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Home >> Subaru >> 1999 >> Forester Base >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Controls - Self-Diagnostics - Forester, IMPREZA 2.2L & 2.5L & Legacy 2.2L >> Diagnostic Tests >> DTC P1325: Knock Sensor (KS) Circuit Low Input - Except IMPREZA & Legacy 2.2L (CALIFORNIA Emissions)

DTC P1325: Knock Sensor (KS) Circuit Low Input - Except IMPREZA & Legacy 2.2L (CALIFORNIA Emissions)

  1. Turn ignition off. Disconnect appropriate ECM connector. Using an ohmmeter, measure resistance between ground and ECM connector B136 terminal No. 4. If resistance is more than 700 k/ohms, go to step  3. If resistance is 700 k/ohms or less, leave ohmmeter connected and go to next step.
  2. If resistance is less than 400 k/ohms, go to step  5. If resistance is 400 k/ohms or more, go to step  6.
  3. Disconnect KS connector. Measure resistance between ground and KS connector terminal No. 2. If resistance is more than 700 k/ohms, go to next step. If resistance is 700 k/ohms or less, repair open in wiring or poor contact between ECM and KS connectors.
  4. Ensure KS is installed tightly. Tighten bolts as necessary. If bolts are tight, replace KS.
    NOTE: Wiring between both connectors is shielded. Repair short circuit in wiring together with shield.
  5. Disconnect KS connector. Measure resistance between KS terminals No. 1 and 2. If resistance is less than 400 ohms, replace KS. If resistance is 400 ohms or more, repair short in wiring between ECM and KS connectors.
  6. Reconnect ECM and KS connectors. Turn ignition on. Using voltmeter connected to ground, backprobe ECM connector B136 connector terminal No. 4. If voltage is more than 2 volts, system has returned to normal. Check for poor contact between ECM and KS connectors. If voltage is 2 volts or less, repair poor contact at ECM.
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