Need help with obd-2 codes

**yzfr62k1** · 06-13-2007, 01:32 PM

Greetings - I took my car in for 98 z28 in for a fuel system service and after that my service engine soon light came on. On running OBD diagnostics I get the following messages : Any advice on what this is and why it occured / how to resolve will be appreciated very much. Thanks.

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P0102 Mass or Volume Air Flow Circuit Low Input
P0410 Secondary Air Injection System Malfunction
P0412 Secondary Air Injection System Switching Valve A Circuit Malfunction
P0418 Secondary Air Injection System Relay "A" Circuit Malfunction
P1416 Secondary Air Injection (AIR) System Bank 2
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**OreoLt1** · 06-13-2007, 04:13 PM

Where did you get the service done? How is the car running?

Some places use a TB/intake cleaner sprayed through the air inlet tubes and if this is the case and they did a ghetto/crappy job they may have damaged your MAF. That could possibly explain P0102 Mass or Volume Air Flow Circuit Low Input

P0410 Secondary Air Injection System Malfunction just states that there is a problem whith the Air injection syst.

P0412 Secondary Air Injection System Switching Valve A Circuit Malfunction
P0418 Secondary Air Injection System Relay "A" Circuit Malfunction
P1416 Secondary Air Injection (AIR) System Bank 2
These codes give you a general direction of what circuit to start looking at.

I would check the connector for the MAF, then remove and inspect the MAF and ensure that there is no build up on the sensing wires inside the MAF.

Check fuses, connectors, and relays for the AIR injection system.
Check operation of the Air pump itself. When the vehicle is cold/hasn't been driven for a few hours, start it up and you should hear the air pump run for a few minutes.

**MechanicalMehem** · 06-13-2007, 06:20 PM

the mass airflow sensor code is probably from when they unplugged the mass air flow sensor to do the induction service(starts and runs easier taht way). the AIR stuff could be just about anything, as stated before, check fuses, check to see if it comes on on cold start(it probably will not) guessing w/o looking at your car is like a shot in the dark, but I would guess that the air pump has water in it or has gone bad....
--Justin

**Eagle** · 06-14-2007, 07:01 AM

have you cleared the codes to see if they return? Perhaps they are just stored from when the service was performed?

Otherwise, get under the hood and check all your connections. Past that, start troubleshooting the MAF.

GL

-Eagle

**yzfr62k1** · 06-14-2007, 07:24 AM

Thanks for responding guys. The fuel system service was done at valvoline express care.
The car has minimal performance drop. Other than this the car seems to be running OK.

I do plan on taking it back to valvoline once I get enought information
as im sure they will not take any responsibility.

If it turns out to be MAF / airpump failure , how big of a job is this to resolve ?

**Eagle** · 06-14-2007, 07:32 AM

MAF is essential, and lists @ $145 from autozone, with a $45 core.

If its the airpump, just delete the damn thing.

-Eagle

**yzfr62k1** · 06-14-2007, 10:46 AM

I have tried clearing the codes and they come back on. They also come on as soon as the car starts up even if the car has not be started for several hours.

**Eagle** · 06-14-2007, 11:16 AM

So, I looked over at gearchatter.com (cuz I'm bored today, figured I'd try to figure this out). Found the following schematics:

P0102
P0410/412/418/1416

All of the diagrams have the same "power cell 10" and "ground distribution cell 14" in common... I'm betting thats where you should start looking.

-Eagle

**Eagle** · 06-14-2007, 11:28 AM

Gearchatter.com also says that if P0410, P0412 and P0418 are all set at the same time, the air pump's fuse is open (blown). Have you simply checked your fuses yet at this point?

-Eagle