Stuck in Open Loop (Sys Fail) - MR2 Owners Club Message Board
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post #1 of 76 (permalink) Old April 2nd, 2017, 04:24 Thread Starter
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Stuck in Open Loop (Sys Fail)

Went for a spin yesterday to check a few things out and noticed that my Torque Pro was reporting the car was stuck in open loop (system fail).

I know I've got a faulty OBDII adaptor (according to Torque Pro) so is this likely to be the reason or do I actually have something wrong stopping the car going into closed loop?

I've never fully understood what controls it going into open and closed.
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post #2 of 76 (permalink) Old April 2nd, 2017, 10:29
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Closed loop occurs when the O2 sensor is read out and used to adjust the fuel. The ECU will probably also lock out of closed loop if there is any other sensor failure. First check for any fail codes related to sensors. Also, the O2 sensor can malfunction without triggering a specific fault.
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post #3 of 76 (permalink) Old April 2nd, 2017, 18:14
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Quote:
Originally Posted by monkeyra View Post
Went for a spin yesterday to check a few things out and noticed that my Torque Pro was reporting the car was stuck in open loop (system fail).

I know I've got a faulty OBDII adaptor (according to Torque Pro) so is this likely to be the reason or do I actually have something wrong stopping the car going into closed loop?

I've never fully understood what controls it going into open and closed.
With the 2GR, you need the AFR and related sensors working to get into closed loop. It's the same behavior on my 1MZ w/ AFR sensors.

1 AFR sensors
2 ECU coolant temp sensor output
3 AFR sensor ECU grounds (usually 2 grounds, E04+E05, for example)
4 Use a relay and fuse protected line to supply power to AFR sensors as they draw up to 16A (8A x2) on cold days; this will overload EFI fuse if wired through there
5 Make sure the CAN communication bus isn't experiencing any issues (shield wires from EMI and have adequate grounds)

On these new ECUs, close loop is achieved when the AFR sensors are warmed up, which is usually within 10-15 seconds for planar AFRs.
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post #4 of 76 (permalink) Old April 3rd, 2017, 06:08
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Continuation on the discussion we had in another thread, but the 2gr's ECU will report "open loop" if the AFR feedback module does not have 100% authority on the fuel control so it's hard to tell the actual open/closed loop operation when under load.

if you get "closed loop" at idle and no fault codes the system is working fine. are you only seeing "open loop" at idle?
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post #5 of 76 (permalink) Old April 3rd, 2017, 06:32 Thread Starter
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Yesterday I didn't see closed loop at all. I saw it say open loop - low temp when it was warming up. Next time I checked I saw the sys fail and that never went away.

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post #6 of 76 (permalink) Old April 3rd, 2017, 06:37
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do you know that you're still getting PID updates when you get the system failure?
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post #7 of 76 (permalink) Old April 3rd, 2017, 07:16 Thread Starter
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I don't to be honest, I know other pids are updating, but wouldn't know how to check. I'm only using torque pro on Android, would that tell me?

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post #8 of 76 (permalink) Old April 4th, 2017, 22:14
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If the others are working this probably is. but i'd probably try to figure out why you're getting an error before you trust its data.

run the quick check with the voltmeter and see if the bus termination is appropriate.
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post #9 of 76 (permalink) Old April 9th, 2017, 10:03 Thread Starter
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Well I can rule out my adapter. I altered the resistor as per Goukys instructions and the adapter is now showing zero errors. Also got a cheap WiFi and also says sys fail. Ecu codes are only showing power train errors. Suggestions on what to check?

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post #10 of 76 (permalink) Old April 9th, 2017, 10:12
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To rule out an error with the tune i made do you have access to someone else with a normal non immobilized 5 plug you can test?
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post #11 of 76 (permalink) Old April 9th, 2017, 10:35 Thread Starter
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It's a bog standard 5-plug Toyota ecu, hasn't been hacked by you yet Marc.

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post #12 of 76 (permalink) Old April 9th, 2017, 10:39 Thread Starter
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Fault log :


Fault log report generated by Torque for Android
=================================================

Vehicle VIN: Not present
Vehicle Manufacturer: Unknown
Vehicle Calibration ID: 348E6100

Current Fault Log
------------------
P0037: HO2S Heater Control Circuit Low (Bank 1 Sensor 2)
P0453: Evaporative Emission Control System Pressure Sensor High input
P0986: Unknown code - More information may be available on the web
P2716: Pressure Control Solenoid D Electrical

Pending Fault Log
------------------
P0031: HO2S Heater Control Circuit Low (Bank 1 Sensor 1)
P0051: HO2S Heater Control Circuit Low (Bank 2 Sensor 1)
P0057: HO2S Heater Control Circuit Low (Bank 2 Sensor 2)
P0630: VIN Not Programmed or Mismatch - ECM/PCM
P0705: Transmission Range Sensor Circuit Malfunction (PRNDL Input)
P0748: Pressure Control Solenoid "A" Electrical
P0778: Pressure Control Solenoid "B" Electrical
P0983: Unknown code - More information may be available on the web
P2770: Torque Converter Clutch Circuit High

Historic Fault Log
------------------
ECU reports no historic faults
Other discovered fault codes
(possibly pending, current or manufacturer specific)
----------------------------------------------------
ECU reports no other fault codes logged

End of report.

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post #13 of 76 (permalink) Old April 9th, 2017, 12:29
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Ok, the P0630 is probably because you have one of the "new" 2008 highlander ECUs. That means it's the same ECU many others are running without issue. it also means it's the tune that i'm running and i know it can go into closed loop mode. That eliminates some of the possibilities.

None of these fault codes indicate anything odd, is your coolant temp and intake temp reading appropriately over the OBDII?
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post #14 of 76 (permalink) Old April 9th, 2017, 13:18 Thread Starter
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Yeah, they seem sensible. Coolant gets up to 80 and then the revs drop to a lower tickover, albeit it's now idling at 1000rpm rather than the 850 it used to. Air intake was at 40c when I looked the other day, again seems sensible, idling in my garage with ambient air of approx 15c

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post #15 of 76 (permalink) Old April 9th, 2017, 13:38
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what about if you give the ECU a reset by unplugging it for a few minutes. does the issue occur again right away or does it take a few hours or even days?
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post #16 of 76 (permalink) Old April 10th, 2017, 00:07 Thread Starter
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The issue occurs straight away. I unplugged the ecu yesterday to change the Fuse, fired it up to check it and straight away was sys fail.

Faulty sensor somewhere maybe? Could it be the airflow sensor in the intake? I fiddled around with that recently.

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post #17 of 76 (permalink) Old April 10th, 2017, 06:05
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Can you send me a log of the first minute of run time on a cold engine just idling with the following PIDs:
RPM
MAF
IAT
throttle body position
Fuel Trims
Cat temp (i know you don't have cats, but there's internal calculations)
spark advance
coolant temp

Thanks

Last edited by Gouky; April 10th, 2017 at 06:33.
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post #18 of 76 (permalink) Old April 10th, 2017, 08:49
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Quote:
Originally Posted by monkeyra View Post
P0031: HO2S Heater Control Circuit Low (Bank 1 Sensor 1)
P0051: HO2S Heater Control Circuit Low (Bank 2 Sensor 1)
This is a problem is it not? Sensor 1 is the AFR sensor right?


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post #19 of 76 (permalink) Old April 10th, 2017, 09:24
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This is a problem is it not? Sensor 1 is the AFR sensor right?
wow! apparently i was having a pretty dumb moment right there. I just glossed over them assuming they were secondaries. Yes, this is very likely the problem. the heater circuit is necessary to get the O2 sensors up to working temperature.
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post #20 of 76 (permalink) Old April 10th, 2017, 12:44 Thread Starter
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Ahhh, thanks! I'll check my wiring tonight to see if I can spot anything that's changed. Annoyingly I've lost my wiring notes when I moved house. Would it be a fused supply?
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