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Engine Controls - Self-Diagnostics - 2.8L: Other Audi A4 B5 facelift

Testing & Diagnostics ~1427 words

Knock Sensor No. 1

  1. Inspect knock sensor 3-pin connector for looseness and/or corrosion. Knock sensor No. 1 is located at right side of engine, under intake manifold near front of engine. Repair sensor connector as necessary. If sensor connector was not repaired, go to next step. If connector was repaired, erase DTC memory. See CLEARING CODES in SELF-DIAGNOSTICS - INTRODUCTION article.
  2. Turn ignition off. Disconnect engine speed sensor 3-pin connector. Using DVOM, check resistance between specified knock sensor 3-pin connector (sensor side) terminals. Knock sensor terminals No. 1 and 2. Knock sensor terminals No. 1 and 3. Knock sensor terminals No. 2 and 3. Resistance should be infinity. If resistance is infinity, go to next step. If resistance is not infinity, replace knock sensor. Erase DTC memory. See CLEARING CODES in SELF-DIAGNOSTICS - INTRODUCTION article.
  3. Disconnect Powertrain Control Module (PCM) connectors. Connect VAG 1598/22 test box to PCM wiring harness. Using DVOM, check resistance between knock sensor connector (harness side) terminals and specified test box sockets: Knock sensor connector terminal No. 1 and test box socket 68. Knock sensor connector terminal No. 2 and test box socket 67. Knock sensor connector terminal No. 3 and test box socket 67. Resistance should be 1.5 ohms or less. If resistance is within specification, go to next step. If resistance is not within specification, repair wiring harness open as necessary. Erase DTC memory. See CLEARING CODES in SELF-DIAGNOSTICS - INTRODUCTION article.
  4. Using DVOM, check resistance between knock sensor connector (harness side) terminals and specified test box sockets: Knock sensor connector terminal No. 2 and test box socket 68. Knock sensor connector terminal No. 3 and test box socket 68. Resistance should be infinity. If resistance is infinity, go to next step. If resistance is not infinity, repair wiring harness short as necessary. Erase DTC memory. See CLEARING CODES in SELF-DIAGNOSTICS - INTRODUCTION article.
  5. Loosen knock sensor No. 1 and re-tighten to 15 ft. lbs. (20 N.m). Erase DTC memory. See CLEARING CODES in SELF-DIAGNOSTICS - INTRODUCTION article. If DTC is still in memory, replace faulty knock sensor No. 1. Erase DTC memory. See CLEARING CODES in SELF-DIAGNOSTICS - INTRODUCTION article.

Knock Sensor No. 2

  1. Inspect knock sensor 3-pin connector for looseness and/or corrosion. Knock sensor No. 2 is located at left side of engine, under intake manifold near rear of engine. Repair sensor connector as necessary. If sensor connector was not repaired, go to next step. If connector was repaired, erase DTC memory. See CLEARING CODES in SELF-DIAGNOSTICS - INTRODUCTION article.
  2. Turn ignition off. Disconnect engine speed sensor 3-pin connector. Using DVOM, check resistance between specified knock sensor 3-pin connector (sensor side) terminals. Knock sensor terminals No. 1 and 2. Knock sensor terminals No. 1 and 3. Knock sensor terminals No. 2 and 3. Resistance should be infinity. If resistance is infinity, go to next step. If resistance is not infinity, replace knock sensor. Erase DTC memory. See CLEARING CODES in SELF-DIAGNOSTICS - INTRODUCTION article.
  3. Disconnect Powertrain Control Module (PCM) connectors. Connect VAG 1598/22 test box to PCM wiring harness. Using DVOM, check resistance between knock sensor connector (harness side) terminals and specified test box sockets: Knock sensor connector terminal No. 1 and test box socket 60. Knock sensor connector terminal No. 2 and test box socket 67. Knock sensor connector terminal No. 3 and test box socket 67. Resistance should be 1.5 ohms or less. If resistance is within specification, go to next step. If resistance is not within specification, repair wiring harness open as necessary. Erase DTC memory. See CLEARING CODES in SELF-DIAGNOSTICS - INTRODUCTION article.
  4. Using DVOM, check resistance between knock sensor connector (harness side) terminals and specified test box sockets: Knock sensor connector terminal No. 2 and test box socket 60. Knock sensor connector terminal No. 3 and test box socket 60. Resistance should be infinity. If resistance is infinity, go to next step. If resistance is not infinity, repair wiring harness short as necessary. Erase DTC memory. See CLEARING CODES in SELF-DIAGNOSTICS - INTRODUCTION article.
  5. Loosen knock sensor No. 2 and re-tighten to 15 ft. lbs. (20 N.m). Erase DTC memory. See CLEARING CODES in SELF-DIAGNOSTICS - INTRODUCTION article. If DTC is still in memory, replace faulty knock sensor No. 2. Erase DTC memory. See CLEARING CODES in SELF-DIAGNOSTICS - INTRODUCTION article.
  1. Inspect knock sensor 3-pin connector for looseness and/or corrosion. Knock sensor No. 1 is located at right side of engine, under intake manifold near front of engine. Repair sensor connector as necessary. If sensor connector was not repaired, go to next step. If connector was repaired, erase DTC memory. See CLEARING CODES in SELF-DIAGNOSTICS - INTRODUCTION article.
  2. Turn ignition off. Disconnect engine speed sensor 3-pin connector. Using DVOM, check resistance between specified knock sensor 3-pin connector (sensor side) terminals. Knock sensor terminals No. 1 and 2. Knock sensor terminals No. 1 and 3. Knock sensor terminals No. 2 and 3. Resistance should be infinity. If resistance is infinity, go to next step. If resistance is not infinity, replace knock sensor. Erase DTC memory. See CLEARING CODES in SELF-DIAGNOSTICS - INTRODUCTION article.
  3. Disconnect Powertrain Control Module (PCM) connectors. Connect VAG 1598/22 test box to PCM wiring harness. Using DVOM, check resistance between knock sensor connector (harness side) terminals and specified test box sockets: Knock sensor connector terminal No. 1 and test box socket 68. Knock sensor connector terminal No. 2 and test box socket 67. Knock sensor connector terminal No. 3 and test box socket 67. Resistance should be 1.5 ohms or less. If resistance is within specification, go to next step. If resistance is not within specification, repair wiring harness open as necessary. Erase DTC memory. See CLEARING CODES in SELF-DIAGNOSTICS - INTRODUCTION article.
  4. Using DVOM, check resistance between knock sensor connector (harness side) terminals and specified test box sockets: Knock sensor connector terminal No. 2 and test box socket 68. Knock sensor connector terminal No. 3 and test box socket 68. Resistance should be infinity. If resistance is infinity, go to next step. If resistance is not infinity, repair wiring harness short as necessary. Erase DTC memory. See CLEARING CODES in SELF-DIAGNOSTICS - INTRODUCTION article.
  5. Loosen knock sensor No. 1 and re-tighten to 15 ft. lbs. (20 N.m). Erase DTC memory. See CLEARING CODES in SELF-DIAGNOSTICS - INTRODUCTION article. If DTC is still in memory, replace faulty knock sensor No. 1. Erase DTC memory. See CLEARING CODES in SELF-DIAGNOSTICS - INTRODUCTION article.
  1. Inspect knock sensor 3-pin connector for looseness and/or corrosion. Knock sensor No. 2 is located at left side of engine, under intake manifold near rear of engine. Repair sensor connector as necessary. If sensor connector was not repaired, go to next step. If connector was repaired, erase DTC memory. See CLEARING CODES in SELF-DIAGNOSTICS - INTRODUCTION article.
  2. Turn ignition off. Disconnect engine speed sensor 3-pin connector. Using DVOM, check resistance between specified knock sensor 3-pin connector (sensor side) terminals. Knock sensor terminals No. 1 and 2. Knock sensor terminals No. 1 and 3. Knock sensor terminals No. 2 and 3. Resistance should be infinity. If resistance is infinity, go to next step. If resistance is not infinity, replace knock sensor. Erase DTC memory. See CLEARING CODES in SELF-DIAGNOSTICS - INTRODUCTION article.
  3. Disconnect Powertrain Control Module (PCM) connectors. Connect VAG 1598/22 test box to PCM wiring harness. Using DVOM, check resistance between knock sensor connector (harness side) terminals and specified test box sockets: Knock sensor connector terminal No. 1 and test box socket 60. Knock sensor connector terminal No. 2 and test box socket 67. Knock sensor connector terminal No. 3 and test box socket 67. Resistance should be 1.5 ohms or less. If resistance is within specification, go to next step. If resistance is not within specification, repair wiring harness open as necessary. Erase DTC memory. See CLEARING CODES in SELF-DIAGNOSTICS - INTRODUCTION article.
  4. Using DVOM, check resistance between knock sensor connector (harness side) terminals and specified test box sockets: Knock sensor connector terminal No. 2 and test box socket 60. Knock sensor connector terminal No. 3 and test box socket 60. Resistance should be infinity. If resistance is infinity, go to next step. If resistance is not infinity, repair wiring harness short as necessary. Erase DTC memory. See CLEARING CODES in SELF-DIAGNOSTICS - INTRODUCTION article.
  5. Loosen knock sensor No. 2 and re-tighten to 15 ft. lbs. (20 N.m). Erase DTC memory. See CLEARING CODES in SELF-DIAGNOSTICS - INTRODUCTION article. If DTC is still in memory, replace faulty knock sensor No. 2. Erase DTC memory. See CLEARING CODES in SELF-DIAGNOSTICS - INTRODUCTION article.

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