Throttle body unresponsive after ten seconds

  • 2013 MAZDA CX-9
  • 3.7L
  • 6 CYL
  • 2WD
  • 108,000 MILES
I changed the spark plugs. In the process I removed the throttle body and moved the position of the blade. Now the car idles rough and the throttle body becomes unresponsive after 10 seconds.
Do you
have the same problem?
Saturday, October 17th, 2020 AT 12:43 PM

1 Reply


The throttle plate is attached to a motor. You may have damaged it when you were moving it. What I suggest is to check the circuit and throttle body to see if it fails. I don't feel that anything has happened at the PCM, but rather, I feel if it's an electrical issue, it's at the plug. So, the directions I'm providing will help determine if there is a problem there. The last part is at the PCM.

If you find the wiring checks good, I have a feeling the TB may need replaced. However, I would not do that until I scan the computer system to see if there are diagnostic trouble codes related to the TB.

Here are the directions for testing / inspection of the circuit and TB. The attached pics correlate with the directions.


2013 Mazda Truck CX-9 FWD V6-3.7L
Throttle Body Inspection
Vehicle Powertrain Management Computers and Control Systems Electronic Throttle Actuator Testing and Inspection Component Tests and General Diagnostics Throttle Body Inspection

Resistance Inspection

1. Disconnect the negative battery cable. See: Battery > Removal and Replacement > Battery Removal/Installation

2. Remove the engine cover. See: Engine > Removal and Replacement > Engine Cover Removal/Installation

3. Disconnect the throttle body connector.

4. Measure the resistance between throttle body terminals A and B.

Pic 1

Throttle body resistance
- 1-900 ohms

- If not as specified, replace the throttle body. See: Intake Manifold > Removal and Replacement > Intake-Air System Removal/Installation
- If as specified, carry out the "Circuit Open/Short Inspection". (See Circuit Open/Short Inspection.)

Circuit Open/Short Inspection

1. Disconnect the PCM connector.

2. Inspect the following wiring harnesses for open or short (continuity check).

Pic 2

pic 3

Open circuit

- If there is no continuity, the circuit is open. Repair or replace the wiring harness.

- Throttle body terminal A and PCM terminal 2BO
- Throttle body terminal B and PCM terminal 2BR

Short circuit

- If there is continuity, the circuit is shorted. Repair or replace the wiring harness.

- Throttle body terminal A and power supply
- Throttle body terminal A and ground
- Throttle body terminal B and power supply
- Throttle body terminal B and ground


Let me know if this is something you can do. Also, confirm the connections are clean and tight. Check to make sure none of the pins in the plug have been damaged or pushed in when reconnecting.

Let me know.

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Saturday, October 17th, 2020 AT 9:00 PM

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