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Home >> Subaru >> 2001 >> Outback Base, Standard >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Controls - Self-Diagnostics - 2.2L & 2.5L >> Diagnostic Tests >> DTC P1325: Knock Sensor (KS) Circuit Low Input - Forester & IMPREZA 2.5L

DTC P1325: Knock Sensor (KS) Circuit Low Input - Forester & IMPREZA 2.5L

  1. Perform basic diagnostic procedure. See BASIC DIAGNOSTIC PROCEDURE . Turn ignition off. Disconnect ECM connector B136 (30-pin connector). Using an ohmmeter connected to ground, measure resistance at ECM connector B136 (30-pin connector) terminal No. 4. See Figure. If resistance is more than 700 k/ohms, go to step  3. If resistance is not more than 700 k/ohms, leave ohmmeter connected and go to next step.
  2. Measure resistance between ECM connector B136 (30-pin connector) terminal No. 4 and chassis ground. If resistance is less than 400 k/ohms, go to step  5. If resistance is not less than 400 k/ohms, go to step  6.
  3. Disconnect KS connector. Measure resistance between KS connector terminal No. 2 and engine ground. See Figure. If resistance is more than 700 k/ohms, go to next step. If resistance is not more than 700 k/ohms, locate and repair open in wiring and check for poor terminal contact in connectors between ECM and KS. See WIRING DIAGRAMS article.
  4. Ensure KS is installed tightly. Tighten bolt as necessary. If bolt is tight, replace KS.
  5. Disconnect KS connector. Measure resistance between KS connector terminal No. 2 and engine ground. If resistance is less than 400 k/ohms, replace KS. If resistance is not less than 400 k/ohms, locate and repair short to ground in wiring between ECM and KS.
    NOTE: Wiring between both connectors is shielded. Repair circuit in wiring together with shield.
  6. Reconnect ECM and KS connectors. Turn ignition on. Using DVOM connected to ground, backprobe ECM connector B136 (30-pin connector) terminal No. 4. If voltage is more than 2 volts, system has returned to normal. Check for poor terminal contact in connectors between ECM and KS. If voltage is not more than 2 volts, repair poor terminal contact at ECM connector. Clear memory and perform verification procedure. See CLEARING DIAGNOSTIC TROUBLE CODES  and VERIFICATION PROCEDURE  .
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