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Home › Saab › 2001 › 9-5 Base, 4D Sedan, Automatic › Repair and Diagnosis › Engine Performance › System › Engine Controls - Self-Diagnostics › Fault Code Diagnosis › P0327: Knock Sensor Circuit. Low Input, Bank 1 › Fault Isolation Procedure

Fault Isolation Procedure

  1. Checking the control module's signal input:
    • Turn the ignition switch to the ON position.
    • Unplug the connector: Ignition discharge module (346). (V6 - Bank 1, 346R)
    • Take a voltage reading: 346:6 and 346:7. (V6 - 346R:6 and 346R:7)
    If the reading shows 4.9-5.1 volts, go to step  3, otherwise go to next step.
  2. Rectifying the lead: The lead from pin 7 of the female connector to pin 38 of the control module is faulty. Rectify the fault and go to step  4.
  3. Changing components: Change ignition discharge module (Bank 1). When finished, go to next step.
  4. Final check:
    • Clear the DTCs in all systems.
    • Carry out a drive cycle: Drive the car at varying engine loads and engine RPM for 5 minutes.
    • Evaluate the drive cycle: Check that the DTC has not recurred.
    If the trouble code has recurred, the ECM is probably at fault and will need replacement. Replace with known-good ECM and retest. if no DTCs are present, then the steps taken to rectify the fault were correct.
Fig 1: Knock Sensor Circuit (4-Cyl)
G00207357Courtesy of SAAB-SCANIA OF AMERICA, INC.
Fig 2: Knock Sensor Circuit (V6)
G00207413Courtesy of SAAB-SCANIA OF AMERICA, INC.
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