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Chevrolet Blazer Warning Lights and Gauges
christopher71
Member Posts: 8
in Chevrolet
The problem started last march with the engine light. I used a small shop for repairs. they couldn't fix it. they would reset it and it wouldn't come back for months. This month it came back so i took it to dealer. they fixed it. now it is back on again! the light seems to come on once a month.
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tidester, host
Problem appears to be in the computer. The real question here is that when I try to get my vehicle emmission tested for licensing, the computer shows that it is "NOT READY" and gives the same error message. Is there anything that can be done besides replacing the entire computer to solve this problem?
The part is on national back order. That tells me the part is in demand. So alot of blazers have this problem. Why is it not a recalled item? By the way since march I have spent $2000 in repairs.
Fixed my 01 and a total rebuild on the 99. Some parts can be obtained from a local auto store using the Delco # found on the pump and the check valves eveyone has. Got the pumpine for $100. See the description below because there are a few check valves, hoses, and solenoids also that often fail.
DTC P0410 (SES Light On) - Secondary Air Injection
P1415 and/or P1416 for secondary air injection Bank A and B can also be set if the powertrain control module (PCM) detects a heated oxygen sensor voltage mismatch and activates an internal test to confirm.
Circuit Description:
This is located under the radiator (pump, electric solenoid, and vacuum shutoff valve) and tees off up to the exhaust manifolds thru 2 check valves on 4.3L. For 4wd remove the front skid plate to access. The secondary air injection pump is used to lower tail pipe emissions on start-up. The PCM supplies a ground to the pump relay, which energizes the pump and the electric solenoid valve. Engine vacuum is applied to the shut-off valve when the solenoid is energized. The engine vacuum opens the shut-off valve that allows air to flow to the exhaust manifolds. Often the pump gets water/moisture in it and freezes up blowing the fuse and the check valves rust or freeze open internally and then burn thru the rubber hose, and even melt the lower “T”, shutoff, and even pump impeller.
TSB # 01-07-30-023A
Harsh 1-2 Upshift, SES, MIL, or CEL Illuminated, DTC P1870 Set (Replace Valve Body)
When the conditions for setting DTC P1870 are met (first trip), the PCM commands maximum line pressure and harsh 1-2 shifts are the result. This may result in a harsh 1-2 shift with no history code if the conditions for setting the DTC required for the second trip are not met, on two consecutive trips (Ignition cycles, with a drive cycle).
Bottom line driving it may or may not damage it more - I had this occur on my 99 and after shutting it off and restarting it went away and that never returned. At least stop by and have the pan dropped and the filter changed ($60-85) and see if all works OK. This normally only requires a TCC solenoid replacement if any repair - but depends on mileage and use/abuse (towing/offroading etc).
t shift gears. It has no power. I hit the gas all the way and all it gives me is like 20 mph. That Service light has come on again for ny vehicle. they first time we had the Alternator replace and it helped. Second time me and my dad replaced the Alternator and it worked again. But this is getting very costly. what should I do? Should I get rid of this car or should I attempt to fix it?
$150 for an alternator is pretty cheap as things go on vehicles. Also is it 4wd and what mileage and what else have you done recently.
Thanks
I need some direction to look for a cause.
Thank you for any and all help.
1. As for the air pump - yes those often fail and their is a pump under the radiator that pumps air into exhuast for 1 min or so on startup and the hose stucks water, the 2 metal check valves fail open and burn the hoses off too, and then their are 2 solenoids and 2 pplastic diaphrams that can get burned.
2. Fuel pump pressure has to be tested and its 60psi min at start (key on engine off) and 53psi min running. Need a pressure tester on the test rail about $35 from Actron. In the tank and a pain to drop if not setup to do it. Use only a Delco pump as most aftermarkets have had problems and only have a 1 year warranty. Part is $400-500.
3. Yes, possible that low or fluating fuel pressure cabn cause other codes but need the codes - a P0300 random misfire is one but that has about 6 other possible reasons too.
4. Serpentine belt is the big "fan" belt that is $25-30 part and then thereare 2 pulleys tha may squeal called the idler (fixed on top) and the flex one called tensioner.
I would recommend a stock DELCO unit, but you can get aftermarket units for fairly cheap.
Another place you can buy a fuel sending unit is from a guy in florida, who runs a very reputable EBay store. I've bought many S10/Blazer parts from him, and never had any problems. He is a really good guy.
Heres a link to his store - S10 Warehouse
Keep in mind, that when you install the new unit, to be very careful with the arm when your putting it back in. THEY ARE VERY SENSITIVE...
-- Cheers, "KuT"
Could having the radio unplugged for so long, reset the Anti-theft/passlock code? Im lost, and dont know where else to turn..
The Passlock Anti-Theft system involves resistor codes which are generated by resistors located in the ignition key cylinder switch. The GM Passlock system uses what is known as a Hall Effect Sensor to send a resistor code to the Passlock module. The resistor code is activated when the ignition key is physically rotated in the ignition switch. Depending on the model of GM vehicle, the actual resistor code is only introduced to the Passlock system when the ignition switch is turned to the ignition on (run) position or only when the ignition switch is turned to the start (crank) position.
This is also what I learned (Don't know if it will help others)
When I unplugged the wiring harness from the Multi-Switch/Ignition, I forgot to unhook the battery before doing so. (I swear I took the cables off). With the battery still giving juice, and my taking the harness off, the system took it as "Teft Tampering of the wires", and put the system into Anti-Theft mode. Also, being that I had stuff unplugged so long, there was a communication error, and the system body module had lost some kind of information.
The dealer diagnosed it, popped 3 codes, and reset everything, and had to "re-teach" the module.
All being said, the truck runs (yay), and I now have C/C. What I thought would be an easy task, and a fairly cheap one, turned out being nearly $300 after everything was done.
Meh.. Im just an uneducated 23 year old, learning from his mistakes.
Lifes a B.
thanks again
Anyone have an idea what to check for?
DTC P0410 Sec Air Injection - How to Repair and Part#s
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99-01 Blazers with the 4.3L motor and 00-03 2.2L motors have the Secondary Air Injection system and I've listed the codes, part #s, circuit description, and have to fix below.
DTC P0410 (SES Light On) - Secondary Air Injection
P1415 and/or P1416 for secondary air injection Bank A and B can also be set if the powertrain control module (PCM) detects a heated oxygen sensor voltage mismatch and activates an internal test to confirm.
Circuit Description:
This is located under the radiator (pump, electric solenoid, and vacuum shutoff valve) and tees off up to the exhaust manifolds thru 2 check valves on 4.3L. For 4wd remove the front skid plate to access. The secondary air injection pump is used to lower tail pipe emissions on start-up. The PCM supplies a ground to the pump relay, which energizes the pump and the electric solenoid valve. Engine vacuum is applied to the shut-off valve when the solenoid is energized. The engine vacuum opens the shut-off valve that allows air to flow to the exhaust manifolds. Often the pump gets water/moisture in it and freezes up blowing the fuse and the check valves rust or freeze open internally and then burn thru the rubber hose, and even melt the lower “T”, shutoff, and even pump impeller.
Check/Replace as required:
1. You should hear the pump on starting the Blazer and if you put your hand on it you will feel it running for about 1 minute. Part #12560095 (AC Delco 215-364) Pump, Sec Air Inj for 1999-2000 L35 (4.3L) or #12568324 (AC Delco 215-425) Pump, Sec Air Inj for 2001 L35 (4.3L) + 2000-2003 L43/LN2 (2.2L).
The GM # is on your current pump so check it because the Dealer is very confused and/or out of these and will sub other pumps. You can remove the pump and take the #25 torx screws out and see if the impeller is clogged, rusted, melted, etc before spending $100-200 for it. Impeller should spin freely.
2. Extend the air intake hose that ends halfway up the passenger side of the radiator about 2 more feet so it can run between the battery and coolant reservoir and push into the fender hole to keep dry. 99-00 is 5/8 heater hose and inline connector and 01-03 is 3/4 heater hose and inline connector –check size.
3. #12558992 (AC Delco 215-638) air injection check valves 2 required – most stores sell these for $12-20 each or Dealer $33 each. If they rattle or the hoses are burned thru replace – should only flow air into the exhaust. The easiest way is to remove the two 13mm nuts that mount the check valve pipe to the exhaust manifold and use a vise to hold them – trust me here. The little exhaust gaskets should be reusable.
4. #10217106 connect (hoses) 2 required check valves to pipes (Dealer Only $7 each). If burned thru or hard/brittle replace. Usually a good thing to plan on buying!
5. #12555165 secondary injection shutoff valve (vacuum operated in the ¾” hose in the pump outlet to the “T” pipe under the Blazer (Dealer Only $27). Only open when the pump is on and vac applied. Also replace the 5/32” vac hose from the solenoid to valve and solenoid to intake (about 4 ft of it). Once you extend the air intake listen to the hose end and you should not hear any exhaust noise after the short initial one minute pump run – if you still do the vac diaphragm is stuck open/clogged/burned so replace. Vac is applied by an electric solenoid mounted by the pump #01997264. The center vac port goes to the intake manifold vac and the off center vac goes to the shutoff valve above. The vac should only be applied to the shutoff valve for that 1 minute as the Blazer starts then is switched off. Hose clamps will be needed here.
6. #10105352 “T” for under Blazer where pump outlet to both pipes connect – if yours melted! One end is ¾” and two are 5/8”ends - but you can use a ¾” on all ends with a little lube. Hose clamps here too.
7. The pumps 30 amps Maxi-fuse (large size) is under a little black cover between your battery tray and inside the passenger side fender. You may have to remove your battery to get to it. Depress the little cover retainer and remove, then pull the large fuse out to check/replace. There’s also a 10 amp small fuse to check for the electric solenoid that controls the secondary injection shutoff valve mounted by the air pump.
8. If you need the 2 lower hoses that connect the metal pipes to the “T” going to the pump here’s the bad news – Dealer Only and includes the pipes so over $100.
That’s all there is to it – Enjoy.
tidester, host