basic engine testing.pdf

[Happy Trails]

Hi,

I have been attempting to get started my nephew's 1993 850 glt
non-turbo. It has fuel pressure at the bleed point but no spark.

Fuel pump operates okay - I can hear it pump up again after I bleed
the rail.

It is at a location far from my house, so I can only go there once
every few weeks and have a go at it.

Someone here - maybe Jarkka - referred me to a source of this
document, which states it is for 1994 850, 940, 960 Turbo & non-turbo
models. I think the 1993 should be similar, and I cannot find a 1993
document.

I have checked the oil level - it's okay.

On the 11th page of that 17-page document, there are some confusing
instructions for testing the voltage on the ignition coil.

It seems to tell what the voltage should "NOT" be rather than what it
should be. I get battery voltage on the red wire, and while cranking,
I get about 10-11 volts on the blue wire. Does this mean the coil and
power transistor are okay? What should this voltage be on a 1993 850?

The resistance in the crank sensor when removed from the engine is 440
ohms, so it should be okay, I guess.

What should I do next? I'm kind of at a standstill till I get some
idea if the coil is okay.

Thanks, Tom

 

[Happy Trails]

I forgot to mention - I got codes 214, 314, and 324 on socket A6 when
I first read them, but these codes could have been there for a long
time and not necessarily related to the present non-start condition -
dunno!

After I cleared them and tried to restart the car, I only got code 111
???!!

 

[Tim..]

I forgot to mention - I got codes 214, 314, and 324 on socket A6 when
I first read them, but these codes could have been there for a long
time and not necessarily related to the present non-start condition -
dunno!

After I cleared them and tried to restart the car, I only got code 111
???!!

As no codes seem to be set after cranking i think we can rule out the Cam
sensor (which is required for a start on this engine) but another favourite
is the ign amplifier bolted to the coil.

Look for some primary switching on pin 2 of the connector at this, which is
the signal from the ecu, and pin 5 carries the output to the coil which
should both be present under cranking.

Tim..

 

[Happy Trails]

As no codes seem to be set after cranking i think we can rule out the Cam
sensor (which is required for a start on this engine) but another favourite
is the ign amplifier bolted to the coil.

Look for some primary switching on pin 2 of the connector at this, which is
the signal from the ecu, and pin 5 carries the output to the coil which
should both be present under cranking.

Hi Tim

By ign amplifier are you referring to the round metal-cased electronic
component that looks like a large power transistor soldered into the
mounting bracket for the coil?

How do I identify which pins are which (2 and 5) on this component as
the pins are not accessible without removing the component from its
mounting?

Thanks,

- Tom