Secondary Air Injection Pump Relay, Checking
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
-- Remove the Secondary Air Injection (AIR) Pump Relay --J299--.
Checking voltage
-- 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:
-- 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.
-- Check the wiring connections for damage, corrosion, lose or broken terminals.
-- If necessary, repair the faulty wiring connection.
If the specified value was obtained:
-- Switch the ignition on.
-- 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.
Specified value: battery voltage.
-- Switch the ignition off.
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.
-- 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 activation
-- Install the Secondary Air Injection (AIR) Pump Relay --J299--.
-- Switch the ignition on.
-- Using a Multimeter, check the Secondary Air Injection (AIR) Pump Relay --J299-- socket 2/24 to Ground (GND)
-- Switch the ignition off.
Specified value: battery voltage.
If the specified value was not obtained:
-- Check or replace the Secondary Air Injection (AIR) Pump Relay --J299--.
-- 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 wiring
If the manufacturers test box is being used. Perform the following step.
-- Install the test box. Refer to Repair information(test box) at Engine Control Module.
If the manufacturers test box is not being used. Perform the following step.
-- Remove the Motronic Engine Control Module (ECM) -J220-. Refer to MOTRONIC ENGINE CONTROL MODULE, REPLACING .
-- Using a Multimeter, check the Secondary Air Injection (AIR) Pump Relay --J299-- socket 2/24 to the Motronic Engine Control Module (ECM) -J220- electrical harness connector T121 terminal 46 for resistance.
| Secondary Air Injection (AIR) Pump Relay --J299-- socket terminal | Motronic Engine Control Module (ECM) -J220- electrical connector T94 terminal or test box socket |
|---|---|
| 2/24 | 46 |
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 the Secondary Air Injection (AIR) Pump Relay --J299--. Refer to Repair information.
If no malfunction is found in the wiring and voltage supply was not OK:
-- Replace the Motronic Engine Control Module (ECM) -J220-. Refer to MOTRONIC ENGINE CONTROL MODULE, REPLACING .
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.