Code
P0069
LAND ROVER
P — Powertrain
Absolute manifold pressure - pressure correlation
Views:
UK: 11
EN: 16
RU: 59
AI status
Completed
Completed
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Causes
- Faulty MAP sensor or internal contamination
- Faulty barometric (BARO) sensor or shared-sensor fault
- Damaged, corroded or disconnected wiring/connectors to MAP or BARO circuits
- Intake manifold vacuum leak, leaking hoses or PCV system fault
- Intake system restriction or turbo/intercooler leak (forced-induction vehicles)
- Blocked intake, stuck throttle plate, or EGR valve stuck open
Symptoms
- Check Engine Light (MIL) illuminated
- Poor idle quality, stumbling or hesitation
- Reduced engine power or limp-home mode on some vehicles
- Higher-than-normal fuel consumption or rough running
- Difficult starting or stalling at idle
What to check
- Read and record freeze-frame and live data for MAP and BARO using a scan tool
- Visual inspection of MAP/BARO sensors, harnesses and connectors for damage, oil or corrosion
- Verify MAP/BARO sensor mounting and vacuum hose routing (if applicable)
- Check for intake manifold vacuum leaks (smoke test or spray test)
- Monitor MAP vs BARO at key-on/engine-off and at idle/throttle conditions to confirm mismatch
Signal parameters
- Barometric pressure (BARO) ~ ambient atmospheric pressure: ~80–110 kPa (sea level ≈101 kPa).
- MAP at idle (naturally aspirated) typically lower than BARO due to vacuum: ~20–40 kPa (depends on engine).
- MAP at wide open throttle should approach BARO (near ambient pressure).
- Typical MAP sensor output voltage range (manufacturer dependent) roughly 0.5–4.5 V across pressure range; at key-on/engine-off MAP ≈ BARO voltage.
- Fuel trims and long-term trim may show adaptations if MAP data incorrect (e.g., high positive trims with vacuum leaks).
Diagnostic algorithm
- Retrieve stored codes and freeze-frame data. Note conditions (rpm, load, MAP, BARO, intake air temp).
- Inspect MAP and BARO sensor connectors and wiring for corrosion, pin damage, or loose terminals. Repair as needed.
- With a scan tool, compare BARO and MAP reading with ignition ON engine OFF. They should be approximately equal (both ambient). If not, suspect sensor or wiring.
- Start engine and observe MAP vs BARO at idle: MAP should be significantly lower than BARO (vacuum) on NA engines. If MAP is equal or close to BARO unexpectedly, check for vacuum leaks or stuck open throttle/EGR.
- Wiggle test harness while monitoring live data to check for intermittent faults. Backprobe sensor and verify reference voltage (typically 5 V), sensor ground, and signal voltage changes with pressure.
- Perform a smoke test or use a vacuum pump to check for intake manifold leaks, unmetered air, or damaged hoses/PCV lines. Repair leaks and retest.
- For turbo/supercharged engines, inspect intercooler, boost pipes and wastegate for leaks or stuck components that could alter MAP unexpectedly.
- If wiring/power/ground good and intake sealed, substitute a known-good MAP sensor or bench-test the suspect sensor per manufacturer procedure.
- Clear codes and perform a road/idle test to confirm the fault does not return. If persistent, consider ECM diagnostic and software updates per manufacturer.
Likely causes
- Failed or intermittent MAP sensor
- Wiring/connector issue at MAP or BARO sensor (open, short, corrosion)
- Intake vacuum leak between sensor and intake manifold
- Contaminated sensor (oil, debris) or sensor exposed to boost where not expected
Fault status
Status
P0069 - Absolute Manifold Pressure/Pressure Correlation: ECM detected inconsistent relationship between MAP and barometric pressure signals. Possible sensor, wiring, intake leak or related fault.
Repair difficulty: Medium
Diagnostic time: 1.5-3.0 hours
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