inertia switch

**t2erns** · October 17th, 2014 12:28 AM

does anybody know where i can buy an inertia switch (like the one on fords) generic types if available.

**mrjeff** · October 17th, 2014 03:42 PM

Dito sir may mabibili na fuel inertia malayo lang sa pinas

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**t2erns** · October 18th, 2014 07:14 AM

Originally Posted by mrjeff

Dito sir may mabibili na fuel inertia malayo lang sa pinas

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he he, just trying my luck to find it here. hanapin ko na lang mga nag convert diesel sa kanilang expeditions.

**jick.cejoco** · October 18th, 2014 02:07 PM

if your objective is to trip or turn the circuit off upon impact, you can substitute the inertia switch with the front crash sensor for the airbag system

**t2erns** · October 20th, 2014 11:26 AM

thanks jick, that will be equally hard to find here. i had a gm with failed fuel pump relay driver (from pcm) i explained to the customer that if i will ground the relay and i will need a shut-off switch if i'm going to hack it. customer doesn't approve the idea and doesn't want to buy a new pcm so i sent him away.

**jick.cejoco** · October 20th, 2014 01:54 PM

Originally Posted by t2erns

thanks jick, that will be equally hard to find here. i had a gm with failed fuel pump relay driver (from pcm) i explained to the customer that if i will ground the relay and i will need a shut-off switch if i'm going to hack it. customer doesn't approve the idea and doesn't want to buy a new pcm so i sent him away.

the pcm driver for the fuel pump relay is only used to pre-pressurize the fuel rail for 3 seconds. when the engine starts, the oil pressure switch takes over to keep the fuel pump running. i.e., if the vehicle is a genuine g.m. product and not a korean daewoo labeled and sold as a g.m.

**t2erns** · October 22nd, 2014 09:05 AM

it's an 05 trailblazer, i guess it doesn't have back-up circuit from oil pressure switch (like older gms) as per wiring diag.

**jick.cejoco** · October 22nd, 2014 09:43 AM

The oil pressure switch has three terminals. One is +B, one is a grounding switch for the oil pressure warning light and one feed to the fuel pump circuit. You can use a PNP power transistor with the base connected to the warning light circuit to power the fuel pump

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**t2erns** · October 22nd, 2014 01:04 PM

[QUOTE=jick.cejoco;2416423]The oil pressure switch has three terminals. One is +B, one is a grounding switch for the oil pressure warning light and one feed to the fuel pump circuit. You can use a PNP power transistor with the base connected to the warning light circuit to power the fuel pump

thanks sir jick, i checked the wiring again for the oil pressure swicth, looks very much different from older gm. the switch for 4.2 liter (subj vehicle) has only 2 terminals just like an ordinary switch, while the 5.3 has 3-pin trasducer (5v ref, ground, and signal). anyway thanks for the idea i can use the switch as a safety cut-off for the pump (on older gms)

CORRECTION: the pcm is supplying b+ to the pump relay not ground