Jetta Sedan L5-2.5L (BGP) (2005)
Air Injection Pump Relay: Testing and Inspection
Secondary Air Injection Pump Relay, Checking
Special tools, testers and auxiliary items required
‹› Multimeter.
‹› wiring diagrams.
Test requirements
‹› Fuse (SB10) OK.
‹› Fuse (SB51) OK.
‹› The Ground (GND) connections at the engine and transmission OK.
‹› The battery voltage at least 12.5 V.
‹› The generator OK.
Test procedure
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Perform a preliminary check to verify the customers complaint. Refer to --> [ Engine Control Module, Replacing ] See: Computers and Control
Systems/Engine Control Module/Service and Repair/Removal and Replacement/Engine Control Module, Replacing.
Start diagnosis
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Using a Multimeter, check the following wiring connection for voltage.
Specified value: 12.5 V
If the specified value was not obtained:
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Check the Secondary Air Injection (AIR) Pump Relay (-J299-) socket T31/27 to the Battery (A) for an open circuit or short to Ground (GND).
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Check the electrical harness connectors for damage, corrosion, loose or broken terminals.
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If necessary, repair the wiring connection.
If no malfunctions are found in the wiring:
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Crank the engine.
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Using a Multimeter, check the following wiring connection for voltage.
Specified value: 12.5 V
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Switch the ignition off.
If the specified value was not obtained:
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Check the Secondary Air Injection (AIR) Pump Relay (-J299-) socket T31/25 to the Motronic Engine Control Module (ECM) Power Supply
Relay (J271) socket 2/87 for an open circuit or short to Ground (GND).
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Check the electrical harness connectors for damage, corrosion, loose or broken terminals.