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1. Check ECM ground and power supply. See ECM GROUND & VOLTAGE SUPPLY under ENGINE CONTROL MODULE (J220) - ME SFI CONTROL MODULE. If ECM ground and voltage supply are 2. Replace ECM with known-good unit. Before disconnecting Engine Control Module (ECM - J220) record code and identification number from ECM that is to be replaced. See ECM CODING . Go to next step. 3. To remove ECM see specific model below: z Beetle z GTI & Jetta z Passat 4. After installing ECM perform following procedures: z Use scan tool to code new ECM. See ENGINE CONTROL MODULE (J220) CODING . z Use scan tool to check DTC memory, erase if necessary. See CLEARING DIAGNOSTIC z Perform adaptation of throttle valve control module. See THROTTLE VALVE CONTROL z On vehicles equipped with cruise control, activate cruise control to ECM. See z On vehicles equipped with A/T, perform adaptation of A/T to basic setting. See A/T BASIC z On vehicles equipped with A/T, perform adaptation of kickdown switch. See ADAPTING z On vehicles equipped with factory alarm system, perform adaptation of immobilizer to ECM. See z Perform idle check. See IDLE CHECK . z Generate ECM readiness code. See READINESS CODE . DTC P1648/18056: DRIVETRAIN DATA BUS MALFUNCTION NOTE: If a test ends with ECM replacement. Before replacing ECM be certain that, all
2003 Volkswagen New Beetle GLS 2002-2003 ENGINE PERFORMANCE Self-Diagnostics - 1.8L Turbo
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