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Iveco daily 2007 camper van
• On most Euro-4 Iveco Daily MY 2006-2009 equipped with Bosch EDC16C39, blink / DTC code 052 means “Boost-pressure (MAP) sensor – signal implausible / out of range.”
• The ECU therefore illuminates the red EDC lamp (critical injection fault) and the yellow engine/MIL lamp, and it will usually drop the engine into limp-home mode.
• In >70 % of the cases the fault is cured by cleaning or replacing the MAP / boost-pressure sensor and repairing any wiring or hose faults feeding that sensor.
Key points
Code system and variants
• Iveco still provides “blink codes” that can be read with the dashboard button or a basic scanner. In the 2006-2009 Daily list, 052 → boost pressure sensor (same information is quoted on IvecoForums and in the EDC16 workshop manual; sometimes also referenced as decimal DTC 135 or P0236).
• In a few earlier EDC7 vehicles a DRV (fuel-pressure regulator) can also report under 052. Therefore always confirm with a scan tool that shows the full hexadecimal/SAE code before buying parts.
Sensor function
• The MAP sensor converts intake pressure (0–3 bar absolute) into a 0.5 – 4.5 V signal.
• The ECU compares “requested boost” with “measured boost.” If the difference is > ±250 mbar for longer than ~2 s, or the sensor voltage is < 0.2 V or > 4.8 V, fault 052 is stored.
Typical failure modes
a. Contamination – oil mist from the crankcase breather and EGR soot coat the diaphragm → slow or stuck response.
b. Open/shorted wiring – rubbed harness on the intake runner, corroded connector pins.
c. Pressure leaks – split hose, cracked plastic intercooler end tank: the sensor itself reads correctly but real boost never reaches target.
d. Turbo/VGT actuator fault – vacuum leak, stuck vanes, or electronic actuator failure keeps boost low.
e. ECU ground / 5 V reference fault – less common but creates multiple unrelated sensor codes beside 052.
Symptoms on the Daily
• Reduced power, max speed ≈ 80 km h⁻¹, limited to 3000 rpm.
• Audible whooshing or hissing under load if there is a boost leak.
• Black smoke during acceleration when boost is low; white smoke when MAP signal is lost completely and fuelling is cut.
• Owners on IvecoForums (thread “yellow engine light on dash – code 052”) consistently report success after removing the MAP sensor from the intake plenum and spraying it with non-residue brake cleaner or dedicated MAF/MAP cleaner.
• Bosch now supplies the sensor as part number 0 281 002 845 (Iveco 504092113). Genuine sensors show markedly higher reliability than no-name e-commerce parts.
• 3-D printed boost-leak test bungs and inexpensive smoke generators allow hobbyists to pressure-test the charge-air circuit in minutes, a technique increasingly used in workshops.
Voltage check (key-on, engine-off):
Pin 1 (5 V ref) – ground: 4.9–5.1 V
Pin 2 (signal) – ground: ≈ 0.5 V (atmospheric)
Pin 3 (ground) – battery negative: < 0.1 VWith engine idling after repair the signal should rise to ~1.2 V and reach 2.5–3.8 V under full load. Any value stuck at 0 V or 5 V indicates wiring or sensor failure.
Analogy: Think of the MAP sensor as the “altimeter” for the ECU; if it lies about the height, the autopilot (boost controller) cannot keep the aircraft level, so the flight computer commands “limp mode” for safety.
• Working on the charge-air path and high-pressure turbo hoses requires the engine to be off and cooled to prevent burns or injury.
• Tampering with EGR or DPF equipment to mask boost faults violates EU emission regulations.
• Record and dispose of oily cleaning solvents responsibly.
Immediate roadside checks
– Stop, cycle ignition; if power is restored for a few minutes the sensor is marginal.
– Verify oil level; turbo seals dislike prolonged over-boost or lack of oil.
Workshop procedure
a. Disconnect battery negative.
b. Unbolt MAP sensor (T25 Torx), keep O-ring clean.
c. Spray internally until clear fluid drips out; air-dry 10 min.
d. Inspect connector, apply dielectric grease, refit.
e. Scan, erase codes, road-test with live data (“Req. boost vs Actual”).
f. If actual boost still deviates, smoke-test the hose/intercooler, then check VGT actuator with a hand-vac pump (–0.8 bar should sweep vanes fully).
Torque specs
• MAP sensor screw: 8 N·m (dry).
• Charge-air hose clamps: 5–6 N·m for spring clips, 9–10 N·m for worm-drive.
• On very early Euro-3 2.8 l engines code 052 can instead point to fuel-pressure regulator (DRV) circuit fault; therefore always cross-check with full OBD read-out (P-codes).
• Repeated sensor failures often indicate excessive crankcase oil mist – check the CCV filter.
• A cracked plastic intercooler sometimes only opens when hot; pressure-test above 1.5 bar to reveal hairline splits.
• Monitor long-term data-logs of MAP and MAF correlation to predict sensor drift.
• Investigate using upgraded metal-core intercoolers to reduce heat-soak and fatigue fractures.
• Explore predictive maintenance via vibration analysis of the VGT actuator motor (now common in Euro-6D vans).
Fault code 052 on a 2007 Iveco Daily almost always flags a boost-pressure (MAP) sensor or boost-control circuit problem. Clean or replace the sensor, repair any split hoses, clear the code and verify that requested and actual boost now match. If your scan tool instead labels 052 as a fuel-pressure fault, follow the same logic for the DRV circuit. Prompt repair prevents turbo damage, restores full power and extinguishes both the red EDC and yellow engine lamps.