Diagnostic Tools Cant Conect To My 2000 Avensis Any Ideas

[frankieboyuk]

ive got a 2000 avensis that has started mis-firing but no fault lights come on tried my cheap scanner and it come up cant connect so I tried taking it to a garage and the snap on diagnostic tool come up unable to connect aswell has anybody come across a fault like this before?

[RichardM95]

The MK1 Avensis uses OBD1, unlike most cars produced since 1996 which use OBD2, could that be something to do with it? I forget the exact procedure for reading the fault codes but two of the pins on the OBD socket must be shorted using a piece of wire and the dash warning lights will flash to represent fault codes stored in the computer. Hopefully someone else will chime in with it!

[fastbob72]

I've no idea why the snap on tool at the garage won't connect but the cheap ones you buy (at Halfords,for example) are basically a fancy looking plastic box that conects to the diagnostic socket and bridges two contacts,exactly the same as when we do it with a piece of wire.lol.Perhaps the tool isn't working properly.

To do it yourself all you need to do it bridge contact E1 and TE1 and switch on the ignition.If there's no fault registered on the ECU then the management light will flash repeatedly twice a second.

If there is a fault it'll flash up the code,see below.It'll flash the tens first i,e it'll flash one or several times at 0.5 second intervals then pause for 1.5-2 seconds then flash a number of times at 0.5 second intervals again to denote the single number.For example if it flashes then 0.5 sec later flashes again pauses for 1.5 seconds then flashes 8 times at 0.5 second between eacg flash that means 2 times 10 and 8 singles or in other words code 28.

The thing is though if the misfire hasn't triggered the management light to come on then there's very likely to be a fault code stored on the ECU.Try changing your HT leads,spark plugs,air filter etc.9 times out of 10 a misfire is caused by something simple,usually in the ignition system.

Anyway,here's the list of fault codes for an EOBD 1 compliant Avensis ~

OBD1 Codes 1 Normal Condition. 2 Air Flow Meter signal. 3 Ignition signal. 4 Engine Coolant Temperature Sensor signal. 5 Oxygen Sensor. 6 RPM signal (Crank Angle Pulse). 7 Throttle Position Sensor signal. 8 Intake Air Temperature Sensor signal. 9 Vehicle Speed Sensor signal. 10 Starter signal. 11 Switch signal. 11 ECU/ECM. 12 Knock Control Sensor signal. 12 RPM signal. 13 Knock Control CPU (ECM). 13 RPM signal. 14 Turbocharger Pressure. 14 Ignition signal. 21 Oxygen Sensor. 22 Engine Coolant Temperature Sensor signal. 23 Intake Air Temperature Sensor signal. 24 Intake Air Temperature Sensor signal. 25 Air-Fuel Ratio Lean. 26 Air-Fuel Ratio Rich. 27 Sub Oxygen Sensor signal. 28 No. 2 Oxygen Sensor signal. 31 Air Flow Meter signal (Vacuum Sensor signal). 32 Air Flow Meter signal. 34 Turbocharger Pressure signal. 35 Turbocharger Pressure Sensor signal. 35 HAC Sensor signal. 41 Throttle Position Sensor signal. 42 Vehicle Speed Sensor signal. 43 Starter signal. 51 Switch signal. 52 Knock Sensor signal. 53 Knock Sensor signal. 54 Inter-cooler ECM signal. 71 EGR System. 72 Fuel Cut Solenoid signal. 78 Fuel Pump Control signal. 81 TCM Communication.

83

TCM Communication. 84 TCM Communication. 85 TCM Communication.

Here's an OBDII list ~

OBD II P0100 Mass Air Flow Circuit. P0101 Mass Air Flow Circuit Range/Performance. P0105 Manifold Absolute Pressure Circuit. P0106 MAP/BARO Circuit Range/Performance. P0110 Intake Air Temperature Circuit. P0115 Engine Coolant Temperature Circuit. P0116 Engine Coolant Temperature Range/Performance. P0120 Throttle Pedal Sensor Switch "A" Circuit. P0121 Throttle Pedal Sensor Switch "A" Circuit Range/Performance. P0125 Insufficient Coolant Temperature for Closed Loop Fuel Control. P0130 Heated Oxygen Sensor Circuit - Bank 1 Sensor 1. P0133 Heated Oxygen Sensor Circuit Slow Response Bank 1 Sensor 1. P0135 Heated Oxygen Sensor Circuit - Bank 1 Sensor 1. P0136 Heated Oxygen Sensor Circuit - Bank 1 Sensor 2. P0141 Heated Oxygen Sensor Circuit - Bank 1 Sensor 2. P0150 Heated Oxygen Sensor Circuit - Bank 2 Sensor 1. P0153 Heated Oxygen Sensor Circuit Slow Response Bank 2 Sensor 1. P0155 Heated Oxygen Sensor Circuit - Bank 2 Sensor 1. P0156 Heated Oxygen Sensor Circuit - Bank 2 Sensor 2. P0161 Heated Oxygen Sensor Circuit - Bank 2 Sensor 2. P0170 Fuel Trim malfunction. P0171 System too Lean. P0172 System too Rich. P0201 Injector Circuit - Cyl. 1. P0202 Injector Circuit - Cyl. 2. P0203 Injector Circuit - Cyl. 3. P0204 Injector Circuit - Cyl. 4. P0205 Injector Circuit - Cyl. 5. P0206 Injector Circuit - Cyl. 6. P0300 Random Misfire. P0301 Misfire Detected - Cyl. 1. P0302 Misfire Detected - Cyl. 2. P0303 Misfire Detected - Cyl. 3. P0304 Misfire Detected - Cyl. 4. P0305 Misfire Detected - Cyl. 5. P0306 Misfire Detected - Cyl. 6. P0325 Knock Sensor 1 Circuit. P0330 Knock Sensor 2 Circuit. P0335 Crankshaft Position Sensor "A" Circuit. P0336 Crankshaft Position Sensor "A" Circuit Range/Performance. P0340 CMP Sensor Circuit malfunction. P0385 Crankshaft Position Sensor "B" NE2 Circuit. P0401 EGR Flow Insufficient. P0402 EGR Flow Excessive. P0420 Catalyst System Efficiency below Threshold. P0430 Catalyst System Efficiency below Threshold Bank 2. P0440 EVAP Control System. P0441 EVAP Control System Improper Purge Flow. P0446 EVAP Control System Vent Control. P0450 EVAP Control System Pressure Sensor. P0451 EVAP Control System Pressure Sensor Range/Performance. P0500 Vehicle Speed Sensor. P0505 Idle Speed Control System. P0510 Close Throttle Position Switch. P1100 BARO Sensor Circuit. P1120 Accelerator Pedal Position Sensor Circuit. P1121 Accelerator Pedal Position Sensor Range/Performance Problem. P1125 Throttle Control Motor Circuit. P1126 Magnetic Clutch Circuit. P1127 ETCS Actuator Power Source Circuit. P1128 Throttle Control Motor Lock. P1129 Electric Throttle Control System. P1130 Air-Fuel Sensor Circuit Range/Performance. P1133 Air-Fuel Sensor Circuit Response. P1135 Air-Fuel Sensor Heater Circuit Response. P1150 A/F Sensor Circuit Range/Performance. P1153 A/F Sensor Circuit Response. P1155 A/F Sensor Heater Circuit. P1200 Fuel Pump Relay Circuit. P1300 Igniter Circuit - No. 1. P1310 Igniter Circuit - No. 2. P1335 No Crankshaft Position Sensor Signal - Engine Running. P1349 VVT System. P1400 Sub-Throttle Position Sensor. P1401 Sub-Throttle Position Sensor Range/Performance Problem. P1405 Turbo Pressure Sensor Circuit. P1406 Turbo Pressure Sensor Range/Performance Problem. P1410 EGR Valve Position Sensor Circuit. P1411 EGR Valve Position Sensor Circuit Range/Performance. P1500 Starter Signal Circuit. P1510 Boost Pressure Control Circuit. P1511 Boost Pressure Low. P1512 Boost Pressure High. P1520 Stop Lamp Switch Signal. P1565 Cruise Control Main Switch Circuit. P1600 ECM. P1605 Knock Control CPU. P1630 Traction Control System. P1633 ECM. P1652 Idle Air Control Valve Control Circuit. P1656 OCV Circuit. P1658 Wastegate Valve Control Circuit. P1661 EGR Circuit. P1662 EGR by-pass Valve Control Circuit. P1780 Park/Neutral Switch.

Hope this helps.

[Konrad C]

As the previous posters have said, the Mk1 is not OBD2 complient and has it's own diagnostic system.

Using a piece of wire, connect pinouts 4 and 13 on the OBD socket. Then turn on the ignition but don't start the engine.

The EML will flash constantly if there are no fault codes stored. If the O2 sensor had a fault, then the EML will flash twice, space then once, longer space then repeat. FastBob has quoted the codes.

Again like the other posters, I think the misfire is more likely caused by the HT leads. If you have the leanburn engines, then the HT leads have to work twice as hard compared to most other ignition installations. This is because they carry the wasted spark current.

Don't buy any old HT leads, they will not last!

Misfires by faulty HT leads will not generate an EML fault code, that is why it did not light or you found no codes.

[frankieboyuk]

as far as HT leads go ive bought new ones 3 times and it does seem to get better but then after a couple of months starts again. and are the OBD 1 sockets the same as OBD 2 sockets as in shape and size

[frankieboyuk]

I haven't changed the plugs because they are the platinum plugs and ment to last 4 or 5 years and they only been in 2 years any idea if they can go early like if HT leads go?

[fastbob72]

Yes it's the same 16 pin socket whether it's EOBD or OBDII,,it's pins 4 and 13 you want to bridge,by the way !!

Your plugs can certainly get fouled up within 2 years depending on the general health of your engine,it's certainly worth traking them out and seeing what their condition is like.

[Konrad C]

I agree with FastBob and would like to add that you have not said what engine you actually have? From your posts so far, I guess you have a pre-vvti engine which has HT leads. VVTI engines use coil packs.

Once we know what engine size you have, we can be a little bit more specific.

Anyway, if you have the 1.6/1.8 lean-burn engine, you need to be using Iridium spark plugs which last up to 60,000 miles. It is not advisable to use lesser plugs because they will not last, and could give the problems similar to what you are getting. Due to the higher temperatures, the lesser spark plugs break down, and can actually melt!

The proper plugs for these engines are Denso SK20R-P13. They are not cheap, but will last a long time. These what I always use.

My earlier response describes how the lean-burn engines uses more firing cycles.

The 2 litre does need at least platinum plugs, but is not as fussy.

One further point, make sure the HT leads have a good tight connection with the spark plugs.

[frankieboyuk]

yes it is 1.8 7a-fe I have had platinum plugs in it I will start with putting some Iridium in it see if that helps thanks I got told off motor factor it needed platinum plugs idiots

[fastbob72]

Let us know how you get on then :)