Czy wolisz polską wersję strony elektroda?
Nie, dziękuję Przekieruj mnie tamHello, I have a 2001 MAN L2000 LE180C that starts late.
• In more than 80 % of MAN L2000 “late-starting” cases the root cause is loss of fuel pressure during the stand-still period – most commonly air ingress at the filter head or internal leak-off from one or more common-rail injectors.
• Start with a quick fuel-system integrity check (clear hose in the low-pressure line, injector leak-off test, filter/O-ring inspection) before moving to electrical, pre-heat and compression diagnostics.
• If the EDC lamp is on or cranking rail-pressure stays below ≈250 bar, retrieve fault codes with MAN-cats/Texa and examine the crank-speed sensor and rail-pressure control valve.
Symptoms clarification
– Does it crank fast but fire only after 5–10 s (typical of fuel bleed-down)?
– Does it only misbehave when ambient is < 5 °C (points to flame-start system)?
– Is the EDC lamp on or engine limited to 1 800 rpm (suggests sensor or rail-pressure fault)?
High-probability fault areas
2.1 Low-pressure fuel circuit
• Porous hand-primer diaphragm, cracked hose on suction side, loose banjo washers on filter head.
• Clogged main/secondary filter (replace; torque filter cap 25 Nm, lubricate O-ring).
• Test: insert 200 mm of clear 8 mm ID diesel hose between filter outlet and high-pressure pump; bubbles after overnight parking = air ingress.
2.2 Injector leak-off / rail pressure decay
• Opening pressure drops with age; rail bleeds off < 30 min after shutdown, ECU waits until ≈250–300 bar is rebuilt → long crank.
• Perform leak-off test: collect return from each injector in 100 ml graduated vials during 20 s of cranking; any cylinder returning > 30 ml or > 2× the lowest is defective.
2.3 Flame-start (cold-start) system – D0834 engine
• No dash “spiral” icon or audible solenoid click below 5 °C → check 50 A fuse, relay, and heater element resistance (should be 0.1–0.2 Ω cold).
• Ensure diesel feed line to flame plug is not gelled; replace 50 µm inline screen if fitted.
2.4 Electrical / starter circuit
• Cranking speed must exceed ≈180 rpm: measure voltage at starter “B+” and engine block; > 9.6 V under load.
• Voltage drop test: > 0.5 V on either positive or ground path = clean/replace cables or starter.
• Batteries in L2000 are often parallel 12 V 135 Ah; load-test each to 50 % CCA.
2.5 Engine-management sensors
• Crankshaft speed sensor gap: 0.6–1.2 mm; resistance 750–1 050 Ω @ 20 °C.
• Rail-pressure control valve (ZME/MPROP): contamination can cause slow pressure rise; clean with Bosch CR cleaner or replace.
Step-by-step diagnostic workflow
• High-sulphur tolerant Bosch CP1 pumps used on early 2000’s MANs now suffer from internal wear with modern ULSD; re-sealing kits and exchange units are widely available (2024 price ≈ €750).
• Aftermarket “transparent” filter heads with priming bulb allow easier visual leak detection and are becoming popular retrofit options in EU truck workshops.
• Diagnostic tooling: Texa IDC5 Truck 2023.3 adds guided procedures for MAN MS5/MS6 EDC, including automatic rail-pressure ramp test during crank.
• Why air causes long crank: compressible air pocket in pump has to be purged; until rail pressure > 250 bar ECU suppresses pilot injection for smoke control, extending start time.
• Injector leak-off analogy: like a pin-hole in a garden hose — pressure never builds until the pump outruns the leak.
• Cold-start heater: unlike passenger-car glow plugs, the MAN flame-start actually burns diesel in the intake, raising charge-air temperature ~80 °C within 20 s.
• Do not bypass safety interlocks (neutral switch, air-pressure inhibit) – vehicle may move unexpectedly.
• Dispose of diesel-contaminated absorbents according to local hazardous-waste regulations (e.g., EU List of Waste code 13 02 08*).
• Always pre-fill new filters with clean diesel to minimise cranking.
• Fit transparent return hoses temporarily for leak-off observation but replace them with OEM fabric-reinforced lines for long-term high-temperature safety.
• When probing connectors, use back-probe pins; never pierce insulation (corrosion path).
• Data values apply to MAN D0834 LFL09 engine; verify against chassis number-specific workshop manual.
• If engine exhibits white smoke AND hard start only hot, suspect worn pump head-rotor clearance (fuel boils at shutdown → vapour lock).
• Investigate bio-diesel blends ≥ B20 effect on early Bosch CP1 seals.
• Explore retro-fitting electric-fuel-lift pumps with automatic prime to reduce start latency.
• Follow MAN service bulletin SB-13-EDC-2023 on updated rail-pressure control valves with anti-stick coating.
Late starting on the 2001 MAN L2000 is almost always a fuel-delivery problem: air ingress, pressure bleed-down through injectors, or weak lift/high-pressure pump. Verify fuel tightness with a clear-hose test, perform an injector leak-off and monitor rail pressure during cranking. Address any EDC fault codes, ensure batteries and starter deliver > 180 rpm, and confirm cold-start flame system operation. Working through this checklist methodically resolves the majority of delayed-start complaints without unnecessary component replacement.
