Touareg V8-4.2L (BAR) (2007)
Air Injection Pump Relay: Testing and Inspection
Secondary Air Injection Pump Relay, Checking
Special tools, testers and auxiliary items required
‹› Multimeter.
‹› Wiring diagram.
Test requirements
‹› The Secondary Air Injection (AIR) Pump Relay (-J299-) fuses OK.
‹› The Motronic Engine Control Module (ECM) Power Supply Relay (J271) fuse OK.
‹› Battery voltage at least 12.5 V.
‹› All electrical consumers switched off (radiator fan must NOT run during test).
‹› A/C switched off.
‹› The ignition switched off.
Test procedure
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Perform a preliminary check to verify the customers complaint. Refer to --> [ Preliminary Check ] See: Powertrain Management/Computers and
Control Systems/Testing and Inspection/Scan Tool Testing and Procedures/Preliminary Check.
Start diagnosis
Procedure
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Remove the Secondary Air Injection (AIR) Pump Relay (-J299-).
Checking voltage
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Using a Multimeter, check the Secondary Air Injection (AIR) Pump Relay (-J299-) socket 3/27 to Ground (GND).
Specified value: battery voltage.
If the specified value was not obtained:
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Check the wiring connections from the Battery to the Secondary Air Injection (AIR) Pump Relay (-J299-) socket 3/27 for an open circuit or a
short circuit.
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Check the wiring connections for damage, corrosion, loose or broken terminals.
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If necessary, repair the faulty wiring connection.
If the specified value was obtained:
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Switch the ignition on.
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Using a Multimeter, check the Motronic Engine Control Module (ECM) Power Supply Relay (J271) socket 2/87 to the Secondary Air Injection
(AIR) Pump Relay (-J299-) socket 1/25 for voltage.
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Switch the ignition off.
Specified value: battery voltage.
If the specified value was not obtained:
-
Check the wiring connections from the Motronic Engine Control Module (ECM) Power Supply Relay (J271) socket 2/87 to the Secondary Air
Injection (AIR) Pump Relay (-J299-) socket 1/25 for an open circuit or a short circuit.