DTC P0325 (KNOCK) - KNOCK SENSOR CIRCUIT MALFUNCTION Subaru Impreza GC/GF

Note. Refer to illustration for connector and terminal identification. (Схема №11)- (Схема №29).

1. Turn ignition to OFF. Disconnect ECM connector. Measure resistance between ECM connector E29, terminal No. 30 and ground. If resistance is 700 k/ohms or more, go to next step. If resistance is less than 400 k/ohms, go to step 3). If resistance is 400-700 k/ohms, go to step 4).
2. Disconnect connector from knock sensor. Measure resistance between knock sensor connector E37, terminal No. 1 and ground. If resistance is less than 700 k/ohms, check and repair for open in harness between knock sensor connector and ECM connector, poor contact of knock sensor connector or poor contact in coupling E21, between knock sensor and ECM. If resistance is 700 k/ohms or more, ensure knock sensor installation bolt is secure. If installation bolt is loose, tighten securely. If installation bolt is secure, replace knock sensor.
3. Disconnect connector from knock sensor. Measure resistance of harness between knock sensor connector E37, terminal No. 1 and ground. If resistance is 400 k/ohms or less, replace knock sensor. If resistance is more than 400 k/ohms, repair short in harness between knock sensor connector and ECM connector. NOTE: Harness between both connectors is shielded. Repair short circuit of harness together with shield.
4. Connect ECM and knock connectors. Turn ignition to ON. Measure voltage between ECM connector E29, terminal No. 30 and ground. If voltage is less than 2 volts, repair poor contact in ECM connector. If voltage is 2 volts or more, circuit has returned to normal. Check for and repair any poor contact at knock sensor connector, ECM connector and coupling connector E21, between knock sensor and ECM.