2000 jetta secondary air pump problem

Alexo86

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#1
Hi, can someone help me out with my 2000 jetta 1.8t secon day air pump doesn't turn on. I had this P0411 code which I fix by replacing my combi/check valve and clear my code but the thing is the secondary air pump is still not coming on. Work donde so far:
-Test air pump: OK
-Check for leaks on vacuum system: OK
-Test air pump relay and test resistance: OK
So my main question is: How or what activates this air pump to come on?
Note: There's no current check engine light on
Thanks
 

nickb2

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#2
TSB available for code P0411, check attachment ace0.

J299 in ace5 schematic is relay for air pump V101.

Hope any of this helps. You need a pdf reader like abode or similar to read the pdf's. My pdfs come out white on black and may be hard to read sometimes, sorry, have not found out why yet that this is.

When you bypass the the air pump relay, does pump activate? You may have a ECM driver problem in the motronic.

Anyway. follow the best you can the flow chats. I am pretty sure you do not have acces to a VAG scan tool. They are quite rare to have. So pin testing will be a challenge. In a later post, once you have checked out basic wiring to and from relay to air pump, I will provide a ecm pin schematic if needed.

If all checks out, this is smelling like a bad ECU/ECM. But we are not at this stage yet. First commence by the beginning.

Too many ppl here sometimes throw parts at a car and end up spending huge amounts of money because they disregarded advice. 8)

Nick
 

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Alexo86

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#3
These charts are awsome nick thank you very much, now back on subject; when I bypass the air pump relay the secondary air pump starts blowing air thru, in fact this is what I've being doing during all the cold starts to avoid damage to my catalyc sensors or check/combi valve that I recently replaced.

Unfortunately I don't have a VAG scan tool and I'm hopping my ECU/ECM is not the problem. A ECM Pin schematic will help a lot, I wonder what's that T121/66 connector on is coming from... Now, another thing that gets my attention is that on ACE 6 it explains the purpose of the secondary air injection system and how it starts depending on coolant temperature, so is it possible that the coolant temperature sensor is not reading right or defective?.
 

nickb2

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#4
J220 is your motronic engine control module. T121/66 is your pump relay activation signal from ecm. You need to see if your are getting voltage at this terminal when cold start. Also need to check vacuum solenoid valve(N112) signal at terminal T121/9.

Also need to do a resistance check on those two wire for continuity and possible short to ground or open. From ecm to both relay and vacuum solenoid. Also check their grounds. If those wires check ok, and pump is good, and relay is good, and vacuum solenoid is energized when given bat +. Then most likely you have a motronic ecm failure. Also need to make sure all vacuum lines are kosher.

Pay special attention to attachment ace 16. You need 12v coming from T121/9. If not, no go for combi valve function and in the end, no secondary air flow function at all. Do these two tests and post back. If all is well, you are your way to a ecm. Beware, there are two ecm's. The one you want is shown in ace 17. The one on passenger side is your main tcm/ecm and does not apply for secondary air. Just test the wiring from motronic ecm. Since you do not have a vag pin out box, pin testing will have to be done wire by wire based on color code.
 

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nickb2

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#5
Here is another guide I found for you that you can use in conjuction with the schematics I provided. Use what you feel more comfortable with. Of note, I do not think you have a coolant temp sensor malfunction as you would have many of symptoms. However, a ECT is not so easy to check without a scan tool with live data. At the end of attachment 18 you will find a resistance scale. This is pretty much all you can check with a DVM and boiling water and a thermometer.

The alternate secondary air guide is not my writing so it is in red.

P0411 = secondary air system through flow faulty. Refer to diagram for corrective action.

Go through the procedures to check if you missed out any part.

SECONDARY AIR INJECTION (AIR) SYSTEM, SERVICING
Location of Secondary Air Injection (AIR) pump motor -V101-
NOTE: The Secondary Air Injection (AIR) system pump motor is located under the intake manifold.

1. - Intake manifold, upper section

2. - Secondary air injection pump motor

SECONDARY AIR INJECTION SYSTEM, CHECKING
Function, vehicles 06.96 and up

The Secondary air injection system injects air behind the exhaust valve for approx. 30 seconds, depending upon engine coolant temperature, load, RPM and air flow rate during the cold start (+5 C to +40 C engine coolant temperature).

Secondary air injection operation: Produces an Oxygen rich exhaust
Causes after-burning
Reduces the duration of the three-way catalyst heat-up phase

Activation is initiated by the Motronic Engine Control Module (ECM) -J220- via the secondary air injection system pump relay -J299- to the solenoid valve and pneumatic valve.

In addition to the engine cold start warm up phase, the secondary air injection system is checked via On Board Diagnostic (OBD)(up to an 80 C engine coolant temperature, maximum).

If the readiness code is being created, engine coolant temperature can be above 80 C.

SECONDARY AIR INJECTION SYSTEM COMPONENTS, REMOVING AND INSTALLING
NOTE: Complete system is checked using on board diagnostic.

The following list pertains to Fig. 10.

1. Pneumatic valve
Checking, see EXHAUST MANIFOLD, FRONT PIPE AND THREE WAY CATALYTIC CONVERTER (TWC)

2. To brake servo line connector

3. Vacuum hose

4. 2-pin harness connector

5. Secondary Air Injection (AIR) solenoid valve
Checking, see EXHAUST MANIFOLD, FRONT PIPE AND THREE WAY CATALYTIC CONVERTER (TWC)

6. Pressure hose
Ensure it is securely seated

7. Secondary Air Injection (AIR) system pump motor bracket

8. 10 Nm (7 ft lb)

9. A/C hose bracket

10. 10 Nm (7 ft lb)

11. 25 Nm (18 ft lb)

12. Secondary Air Injection (AIR) system pump motor
Checking, see SECONDARY AIR INJECTION PUMP MOTOR, CHECKING

13. Secondary Air Injection (AIR) pump intake hose

14. To Air Cleaner

15. To exhaust manifold union

16. 30 Nm (22 ft lb)

17. Connector tube

18. 10 Nm (7 ft lb)

19. 10 Nm (7 ft lb)

20. Pneumatic valve connector housing

21. 25 Nm (18 ft lb)

22. Gasket
Always replace

23. Union

PNEUMATIC VALVE, CHECKING
Special tools, testers and auxiliary items
US 8026 hand vacuum pump

Test sequence
? Disconnect vacuum hose from secondary air injection solenoid valve.
? Attach US 8026 hand vacuum pump to vacuum hose.
? Disconnect pressure line from pneumatic valve.

NOTE: Do not use compressed air for the following check.

? Connect auxiliary hose to pneumatic valve and blow into it.
Pneumatic valve must be closed.

? Operate hand vacuum pump.

Valve must open and operate smoothly (without sticking).

? Replace valve if necessary.

SECONDARY AIR INJECTION PUMP MOTOR, CHECKING
Special tools, testers and auxiliary items
VAG1598/18 test box
VW1594 connector test kit
VAG1527B voltage tester

Checking requirement
Secondary Air Injection (AIR) pump relay fuse OK

Checking sequence

? Switch ignition OFF.
? Connect VAG1598/18 test box to ECM wiring harness connector.
? Disconnect pressure line from pneumatic valve.
? Switch ignition ON.
? Bridge test box sockets 01 and 06 using jumper wires from VW1594 adaptor kit.
? Connect test box terminals 49 to Ground using jumper wires from VW1594 adaptor kit.

Pump motor must run and air must exit the pressure line.
If pump motor runs, but no air exits hose: ? Check pressure line, and if necessary replace pump motor.

If pump motor does not run: ? Disconnect pump motor harness connector.
? Connect VAG1527B LED tester to disconnected connector using jumper wires from VW1594 adaptor kit.

LED tester must light up.

If tester lights up (voltage supply OK): ? Replace pump motor.

If tester does NOT light up: ? Check wiring between test box socket 49 and pump relay using wiring diagram.
? Check activation of relay and wiring to pump motor using wiring diagram.
? Reconnect 2-pin harness connector.
? Check DTC memory, then erase.

SECONDARY AIR INJECTION SOLENOID VALVE, CHECKING
Special tools, testers and auxiliary items
VW1594 adaptor kit
VAG1527B LED tester
US 8026 hand vacuum pump

Checking requirement
Vacuum hoses OK

? Disconnect vacuum hose to solenoid valve at line to brake servo.?
Connect hand vacuum pump to vacuum hose.
? Disconnect pneumatic valve vacuum hose at valve.
? Switch ignition OFF.
? Connect VAG1598/18 test box to ECM wiring harness connector.
? Switch ignition ON.
? Connect test box terminals 01 and 06 using jumper wires from VW1594 adaptor kit.
? Operate hand vacuum pump.

Vacuum must build up (valve closed).

If vacuum does not build up: ? Replace solenoid valve 2.

If vacuum builds up: ? Connect test box socket 50 to Ground using jumper wires from VW1594 connector test kit

Valve must open.
? Operate hand vacuum pump.

Vacuum must not build up (valve open).
If vacuum builds up: ? Disconnect 2 pin harness connector from solenoid valve.
? Connect VAG1527B LED tester to harness connector using jumper wires from VW1594 adaptor kit.

LED tester must light up.

If tester lights up (voltage supply OK): ? Replace solenoid valve.

If tester does not light up: ? Check wiring for open circuit between test box socket 50 and terminal 2 of 2-pin harness connector using wiring diagram.

Resistance: 1.5 ohms maximum

? Check wiring between central electric and solenoid valve harness connector (terminal 1) using wiring diagram.

? Connect 2-pin harness connector.
? Check DTC memory, then erase.
 

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nickb2

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#6
I know this is all a lot of information. If you can, print the info given and make a plan of attack following instructions. You should invest in a led test light. Very usefull when a scanner is not handy. Try to invest in a cheap elm 327 found on e-bay. Go to the automotive product forum of this site, you will see I post dozens of links to software and other OBD2 friendly sh$t.

Be sure you get the 1.5 version. Well worth the money and you will love it if your into diagnostics. http://www.amazon.ca/s/?ie=UTF8&keywords=elm327+wifi&tag=googcana-20&index=aps&hvadid=34022196342&hvpos=1t1&hvexid=&hvnetw=g&hvrand=8909146107089738657&hvpone=&hvptwo=&hvqmt=e&hvdev=c&ref=pd_sl_8baf9bzxkq_e

Check out my other link as said previously.
 

Alexo86

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#7
Thank you ververy much for all that info I'm still in process to find the problem taking a step a time I'll post back results