New 2021 Hisun 700 throwing fault codes

[RickinMT]

2021 Hisun Axis 700

I just picked one up brand new at Lowe's last Sunday and I'm trying to carefully go through the break in time and I just noticed to day it's throwing fault codes.

P0113    IAT Circuit High Voltage or Open                     KsDGDM_IAT_ShortHigh                 113         275

P0122    TPS Circuit Low Voltage or Open                    KsDGDM_TPS_ShortLow                                 122         290

P0201    Injector 1 Circuit Malfunction                            KsDGDM_INJ_CYL_A_Fault            201         513

P0351    Cylinder 1 Ignition Coil Malfunction                                KsDGDM_EST_A_Fault                     351         849

P0650    MIL Circuit Malfunction                                      KsDGDM_MIL_Circuit                        650         1616

 

I noticed the codes while riding so it was already warmed up and working normally. Have no clue what all that means.....

Thanks.

[aefron88]

Hey Rick,

It's strange it would throw so many random codes. I know it will throw the first two if you leave the key in the on position with the engine not running for a few minutes, not sure about the rest. Was it still running (seemingly) normally? I wonder if they're old codes.

I would probably start at battery cables, and then on the cables going into the ECU and work my way thru the EFI harness (especially all the sensors) looking for anything loose, corroded, or bent.

I have a post in the coleman forum that explains how to use HUD ECU hacker to see what the ECU sees that may be helpful in tracking down a random issue like this. It will also allow you to see pending codes, clear codes, etc.

[RickinMT]

  On 7/30/2022 at 3:12 AM, aefron88 said:

Hey Rick,

It's strange it would throw so many random codes. I know it will throw the first two if you leave the key in the on position with the engine not running for a few minutes, not sure about the rest. Was it still running (seemingly) normally? I wonder if they're old codes.

I would probably start at battery cables, and then on the cables going into the ECU and work my way thru the EFI harness (especially all the sensors) looking for anything loose, corroded, or bent.

I have a post in the coleman forum that explains how to use HUD ECU hacker to see what the ECU sees that may be helpful in tracking down a random issue like this. It will also allow you to see pending codes, clear codes, etc.

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Thanks. I was hoping you'd see this and reply. I read some of your other posts and you seem to be very knowledgeable on Hisun. During my rebuild on the 2009 700, I squirted silicon grease into the electrical connectors, after cleaning them up with WD40 I think. Would it be good to do the grease on these new fittings, too?

I don't even know what that IAT or MIL thing is. TPS, I understand is Throttle Position Sensor but I haven't a clue where all these sensors are.  I have zero experience with this new stuff. I spent the last 18 months or so rebuilding a 2009 Hisun 700 and it doesn't have this computer stuff. I suppose I'll just go through and look at all the wiring I can get to and re-seat the connections...

Thanks.

[aefron88]

They're pretty much all on/around the throttle body area. IAT is intake air temp it's a shared sensor with the MAPlb the suction side the throttle body.

You can use a small amount of dielectric grease to help seal the connectors, don't need any on the physical connections themselves.

 

Like I mentioned the errors seem to be all over the place which leads me to suspect a weak ground or other shared electrical connection, rather than a specific sensor.

I'm hardly a hisun expert, bit I have a good logical troubeshooting process (rather than throwing parts) and am happy to help where I can. Let me know how it goes and we can try to troubleshoot further.

[RickinMT]

Well the last two days it hasn't thrown any codes at all. I did notice a 351 and one other one I forget, when I leave the key on like you said. Otherwise it seems ok. I still need to go through it with a fine-tooth comb and check all the connections. And the bolts, for that matter.

Thanks, guys!