Code
P02B3
Generic
P — Powertrain
Cylinder 7 - Fuel Trim at Min Limit
Views:
UK: 24
EN: 31
RU: 17
AI status
Completed
Completed
100%
Causes
- Stuck-open or leaking fuel injector on cylinder 7
- Shorted/directly energized injector wiring or injector driver fault
- Excessive fuel pressure or faulty fuel pressure regulator
- Fuel rail leak localized to cylinder 7 circuit
- Intake manifold leak or coolant/injection of fuel into intake at cylinder 7
- Faulty cylinder-specific sensors (crank/cam signal affecting timing for cylinder 7)
Symptoms
- Check Engine Light with P02B3 stored
- Rough idle or vibration, especially pronounced at idle
- Poor fuel economy and strong fuel smell
- Black exhaust smoke under load (rich condition)
- Misfire detected on cylinder 7 (may generate P0307)
- Reduced engine performance or hesitation
What to check
- Retrieve freeze frame and live data with a scan tool; note engine conditions when the code set
- Monitor cylinder-specific fuel trim (CSFT), short-term (STFT) and long-term fuel trim (LTFT) for all cylinders/banks
- Compare CSFT for cylinder 7 against other cylinders — look for a large negative deviation
- Check misfire counters and O2 sensor voltages/response
- Inspect fuel injector connector and wiring for cylinder 7 for corrosion, pin damage, or short to ground/power
- Perform a visual and pressure test of the fuel rail; check fuel pressure at idle and during a load test
Signal parameters
- Cylinder-specific fuel trim (CSFT) — flagged when at or below ECU minimum limit (commonly near -20% to -30%, varies by manufacturer)
- Short-term fuel trim (STFT) and long-term fuel trim (LTFT) for the affected bank
- Injector pulse width for cylinder 7 (milliseconds)
- Fuel rail pressure (psi or bar) at idle and under load
- O2 sensor voltage and response time (0.1–0.9 V typical range)
- Misfire counter for cylinder 7 (counts per minute)
Diagnostic algorithm
- Connect a capable scan tool and record live data: CSFT, STFT, LTFT, injector pulse width, fuel rail pressure, O2 voltage, and misfire counts
- Verify the code is active by recreating conditions shown in freeze frame (engine at same temp/load/RPM)
- Visually inspect and backprobe the injector connector for cylinder 7; check for proper injector driver PWM/noid signal and compare pulse width to other cylinders
- Swap the injector from cylinder 7 with another cylinder and see if the fault and symptoms follow the injector (use same engine conditions)
- If swap moves the issue, replace the injector; if it stays on cylinder 7, suspect wiring/ECU/engine mechanical issue
- Perform an injector leak/flow test or ultrasonic cleaning and bench flow test if contamination suspected
- Check fuel pressure and regulator operation; confirm pressure is within spec and there is no over-pressurization
- Perform compression or leak-down test on cylinder 7 to rule out mechanical causes (valve, piston)
- Smoke-test intake manifold and gasket seating near cylinder 7 for leaks that could affect local fuel mixture
- Inspect and test related sensors (MAF/MAP, O2) only after cylinder-specific causes are addressed; replace as indicated
- Clear codes and perform a road/test cycle to verify repair; monitor trims to confirm CSFT returns to normal range
Likely causes
- Leaking or stuck-open injector for cylinder 7
- Wiring fault/noid signal causing injector to be energized incorrectly
- High fuel rail pressure or leaking regulator causing overfueling
- Injector partially clogged and spraying unevenly (creating local rich condition)
Fault status
Status
Cylinder 7 fuel trim reached minimum correction limit — PCM is at its lower limit for reducing fuel for that cylinder.
Repair difficulty: Medium
Diagnostic time: 1.5-3.5 hours
Workshop Manuals
Available brands with manuals
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LAND ROVER 3
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Code
P02B3
LAND ROVER
P — Powertrain
cylinder balance 7 - fuel compensation at its limit minimum
Views:
UK: 7
EN: 9
RU: 7
AI status
Completed
Completed
100%
Causes
- Stuck-open or leaking fuel injector on cylinder 7
- Shorted/directly energized injector wiring or injector driver fault
- Excessive fuel pressure or faulty fuel pressure regulator
- Fuel rail leak localized to cylinder 7 circuit
- Intake manifold leak or coolant/injection of fuel into intake at cylinder 7
- Faulty cylinder-specific sensors (crank/cam signal affecting timing for cylinder 7)
Symptoms
- Check Engine Light with P02B3 stored
- Rough idle or vibration, especially pronounced at idle
- Poor fuel economy and strong fuel smell
- Black exhaust smoke under load (rich condition)
- Misfire detected on cylinder 7 (may generate P0307)
- Reduced engine performance or hesitation
What to check
- Retrieve freeze frame and live data with a scan tool; note engine conditions when the code set
- Monitor cylinder-specific fuel trim (CSFT), short-term (STFT) and long-term fuel trim (LTFT) for all cylinders/banks
- Compare CSFT for cylinder 7 against other cylinders — look for a large negative deviation
- Check misfire counters and O2 sensor voltages/response
- Inspect fuel injector connector and wiring for cylinder 7 for corrosion, pin damage, or short to ground/power
- Perform a visual and pressure test of the fuel rail; check fuel pressure at idle and during a load test
Signal parameters
- Cylinder-specific fuel trim (CSFT) — flagged when at or below ECU minimum limit (commonly near -20% to -30%, varies by manufacturer)
- Short-term fuel trim (STFT) and long-term fuel trim (LTFT) for the affected bank
- Injector pulse width for cylinder 7 (milliseconds)
- Fuel rail pressure (psi or bar) at idle and under load
- O2 sensor voltage and response time (0.1–0.9 V typical range)
- Misfire counter for cylinder 7 (counts per minute)
Diagnostic algorithm
- Connect a capable scan tool and record live data: CSFT, STFT, LTFT, injector pulse width, fuel rail pressure, O2 voltage, and misfire counts
- Verify the code is active by recreating conditions shown in freeze frame (engine at same temp/load/RPM)
- Visually inspect and backprobe the injector connector for cylinder 7; check for proper injector driver PWM/noid signal and compare pulse width to other cylinders
- Swap the injector from cylinder 7 with another cylinder and see if the fault and symptoms follow the injector (use same engine conditions)
- If swap moves the issue, replace the injector; if it stays on cylinder 7, suspect wiring/ECU/engine mechanical issue
- Perform an injector leak/flow test or ultrasonic cleaning and bench flow test if contamination suspected
- Check fuel pressure and regulator operation; confirm pressure is within spec and there is no over-pressurization
- Perform compression or leak-down test on cylinder 7 to rule out mechanical causes (valve, piston)
- Smoke-test intake manifold and gasket seating near cylinder 7 for leaks that could affect local fuel mixture
- Inspect and test related sensors (MAF/MAP, O2) only after cylinder-specific causes are addressed; replace as indicated
- Clear codes and perform a road/test cycle to verify repair; monitor trims to confirm CSFT returns to normal range
Likely causes
- Leaking or stuck-open injector for cylinder 7
- Wiring fault/noid signal causing injector to be energized incorrectly
- High fuel rail pressure or leaking regulator causing overfueling
- Injector partially clogged and spraying unevenly (creating local rich condition)
Fault status
Status
Cylinder 7 fuel trim reached minimum correction limit — PCM is at its lower limit for reducing fuel for that cylinder.
Repair difficulty: Medium
Diagnostic time: 1.5-3.5 hours
HTML Workshop Manuals AI manual library for LAND ROVER Click to show available manuals 1
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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
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0
Send to email
