P1382

Code

MAZDA P — Powertrain

Camshaft Position Timing Solenoid 1 Circuit

Brand: MAZDA

Type: P — Powertrain

Views: UK: 38 EN: 73 RU: 49

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Open or short in solenoid wiring (broken wire, chafing, corroded pin)
Poor connector contact (corrosion, bent pin, water intrusion)
Faulty camshaft timing (VVT) solenoid/actuator #1
Low engine oil level, dirty oil, or wrong oil viscosity preventing solenoid operation
Faulty ECM or internal driver circuit
Intermittent connection due to vibration or heat

Scan for stored/freeze-frame data and pending codes; confirm P1382 is current
Inspect engine oil level and condition; change oil if contaminated or over service interval
Visually inspect solenoid connector and wiring for damage, corrosion, or loose pins
Back-probe solenoid connector to check supply voltage and ground while key ON
Measure solenoid coil resistance with a multimeter (compare to spec)
Use live data to monitor camshaft position, commanded solenoid duty, and response

Supply voltage at connector: battery voltage (~11–14 V) on feed circuit with key ON (verify)
Control signal: ECM typically provides a PWM signal; frequency range often 20–200 Hz depending on engine (consult service manual)
Expected solenoid coil resistance: commonly ~6–30 ohms (varies by model) — check workshop spec
When commanded ON the ECM will vary duty cycle; oscilloscope should show clean square/PWM waveform without excessive noise
No continuity to ground on feed wire (when not commanded) and no short to battery or ground on control circuit

Retrieve codes and freeze-frame data with a scanner; clear code and attempt to re-run to confirm repeatability.
Check engine oil level and condition; top up or change oil if low/dirty. Low oil can prevent VVT operation and mimic electrical faults.
Visually inspect the camshaft timing solenoid #1 connector and harness for damage, corrosion, melted insulation, or oil intrusion.
With ignition ON (engine OFF) back-probe the connector: verify battery feed voltage on the power terminal and check the control terminal for voltage or PWM when commanded by a scanner.
Measure solenoid coil resistance at the connector or removed solenoid. Compare to Mazda spec. Replace solenoid if resistance is out of range or shows intermittent values.
Wiggle-test wiring/harness and connector while monitoring scanner or DVM to detect intermittent opens/shorts.
If supply and coil check OK but control remains abnormal, use an oscilloscope to inspect ECM output (PWM waveform). Look for missing pulses, stuck voltage, or noise.
If ECM driver appears faulty (no PWM when commanded but wiring and solenoid are good), perform a substitute known-good solenoid or consult service bulletin before replacing ECM.
After repair or part replacement, clear codes and perform drive cycle or regeneration procedure required to confirm the fault does not return.

Damaged harness at valve cover or near timing cover where wires are routed
Oil-soaked or corroded solenoid connector causing high resistance
Solenoid coil shorted internally after contamination
Low oil pressure (blocked oil passages or worn oil pump) preventing valve movement
Aftermarket/incorrect replacement part with wrong resistance or wiring

⚠️ Status

Camshaft Position Timing Solenoid 1 Circuit — ECM detected an electrical fault (open/short/intermittent) in the camshaft timing solenoid #1 circuit.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours

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P1382 — Camshaft Position Timing Solenoid 1 Circuit