I have warning light , check code is P1835, P1301-548, C1310

[benzzy_ku]

I have warning light , check code is P1835, P1301-548, C1310

Can any one help me to clarify above code?

[Picasso]

Welcome Theerawisit there is lots of members with the early hybrid problems im sure some one will be a long soon to help you .

[Gamith]

Those codes could be old - have you cleared the codes and see which ones come back?

 

[benzzy_ku]

Many thanks friend.

[benzzy_ku]

14 hours ago, Picasso said:

Welcome Theerawisit there is lots of members with the early hybrid problems im sure some one will be a long soon to help you .

Many thanks

10 hours ago, Gamith said:

Those codes could be old - have you cleared the codes and see which ones come back?

 

I already delete code but after try to ride just only 500 meters the warning light show up and the code is same.

[Gamith]

I have found these which may help - obviously not Alphard-specific but then the codes shouldn't be:

https://carmodnerd.com/p1835/

https://carmodnerd.com/p1301/

(not sure about any in between these)

https://carmodnerd.com/p1548/

https://carmodnerd.com/c1310/

 

Hopefully these help.

Edited June 11 by Gamith

[benzzy_ku]

Sorry for my mistake, It is should be P3101-548.

[Jeza]

On 6/13/2025 at 11:10 AM, benzzy_ku said:

Sorry for my mistake, It is should be P3101-548.

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)

1. 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:

 

1. Accelerator position sensor resistance check
    

    

   ../../img/a055961.png

   1. 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

       

       

    

 

[benzzy_ku]

The code appear when i run a car with kick down up to the lamp.

 

So it is abnormal from accelerator pedal ?

 

Because I start engine 30 minutes without driving, the code did not show up.

 

The engine is normal, Air condition is normal.

[benzzy_ku]

After checked , below is show data to low. just only 0.519 kΩ

 

Can you help me to clarify , What I should do?

 

4 (VCP1) ←→ 1 (EP1)	1.5-6.0 kΩ
6 (VCP2) ←→ 3 (EP2)	1.5-6.0 kΩ

[benzzy_ku]

If the result is not match to your data, How should i do next?

[Jeza]

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.

[Jeza]

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

[benzzy_ku]

7 hours ago, Jeza said:

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 125.55 kB · 0 downloads

For now When I drive , the car is feeling like save mode, I have to push harder on accelerate paddle.

 

Also the code that appear is P1825.