Code
P02E3
LAND ROVER
P — Powertrain
Diesel intake air flow control - High circuit
Views:
UK: 9
EN: 18
RU: 17
AI status
Completed
Completed
100%
Causes
- Short to battery voltage in the intake air flow control wiring
- Failed or internally shorted intake air flow control actuator/valve
- Corroded or damaged connector or pins at actuator or ECM
- Poor or missing ground for the control circuit
- Faulty ECM or internal driver transistor failure
- Blown or incorrect fuse/relay affecting the circuit
Symptoms
- MIL/Check Engine lamp illuminated
- Reduced engine performance or limp mode
- Poor throttle response or hesitation
- Rough idle or unstable idle speed
- Elevated emissions or failed emissions test
- Possible turbo/boost control abnormalities
What to check
- Read and record freeze-frame data and all stored codes; check for related codes
- Visual inspection of actuator, wiring harness, and connectors for damage, corrosion, or pin push-out
- Inspect fuses and relays related to intake air control and ECM power/ground
- Backprobe the actuator connector with ignition ON (engine OFF) and measure voltage and signal behavior
- Check continuity and resistance between actuator pins and ECM; check for shorts to battery and ground
- Use live data / bi-directional control (scan tool) to command the actuator and observe response
Signal parameters
- Control architecture may be PWM or switched voltage; expected control range varies by model (0–12 V or 0–100% duty cycle)
- Circuit 'high' fault means voltage is near battery voltage when it should be lower or varying under ECU command
- Actuator coil or position sensor resistance typically low (a few ohms to tens of ohms) — consult vehicle service data for exact values
- Normal commanded values should change with ignition ON and during ECU commands; a steady battery-level voltage at the control pin is abnormal
Diagnostic algorithm
- Retrieve freeze-frame and note operating conditions when the code set. Check for other related codes (turbo, boost, MAF, wiring).
- Perform a visual inspection of the intake air flow control actuator/valve, wiring harness, and connectors for damage, contamination, or corrosion.
- Verify relevant fuses/relays and power/ground circuits for the ECM and actuator.
- With key ON (engine OFF), backprobe the actuator connector: measure the control signal and battery voltage. Look for a persistent battery-voltage reading on the control pin.
- Measure resistance between actuator power and ground pins (with connector disconnected) and compare to factory specs. Check for short to battery or short to ground.
- Using a scan tool, command the actuator (if supported) and observe movement and live data. Monitor voltage or duty cycle with an oscilloscope if available.
- Wiggle the harness and connectors while watching live data to catch intermittent faults.
- If wiring and actuator test good, consider replacing the actuator and re-test. If fault remains after actuator replacement, suspect ECM driver fault and verify with manufacturer diagnostics before ECM replacement.
- Clear codes and perform a test drive under the same conditions to confirm repair.
Likely causes
- Actuator stuck or internally shorted to B+
- Damaged harness insulation contacting a 12 V source
- Corroded/loose connector at actuator or ECM
- Open or high-resistance ground on control circuit
- ECM output driver fault (less common)
Fault status
Status
Diesel intake air flow control — High circuit. Control circuit voltage above expected range; possible short to battery, actuator failure, wiring/connector fault, or ECM driver issue. MIL illuminated.
Repair difficulty: Medium
Diagnostic time: 1–3 hours
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