P2138 mitsubishi

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Code No. Check code No. P accelerator pedal position sensor main circuit low input Refer to. P accelerator pedal position sensor sub circuit low input Refer to. Engine-ECU checks the accelerator pedal position sensor output signal characteristics for abnormal conditions.

P2138 mitsubishi

Log in. Sign up. JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding. Last week I was slowly coasting down my neighborhood street and suddenly I felt power loss in the car accompanied by the check engine light. The flagged code is P which represents a bad throttle position sensor. I have since replaced my throttle position sensor with 2 separate brand new sensors from the dealer, both of which have done nothing to fix the code. Today I spent half my day at the dealer fighting with them about how its just not probable that two brand new sensors are bad. They refused to do a voltage check on the pins of the sensor as the stickied workshop manual describes. This is where the second brand new sensor comes in.

Engine-ECU checks the accelerator pedal position sensor output signal characteristics for abnormal conditions. Originally Posted by Mitz.

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Advertiser Disclosure. The voltage readings going to the Engine Control Module ECM from the throttle body position sensor and accelerator pedal position sensor do not match each other. On older vehicles, the throttle body was connected to the accelerator pedal via a throttle cable which was a mechanical link between the two. When you pushed the accelerator pedal the throttle body opened, simple as that. As vehicles became more powerful, emissions controls became stricter and better fuel mileage was a requirement, there needed to be a way for the Engine Control Module ECM to control the throttle more precisely. Thus, the drive by wire system was introduced.

P2138 mitsubishi

In this video, our mechanic breaks down the P code, its symptoms, including poor acceleration and reduced power mode, and shows you how to diagnose the potential causes so you know what to do to clear the code. Want to watch more videos like this? Visit our video library for thousands of automotive diagnostic and how-to videos. As our mechanic explains in the video above , a gas pedal has two APP sensors to essentially serve as fail-safes for each other in case one triggers an error code. He uses an OBD-II scan tool to look at the data for both sensors to see whether the sensors are working normally. You can see if the data correlates by watching it on your scan tool as you press the gas with your car parked. We recommend addressing the issue causing code P as soon as possible. If the data changes, that indicates the issue is stemming from the pedal itself and not the sensor wires. You can also watch the data being graphed while you wiggle the wires to see if the data changes, which would indicate a wiring or connector issue is triggering P Disconnect the connector to further inspect it, and check for any corrosion in the terminals.

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STEP 4. They refused to do a voltage check on the pins of the sensor as the stickied workshop manual describes. I'm having the same issue and also have the rostra cruise control. Perform resistance measurement at accelerator pedal position sensor connector. Clearing it turned the Service Engine light off. Limped to a side street to check the oil level as an oil change was the latest action taken on the car. Please consider creating a new thread. Insert Quotes Quotes Post Reply. All times are GMT. STEP 7. Change of accelerator pedal position sensor main output voltage per 25 milliseconds is less than 0. I have since replaced my throttle position sensor with 2 separate brand new sensors from the dealer, both of which have done nothing to fix the code. I dont know if that is true. P accelerator pedal position sensor sub circuit low input Refer to. This is where the second brand new sensor comes in.

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After replacing the accelerator pedal assembly, reconfirm whether the diagnosis code is set. The limp mode has never occurred again since removing it. Some dealerships agh. Sign up. Go to Step 4. Originally Posted by Mitz. I dont know if that is true. Cleaned ground and re-tested. The light goes out, the car starts and runs normally but the code comes back. STEP 6. The flagged code is P which represents a bad throttle position sensor. You will need to get your keys reprogrammed after swapping ECU's. Clear the code, shut the ignition off and back on, re-scan and the code is back. Check code No. At this point we reviewed the Edmund's link above and began scouring the workshop manual to find the connectors referenced in the description but didn't have any luck.