Code
P0363
Generic
P — Powertrain
Misfire Detected - Fueling Disabled
Views:
UK: 2,051
EN: 408
RU: 1,077
AI status
Completed
Completed
100%
Causes
- PCM commanded fuel disable to protect engine (safety strategy)
- Failed or commanded-off fuel injector or injector circuit open/short
- Low or no fuel rail pressure (fuel pump, relay, fuse, clogged filter)
- Ignition failure (bad coil, spark plug, wiring)
- Crankshaft or camshaft sensor fault or timing/synchronization loss
- Severe engine mechanical problem (low compression, valve issue)
Symptoms
- Check Engine MIL illuminated
- Rough idle or pronounced misfire
- Loss of power, sluggish acceleration or engine stalling
- No-start or crank/no-run if fueling fully disabled
- Fuel pump not audible when key on (possible fuel disable)
- Possible backfiring or unusual exhaust smell
What to check
- Read DTCs and freeze-frame data; note misfire counts and related codes (P03xx range)
- Check fuel pump fuse, relay and listen for pump prime with key ON
- Measure fuel rail pressure at key ON and while cranking/running
- Scan live data: misfire counters, injector pulse widths, long/short-term fuel trims, fuel rail pressure, crank/cam signals
- Inspect wiring and connectors for injectors, coils, crank/cam sensors and PCM grounds
- Verify injector resistance and operation with a noid light or oscilloscope
Signal parameters
- Cylinder misfire counts (per-cylinder) — expect zero or very low at steady state
- Fuel rail pressure (psi/bar) — should match manufacturer spec at idle and key ON prime
- Injector pulse width (ms) — should be present and vary with RPM/load
- Short-term and long-term fuel trims (%) — large corrections may indicate fueling issue
- Crankshaft sensor signal (frequency/voltage) and camshaft correlation — stable square wave/sinusoidal as specified
- Battery voltage (V) — stable 12–14 V during cranking/running
Diagnostic algorithm
- Retrieve all codes and freeze-frame; prioritize misfire counts and any fuel system codes.
- Verify whether PCM is actively commanding fuel disable (check status flags/logs).
- Confirm fuel pump operation: check fuse/relay, listen for pump prime, measure fuel rail pressure.
- If fuel pressure is low/absent, diagnose fuel supply (pump, relay, filter, pressure regulator, lines).
- Test injector circuits: measure resistance, check continuity to PCM, verify injector pulse with noid light or scope.
- Verify ignition on suspected cylinders: inspect plugs, test coils, check secondary spark under load if safe.
- Check crank and cam sensor signals and timing/chain/belt condition; correct timing faults before further testing.
- Perform compression or leak-down test if mechanical failure is suspected from other tests.
- Repair or replace faulty components; clear codes and perform controlled road test while monitoring misfire counters and fuel status.
- If fueling was disabled by PCM without obvious cause, review PCM software, recent repairs, and manufacturer service info before replacing modules.
Likely causes
- Fuel pump not running or low rail pressure causing PCM to disable fueling
- Injector wiring harness open, shorted, or failed injector preventing fuel delivery
- PCM detected severe misfire and entered fuel-cut strategy to protect catalytic converter
- Ignition coil or spark plug failure causing persistent misfire and fuel disable
- Crank/cam sensor fault or timing loss leading PCM to disable injection
Fault status
Status
Misfire Detected - Fueling Disabled. PCM has detected a misfire condition and disabled or inhibited fuel delivery to protect the engine; further diagnosis required to find root cause.
Repair difficulty: Medium
Diagnostic time: 1.5-4.0 hours
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Code
P0363
LAND ROVER
P — Powertrain
Ignition coil failure detection - fueling disabled
Views:
UK: 1,163
EN: 294
RU: 634
AI status
Completed
Completed
100%
Causes
- PCM commanded fuel disable to protect engine (safety strategy)
- Failed or commanded-off fuel injector or injector circuit open/short
- Low or no fuel rail pressure (fuel pump, relay, fuse, clogged filter)
- Ignition failure (bad coil, spark plug, wiring)
- Crankshaft or camshaft sensor fault or timing/synchronization loss
- Severe engine mechanical problem (low compression, valve issue)
Symptoms
- Check Engine MIL illuminated
- Rough idle or pronounced misfire
- Loss of power, sluggish acceleration or engine stalling
- No-start or crank/no-run if fueling fully disabled
- Fuel pump not audible when key on (possible fuel disable)
- Possible backfiring or unusual exhaust smell
What to check
- Read DTCs and freeze-frame data; note misfire counts and related codes (P03xx range)
- Check fuel pump fuse, relay and listen for pump prime with key ON
- Measure fuel rail pressure at key ON and while cranking/running
- Scan live data: misfire counters, injector pulse widths, long/short-term fuel trims, fuel rail pressure, crank/cam signals
- Inspect wiring and connectors for injectors, coils, crank/cam sensors and PCM grounds
- Verify injector resistance and operation with a noid light or oscilloscope
Signal parameters
- Cylinder misfire counts (per-cylinder) — expect zero or very low at steady state
- Fuel rail pressure (psi/bar) — should match manufacturer spec at idle and key ON prime
- Injector pulse width (ms) — should be present and vary with RPM/load
- Short-term and long-term fuel trims (%) — large corrections may indicate fueling issue
- Crankshaft sensor signal (frequency/voltage) and camshaft correlation — stable square wave/sinusoidal as specified
- Battery voltage (V) — stable 12–14 V during cranking/running
Diagnostic algorithm
- Retrieve all codes and freeze-frame; prioritize misfire counts and any fuel system codes.
- Verify whether PCM is actively commanding fuel disable (check status flags/logs).
- Confirm fuel pump operation: check fuse/relay, listen for pump prime, measure fuel rail pressure.
- If fuel pressure is low/absent, diagnose fuel supply (pump, relay, filter, pressure regulator, lines).
- Test injector circuits: measure resistance, check continuity to PCM, verify injector pulse with noid light or scope.
- Verify ignition on suspected cylinders: inspect plugs, test coils, check secondary spark under load if safe.
- Check crank and cam sensor signals and timing/chain/belt condition; correct timing faults before further testing.
- Perform compression or leak-down test if mechanical failure is suspected from other tests.
- Repair or replace faulty components; clear codes and perform controlled road test while monitoring misfire counters and fuel status.
- If fueling was disabled by PCM without obvious cause, review PCM software, recent repairs, and manufacturer service info before replacing modules.
Likely causes
- Fuel pump not running or low rail pressure causing PCM to disable fueling
- Injector wiring harness open, shorted, or failed injector preventing fuel delivery
- PCM detected severe misfire and entered fuel-cut strategy to protect catalytic converter
- Ignition coil or spark plug failure causing persistent misfire and fuel disable
- Crank/cam sensor fault or timing loss leading PCM to disable injection
Fault status
Status
Misfire Detected - Fueling Disabled. PCM has detected a misfire condition and disabled or inhibited fuel delivery to protect the engine; further diagnosis required to find root cause.
Repair difficulty: Medium
Diagnostic time: 1.5-4.0 hours
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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.
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