Hey everyone,

I know this topic and these codes have been brought up a lot. Struggling to diagnose P1414 and P1417 Secondary Air Injection faults on my Discovery 2. The codes are P1414 SAI system fault (LH side) ‐ air delivery not reaching catalysts and P1417 SAI system fault (RH side) ‐ air delivery not reaching catalysts.

Considering I have both codes for both banks, that “in theory” eliminates an issue with individual valves on each bank. The SAI pump isn’t turning on at start up when the engine is below 60° C but if you jump the SAI Pump relay, the pump turns on and sounds healthy. ECM ground control side of pump relay stays at 6V - should this be dropping to 0V to actuate the relay? Power control side has constant 12V. Tested SAI Pump relay as good: when 12V is sent through control side, load side has continuity (0.1 ohms) and relay clicks. Visually checked all vacuum lines and don’t see any obvious disconnected or torn lines. The SAI vacuum control solenoid has 12V on one side and 6V on the other. Removed one line on the solenoid and felt vacuum at the line. With that line plugged in, felt no vacuum on the nipple on the solenoid indicating maybe the solenoid is stuck closed? The solenoid has continuity at roughly 28 ohms.

I know the pump works when the relay is jumped. I’m not 100% sure if the control solenoid is working but the pump should still turn on even with a bad solenoid? I checked the ECT through the OBD2 and at start up, the temperature was well below 60° C but no pump operation. I’m leaning toward potentially a bad ECM or bad ground on the ECM to actuate the pump but I may be misunderstanding how the system works. It seems like the ECM isn’t triggering the pump on when it should be on.

Would the pump still turn on with a bad vacuum control solenoid? What should the next step be? I don’t want to shotgun parts.

Thank you.

 

Open the hood and stand outside your truck before you start it in the Am. Have someone else start the engine on a cold morning you can hear the pump it is fairly loud, you can also put you hand on it and feel tif it goes.

 

Repeating what I said in the original post, the SAI pump does not turn on unless the SAI pump relay is jumped. With the relay jumped, the pump sounds fine and runs as intended. The relay tests good and have swapped relays just for the hell of it - no dice. Have attempted dozens of times over the last few months with the hood open and the pump never turns on unless the relay is jumped. Whenever the pump isn’t running, it because it is not receiving 12V at the connector. The pump always runs when the relay is jumped. It has all the signs of a bad relay but the relay has been swapped and tests as good.

 

You didn't say that you tested anything with the connector(s) disconnected. Don't assume that wiring and connectors are good. You say you see 6v, make sure you confirm that a soft short isn't your prob.

 

Thanks for the response. With the SAI pump relay disconnected, I have 6V present on the control ground side (low current) and 12V present on the control power side (low current). I have 12V present on the pump power side (high current) and 0V present on the pump ground side (high current). With the vacuum solenoid disconnected, I also have 12V present on the power side and 6V present on the ground side. Is it 6V for both the pump and solenoid because it’s ground side controlled by the ECM? Every load has 12V present at the connector besides the pump. The pump has 12V if you jump the relay. I would assume I need to have 0V present on the ground side of both the relay and solenoid for them to energize the coil hence why I have a hunch that the issue may be in the ECM or the ECM ground. Am I thinking about this wrong?

 

I assume you are measuring in the relay sockets? You're pulling the SAI and fuel pump relays and measuring there? If so, measure there with the ECU connector disconnected. If you don't see 6v this time, measure resistance to gnd on both and compare. They should be infinite/open. If your SAI differs from your fuel pump then you have probably found a bad wire. If they are the same, then you probably have a bad ECU or something.

 

Thanks for the response. Yes, I am testing for voltage and ground present in the relay socket. Hadn’t thought about comparing the SAI pump relay to the fuel pump relay. I’ll give that a try. Would someone else potentially be able to do the same test I am trying and see if they have 6V present in the SAI pump relay socket with the key on/engine off and with the key on/engine on cold start when the pump should be running? For me, 2 pins have 12V, 1 pin has 6V and 1 pin has 0V. I can check again the exact pin numbers have what voltages. I would be interested to see if when the pump is running on cold start, if the relay is pulled, one would see 0V rather than 6V. Thanks.