Code
P22D6
Generic
P — Powertrain
Turbocharger Turbine Inlet Valve Position Sensor Circuit Low
Views:
UK: 13
EN: 44
RU: 15
AI status
Completed
Completed
100%
Causes
- Damaged or corroded sensor connector or wiring (short to ground, open, or high resistance)
- Failed turbine inlet valve position sensor (potentiometer/Hall-effect)
- Loss of sensor reference voltage (usually 5 V) or sensor ground
- Poor connection or intermittent contact at ECM/PCM connector
- Faulty turbine inlet valve actuator or mechanical binding preventing expected sensor travel
- ECM/PCM internal fault (less common)
Symptoms
- Malfunction Indicator Lamp (MIL) or Check Engine light illuminated
- Reduced engine power or limp-home mode
- Poor boost control — low or inconsistent turbo boost
- Delayed boost or excessive turbo lag
- Hesitation or rough running under load
- Reduced fuel economy; possible black smoke under heavy load
What to check
- Read freeze frame and live data with a scan tool; note sensor voltage and commanded valve position
- Visual inspection of sensor, connector, and wiring for damage, corrosion, or heat exposure
- Backprobe sensor connector and verify reference voltage (typically 5 V) and ground with ignition ON
- Measure sensor signal voltage while moving actuator (or commanding actuator) and observe smooth change
- Perform continuity and resistance checks from sensor power/ground/signal pins to ECM
- Wiggle test harness while watching live data for intermittent changes
Signal parameters
- Reference supply: typically ~5 V from ECM (verify vehicle-specific spec)
- Ground: near 0 V; good ground required for accurate signal
- Signal voltage: typically between ~0.1–4.9 V depending on valve position (0 V or low when closed, ~2.5 V mid-travel, near supply when open) — manufacturer dependent
- Hall-effect variants: 0.5–4.5 V variable output rather than pure resistance
- Potentiometer variants: measurable resistance across sensor terminals (often in the 1 kΩ–10 kΩ range) that changes smoothly with movement
- Fault indicator: sustained signal below expected minimum (low voltage) or no change with commanded movement
Diagnostic algorithm
- Retrieve freeze-frame data and live sensor values with a scan tool. Note sensor voltage, commanded position, and any related codes (boost control, actuator codes).
- Perform a visual inspection of the sensor connector and wiring harness near the turbo for damage, heat chafing, corrosion, or oil contamination.
- With ignition ON (engine off), backprobe the connector: verify reference voltage (~5 V), ground continuity to chassis, and that the signal line is present. If reference or ground missing, trace wiring to ECM.
- Command the turbine inlet valve (if supported) while monitoring sensor signal on the scan tool. Observe if signal moves smoothly in response to commands. If no movement, check actuator and mechanical linkage.
- If signal is low, measure sensor output voltage while manually moving the valve or actuator (if accessible) to check for smooth voltage change. Note any dead spots or intermittent readings.
- Perform resistance and continuity checks: measure resistance across sensor terminals (if potentiometer type) and continuity from sensor pins to ECM pins. Repair any opens/shorts.
- Wiggle the harness and connectors while monitoring signal to detect intermittent faults. Repair damaged wiring or secure connectors as needed.
- If wiring and harness test good but sensor output remains out of range, replace the sensor. If replacement does not correct the issue, inspect the ECM connector and consider ECM testing.
- After repairs, clear codes, perform relearn or calibration procedures if required by manufacturer, and road test to verify proper boost control and that the code does not return.
Likely causes
- Worn or contaminated sensor connector pins causing low voltage reading
- Broken/frayed wiring in harness near turbo or heat-damaged area
- Sensor internal shorted element or degraded potentiometer
- Missing or weak ground at sensor due to corrosion
- Valve stuck or obstructed so sensor reads near end-of-travel (low voltage)
- Failed actuator electronics causing incorrect sensor output
Fault status
Status
Turbocharger turbine inlet valve position sensor circuit - low voltage detected. ECM has stored DTC P22D6. Possible wiring, sensor, or power/ground fault affecting boost control.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P22D6
LAND ROVER
P — Powertrain
Turbocharger Intake Valve Position Sensor Circuit low turbo compressor
Views:
UK: 0
EN: 5
RU: 2
AI status
Completed
Completed
100%
Causes
- Damaged or corroded sensor connector or wiring (short to ground, open, or high resistance)
- Failed turbine inlet valve position sensor (potentiometer/Hall-effect)
- Loss of sensor reference voltage (usually 5 V) or sensor ground
- Poor connection or intermittent contact at ECM/PCM connector
- Faulty turbine inlet valve actuator or mechanical binding preventing expected sensor travel
- ECM/PCM internal fault (less common)
Symptoms
- Malfunction Indicator Lamp (MIL) or Check Engine light illuminated
- Reduced engine power or limp-home mode
- Poor boost control — low or inconsistent turbo boost
- Delayed boost or excessive turbo lag
- Hesitation or rough running under load
- Reduced fuel economy; possible black smoke under heavy load
What to check
- Read freeze frame and live data with a scan tool; note sensor voltage and commanded valve position
- Visual inspection of sensor, connector, and wiring for damage, corrosion, or heat exposure
- Backprobe sensor connector and verify reference voltage (typically 5 V) and ground with ignition ON
- Measure sensor signal voltage while moving actuator (or commanding actuator) and observe smooth change
- Perform continuity and resistance checks from sensor power/ground/signal pins to ECM
- Wiggle test harness while watching live data for intermittent changes
Signal parameters
- Reference supply: typically ~5 V from ECM (verify vehicle-specific spec)
- Ground: near 0 V; good ground required for accurate signal
- Signal voltage: typically between ~0.1–4.9 V depending on valve position (0 V or low when closed, ~2.5 V mid-travel, near supply when open) — manufacturer dependent
- Hall-effect variants: 0.5–4.5 V variable output rather than pure resistance
- Potentiometer variants: measurable resistance across sensor terminals (often in the 1 kΩ–10 kΩ range) that changes smoothly with movement
- Fault indicator: sustained signal below expected minimum (low voltage) or no change with commanded movement
Diagnostic algorithm
- Retrieve freeze-frame data and live sensor values with a scan tool. Note sensor voltage, commanded position, and any related codes (boost control, actuator codes).
- Perform a visual inspection of the sensor connector and wiring harness near the turbo for damage, heat chafing, corrosion, or oil contamination.
- With ignition ON (engine off), backprobe the connector: verify reference voltage (~5 V), ground continuity to chassis, and that the signal line is present. If reference or ground missing, trace wiring to ECM.
- Command the turbine inlet valve (if supported) while monitoring sensor signal on the scan tool. Observe if signal moves smoothly in response to commands. If no movement, check actuator and mechanical linkage.
- If signal is low, measure sensor output voltage while manually moving the valve or actuator (if accessible) to check for smooth voltage change. Note any dead spots or intermittent readings.
- Perform resistance and continuity checks: measure resistance across sensor terminals (if potentiometer type) and continuity from sensor pins to ECM pins. Repair any opens/shorts.
- Wiggle the harness and connectors while monitoring signal to detect intermittent faults. Repair damaged wiring or secure connectors as needed.
- If wiring and harness test good but sensor output remains out of range, replace the sensor. If replacement does not correct the issue, inspect the ECM connector and consider ECM testing.
- After repairs, clear codes, perform relearn or calibration procedures if required by manufacturer, and road test to verify proper boost control and that the code does not return.
Likely causes
- Worn or contaminated sensor connector pins causing low voltage reading
- Broken/frayed wiring in harness near turbo or heat-damaged area
- Sensor internal shorted element or degraded potentiometer
- Missing or weak ground at sensor due to corrosion
- Valve stuck or obstructed so sensor reads near end-of-travel (low voltage)
- Failed actuator electronics causing incorrect sensor output
Fault status
Status
Turbocharger turbine inlet valve position sensor circuit - low voltage detected. ECM has stored DTC P22D6. Possible wiring, sensor, or power/ground fault affecting boost control.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
Workshop Manuals
Repair manuals for LAND ROVER
3
Land Rover Defender 300Tdi — Workshop Manual (1996 model year)
Workshop Manual199,00 UAH
Land Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)
Workshop Manual199,00 UAH
Land Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)
Workshop Manual199,00 UAH
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
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0
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