Nanocom as P1000. Oddity as the O2 sensors haven't been touched (yet).

At idle with everything connected idles quite rough, down to 300rpm. At times the revs will jump back to normal (600-680) and be perfectly smooth and then slowly degrade back to rough idle at 600ish and then eventually drop again.

Some figures from the Nanocom at idle. I don't know what they should be "normally".

In instrument mode:

Air Load - 0.00
Idle Air - 1.09
Idle Load Air - 0.09

In Naocom, Motronic, live data.

MAF Sensor - 20
Idle Air - 97 (approx varied +/- 1 or 2)
IACV Drive - 43
Idle Load Air - 0.15
Average Trim Bank A - 0.99
Average Trim Bank B - 0.99
Load Air - 0.00
Fuel Trim A - 1.00
Fuel Trim B - 1.00
Idle Trim A - 0.04
Idle Trim B -0.17
Multi Trim A - 1.00
Multi Trim B - 1.10
Secondary Air - Active
Adaptive Purge - 52.08
Leak Rate - 0.68
Loop - Open
Evap - Active
Roughness - Cyls 1,3,5,7 - varying 0 - 3.6
Roughness - Cyls 2,4,6,8 - 0.00
Timing - (at idle) approx 12deg adv across all cyls. When revved, all cyls are as equal as you'd expect, up to max 36deg.
O2 Sensor A - 0.00 B 0.00
Shunt Voltage - 0.11
O2 Heater Resistance - Ready
Heater Status - on

Downstream O2 Sensor Shunt Voltage - 0.99/4.79 ***value alternates*** also nil downstream O2 sensors.

Upstream O2 Sensor Shunt Voltage - 1.00/4.79 ***value alternates***
Upstream Lambda A output - 1.00/4.79
Upstream Lambda B output - ready
Heater Status - on/off (alternating)

So if anyone knows what these values should be, or has half (or even a full clue) as to whats going on all help appreciated.

**clubagreenie** · 20th February 2015, 10:47 PM

Originally Posted by ashhhhh

Does the actuator inside actually rotate?
Maybe give it a good clean with some throttle-body cleaner or similar.

If not, replace.

Gave it a spray and the original did free up extremely considerably. Made no difference to overall function.

Does anyone know if it's a servo, if so does it operate on PWM, Analogue Voltage Signal or other.

**clubagreenie** · 21st February 2015, 12:46 PM

So swapped the O2 sensors and now have the same two original codes. P0134 & P1000, with their respective description PLUS P0155 & P0135 which are O2 sensor heater faults.

Which says to me that MAYBE I have a wiring fault in the sensor signal circuit & the new O2 sensors have faulty heater circuits.

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