F0:DATA LIST
| No. | Tech 1 Display | Conditions for checking | Nominal value | Trouble Codes | Terminal |
|---|---|---|---|---|---|
| 17 | SEC. AIR PUMP REL. | X 22 XE engines only: | |||
| Engine running at idle speed, cold | ACTIVE 0V | 46, 47 | 6 | ||
| Engine running at idle speed, operating temperature (coolant temperature above 60 5C (140 5F) | INACTIVE 12V | ||||
| Alternative check, if engine is already warm: |
Engine warm
| Disconnect coolant temperature sensor P12 | ACTIVE 0V |
Note:
When coolant temperature sensor is disconnected a trouble code is set when the engine is switched off. The trouble code must be deleted the next time the engine is started and the coolant temperature sensor is connected.
| 20 SE, X 20 SE and 22 XE engines only: | NOT USED |
Important:
If the secondary air pump is not actuated the thermo protective switch in the pump might have interrupted the circuit. Let the engine cool down and repeat the test.
Note:
First check secondary air injection relay K12 with F5:actuator test, no. 09. If the results of this test are negative, proceed with trouble - shooting as described below.
| Troubleshooting | Nominal value | Cause of Fault |
· Disconnect secondary air injection relay K12 from relay base.
· Ignition "ON".
· Using multimeter, measure voltage at relay base K12 to ground
| - to Ter. 4 | greater than 11.5 V | · Interruption or short circuit to ground in lead connection from Motronic control unit K61 / Ter. 37 or from fuel injection unit relay K68 / Ter. 8 (Ter. 87) to secondary air injection relay K12 / Ter. 4 |
|---|---|---|
| - to Ter. 8 | greater than 11.5 V | · Fuse FL2 defective |
· Interruption in lead from relay K12 / Ter. 8 to
| Fuse FL2 |
· Ignition "OFF".
· Disconnect wiring harness plug from Motronic control unit K61.
· Ignition "ON".
· Using multimeter, check connection between wiring harness plug K61 / Ter. 6 and relay base K12 / Ter. 6
- for passage
- for short circuit to ground
| - for short circuit to + battery voltage | passage |
¥ W
0 V
| · Interruption, short circuit to ground or to positive terminal in lead connection from Motronic control unit K61 / Ter. 6 to secondary air injection relay K12 / Ter. 6 |
· Ignition "OFF".
| · Using multimeter, measure voltage and resistance between relay base K12 / Ter. 2 (Ter. 30) and ground | 0 V, |
|---|---|
| approx. 7 W | · Interruption or short circuit to ground or positive terminal in lead connection from relay base K12 / Ter. 2 (Ter. 30) to |
- secondary air injection solenoid valve Y6
- secondary air pump motor M27
· Interruption in lead connection from
- secondary air injection solenoid valve Y6
- secondary air pump motor M27
| to ground | |
|---|---|
| Further possible faults: | · Secondary air injection relay K12 defective |
· Secondary air injection solenoid valve Y6 defective
| · Secondary air pump motor M27 defective |