AutoCodes – Scion – P1100 Scion

P1100 Scion Code - BARO Sensor Circuit Malfunction

Quick Answer

The Barometric (BARO) Pressure Sensor is built into the Engine Control Module (ECM). Common causes include Faulty Engine Control Module (ECM). Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P1100 Scion indicates BARO Sensor Circuit Malfunction.
Common causes: Common causes include Faulty Engine Control Module (ECM).
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 1,661

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Apr 14, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1100 Scion Description

The Barometric (BARO) Pressure Sensor is built into the Engine Control Module (ECM). This is a semiconductor pressure sensor with properties which cause its electrical resistance to change when stress is applied to the sensor’s crystal (silicon) (piezoelectric effect). This sensor is used to detect the atmospheric (absolute) pressure and outputs corresponding electrical signals. Fluctuations in the air pressure cause changes in the intake air density, which can cause deviations in the air-fuel ratio. The signals from BARO sensor are used to make corrections for these fluctuations. If the ECM detects DTC P1100, the fail safe function operates and the atmospheric pressure is set at a constant 760 mmHg.

OBDII Code P1100 Scion - BARO Sensor Circuit Malfunction - AutoCodes.com — P1100 Scion Code - BARO Sensor Circuit Malfunction

What does this mean?

What are the Possible Causes of the DTC P1100 Scion?

Faulty Engine Control Module (ECM)

How to Fix the DTC P1100 Scion?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1100 Scion code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P1100 Scion Code

1. What does the OBDII code P1100 in a Scion indicate?

The P1100 code in a Scion indicates a malfunction in the Barometric Pressure (BARO) sensor circuit, suggesting that the sensor or its circuit is not performing within the expected range.

2. What symptoms might I notice if my Scion has the P1100 code?

Symptoms of the P1100 code can include poor engine performance, irregularities in engine idling, decreased fuel efficiency, and possibly the Check Engine Light turning on.

3. What could cause the P1100 code to appear in a Scion?

Possible causes for the P1100 code include a faulty BARO sensor, wiring issues in the BARO sensor circuit such as shorts or open wires, or problems with the Engine Control Module (ECM) itself.

4. How can I fix the P1100 code in my Scion?

To fix the P1100 code, start by inspecting the BARO sensor and its connections for any visible damage or loose connections. If the sensor and wiring appear intact, consider testing the sensor's output with a multimeter, and replace the sensor if it is defective.

5. Is it safe to drive my Scion with the P1100 code?

While you can typically still drive your vehicle with a P1100 code, doing so with a malfunctioning BARO sensor can lead to reduced engine performance and increased fuel consumption. It's advisable to address the issue promptly to avoid potential long-term damage.

6. How does a mechanic diagnose the P1100 code in a Scion?

A mechanic will typically begin diagnosing the P1100 code by connecting a diagnostic scanner to read all stored codes and freeze frame data. They will inspect the BARO sensor and its associated wiring for defects and may use a digital multimeter to verify the sensor's functionality and signal output.

7. Can a faulty BARO sensor affect the overall performance of my Scion?

Yes, a faulty BARO sensor can significantly impact the engine's performance. The sensor provides crucial barometric pressure data to the ECM, which influences fuel mixture and timing adjustments necessary for optimal engine performance.

8. What tools are needed to diagnose the P1100 code on a Scion?

Diagnosing the P1100 code typically requires a diagnostic scan tool to read and clear codes, a digital multimeter for electrical testing, and possibly an oscilloscope to analyze the sensor's signal more deeply.

9. How often do BARO sensor issues occur in vehicles?

Issues with BARO sensors are not exceedingly common but can occur, especially in older or high-mileage vehicles. Environmental factors like extreme temperatures and contamination can also lead to sensor failures over time.