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DTC P1505/17913: TP SWITCH CIRCUIT FAILURE Audi A4 B5 facelift

Testing & Diagnostics ~303 words
  1. Inspect Throttle Valve Control Module (TVCM) 8-pin connector for looseness and/or corrosion. Repair connector as necessary. If connector was okay, go to next step. If connector was repaired, erase DTC memory. See CLEARING CODES in SELF-DIAGNOSTICS - INTRODUCTION article.
  2. Turn ignition off. Disconnect TVCM 8-pin connector. Turn ignition on. Using DVOM, check resistance between specified terminals: TVCM connector terminals No. 3 and 7. TVCM connector terminals No. 4 and 7. Voltage should be 9-14.5 volts for first measurement. Voltage should be 4-6 volts for second measurement. If voltage is within specification, erase DTC memory. See CLEARING CODES in SELF-DIAGNOSTICS - INTRODUCTION article. If voltage is not within specification, go to next step.
  3. Turn ignition off. Disconnect Powertrain Control Module (PCM) connectors. Connect VAG 1598/22 test box to PCM wiring harness. Using DVOM, check resistance between TVCM connector terminals and specified test box sockets: TVCM connector terminal No. 3 and test box socket 69. TVCM connector terminal No. 4 and test box socket 62. TVCM connector terminal No. 7 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 open wiring harness as necessary. Erase DTC memory. See CLEARING CODES in SELF-DIAGNOSTICS - INTRODUCTION article.
  4. Using DVOM, check resistance between TVCM connector terminals and specified test box sockets: TVCM connector terminal No. 7 and test box socket 69. TVCM connector terminal No. 7 and test box socket 62. TVCM connector terminal No. 4 and test box socket 67. Resistance should be infinity. If resistance is infinity, replace faulty PCM. See PCM REPLACEMENT in SELF-DIAGNOSTICS - INTRODUCTION article. If resistance is not infinity, repair short in wiring harness as necessary. Erase DTC memory. See CLEARING CODES in SELF-DIAGNOSTICS - INTRODUCTION article.

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