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Home >> Audi >> 1996 >> A4 Base, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - 2.8L >> Circuit Tests >> DTC P0327/16711 - Knock Sensor No. 1 Circuit Low Input (Bank 1 Or Single Sensor)

DTC P0327/16711 - Knock Sensor No. 1 Circuit Low Input (Bank 1 Or Single Sensor)

NOTE: DTC is set if knock sensor output voltage is less than .2 volts, coolant temperature more than 68°F (20°C), engine speed more than 3500 RPM and engine load more than 16 percent. Ignition timing will be retarded 12° according to ignition map in PCM.
  1. If DTC P0332/16716 KNOCK SENSOR NO. 2 CIRCUIT LOW INPUT (BANK 2) is also set in memory, perform test steps 2)-8), then continue and perform test steps 9)-15). If DTC P0332/16716 KNOCK SENSOR NO. 2 CIRCUIT LOW INPUT (BANK 2) is not also set in memory, perform test steps 2)-8) only. Go to next step.
  2. Inspect knock sensor No. 1 connector for looseness and/or corrosion. Knock sensor No. 1 is located on passenger side of engine under intake manifold. Repair sensor connector as necessary. If sensor connector was not repaired, go to next step. If sensor connector was repaired, erase DTC memory and test drive vehicle.
  3. Inspect knock sensor No. 1 for loose mounting to engine. Using Insert (3247), torque knock sensor No. 1 to 15 ft. lbs. (20 N.m) if necessary. If knock sensor No. 1 mounting was okay, go to next step. If knock sensor No. 1 mounting was repaired, erase DTC memory and test drive vehicle.
  4. Disconnect knock sensor No. 1 3-pin connector. Using a DVOM, check all 3 terminals in knock sensor No. 1 connector (sensor side) for shorting to each other. If a short circuit is not present, go to next step. If a short circuit is present, replace knock sensor No. 1. Erase DTC memory and test drive vehicle.
  5. Turn ignition off. Disconnect Powertrain Control Module (PCM) connectors. Connect VAG 1598/19 test box to PCM wiring harness. Terminal assignments of test box are identical to PCM connectors "A", "B", "C", "D" and "E".
  6. Using DVOM, check resistance between knock sensor No. 1 connector (harness side) terminal No. 1 and test box socket A13. Maximum resistance is one ohm. If resistance is within specification, go to next step. If resistance is not within specification, repair open or short circuit. Erase DTC memory and test drive vehicle. If an open or short circuit cannot be located, replace faulty PCM. Code new PCM and test drive vehicle. See PCM CODING  in this article.
  7. Using DVOM, check resistance between knock sensor No. 1 connector (harness side) terminal No. 2 and test box socket A14. Maximum resistance is one ohm. If resistance is within specification, go to next step. If resistance is not within specification, repair open or short circuit. Erase DTC memory and test drive vehicle. If an open or short circuit cannot be located, replace faulty PCM. Code new PCM and test drive vehicle. See PCM CODING in this article.
  8. Using DVOM, check resistance between knock sensor No. 1 connector (harness side) terminal No. 3 and engine ground. Maximum resistance is one ohm. If resistance is within specification, circuit is okay. Erase DTC memory and test drive vehicle. If resistance is not within specification, repair open or short circuit. Erase DTC memory and test drive vehicle. If an open or short circuit cannot be located, replace faulty PCM. Code new PCM and test drive vehicle. See PCM CODING  in this article.
  9. Inspect knock sensor No. 2 connector for looseness and/or corrosion. Knock sensor No. 2 is located on driver side of engine under intake manifold. Repair sensor connector as necessary. If sensor connector was not repaired, go to next step. If sensor connector was repaired, erase DTC memory and test drive vehicle.
  10. Inspect knock sensor No. 2 for loose mounting to engine. Using Insert (3247), torque knock sensor No. 2 to 15 ft. lbs. (20 N.m) if necessary. If knock sensor No. 2 mounting was okay, go to next step. If knock sensor No. 2 mounting was repaired, erase DTC memory and test drive vehicle.
  11. Disconnect knock sensor No. 2 3-pin connector. Using a DVOM, check all 3 terminals in knock sensor No. 2 connector (sensor side) for shorting to each other. If a short circuit is not present, go to next step. If a short circuit is present, replace knock sensor No. 2. Erase DTC memory and test drive vehicle.
  12. Using VAG 1598/19 test box connected to PCM wiring harness, check knock sensor No. 2 harness. Terminal assignments of test box are identical to PCM connectors "A", "B", "C", "D" and "E".
  13. Using DVOM, check resistance between knock sensor No. 2 connector (harness side) terminal No. 1 and test box socket A15. Maximum resistance is one ohm. If resistance is within specification, go to next step. If resistance is not within specification, repair open or short circuit. Erase DTC memory and test drive vehicle. If an open or short circuit cannot be located, replace faulty PCM. Code new PCM and test drive vehicle. See PCM CODING  in this article.
  14. Using DVOM, check resistance between knock sensor No. 2 connector (harness side) terminal No. 2 and test box socket A14. Maximum resistance is one ohm. If resistance is within specification, go to next step. If resistance is not within specification, repair open or short circuit. Erase DTC memory and test drive vehicle. If an open or short circuit cannot be located, replace faulty PCM. Code new PCM and test drive vehicle. See PCM CODING  in this article.
  15. Using DVOM, check resistance between knock sensor No. 2 connector (harness side) terminal No. 3 and engine ground. Maximum resistance is one ohm. If resistance is within specification, circuit is okay. Erase DTC memory and test drive vehicle. If resistance is not within specification, repair open or short circuit. Erase DTC memory and test drive vehicle. If an open or short circuit cannot be located, replace faulty PCM. Code new PCM and test drive vehicle. Refer to PCM CODING  in this article.
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