P0410,P0411
Symptom: CHECK ENGINE lamp (MIL) on.
Secondary air injection system, incorrect flow
Fault symptoms
CHECK ENGINE lamp (MIL) on.
Conditions
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Diagnosis not yet performed this
trip.
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Engine coolant temperature < 55°C (132°F).
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and
P0410 (large flow) Closed loop >25%% for 20 seconds.
P0411 (small flow) Secondary air injection pump and closed loop increase <12
percentage points within 12 seconds.
Diagnostic help
A diagnosis of the secondary air injection system can be obtained with the ISAT scan
tool.
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Select "SLS DIAGNOSIS".
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On completion of diagnosis the ISAT scan tool will show "READY", otherwise
"NOT READY".
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The secondary air injection system can be activated with the ISAT scan tool.
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Select "SECOND. AIR RELAY".
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The pump will be activated at a frequency of 0.5 Hz for 30
seconds.
Check the wiring
Intermittent faults may occur as a result of temporary short circuits and breaks in the
wiring. Jiggle the wiring at several points and in different directions to ascertain whether the
wiring harness, including any connectors, is causing the trouble. Observe the multimeter,
ISAT scan tool or test lamp while doing this.
Diagnostic procedure
1. Check other Motronic 4.1 diagnostic trouble codes
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Connect the ISAT Scan
Tool.
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Turn the ignition switch to the ON position.
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Select "READ FAULT CODES".
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Does the ISAT scan tool show diagnostic trouble code P1680?
Continue fault diagnosis with P1680.
Continue with point 2.
2. Check the fuses
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Check that fuse 12 and MAXI-fuse
3 are intact. The fuses are on the fuse board, main fuse box in the engine
bay.
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Are the fuses intact?
Continue with point 3.
Change the blown fuse. Continue with point
3.
3. Check the performance of the secondary air injection
pump
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Turn the ignition switch to the ON
position.
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Select "SECOND. AIR RELAY".
See Diagnostic help.
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The command activates the two relays of the secondary air injection system at a
frequency of 0.5 Hz for 30 seconds.
Is the secondary air injection pump working?
Continue with point 9.
The secondary air injection pump is not working and MAXI-fuse 3 has blown.
Continue with point 8.
The secondary air injection pump is not working but MAXI-fuse 3 is still intact.
Continue with point 4.
4. Check the switching function of the secondary air injection pump
relay.
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Remove the secondary air injection
pump relay.
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Forcibly run the secondary air
injection pump by connecting a jumper lead in the relay base between:
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The secondary air injection pump should run
continuously.
Is the secondary air injection pump working?
Continue with point 5.
Continue with point 8.
5. Check the relay, secondary air injection pump control
current
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Connect the test lamp
to:
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Turn the ignition switch to the ON
position.
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Select "SECOND. AIR
RELAY".
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The test lamp should flash at a frequency of 0.5 Hz for 30
seconds.
Test lamp flashing?
Continue with point 6.
Continue with point 7.
6. Check the operation of the relay, secondary air injection
pump
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Connect the test lamp to the relay
socket between:
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Turn the ignition switch to the ON
position.
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Select "SECOND. AIR
RELAY".
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The test lamp should flash at a frequency of 0.5 Hz for 30
seconds.
Test lamp flashing?
Change the secondary air injection pump relay. Continue with point
11.
Check and if necessary repair or replace the lead between pin 85 of the relay
socket and grounding point G30. Continue with point
11.
7. Check the switching function of the relay, secondary air
injection control valve
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Refit the secondary air injection
pump relay.
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Remove the secondary air injection control valve relay.
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Connect the test lamp to:
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The test lamp should light up.
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Connect a jumper lead to the relay
socket between:
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The secondary air injection pump should run
continuously.
Is the secondary air injection pump working?
Change the secondary air injection control valve relay. Continue with point
11.
Check and if necessary repair or replace the lead between: • pin 30 of the
relay socket and fuse 12. • pin 87 of the relay socket and pin 86 of the secondary air
injection pump relay. Continue with point 11.
8. Check the secondary air injection pump
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Connect the test lamp
to:
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The test lamp should light up.
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Unplug the secondary air injection
pump's 2-pin connector.
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Connect the test lamp to the female connector between:
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Connect a jumper lead to the relay socket between:
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The test lamp should light up.
Did the test lamp light up?
Change the secondary air injection pump. Continue with point
11.
Check and if necessary repair or replace the lead between:
• pin 30 of the relay socket and MAXI-fuse 3.
• pin 87 of the relay socket and pin 2 of the secondary air injection pump's
connector
• pin 1 of the secondary air injection pump's connector and grounding point
G30.
Continue with point 11.
9. Check the hose system
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Disconnect the hose from the
exhaust manifold's non-return valve.
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Disconnect the hose from the
secondary air injection control valve and connect it to a vacuum pump. The hose is on the
side facing towards the front of the car (towards the vacuum valve).
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Turn the ignition switch to the ON position.
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Select "SECOND. AIR RELAY".
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The secondary air injection pump should work but it should not blow air into the
thick hose.
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Use the vacuum pump to build up a
vacuum. The pump should now blow air into the hose.
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Result OK?
Continue with point 10.
Change the vacuum valve. Continue with point
11.
10. Check the secondary air injection control
valve
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Disconnect the vacuum hose from
the secondary air injection control valve's inlet pipe.
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Connect a vacuum pump to the
control valve.
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Use the vacuum pump to build up a
vacuum.
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Check that the control valve does
not leak.
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Turn the ignition switch to the ON
position.
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Select "SECOND. AIR
RELAY".
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The vacuum should disappear.
Result OK?
Continue with point 11.
Change the secondary air injection control valve. Continue with point
11.
11. Final check
Use the ISAT scan tool to activate diagnosis of the secondary air injection
system. For diagnosis to be carried out, the following conditions must be
fulfilled:
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The secondary air injection system
must have been activated at the start of this trip.
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Diagnosis not yet performed this trip.
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Perform diagnosis:
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Connect the ISAT Scan
Tool.
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Select "SLS
DIAGNOSIS".
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Wait for about 2 minutes or until the ISAT scan tool reads
"READY".
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Obtain a readout of the diagnostic trouble code.
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Has the diagnostic trouble code recurred?
Continue as described in
.
The steps taken to rectify the fault were
correct.
