P1410

Code

SCION P — Powertrain

EGR valve position sensor circuit malfunction

Brand: SCION

Type: P — Powertrain

Views: UK: 1 EN: 3 RU: 3

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Open or shorted wiring between EGR position sensor and PCM
Corroded, loose or damaged connector(s)
Faulty EGR valve position (feedback) sensor
Stuck, seized or mechanically binding EGR valve
Contamination or carbon buildup on EGR valve linkage
Faulty EGR valve actuator (vacuum solenoid or motor)

Symptoms

Check Engine Light (MIL) illuminated
Reduced engine performance, hesitation or lack of power
Rough idle, stalling or surging
Poor fuel economy
Increased NOx emissions / failed emissions test
Possible diagnostic trouble codes for EGR flow or circuit faults

What to check

Read and record stored DTC(s) and freeze frame data with a scan tool
Verify battery/charging system voltage is stable (typically 12–14.5 V)
Visually inspect EGR valve, sensor and connectors for damage, corrosion, or contamination
Wiggle harness and connectors while monitoring live data to find intermittent opens/shorts
Check sensor ground integrity and continuity to PCM ground
Monitor EGR position sensor live data while commanding EGR open/close with a bi-directional scanner

Signal parameters

Typical EGR position sensor voltage range: approximately 0.5–4.5 V (varies by design; some use 0–5 V range)
At rest/closed position: lower end of range (example ~0.5 V); at open position: higher end (~4.0–4.5 V)
Sensor output should change smoothly and proportionally as valve moves (no sudden jumps or dropouts)
Expected change when commanded: measurable and repeatable change in voltage/position percent
Resistance/impedance values depend on sensor type — consult vehicle service manual for exact specs

Diagnostic algorithm

Verify code with a scan tool, clear codes and attempt to re-produce. Note freeze-frame and conditions when code set.
Inspect connector and wiring for obvious damage, corrosion or water ingress. Repair any problems found.
With ignition ON (engine OFF), backprobe sensor connector and verify reference voltage(s) and ground present per service data.
Monitor live EGR position sensor signal while commanding EGR open/close via scan tool. Confirm signal changes smoothly and matches commanded movement.
If no or erratic signal change, check continuity from sensor pins to PCM and measure resistance of sensor if applicable. Repair any open/shorts.
Remove or access EGR valve and verify it moves freely; clean carbon deposits if mechanically restricted. Re-test sensor response after cleaning.
If wiring and valve movement are good but signal remains faulty, replace the EGR position sensor or EGR assembly as specified.
After repair, clear codes and road-test to verify proper operation and that the code does not return. If code persists, consider PCM diagnostic procedures or software updates per dealer/service bulletins.

Likely causes

Damaged or corroded connector at the EGR position sensor
Broken or chafed wiring between sensor and PCM
Carbon buildup preventing EGR valve movement causing no sensor change
Failed EGR position sensor or actuator
Poor ground at sensor or ECM

Fault status

⚠️ Status

EGR valve position sensor circuit malfunction — the control module has detected a sensor signal out of range, no signal, or intermittent/incorrect feedback from the EGR position sensor.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

Your experience will help others

+100 karma for a short comment :)

Was this AI description helpful?

Your feedback helps improve AI descriptions.

👍 Like 0 👎 Dislike 0

Send to email

P1410 — EGR valve position sensor circuit malfunction