Code
P1325
LEXUS
P — Powertrain
Igniter Circuit Malfunction No 6
Views:
UK: 16
EN: 25
RU: 27
AI status
Completed
Completed
100%
Causes
- Failed ignition coil or igniter module for position No. 6
- Open or shorted wiring in the igniter/coil primary or secondary circuit
- Poor connector contact or corrosion at igniter, coil or ECM connector
- Faulty spark plug (worn, fouled, cracked) causing abnormal load
- Low battery voltage or poor charging system supply
- Faulty engine control module (igniter driver) or internal ECU fault
Symptoms
- Malfunction Indicator Lamp (MIL/Check Engine) illuminated
- Rough idle or intermittent misfire, often localized to cylinder 6
- Loss of power, hesitation or stumbling under load
- Poor fuel economy and increased emissions
- Possible difficulty starting or backfiring
What to check
- Read freeze-frame and stored codes; note any concurrent misfire codes (P0306, P0300)
- Perform a visual inspection of ignition coil/igniter, spark plug and boot at position 6
- Check battery voltage and charging system for adequate supply
- Inspect wiring harness and connectors for damage, corrosion, or loose pins
- Measure coil/igniter connector voltage and ground with a DVOM while cranking
- Swap coil/igniter with a known-good cylinder to see if the fault follows the component
Signal parameters
- Primary coil circuit: pulsed drive voltage from ECM when cranking/running (12 V supply switching to ground)
- Primary waveform: sharp switching edge and a high-voltage spike across coil primary at spark event (verify with scope)
- Secondary waveform: high-voltage pulse and normal ringing after spark if plug fires
- Continuity: no open between igniter coil connector pins and ECM pins (check per OEM pinout)
- Resistance: coil primary/secondary resistances should fall within OEM specification (consult service manual)
Diagnostic algorithm
- Confirm P1325 is current or pending; record freeze-frame data and any related codes (e.g., P0306).
- Visually inspect coil, igniter, plug, wiring harness and connectors for damage, corrosion, burns or oil intrusion at position 6.
- Check battery voltage and charging system — low voltage can cause false ignition faults.
- With ignition OFF, disconnect coil/igniter connector and inspect terminals; repair any bent pins or corrosion.
- With a DVOM or scope, check for proper supply voltage and ground at the igniter connector while cranking and while engine running.
- Measure coil primary and secondary resistance and compare to OEM specifications; note that values vary by model — consult manual.
- Swap the igniter/coil assembly between cylinder 6 and another cylinder. If the code follows the component, replace the faulty component.
- If swapping does not move the code, trace and repair wiring between the igniter and the ECM (check continuity and shorts to battery/ground).
- Use an oscilloscope to compare primary/secondary waveforms from cylinder 6 to a known-good cylinder to identify weak or missing pulses.
- If wiring, connector and components check OK but fault remains, test or replace the ECM/igniter driver per manufacturer procedures.
- After repairs, clear codes and road-test to verify the fault does not return and that engine runs smoothly.
Likely causes
- Igniter (ignition amplifier) failure at cylinder/position 6
- Damaged or loose harness/connector to the igniter or ignition coil
- Defective ignition coil secondary or primary winding
- Faulty spark plug or spark plug boot causing short to ground
- Intermittent ground or power supply to igniter (battery/charging)
Fault status
Status
ECM detected an abnormal condition in the ignition/igniter circuit for igniter number 6 and set P1325. Possible causes include a failed igniter/coil, wiring/connector fault, or poor supply/ground. Inspect ignition components and wiring; replace or repair as necessary.
Repair difficulty: Medium
Diagnostic time: 0.5-2.5 hours
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