Fault codes

[PeterSchurms]

I have a 95 MU Auto. Does anyone have a copy of the diagnostic fault codes.

I would realy appreciate it., Thanx, Pete

[Dave M]

Have you got a code out of it? What is it? The most common code out of those is "TPS out of range". Cheers.

[PeterSchurms]

Code is 2-1 and have seen a 2-4. The codes are given without engine running.

I shorted the pins on the green plug behind the driver side kick panel.
What is the code for 'TPS out of range'? We have tested the TPS and it seems to ramp up and down evenly.

[Dave M]

Hey Peter, shall check your codes at work tomorrow. Is it still going ok? You said you changed the oil and cleaned up some plugs and it went OK. TPS code usually comes when someone has tried to back the sensor off a bit far for earlier upshifts; computer says 'too low'.

[PeterSchurms]

Mine is crusin! I took it for a rough and tough rumble in jungle on the weekend, through big river/Little river, Matlock, Woods point..... Lots of fun! The auto is not 100% but the improvement is still amazing. I am still working on a temperature management problem. I think it is related to the turbo but have not ruled out the auto as a contributer.

Reason for questions is I am helping a mate with a auto change-over taken out of a 3.1 Jackaroo. It has gear change problems, especially over drive. We have swapped a few parts and have not been able to pin point the problem.

I was looking at doing the same in mine thus keeping an eye on his progress. Hopefully the fault codes will help give some direction.

Thanks for your support!

[Dave M]

Hey Peter, code 21 is TPS voltage open circuit or too high (greater than 4.9v). No such thing as 24 apparently. So this is the Jackaroo problem still. I posted some suggestions a while ago; I guess they weren't useful. Once you start transplanting, things don't always use the same computer or something odd happens. Can be a real nightmare sometimes and the inbuilt diagnostics become useless. As for your own, connector cleaning won't do much if there wasn't an electrical problem, but lots of new DX3 smooths things out nicely sometimes. Buying the parts from a specialist would have saved you a big pile of bucks; Repco are huge expensive for anything! Cheers then.

[PeterSchurms]

Dave, your a champion! I'll keep you posted on the results.

Thanks. Pete

[PeterSchurms]

G'day Dave, Are these the correct codes? I found them on the web. Pete
autorepair.about.com/library/ts/obd-i/bl-dtcs-74a.htm
Diagnostic Trouble Codes - 1994 Isuzu
13 Open Oxygen Sensor Circuit
14 Coolant Temperature Sensor (High Temp Indicated)
15 Coolant Temperature Sensor (Low Temp Indicated)
21 Wide Open Throttle Switch Faulty
22 Starter Signal System
23 Power Transistor System
25 Vacuum Switching Valve For Fuel Pressure Control
26 Vacuum Switching Valve For EVAP Canister
27 Vacuum Switching Valve For EVAP Canister
32 EGR system fault
33 Fuel Injection System
34 EGR Temperature Sensor System
35 Power Transistor System
41 Crankshaft Position Sensor System
43 Wide Open Throttle Switch Faulty
44 Fuel Metering System
45 Fuel Metering System
51 Micro-Computer Unit (ECM)
52 Micro-Computer Unit (ECM)
53 Vacuum Switching Valve For Fuel Pressure Control
54 Power Transistor System
61 Mass Air Flow Sensor System
62 Mass Air Flow Sensor System
63 Vehicle Speed Sensor
64 Fuel Injector System
65 Wide Open Throttle Switch Faulty

To extract a trouble from the computer for diagnostic purposes, the Assembly Line Communication Link (ALDL) connector is used.

To activate the Diagnostic mode, a special connector located in the center console is utilized. When the ALDL (assembly line diagnostic link) connector is jumpered between terminals "A" and "C" with the ignition "ON" and the engine not running, the light will flash any stored codes.

[Dave M]

Peter, these are engine codes for a petrol something. Near the three pin plug should be a two pin; jump these for trans codes. The check trans light is flashing? Could find nothing on that link about trans codes; tell me what you have, if anything. How many temp sensors around the thermostat housing; one of them tells the trans ecu when its warm enough for OD and lock-up; there are different sensors for different models. did find this;http://autorepair.about.com/cs/troubleshooting/a/aa072702a_3.htm. Cheers.

[PeterSchurms]

Thanks Dave,
I should have known. Its from a US site and they do not use much desiel and the codes have a real petrol emphasis.

I will be having another look at the problem at the end of the week. I'll keep you posted on the results.

Pete

[richard2]

Auto shifting into O/D ...disconnect bottom sensor on thermostat housing.

[PeterSchurms]

G'day,

We have been able to replicate the problem and we have identified where the problem lies. Dave was right it was TPS related. We did not think this initially as when we tested it, it worked fine on. We also swapped b/w MU's and they both worked great on mine. The problem was the wiring. One of the wires that fed back to the computer was damaged. Who would have known.

Just for my own knowledge, is the following statement correct. 'This sensor tells the auto know when its hot enough to switch into OD. If it fails it may not switch into OD. ' Thanks