DTC P010D00 – Mass or Volume Air Flow “B” Circuit High Input.

P010D00 — MAF Sensor “B” Circuit High Input

This code means the ECM is seeing a higher-than-expected voltage from the MAF Sensor B (usually the second MAF on dual-intake engines or a secondary signal on some turbo engines).

High input = voltage too high, usually > 4.5V.

✅ Common Causes

Sensor-related

Contaminated MAF sensor (oil, dust, moisture)

Faulty MAF sensor “B”

Wrong type of aftermarket MAF installed

Electrical

5V reference shorted to signal wire

Signal wire shorted to power supply

Open ground wire → voltage rises

Corroded or damaged connector pins

Poor connector fit (loose terminal tension)

Air intake

Severe intake leak after MAF

Clogged air filter causing abnormal airflow reading

Engine issues

Overboost condition causing abnormal mass flow

PCV system leaks or stuck valve

🔧 Step-by-Step Diagnosis (Workshop Method)

1. Check Live Data (Scan Tool)

Look at:

MAF B g/s or kg/h

MAF B voltage

Normal at idle (varies by engine):

Voltage: 0.8–1.2V

Flow: 2–6 g/s (petrol), 5–12 g/s (diesel)

If voltage is stuck high (4.5–5V) → electrical fault or bad sensor.

2. Inspect Air Intake System

Check air filter for blockage.

Check ducting for cracks, loose clamps.

Ensure no aftermarket oiled filters contaminating the MAF.

If dirty, clean the sensor using MAF Cleaner only (no carb/brake cleaner).

3. Inspect Connector & Wiring

Look for:

Oil contamination

Broken wires

Green corrosion inside pins

Loose terminals

Pin Testing (Typical 5-wire MAF)

Pin Expected Reading

5V ref 4.8–5.0V
Ground <0.1V drop
Signal 0.5–1.5V idle
Temp signal 1–4V
12V supply (some types) 11–14V

If signal = 5V constant

→ Short to 5V reference
→ Open ground
→ Sensor internal fault

4. Perform Wiggle Test

With engine idling, gently move:

Harness

MAF connector

Intake pipe

If MAF voltage spikes → wiring issue.

5. Check for Intake/Vacuum Leaks

Use:

Smoke machine
or

Carb cleaner around intake pipe seams

Leaks after the MAF cause the PCM to miscalculate airflow.

6. Swap Test (If vehicle has dual MAF)

Swap MAF A ↔ MAF B.

If code changes from P010D00 → P010C / P010A / P010B, then: → Faulty MAF sensor B

7. Check Engine for Overboost (Turbo Vehicles)

Overboost can cause abnormal air mass readings.

Check:

Boost control solenoid

Wastegate function

Stuck VGT vanes

🛠️ Repair Solutions

Fault Repair

Dirty sensor Clean with MAF cleaner
Failed MAF sensor Replace MAF B
Damaged wiring/connector Repair/replace wiring
Intake leak Fix hoses, clamps
Blocked air filter Replace
Shorted 5V or open ground Repair wiring at MAF/ECM
Overboost condition Turbo control diagnosis

⏱️ Labor Time Estimate

Basic inspection: 0.3–0.5 hr

Wiring repair: 0.5–1.2 hr

MAF sensor replacement: 0.2–0.4 hr

Welcome To Madurai Car Service 💐🙏.