Jeza

I have an ICarsoft reader for the early toyota, 2003 hybrid, and techstream. Techstream gives far more info and is easier to read live data. However I find if the Hybrid system has gone into safe mode, or worse, neither can communicate with the ECU. The early models communicate through the OBD port on the J line to the engine ECU, the canbus is very limited.

C1213 - The skid control computer communicates with the hybrid control computer and controls the braking force in coordination with the motor regenerative operation. Reception or transmission to or from the hybrid control computer is not possible. Check the sub code on the data page, could be 152, 153 or 154. This is not necessary a fault, if there is an issue with the hybrid system it stops talking to the other systems. P1636/81 When communication from the Engine Control Computer with the hybrid vehicle control computer is lost Possible issues - Wire Harness or Connector or computers P3002 - When an error occurs in communication from the hybrid vehicle computer to the battery computer ASSY Wire Harness or Connector Hybrid Vehicle Computer Battery computer assembly As the hybrid computer seems to be the common issue I would check all the connectors and harnesses on both the ECU, hybrid computer and battery ECU for damage and water ingress. ECU's are located behind the passenger stowage box and the battery ECU under the passenger seat, connector accessible behind forward trim. I can give you the connectors and relevant pins to check for continuity of each harness. Interestingly on P3002 fault diagnosis the first check is to "Stop operation of all aftermarket vehicle products or electrical products brought into the vehicle." then check if the fault code reappears. attached images are for P3002.

If the light comes on, when you stop check for codes before turning the engine off.

The inverter/converter is very well sealed as is the battery. I would look at this as two separate issues to start with. Do you get any warning lights come on? Is the 12v aux battery good, full capacity and holding charge? When trying to start can you hear the Hybrid relays click from under the passenger seat? Have you checked for any jobd fault codes? Low power could be the engine or the Hybrid system sensing an issue and going into safe or limp mode, engine revs more especially at low speeds. I presume the water leak clear water and not coolant!

Knock sensor P0325/52 - When the knock control sensor is disconnected or shorted for 10 seconds or more at an engine speed of 2000 to 4500 rpm after the engine has warmed up. Possible issues; Wire Harness or Connector - ECU connector B, kah11476 pin 20 Knock Control Sensor - this is hidden under the inlet manifold, I read somewhere that it is possible to access it from going in from under the engine!! Knock control sensor not tightened properly Engine Control Computer check the continuity between the engine control computer's vehicle side connector B20 (KNK1) terminal and the body earth. standard: No continuity 1885/77 - When the hydraulic pressure command value is 0.5 MPa or less and the sensor output value is 3.0 MPa or more for 3 seconds or more. Wire Harness or Connector Hybrid vehicle transaxle assembly Engine Control Computer Disconnect connector D of the engine control computer. check the resistance between the engine control computer's vehicle side connector D2 (SLS+) terminal and D3 (SLS-) terminal. kah11638 Reference value: 5.0-5.6 ohms. I would remove all the ECU connectors, spray with electrical contact cleaner, check for damage, corrosion and damage to the harnesses. Also check in the gearbox area for any damaged wiring and check connectors ar seated correctly.

This is a connector on the head unit that feeds in the vehicle speed. Note this is for a 2.4 10 series hybrid , your wiring will probably be different.

Thanks, but I have adapted a script from another menu .html file and now the wiring menu works. Sounds a bit dodgy buying from a Russian in crypto 🤔

C1310 is a traction control malfunction, this normally occurs when there is a hybrid issue the computer stops regenerative braking and stability control via the rear motor. P3009 When the insulation resistance between the high voltage circuit and the body is below the standard value. 10M ohm. Defective parts listed include the inverter and all the cables that might have been disturbed during the sensor change. How ever, suggest clearing code switch off ignition then on again, not start, and after 2 mins check codes. P3009 relates to the main battery, HV, cables within the battery assy, which I guess you did not disturb apart from the service grip. It could be the main battery cables at the inverter which you disconnected. Has the sensor replacement fixed that issue?

Power output sockets are 110v ac 1500w max, american style 2 pin plug. To use engine must be on, READY light on, 110v select push button, to the right of the steering wheel, push in and the advisory light in the switch will light. Use a continental adaptor to charge phone, laptop, air fryer, induction hob etc with regard to max power and voltage applicable.

Hi Chris I have this CD but would not install onto my windows 11 computer, so I just had to copy the files manually and open index2.html. I also tried installing it under windows XP, that didn't work either. I have translated most of the disc but some reason the wiring diagram menu doesn't work due to a Javascript function that is missing, I think. "function FC(WO)" Can you search your disc to see if is present. Most of the .gif images in the description section have a .pdf version as well but I can't get this to load instead. Next is to find a program that will open, translate scanned .pdf files then save automatically!

Yes, unfortunately. Secondary pulley rotation speed sensor that detects the output shaft rotation speed is placed on the secondary pulley shaft (reduction drive gear), which is NOUT. This the top one on the diagram to the rear of the square shape bit of the gearbox. rab0711c.pdf

DTC P0500 is a vehicle speed fault, not a gearbox speed sensor issue. Gearbox speed sensor faults are DTC P1820 and P1825. The speed signal comes from the wheel speed sensors to the skid control computer then to the combination meter, from there is a wire to the engine ECU, head unit, power amplifier and cruise control. Possibly in that line also is a chip to convert kph to mph. As the issue occured after installing your new head unit I would look at the speed signal wire to that. Grey connector, pin 3, violet colour

What about the cruise control you fitted, has that done something to the speed signal?

Hi There is no alternator on the hybrid, the aux battery is charged from the inverter / converter, 13.6v seems reasonable if the aux battery is fully charged. You have replaced the aux battery so the terminals should be good, check the earth straps, battery to body and body to engine. Anything wrong with the hybrid system would throw up codes. Could be the engine ECU, clutching at straws now without codes.

P3101-548 Abnormal signal received from engine control computer (CVT system abnormality) The hybrid vehicle computer performs fail-safe control based on an abnormality signal from the engine control computer (when the engine control computer detects an abnormality that may affect THS control). This points to the speed sensor on the gearbox as the signal goes to the engine ECU, then the hybrid ECU goes into limp mode. P1825 is the speed sensor circuit NOUT (speed out), wiring or the sensor, there are no other connectors in the circuit. Did you check the NIN circuit to ensure you have the correct connector and pins? Just to rule out the engine ECU being faulty!!

when driving

Do you have the data page for the HYBRID CONTROL ECU which will show gearbox speeds

As above, 12v is very important for the ecu's on starting. The READY light when on means it is ready to drive, flashing - it is starting up from total power off state. You don't need to hold the key in the start position, it is beneficial when the battery is low is to turn the key from off to start in one go. Issues could be the inverter or the combined power steering / gearbox oil pumps are driven by an a/c motor, has failed. Need to get the codes / sub codes read

do you have any sub codes for P3120- xxxx as this will narrow down the fault

You could double check you have the correct pins on the connector, I have had this issue, by checking the good speed sensor in the transmission. Same connector as above but check between pins 12 and 19; Using a Toyota electrical tester, check the resistance between the engine control computer's vehicle side connector D12 (NIN+) terminal and D19 (NIN-) terminal. Reference value: 560-680Ω (20°C) If you get this resistance but nothing on the NOUT pins then you know it is either the sensor or wiring. I had a look at my engine to see if I could see the sensors, but no luck with the inverter cables, hoses and other cables in the way.

This looks to be a transmission issue, check the gearbox oil level, oil hot cycle the shift lever slowly though the whole range and back to Park. Check the transmission oil level with the engine running, top up if necessary with the correct oil, Toyota Genuine CVT Fluid TC. P1825/67 - When the READY lamp is on and the vehicle is traveling at 28 km/h or faster, the secondary pulley speed sensor (NOUT) detects a speed of 300 rpm or less for 2 seconds or more. Wire Harness or Connector Transmission Revolution Sensor Engine Control Computer If you can monitor live transmission data, (S2000 is the Toyota test tool): Inspection Procedure Step 1 S2000 data reading (secondary pulley speed) Connect S2000 to DLC3. Turn the ignition switch ON and read the secondary pulley RPM on the ECU data monitor according to the display screen of the S2000. Reference value: 0 r/min (when stationary) 2600r/min (at constant vehicle speed (approximately 60km/h)) The sensors are underneath the inverter of course!! The resistance can be checked by; Disconnect connector D of the engine control computer. Using a Toyota electrical tester, check the resistance between the engine control computer's vehicle side connector D13 (NOUT+) terminal and D20 (NOUT-) terminal. Reference value: 560-680Ω (20°C) Hope it is just the oil level! rab0716c.pdf

I can't find anything in the manual diagnostics for this issue and why code P1835 is not in the manual. (in the previous post I said "P1820, P1825 and P1835 are referring to transaxle transmission" that should be P1845 not P1835. What are the symptoms when driving? What warning lights come on? Does the gearbox shift gears ok when accelerating? When checking the resistance above was that the harness connector or the position sensor connector? I think it should be the position sensor connector. hdam0480.pdf

If the resistance was high I would check the connectors at the ECU, I will find out the pins on the ecu connector to check out each wire.

P1835, This is not listed in the manual. P1820, P1825 and P1835 are referring to transaxle transmission revolution sensor and oil pressure sensor P3101-548, Abnormal signal received from engine control computer (CVT system abnormality) The hybrid vehicle computer performs fail-safe control based on an abnormality signal from the engine control computer (when the engine control computer detects an abnormality that may affect THS control). C1310-156 IG2 terminal voltage is 10.5V or higher for 1.5 seconds or more, and the traction control disable signal is received for 0.07 seconds or more while communication with the hybrid control computer is active. Hybrid control system (VSC, traction control malfunction). This is a normal fault code when the hybrid computer stops talking to the skid control computer due to a hybrid issue. As I don't think there is a kick down as such, you could check the accelerator pedal connector: Accelerator position sensor resistance check ../../img/a055961.png Use a Toyota electrical tester to measure the resistance between each terminal of the connector. SST 09082-00030 09083-00150 Reference value: Terminal number Reference value 2 (VPA2) ←→ 1 (EP1) 5.0kΩ or less 5 (VPA1) ←→ 3 (EP2) 5.0kΩ or less 4 (VCP1) ←→ 1 (EP1) 1.5-6.0 kΩ 6 (VCP2) ←→ 3 (EP2) 1.5-6.0 kΩ

I do not know, it was just that you were in that area with a mass of wires, something could have been disturbed. Does the replacement head unit support a speed input?