INJECTOR / CANBERRA HELP!

Technical information, definitions, advice, and support for factory ECU remapping, aftermarket systems, and much more.
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davewatson
New Member
Posts: 5
Joined: 21 Jul 2015, 23:19
State: Australian Capital Territory
Model: NL PAJERO / NJ PAJERO RALLIART
Engine: 3.5-Litre 6G74 V6 24V DOHC
Transmission: 4 Speed Straight-Shift Automatic

INJECTOR / CANBERRA HELP!

Post by davewatson » 01 Feb 2016, 16:59

Hi All,

I have a dilemma - I have an NL Pajero running a DOHC 6G74, however with an NL ECU - I went to purchase an Openport 1.3u cable, however its lead time to my door is estimated at 2 weeks.

I have a rough running car; through a number of other symptoms; is now running again - however barely driveable. I need to do an injector actuator test on each of the cylinders to rule out / rule in a faulty injector. Alternatively I need to also read the CEL code (when manually read, indicates injectors, all injectors are returning correct resistance - although another symptom had all the injectors have their wires severed and shorted).

Any help at all would be greatly appreciated - be it a loan of a cable; or help with it.

Cheers,

David

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magna buff
Senior Member
Posts: 1125
Joined: 21 Jul 2006, 22:37
State: Queensland
Model: TP magna
Engine: 2.6-Litre 4G54/Astron II 8V I4
Transmission: 4 Speed Straight-Shift Automatic
Location: Ipswich Qld

Re: INJECTOR / CANBERRA HELP!

Post by magna buff » 01 Feb 2016, 17:44

i dont think we have any active forum members in canberra with a NL pajero
or the cable you require

we have in buckets information and fault cures for the DOHC 6G74 engine

belt skip a tooth
fuel pump pressure to injector line check
could be coil/spark related problems
have you done a compression test on the engine
those injectors are hidden under stuff no way you see if all the injector plugs are clipped in
TM-TP Magna Specialist

davewatson
New Member
Posts: 5
Joined: 21 Jul 2015, 23:19
State: Australian Capital Territory
Model: NL PAJERO / NJ PAJERO RALLIART
Engine: 3.5-Litre 6G74 V6 24V DOHC
Transmission: 4 Speed Straight-Shift Automatic

Re: INJECTOR / CANBERRA HELP!

Post by davewatson » 01 Feb 2016, 18:55

I've had the plenum off to fix the broken cables - injector plugs are all OK and the injectors are returning the correct resistance..

I thought about coil/spark - however when its given me an injector code it has confused me a tad - can't do a compression test without a massive s#itfight either - the plenum covers the rocker covers on the DOHC.. compression **SHOULD** be ok - the engine has only done 20k since a complete rebuild..

Fuel pressure is a possibility; however was hoping to rule out the injectors as a cause first so as not to chase my tail..

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V6 Delica
Member
Posts: 402
Joined: 15 Jun 2011, 17:58
State: Queensland
Model: import Delica V6
Engine: 3.0-Litre 6G72 V6 24V SOHC
Transmission: 4 Speed Straight-Shift Automatic
Location: Hervey Bay

Re: INJECTOR / CANBERRA HELP!

Post by V6 Delica » 09 Feb 2016, 19:51

to my knowledge you cannot run a DOHC engine using a SOHC ECU , although wiring is the same , because the SOHC cam angle sensor is in the wrong place to read the DOHC cam position properly.
I tried it myself some years back and thats what i found.

WytWun
Valued Contributor
Posts: 537
Joined: 09 Apr 2011, 23:22
State: Australian Capital Territory
Model: Mitsubishi Magna TJ AWD
Engine: 3.5-Litre 6G74 V6 24V SOHC

Re: INJECTOR / CANBERRA HELP!

Post by WytWun » 09 Feb 2016, 21:35

V6 Delica wrote:to my knowledge you cannot run a DOHC engine using a SOHC ECU , although wiring is the same , because the SOHC cam angle sensor is in the wrong place to read the DOHC cam position properly.
I tried it myself some years back and thats what i found.
This one was running okay on the NL SOHC ECU, although not being able to control the intake butterflies (long runner vs short runner) was affecting power output. I loaned Dave my OP1.3 cable and when he returned it he told me the final diagnosis was that when the injector cables were shorted it fried one of the injector drivers (only 1 of 6!) in the ECU. He has been able to rewire things to use the NJ DOHC ECU which has resolved his injector problem and also got back the extra performance resulting from the intake butterfly control.

stumagoo
Member
Posts: 52
Joined: 01 Jul 2014, 23:27
State: Western Australia
Model: Mitsubishi pajero
Engine: 3.5-Litre 6G74 V6 24V SOHC
Transmission: 5 Speed Manual

Re: INJECTOR / CANBERRA HELP!

Post by stumagoo » 10 Feb 2016, 23:28

WytWun wrote:
V6 Delica wrote:to my knowledge you cannot run a DOHC engine using a SOHC ECU , although wiring is the same , because the SOHC cam angle sensor is in the wrong place to read the DOHC cam position properly.
I tried it myself some years back and thats what i found.
This one was running okay on the NL SOHC ECU, although not being able to control the intake butterflies (long runner vs short runner) was affecting power output. I loaned Dave my OP1.3 cable and when he returned it he told me the final diagnosis was that when the injector cables were shorted it fried one of the injector drivers (only 1 of 6!) in the ECU. He has been able to rewire things to use the NJ DOHC ECU which has resolved his injector problem and also got back the extra performance resulting from the intake butterfly control.

Thats interesting anouth the NL ECU on the DOHC - a few have asked about it due to the ability to rewrite the NL ECU (mainly due to immobiliser iussues) the butterflies in the intake are sometimes removed anyway due to failure so if one was to remove the butterflies and run the NL ecu it may be viable, I was under the impression V6Delica was correct but if we have someone who has had a running engine then maybe its possible.

User avatar
V6 Delica
Member
Posts: 402
Joined: 15 Jun 2011, 17:58
State: Queensland
Model: import Delica V6
Engine: 3.0-Litre 6G72 V6 24V SOHC
Transmission: 4 Speed Straight-Shift Automatic
Location: Hervey Bay

Re: INJECTOR / CANBERRA HELP!

Post by V6 Delica » 13 Feb 2016, 20:33

if possible its a good idea to try and remove the intake butterflies anyway - the plate securing screws are known to fall out and get ingested by the engine. its the leading cause of failure in the DOHC Pajero and Hyundai Terracan DOHC engines , even as late as 2007.

its been a long time since i played with the DOHC / SOHC ECUs, and i'd like to know if i was correct about the differences in the cam sensor location.

WytWun
Valued Contributor
Posts: 537
Joined: 09 Apr 2011, 23:22
State: Australian Capital Territory
Model: Mitsubishi Magna TJ AWD
Engine: 3.5-Litre 6G74 V6 24V SOHC

Re: INJECTOR / CANBERRA HELP!

Post by WytWun » 14 Feb 2016, 20:49

I doubt the sensor location has any impact - as long as the waveform is correct and in the appropriate time relationship with the CAS signal the ECU won't care.

Think of it this way: when everything is timed up as it would be when changing the cam belt, as long as the sensor and trigger are moved in sync they can be placed any where around the cam gear without affecting the sensor waveform timing in relationship to the CAS.

I know that the engine actually started with the NL ECU - I was present when Dave tested this after I nuked the immobiliser in the ECU for him (thanks to stumagoo for the definition too!). From what Dave told me I believe he'd driven it several thousand kms after then until disaster struck. The major problem with using the NL ECU in the NJs is that re-pinning the ECU connectors (from 3 to 4) is not for the faint hearted... and personal experience with the Magna manual ECU connectors (same type as the NJ & NL ECU connectors) is that unless you have the correct tool, getting some of the pins out can be a major test of patience. :x

stumagoo
Member
Posts: 52
Joined: 01 Jul 2014, 23:27
State: Western Australia
Model: Mitsubishi pajero
Engine: 3.5-Litre 6G74 V6 24V SOHC
Transmission: 5 Speed Manual

Re: INJECTOR / CANBERRA HELP!

Post by stumagoo » 15 Feb 2016, 23:56

No problems WytWun - the reality is a lot of it would not have been possible without the defintions others had done so it was not all me - I just did the pattern matching. I know what you mean about the repinning - I was actually looking at making a patch harness to do it when another was looking into this option. Not sure what that person ended up doing as the emails stopped.

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