Codes P1515 and P1516

Hi,
these fault codes p1515 and p1516,related to throttle valve. check throttle valve for excessive carbon deposit, use the link below for cleaning procedure.

https://www.2carpros.com/articles/throttle-actuator-service

1.check the throttle valve connector if installed properly not loose.
2.check if the inside connector in not corroded or damaged, check its wires visually for any sign of overheated or not sticked to each other.

https://www.2carpros.com/articles/how-to-check-wiring

3.remove throttle valve connector fig 1.use voltmeter

4.turn ignition on, with engine off, measure the voltage of TAC motor control1 and TAC motor control 2circuit which are pin E brown in color pin F yellow in color ,check fig2,of the throttle actuator motor with DVOM connected to ground is the voltage greater than 11 volts for both circuits ?if yes, go to step 8.if no go to next step.

5.is the voltage less than 2volts?if yes go to step7,if no go to next step.

6.test TAC motor control circuit that measured greater than 2volts for a short to voltage did you find and correct the condition ?if yes go to step13,if no go to step8.

7.test TAC motor control circuit that measured less than 2 volts for a short to ground. did you find and correct the condition? if yes go to step13.if no go to step10.

8.test TAC motor control 1 and TAC motor control 2 circuit for high resistance. did you find and correct the condition? if yes go to step13,if no go to next step.

9.test for poor connection or terminal tension at the throttle body connector. did you find and correct the condition? if yes go to step 13 if no go to step 11.

10.test for a poor connection and terminal tension at the ECM fig3.did you find and correct the condition. if yes go to step13.if no go to step 12.

11.replace throttle body assembly. after replacing throttle body go to step 13.

12.turn ignition off. replace ECM, perform ECM relearn procedure(programming).after replacing go to next step.

13.using scan tool clear all the fault codes, turning ignition off for 30seconds then test drive.

Check out the diagrams (Below). Let us know what happens and please upload pictures or videos of the problem.

Hello,

It sounds like throttle body assembly defected, but before i want you to check if the throttle valves open when you push by your hand (be careful to your fingers) closes by itself because it's spring loaded.

when throttle valve connector and ECU connector are tight and free of corrosion, water and dirt, use these simple tests.to make sure throttle body to ECM harness good.

use voltmeter check link below how to use it.

https://www.2carpros.com/articles/how-to-use-a-voltmeter

remove throttle valve connector, ignition on.
your throttle connector looks like the picture below figure 1,put voltmeter red probe on throttle connector pin E which its wire brown in color and voltmeter black probe on a good ground, you must get more than 11 volts, also check the pin F of the connector, voltmeter red probe on pin yellow in color and the black probe of the voltmeter on ground, you must get also 11v,if both values are more than 11 volt then the harness and engine control unit are good.

then throttle body assembly must be replaced. please update what happens with you.

Hello,

then it sounds your throttle valve assembly defected must be replaced.

Check the procedure and diagrams how to remove and reinstall throttle valve.

Let us know what happens with you.

Hello,

yes, you can get well known used throttle valve, and does not need programming. Just after installation turn on the ignition for about 1 minutes it will adapt erase fault codes and test drive.

Let us know what happens with you.

Thank you.