Tiguan 4Motion (5N1) L4-2.0L Turbo (CCTA) (2009)
Specified value: 1.5 ohm or less.
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If fuse is blown, locate short to ground in circuit, refer to wiring diagram.
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Repair as necessary.
If the specified value was obtained:
Checking activation
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Remove the Motronic Engine Control Module (ECM) Power Supply Relay (J271).
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Using a diode test lamp (12 V) connected to Battery +, check the Motronic Engine Control Module (ECM) Power Supply Relay socket 4 (for
relay terminal 85) while cranking the engine.
The test lamp should be on.
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Switch the ignition off.
If the test lamp was ON:
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Replace the Motronic Engine Control Module (ECM) Power Supply Relay (J271): Refer to the Repair Information.
If the test lamp was Not ON:
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Using a multimeter, check the Motronic Engine Control Module (ECM) Power Supply Relay socket 4 (for relay terminal 85), to the Motronic
Engine Control Module (ECM) (J623) electrical harness connector T94 terminal 69 for resistance.
Specified value: 1.5 ohms Max.
If the specified value was Not obtained:
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Check the wiring connection for an open circuit, high resistance or short circuit to Battery (+).
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Check the wiring connection for damage, corrosion, loose or broken terminals.
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If necessary, repair the faulty wiring connection.
If no malfunction is found in the wiring and ground was not present from the ECM during crank:
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Replace the Motronic Engine Control Module (ECM) (J623).
Final procedures
After the repair work, the following work steps must be performed in the following sequence:
1. Check the DTC memory. Refer to => [ Diagnostic Mode 03 - Read DTC Memory ] See: Powertrain Management/Computers and Control
Systems/Testing and Inspection/Scan Tool Testing and Procedures/Diagnostic Modes 01 - 09.
2. If necessary, erase the DTC memory. Refer to => [ Diagnostic Mode 04 - Erase DTC Memory ] See: Powertrain Management/Computers and
Control Systems/Testing and Inspection/Scan Tool Testing and Procedures/Diagnostic Modes 01 - 09.
3. If the DTC memory was erased, generate readiness code. Refer to => [ Readiness Code ] See: Powertrain Management/Computers and Control
Systems/Testing and Inspection/Monitors, Trips, Drive Cycles and Readiness Codes.