Secondary Air Injection Pump Motor, Checking

WARNING: This page is about a different variant/trim than selected.

Special tools and workshop equipment 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

-- Perform a preliminary check to verify the customers complaint. Refer to GENERAL DIAGNOSIS .

Start diagnosis

-- Disconnect the secondary air injection hose -arrow-.

Fig 1: Disconnecting Secondary Air Hose

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-- Remove the center noise insulation fasteners -1, 2, 3- and the center noise insulation panel.

Fig 2: Identifying Center Noise Insulation Bolts

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-- Disconnect theSecondary Air Injection (AIR) Pump Motor --V101-- electrical harness connector -3-.

Fig 3: Identifying Secondary Air Injection (AIR) Pump Motor V101 Electrical Harness Connector

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Checking voltage

-- Start engine momentarily.

-- Using a Multimeter, check theSecondary Air Injection (AIR) Pump Motor --V101-- electrical harness connector terminals 1 to 2 for voltage.

Fig 4: Identifying 2-Pin Electrical Connector & Terminals

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-- Switch the ignition off.

Specified value: battery voltage.

If the specified value was not obtained:

-- Using a Multimeter, check the Secondary Air Injection (AIR) Pump Motor --V101-- electrical harness connector terminal 2 to Ground (GND).

Fig 5: Identifying 2-Pin Electrical Connector & Terminals

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Specified value: battery voltage.

If the specified value was not obtained:

-- Check the wiring connection from the Secondary Air Injection (AIR) Pump Relay --J299-- socket 5/26 to the Secondary Air Injection (AIR) Pump Motor --V101-- electrical harness connector terminal 2 for an open circuit or a short circuit.

-- Check the wiring connections for damage, corrosion, lose or broken terminals.

-- If necessary, repair the faulty wiring connection.

If the specified value was obtained:

Checking Ground (GND)

-- Using a Multimeter, check the Secondary Air Injection (AIR) Pump Motor --V101-- electrical harness connector terminal 1 to Ground (GND) for resistance.

Fig 6: Identifying 2-Pin Electrical Connector & Terminals

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Specified value: 1.5 Ω Max.

If the specification was not obtained:

-- Check the wiring for a short circuit to each other, Battery (+), and Ground (GND).

-- Check the electrical harness connector for damage, corrosion, lose or broken terminals.

-- If necessary, repair the faulty wiring connection.

If no malfunction is found in the wiring and voltage supply was OK:

-- Replace Secondary Air Injection (AIR) Pump Motor --V101--.

-- Install the center noise insulation fasteners -1, 2, 3- and the center noise insulation panel.

Fig 7: Identifying Center Noise Insulation Bolts

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-- Connect the secondary air injection hose -arrow-.

Fig 8: Disconnecting Secondary Air Hose

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Final procedures

After repair work, the following work steps must be performed in the following sequence:

Check the DTC memory. Refer to DIAGNOSTIC MODE 03 - READ DTC MEMORY .
If necessary, erase the DTC memory. Refer to DIAGNOSTIC MODE 04 - ERASE DTC MEMORY .
If the DTC memory was erased, generate readiness code. Refer to READINESS CODE .

-- End of diagnosis.