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Thread: AE102 corolla diagnostic how to?

  1. #1
    Junior Member Grease Monkey
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    Default AE102 corolla diagnostic how to?

    Hi there,

    I don't have any available repair manuals at the moment and the engine light has been on the car (I believe it's an engine light? It looks more like a gearbox to me but anyhoo), could anybody run through with me how I would be able to get the fault codes with the car? Is there are DIY way or do I need some sort of equipment?

    I'd go out and buy the Gregory's it's just that I need to get this problem fixed this weekend for work.

    It still runs normally so I'm hoping it's just the o2 sensor or something that's gone... could any point me in the right direction?

    I have a lot of tools available besides fancy equipment, it's just that when it comes to electricals I get sort of confused.

    Much appreciated.

  2. #2
    Junior Member Grease Monkey
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    Default Re: AE102 corolla diagnostic how to?

    PS. I've tried doing a search but to no avail. If anyone can point me to any useful links then that'd be appreciated!

  3. #3
    Toymods Board Member Conversion King Hiro's Avatar
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    Default Re: AE102 corolla diagnostic how to?

    To get the fault codes you turn the car off, pop the bonnet and find the diagnostics terminal in the engine-bay - it'll be a little black box about the size of a box of playing cards, near the passenger-side strut tower, with the words DIAG printed on the top. Pop it open and use a paperclip to bridge the TE1 and E1 terminals (there is a pin layout diagram under the cap). This locks the ignition advance (for setting timing) and puts the ECU into diagnostics mode, which will then display fault codes through the CEL (check engine light) once you start the engine. Normal operation is indicated by a steady single flash every half second or so, if something is wrong you'll get a two-digit code flash up - short burst of flashes representing the first digit, then a small pause, then a second burst of flashes for the second digit, then a longer pause, and then it either repeats (if you only have one code stores) or moves onto the next code if you have multiple problems.

    Standard codes are as follows (or similar, I'll post up the actual 7AFE ones from the Gregorys when I get home from work):
    11 - Loss of power supply to ECU
    - Ignition switch/circuit
    - Main relay/circuit
    - ECU

    12 - RPM Signal. No G or NE signal present for 2 seconds during cranking
    - Open G circuit.
    - Open, short in G or NE circuit.
    - Distributor
    - ECU

    13 - RPM signal. No NE signal for 50msec at 1000rpm.
    - Same as Above

    14 - Ignition. No IGF signal to ECU for 4 consecutive IGT signal during engine running
    - Open/short in IGF/IGT signal from igniter to ECU
    - Igniter malfunction
    - ECU

    21 - O2 sensor. Open/short in heater circuit of oxygen sensor for 0.5 seconds
    - Amplitude of O2 sensor reduced to 0.35-0.70V continuously for more than 60 seconds
    - O2 sensor
    - Vacuum sensor
    - ECU

    22 - H2O temperature sensor. No signal at THW
    - Water temperature sensor
    - ECU

    24 - Intake Air Temp sensor. No signal at THA
    - Intake air temp sensor
    - ECU

    25 - A/F Lean. O2 sensor output in less than 0.45 volts for at least 90 seconds when O2 sensor is warmed and 1500 rpm or above.
    - Open injector circuit
    - Lack of fuel pressure
    - Ignition system
    - Vacuum sensor
    - O2 sensor
    - ECU

    26 - Air/fuel ratio rich indicator
    - Same as above
    - Cold start injector

    27 - Sub-oxygen sensor circuit or sub-oxygen sensor heater circuit
    - Sub oxygen sensor/heater/circuit
    - ECU

    28 - No.2 oxygen sensor/Oxygen sensor heater
    - Same as code 21

    31 - Vacuum sensor. No signal at Vacuum sensor (PIM)
    - Vacuum sensor/circuit
    - Airflow meter/circuit
    - ECU

    32 - Airflow meter signal (Vane-type)
    - Airflow meter/circuit
    - ECU

    33 - ISCV (Idle speed control valve). Open or short in ISCV circuit
    - ISCV Valve

    34 - Turbocharger pressure - abnormal turbocharger pressure (*could apply to the supercharger as well)
    - Turbo charger
    - Airflow meter/manifold/turbocharger pressure sensor
    - Intercooler System
    - ECU

    35 - Turbocharger pressure sensor signal (*could apply to the supercharger as well)
    - Turbocharger pressure sensor
    - ECU

    41 - Throttle Position sensor. No signal for 0.5 seconds or more at ignition ON. (VTA)
    - TPS Sensor/circuit
    - ECU

    42 - Vehicle Speed Sensor. No speed sensor signal to ECU when loaded driving condition with engine speeds 2000 to 5000 RPM for 8 seconds or more.
    - VSS
    - ECU

    43 - Starter. No starter signal to ECU when cranking in TEST mode. Terminal STA on ECU
    - Starter signal circuit
    - Starter relay
    - Ignition switch

    51 - Switch condition signal. Displayed when A/C is on, TPS is off (foot on accelerator etc) or auto trans not in neutral when TE1 and E1 connected in test mode .
    - A/C switch/circuit
    - A/C Amplifier
    - TPS/Circuit
    - Neutral start switch/circuit
    - Accelerator pedal/cable
    - ECU

    52 - #1 Knock sensor. No KNK1 signal to ECU
    - Knock sensor (looseness)
    - Malfunctioning knock sensor

    53 - #2 Knock sensor. No KNK2 signal to ECU or no knock signal in ECU
    - Same as above
    - ECU

    71 - EGR valve malfunction - exhaust gas temp below spec. for EGR control
    - EGR system
    - EGR gas temp sensor/circuit

    72 - Air conditioner compressor relay/relay signal
    - A/C compressor relay/circuit
    - ECU
    AE102 - Charlene the Old Faithful, 71.7kw atw, amassing awesome JDM options
    JZZ30 - Lexi the Spacecruiser, 1JZGTE>>3SGE. 200rwkw, hunting Skylines and n00bs in SS Commodores
    ST162 - Charlie the non-ghey Celica, 3SGE>>4AGE. GOOOOOOOONE
    AE82 - Rosie the Bitsa from Hell, 70.8kw atw. Has been converted into garage space and money at last
    KE55 - Billie the Beast, sadly missed

  4. #4
    Junior Member Grease Monkey
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    Default Re: AE102 corolla diagnostic how to?

    Thanks a lot! Really appreciate the help!

    I'll be printing that and bringing it to the car!

  5. #5
    Your mum is a Conversion King TERRA Operative's Avatar
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    Default Re: AE102 corolla diagnostic how to?

    Let us know how you go.
    Sorry guys, I'm living in Japan so I can't do ECU repairs for the time being.
    Tereno Empireo Rapidmova Reakcii Armeo
    Check out my Youtube channel!


  6. #6
    Junior Member Grease Monkey
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    Default Re: AE102 corolla diagnostic how to?

    Hey guys,

    I've done the dianostic and it appears that's it flashing 21. If Hiro's post on signals is relevant to AE102's, then I was right! It's the o2 sensor.

    Could someone please confirm for me?

  7. #7
    Toymods Board Member Conversion King Hiro's Avatar
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    Default Re: AE102 corolla diagnostic how to?

    Yep, 21 is O2 sensor for the 7As according to the manual.
    AE102 - Charlene the Old Faithful, 71.7kw atw, amassing awesome JDM options
    JZZ30 - Lexi the Spacecruiser, 1JZGTE>>3SGE. 200rwkw, hunting Skylines and n00bs in SS Commodores
    ST162 - Charlie the non-ghey Celica, 3SGE>>4AGE. GOOOOOOOONE
    AE82 - Rosie the Bitsa from Hell, 70.8kw atw. Has been converted into garage space and money at last
    KE55 - Billie the Beast, sadly missed

  8. #8
    Junior Member Grease Monkey
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    Default Re: AE102 corolla diagnostic how to?

    Okay cool!

    I'll have a friend get a second hand one for me at his work place!

    Thanks a lot guys.

    Didn't expect to get a timely response from the forums.

    Thanks again!

    The procedure for the test was so easy!

  9. #9
    Your mum is a Conversion King TERRA Operative's Avatar
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    Default Re: AE102 corolla diagnostic how to?

    Testing the O2 sensor is easy, worth doing to the new sensor before you install it (and maybe the old one to make sure it's not the wiring that's the problem etc).

    http://mr2.com/TEXT/O2_Sensor.html

    Look at the section 'Testing O2 sensors on the workbench.' right down the bottom of the page.
    Sorry guys, I'm living in Japan so I can't do ECU repairs for the time being.
    Tereno Empireo Rapidmova Reakcii Armeo
    Check out my Youtube channel!


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