Code
P00AD
LAND ROVER
P — Powertrain
Intake Air Temperature Sensor 1 - High Input Circuit - Bank 2
Views:
UK: 9
EN: 16
RU: 14
AI status
Completed
Completed
100%
Causes
- Open circuit or broken wire in the IAT sensor signal or ground
- Short to battery/ignition voltage (5V/3.3V supply) on the sensor signal
- Poor connector contact, corrosion, or water intrusion at the sensor connector
- Faulty IAT sensor (internal damage or incorrect resistance)
- Faulty PCM/ECM or internal module failure (rare)
- Aftermarket intake or recent service damage to wiring or sensor
Symptoms
- MIL (Check Engine Light) illuminated
- Poor idle or drivability issues (may be intermittent)
- Reduced fuel economy or incorrect fuel trims
- Hard starting in some conditions
- Intake temperature reading abnormally high or fixed value on scan tool
What to check
- Read freeze frame and freeze data; note intake air temp reading and conditions
- Scan live data: observe IAT Bank 2 value and compare with Bank 1 and ambient air temp
- Visually inspect IAT sensor and connector for corrosion, bent pins, water, or damage
- Wiggle harness while observing live data to reproduce fault
- Backprobe sensor connector to check reference voltage, signal voltage, and ground
- Measure sensor resistance at the sensor (compare to service spec or chart if available)
Signal parameters
- Typical IAT signal: ~0.5–4.5 V depending on temperature and design (varies by vehicle)
- Open-circuit/over-voltage condition often shows >4.5 V or 'OL' on resistance check
- Sensor resistance changes with temperature (NTC behavior) — consult Land Rover spec for exact Ω vs °C
- Reference supply usually 5V or 3.3V from ECM; signal referenced to engine ground
Diagnostic algorithm
- Verify code and read freeze frame. Note ambient and intake temperatures and engine conditions.
- Inspect sensor and harness for obvious damage, corrosion, oil, or water intrusion. Repair as needed.
- With ignition ON (engine OFF), backprobe sensor connector: confirm ECM reference voltage present on the reference pin and good ground on ground pin.
- Measure signal voltage at connector with ignition ON and engine running. If signal >4.5 V or pegged high, suspect open or short to supply.
- Remove sensor and measure resistance across sensor terminals at known ambient temperature. If resistance is infinite or out of expected range, replace sensor.
- Check continuity from sensor connector pins back to PCM pins. Look for open circuits, high resistance, or short to battery (+) on the signal wire.
- If wiring and sensor check good, verify PCM grounds and reference voltages; inspect for software updates or known issues from technical service bulletins.
- If intermittent, perform a wiggle test of harness while observing live data; repair any wiring chafes or connector issues found.
- After repairs or replacement, clear codes and confirm proper operation with road test and re-scan; ensure IAT Bank 2 reads similar to Bank 1 and ambient conditions.
Likely causes
- Corroded/loose connector at the IAT sensor
- Broken or chafed harness causing open circuit
- Sensor failed (open or internal short to supply)
- Short to battery/ignition feed from adjacent wiring
- PCM reference voltage or ground problem (less likely)
Fault status
Status
Stored when the ECM detects an abnormally high voltage or invalid/open reading from Intake Air Temperature Sensor 1 circuit on Bank 2. The ECM flags the circuit as high input indicating out-of-range signal (likely open circuit or short to voltage).
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 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