Code
P1341
JAGUAR
P — Powertrain
Camshaft Position Sensor B Circuit Range Performance
AI status
Completed
Completed
100%
Causes
- Failed or degraded camshaft position sensor B
- Damaged, corroded or loose connector or wiring (open, short to ground or battery)
- Poor sensor reference/ground or missing 5V reference (if Hall-effect type)
- Faulty reluctor/target wheel or magnetic debris on reluctor
- Timing chain/belt jumped or cam timing out of specification
- ECM/PCM fault or internal input circuit failure
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated (check engine light)
- Rough idle, hesitation or stalling
- Poor acceleration or reduced engine power (limp mode possible)
- Hard starting or no-start in some cases
- Random or persistent misfire(s) and degraded fuel economy
- Stored or pending DTCs related to cam/crank correlation
What to check
- Read and record freeze-frame data and all stored/related DTCs with a scan tool
- Compare live camshaft position B signal to camshaft A and crankshaft sensor data while cranking/at idle and under rev
- Visually inspect sensor B connector and wiring for corrosion, damage, loose pins, or water intrusion
- Wiggle harness while monitoring data for intermittent faults
- Check for proper reference voltage (commonly 5 V for Hall sensors) and ground at the sensor connector
- Measure sensor signal with an oscilloscope (preferred) or multimeter (AC for VR sensors) while cranking and running
Signal parameters
- Typical Hall-effect sensor: digital square wave approximately 0–5 V (switching between ~0.5 V and ~4.5 V) with frequency proportional to engine speed; duty cycle varies with tooth spacing
- Typical VR (variable reluctance) sensor: AC waveform amplitude rising with engine speed — low tens to hundreds of millivolts at idle up to volts at higher RPM
- At idle expect low-frequency pulses; at higher RPM frequency increases linearly with engine speed
- Compare waveform timing and phase of Cam B to Cam A and crank sensor — cam events should align with expected crank-to-cam correlation
Diagnostic algorithm
- Retrieve and record all DTCs, freeze-frame and live data. Clear codes and attempt to re-run to confirm repeatability.
- Visually inspect sensor B connector, pins and harness for damage, corrosion, loose or pushed-out pins. Repair as needed.
- Backprobe sensor connector: verify reference voltage (typically ~5 V for Hall sensors), ground continuity, and measure signal while cranking/running. For VR sensors measure AC output.
- Use an oscilloscope to capture Cam B waveform; compare to Cam A and crank waveforms. Look for missing pulses, irregular amplitude, abnormal noise or incorrect phase.
- If no electrical fault found, inspect reluctor/target wheel and sensor air gap; correct gap per spec and inspect for debris or damage.
- Check mechanical timing: verify timing chain/belt alignment and cam/crank timing marks. Repair mechanical timing faults if found.
- Perform wiring resistance and short-to-ground/battery checks between sensor and ECU connector (with ignition off). Repair any faults.
- If sensor fails bench/oscilloscope tests or replacement is the only remaining suspect, replace camshaft position sensor B using OEM-specified part.
- After repair, clear codes and confirm symptom resolution with road or dyno test and re-check for reappearance of DTCs.
Likely causes
- Faulty camshaft position sensor B
- Connector corrosion or bent pins at sensor or ECU
- Broken or shorted signal/reference/ground wire in harness
- Timing chain/belt jump or worn timing components causing unexpected cam position
- Contaminated/damaged reluctor wheel or reluctor-to-sensor air gap out of spec
Fault status
Status
P1341 — Camshaft Position Sensor B Circuit Range/Performance detected. ECM has seen the cam B signal outside expected parameters. Check sensor, wiring, and cam/crank timing.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
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