B2960, b2961
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Joined: Nov 2007
Posts: 2,185
From: Zurich
Yes it can. What would be an easy way to check is measure voltage drop along the main lines when starting. If you have important voltage drops say on a grounding strap to the engine block the starter may pull 2 or 3 volts bringing the circuit voltage down to 9 volts or so. This is just about the limit for an ECU or any electronics box. Now if you have a corroded ground strap, it may pull an additional 2 volts out of the circuit and you may end up at a point where it may just barely crank but the ECU cannot open the injectors, or the fuel pump stops. Not to mention all that happens inside the ECU.
I'd start by checking the battery health (acid telltale/sight hole on battery) voltage before and after a full charge with external charger. Then all that main thick wiring to and from battery to starter motor for corrosion, loose contacts and measure resistance and voltage drop when starting.
I'd start by checking the battery health (acid telltale/sight hole on battery) voltage before and after a full charge with external charger. Then all that main thick wiring to and from battery to starter motor for corrosion, loose contacts and measure resistance and voltage drop when starting.
Did you find your issue with no start?
*Using Google Translate*
Hey. I know that the topic has been published many times, but my situation is slightly different. Chevrolet Blazer 1998 4.3 V6 LT. The engine does not start. Errors B2960 and B2961. I have replaced "US515 STANDARD ENGINE PRODUCTS {Click Information Button for Alternative / OEM Part Numbers} (Standard Replacement) Information without Drive Right" purchased from Rockauto. Nothing has changed. The car still does not start. Where to look for a problem What else can I do before I set fire to it? Maybe I bought the wrong part? Key programming didn't help. The subtitle service is constantly lit. When closing the car with the remote control, the first press closes the locks, the second should activate the siren signal, but it does not start. I read somewhere that you can bypass the SERVICE by installing remote start. It is possible? I went to my Chevy to refuel. The tow truck took us from the station. I have been fighting since November 2019 and I have no more strength or ideas to fix it. Help me please.
Hey. I know that the topic has been published many times, but my situation is slightly different. Chevrolet Blazer 1998 4.3 V6 LT. The engine does not start. Errors B2960 and B2961. I have replaced "US515 STANDARD ENGINE PRODUCTS {Click Information Button for Alternative / OEM Part Numbers} (Standard Replacement) Information without Drive Right" purchased from Rockauto. Nothing has changed. The car still does not start. Where to look for a problem What else can I do before I set fire to it? Maybe I bought the wrong part? Key programming didn't help. The subtitle service is constantly lit. When closing the car with the remote control, the first press closes the locks, the second should activate the siren signal, but it does not start. I read somewhere that you can bypass the SERVICE by installing remote start. It is possible? I went to my Chevy to refuel. The tow truck took us from the station. I have been fighting since November 2019 and I have no more strength or ideas to fix it. Help me please.
BF Veteran
Joined: Jan 2007
Posts: 4,636
From: Florida
Given the missing BCM fuse and dead battery, Make sure all fuses are present and the right values. Charge the battery, make sure it gets to 12.6 volts and holds. Clear the codes. Try to start the truck, if it still won’t start, measure the battery voltage during cranking. Perform the passlock relearn process. If it still won’t start, read codes again.What scanner are you using that gives you these GM specific trouble codes. Most people here don’t have a high end scanner like that?
your codes are for the ambient light sensor (don’t worry about that for now), passlock security issues, and an incorrect voltage from the ignition switch when you insert the key (may have to chase that one down after the relearn).
Given that your security light is now functioning properly, you have spark and proper fuel pressure the next step would be to verify the lack of fuel injector pulse during crank no start.
George
your codes are for the ambient light sensor (don’t worry about that for now), passlock security issues, and an incorrect voltage from the ignition switch when you insert the key (may have to chase that one down after the relearn).
Given that your security light is now functioning properly, you have spark and proper fuel pressure the next step would be to verify the lack of fuel injector pulse during crank no start.
George
Last edited by GeorgeLG; Oct 10, 2021 at 09:29 AM.
--Well now it won't even crank over. Fully charged battery. Still won't. Tested the starter an no power is going to it atm. Said the main wire and reference wire to starter he checked an both had nothing for power.. now maybe where should I start checking? The battery an cables? Or... and by the way I appreciate all you guys help with my questions an problems. ♡♡ its been about 8 months now of blazer not starting so obviously I need get it figured out asap. Or longer it sits more issues may arise is what I believe lol. An its My ONLY means of transportation so that's another bummer.
Yes it can. What would be an easy way to check is measure voltage drop along the main lines when starting. If you have important voltage drops say on a grounding strap to the engine block the starter may pull 2 or 3 volts bringing the circuit voltage down to 9 volts or so. This is just about the limit for an ECU or any electronics box. Now if you have a corroded ground strap, it may pull an additional 2 volts out of the circuit and you may end up at a point where it may just barely crank but the ECU cannot open the injectors, or the fuel pump stops. Not to mention all that happens inside the ECU.
I'd start by checking the battery health (acid telltale/sight hole on battery) voltage before and after a full charge with external charger. Then all that main thick wiring to and from battery to starter motor for corrosion, loose contacts and measure resistance and voltage drop when starting.
I'd start by checking the battery health (acid telltale/sight hole on battery) voltage before and after a full charge with external charger. Then all that main thick wiring to and from battery to starter motor for corrosion, loose contacts and measure resistance and voltage drop when starting.
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