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By travis - Sunday, April 09, 2006 7:47:00 AM
Ihave a 3.0 diesel Isuzu trooper that cuts out after ten mins of running,also runs rough and will not rev up.
It will start up straight away sometimes but mst times you have to wait a few mins.
By manicmotors - Sunday, April 09, 2006 7:52:36 AM

what year is it?

can you get it scanned for codes

also might be worth while connecting some clear pipe between fuel pump and filter to check for air problems


By travis - Sunday, April 09, 2006 8:05:34 AM
Thanks for the reply .the vehicle is 1998 model.i was thinking of having the ecu checed
By travis - Sunday, April 09, 2006 8:14:25 AM
Hi its travis again do you have a wiring diagram for this engine,no body near to us has a code reader for isuzu vehicles.

cheers travis
By motor-mender - Sunday, April 09, 2006 9:42:58 AM
hi travis

i have done a couple of these lately and they have both been eobd but does not show much data.

one of them i had a problem with was the map sensor and it was blocked full of soot so after a clean out all was good and power was restored.

the socket is loose on a piece of wire tucked under the center consul at the drivers side.

hope this helps and let me know if i can be any more help.

the ones i did were a 1999 and a 2001

By travis - Sunday, April 09, 2006 10:06:41 AM
thanks for the info i will try this tomrrow.
quite agee with you on the plugs and points ,i have been an auto electrican 25 years at bentley motors the job gets harder all the time.
cheers travis
By aidan - Sunday, April 09, 2006 12:51:23 PM

       Is this the one where the injection system needs on oil pressure to work?

      If so I understand from a mate who worked on them at the dealer that the grade of oil used is critical also the engine has a Bad reputation, lots of expensive problems, (cracked heads allowing fuel into cylinder, ECU/ electrical faults ) I  would not however expect oil grade issue it to give your problem. We did have one with slightly similar symptoms that turned out to be ECU fault (£1500) ,  this one went to the dealer due to lack of info and access to code reading.


By travis - Sunday, April 09, 2006 1:04:26 PM
Thanks for the info.
Yes it is the that uses oil pressur for the injectors.
Im begining to think its ECU related have spent alot of time on the vehicle

cheers for now travis
By steven_elliott - Sunday, April 09, 2006 1:12:24 PM
Hi, You need to find someone nearby with a tech 2 with isuzu software as this is the dealer tool,that may help with fault codes and live readings.
By motor-mender - Sunday, April 09, 2006 3:25:16 PM
one of the vehicles i spoke of earlier was one of my trade customers who just came to me as he was sick of looking at the vehicle and finding nothing. i do not have a lot of experiance on these but i know they must run very thin oil eg 5w30 or 0w30 or they will just not start when cold. i did what i could with the data i have but it was still hit and miss when it was cold so i recomended a garage in doncaster who has a tech 2 dealer tool and confesses to be a bit of and expert on all vehicle diagnostics. he said the engine has a electronic oil pump inside the engine and if this fails it causes many problems which are very hard to pin down but the last i heard was the van was still there and that will be about 6 weeks at £50 per hour so glad its not mine or one of my customers.

will let you know when i get to find out the problem if it ever gets found.

if it has the 16 pin socket i think it will be eobd so you should get codes at least


By motor-mender - Sunday, April 09, 2006 3:31:34 PM
here is a list of manufacturer specific codes i found when looking at this van

Isuzu Trouble Codes

P1106MAP Circuit Intermittent Voltage High
P1107MAP Circuit Intermittent Voltage Low
P1108Barometric Pressure Circuit Input High
P1111IAT Sensor Circuit Intermittent Voltage High
P1112IAT Sensor Circuit Intermittent Voltage Low
P1114ECT Sensor Circuit Intermittent Voltage Low
P1115ECT Sensor Circuit Intermittent Voltage High
P1121TP Sensor Circuit Intermittent Voltage High
P1122TP Sensor Circuit Intermittent Voltage Low
P1133H02S Insufficient Switching Bank 1 Sensor 1
P1134H02S Transition Time Ratio Bank 1 Sensor 1
P1153H02S Insufficient Switching Bank 2 Sensor 1
P1154H02S Transition Time Ratio Bank 2 Sensor 1
P1171Fuel System Lean During Acceleration
P1297Electrical Load Detector Circuit Input Low
P1298Electrical Load Detector Circuit Input High
P1300Random Misfire
P1336CKP System Variation Not Learned
P1359CKP/TDC Sensor Disconnected
P1361TDC Sensor Intermittent Interruption
P1362TDC Sensor No Signal
P1380ABS Rough Road System Fault
P1381Cylinder Position Sensor Intermittent Interruption, Misfire Detected (Except 1998 Rodeo)
P1381ABS Rough Road Class 2 Serial Data Fault Or Link Error (1998 Rodeo)
P1382Cylinder Position Sensor No Signal
P1390G Sensor Circuit Intermittent Voltage Low
P1391G Sensor Performance
P1392G Sensor Voltage Low
P1393G Sensor Voltage High
P1394G Sensor Intermittent Voltage High
P1404EGR Valve Stuck Closed
P1406EGR Valve Pintle Position Circuit
P1441EVAP System Flow During Non-Purge
P1442EVAP Vacuum Switch Voltage High During Ignition On
P1459EVAP Emission Purge Flow Switch Malfunction
P1491EGR Valve Lift Insufficient Detected
P1498EGR Valve Lift Sensor Voltage High
P1508IAC System RPM Low
P1509IAC System RPM High
P1546A/C Compressor Clutch Output Circuit Malfunction
P1548A/C Compressor Clutch Output Circuit Malfunction
P1607PCM Internal Circuit Failure ‘‘A’’
P1618SPI Communications Error
P1625PCM Unexpected Reset
P1627PCM A/D Conversion Malfunction
P16355 Volt Reference Voltage Circuit Malfunction
P1640ODM 1 Input Voltage High (Except 1998 Rodeo)
P1640ODM Output ‘‘A’’ Circuit Fault (1998 Rodeo)
P1650Quad Driver Module ‘‘A’’ Fault
P1790Trans ROM Checksum Error
P1792Trans EEPROM Checksum Error
P1835Trans Kickdown Switch Malfunction
P1850Brake Band Apply Solenoid Malfunction
P1860TCC PWM Solenoid Circuit Failure
P1870Transmission Component Slipping
By travis - Monday, April 10, 2006 5:07:03 AM
i have been on to a local company this morning with respect to getting the ecu checked out.
I have checked some of the points that people have raised,still the same but will carry on.
If you have any more ideas please let me know.
When i get this sorted wll let you know for future refferance
By travis - Wednesday, April 12, 2006 11:33:00 AM
The ECU has been sent to BBA to be checked out .Have also done continuity checks on as much wiring as poss ,no open circuits or short circuits as of yet.
cheers for now travis
By KMKexclusive - Wednesday, April 12, 2006 1:32:55 PM
i had mitsubishi diesel van with similiar problem,-it was a rotary pump  seal worn ( pump sucks air in).... 
By travis - Friday, April 28, 2006 3:06:40 PM

With refferance to the Isuzu trooper,the ECU has come back from BBA ,the tests they have done have not come up with any faults.

They suggested the software within the ECU could be at fault.

I think the next stage is to get the vehicle on diagnostics to see what is going on when the vehicle is running,also any fault codes that could give us help

Cheers for now travis

By PT - Friday, April 28, 2006 3:31:50 PM
i had one recently doing the same. it turns out that the injectors are controlled by oil pressure from the engine. if the oil specification is wrong or the oil is old you could get this. Izusu told me they use nothing but 0w30 oil because it causes so much of a problem.

the oil pressure sensor is very difficult to check with out live local Isuzu dealer said that they sell 3 a week of these oil rail/injector controls.

i flushed the engine and renewed the filter and everything was ok.

By andyp - Monday, May 01, 2006 6:55:27 AM
done one of these.wot a pain u really need code read.they do suffer with injectors leaking past seals filling bore with fuel (hydrolic lock) there is some one who can test & repair these in derby do have wiring diagram if need one      dont crank engine when battery low
By travis - Wednesday, May 17, 2006 4:33:02 PM

Still had no luck with the Isuzu Trooper,it runs rough at tick over then after a short period of time it will not rev up ,just ticks over.
I have managed to get some with EOBD code reader had a couple of codes but were of no significance.
The local Isuzu dealer did not want to know,but it turns out to be an inport.
Im wandering if this is going to complecate maters as to reading the fault codes.
We are in congleton in cheshire ,so if any knows of some independant that may be able to help i would be very grateful.

Thanks Travis
By K And R - Wednesday, May 17, 2006 5:28:15 PM

The Carman Scan will  code read thisBigGrin so hope-fully some one in your area has oneWink. Alsothe X431 may but not 100% sureSmile


By aidan - Thursday, May 18, 2006 3:57:03 PM
Hi Travis

             Check you PM may be of help


By Alex-BBA - Friday, May 19, 2006 11:03:14 AM

Kevin is right the carman scan2 reads the Izuzu's but the X431 unfortunatly does not. There is an option to get Izuzu onto the X431 but it is designed for the Thailand market and it would not be much use over here.

Any questions feel free to ask


By travis - Friday, May 19, 2006 2:33:15 PM
thanks to Aidan he gave me a contact in the East Midlands who are indepedant Isuzu specialists.
He advised me to cut the white wire in the multi plug to the injectors and sensors on the engine. this will make the ECU think that there is no problem on the engine.After doing this i took the vehicle for a run which went ok.
If this went ok then the fault will be the oil rail sensor,other wise if the fault remained you are looking at a damaged pickup pipe.
I will order the parts this next week to finish off the job.

Thanks for everyones input

Cheers for now travis
By travis - Wednesday, June 07, 2006 12:10:29 PM
Have fitted parts to vehicle , cleered any fault codes and gave it a good road test. Everthing is ok and the owner is now a happy bunny at long last.

Cheers Travis
By xr250 - Wednesday, January 31, 2007 8:41:27 PM
HI i have just bought a trooper 30 dohc 54000 miles and after reading this I am getting very scared I bought it from auction for towing the truck has a full service history every 6000 miles but when I was driving it home the temp gauge was cold an so where the heaters I  have put this down to a faulty thermostat so one has been ordered I am now concerned that the stat has been taken out to prevent the engine from heating up and causing the same problem ie the oil pressure sensor / oil rail sensor injector control look forward to hearing your comments phil
By chipper - Tuesday, May 22, 2007 5:01:13 PM
Hi I am new to this forum (Hi all), just read this thred and it rings a bell. Got a 1999 trooper which has been a nightmare, its broke down 6 times, last 2 times chucked the contents of the diesel tank through the water system. Its just had a massive warranty claim on it (4th set of injectors, seals, sleaves etc, new head, valves etc, every pipe/seal to do with the water system replaced) this is all to do with a dealer in doncaster f***ing up the common recall on the engine (injectors seals ect.) had to go to a Cotswold dealer to sort it out, after 5 months (yes 5 months) I now have a truck I can use, sort of. The problem I am having now is apart from residual diesel in the water system (knackered 4 rad caps and 1 thermostat gasket, although flushed system 20+ times), is that it will start up ok then when you touch the throttle it will try to stall and the throttle has no response. It will just about idle, but as soon as it gets some heat into the engine it seems to run fine. The throttle body and oil pressure sensor (been coded) have been changed and there is no faults showing (used Tech 2), the only thing I haven't checked/changed is the oil pickup in the sump (was this the problem with your car), I am very close to instead of giving the truck diesel, giving it petrol with a match, hope you or anyone can help, cheers chipper.
By travis - Thursday, May 24, 2007 4:13:20 PM
Hi Chipper,

I was the orrignator of this post. The fault was the oil pressure sensor which when is faulty will only let the engine rev to 2500 the injectors are trimmed at those revs. I changed the sensor and the vehicle ran ok .

Hope this helps Travis