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740 GLE No start - Guess that problem 700 1987

Hi, my name is Nelson.

My 1987 VOLVO 740 GLE (B230F/AW71 LH-Jetronic/EZ-117K) died the other day.

I just tied up the wires inside the left front kick panel with the bendable metal wrap.

The car had been running less the 5 minutes.

As I was nearly stopped coming up to a red light, my car quit running.

There was no indication of anything wrong, my dash lights just suddenly lit.

I attempted to restart the car with no luck, but it does crank just fine.

None of the wire connections in the connectors found inside the left front kick panel

appear to be loose or pushed back/away from each other upon visual inspection.

All grounds that I know to check are good under 12v light bulb load test.

L and R fender, Ign. module/power stage base, Intake manifold, Pass. kick panel

The Tach. does NOT move when the engine is cranked.

The fuel injectors do NOT click when the engine is cranked.

The fuel pumps run when I jumper fuel relay terminals 30 and 87/2 so the wires are good.

However, they do not appear to run when the ignition is initially turned on (position II).

They also do not appear to run when the engine is cranked (ignition position III).

This was confirmed when I pulled the front spark plug and found it dry.

I had just cranked it for several seconds while pumping and holding down the gas.

I am not getting a spark from the ignition coil wire.

I can't be sure if the coil is bad since the manuals I have give differring Ohm specs.

The Haynes manual (ISBN 1-85010-550-2) says one thing:

Primary = 0.5 to 0.9 ohm Secondary = 6.0 to 9.5 ohms

The Chilton manual (ISBN 0-8019-7944-7) says a few different things:

Primary = 1.2 +/- 0.1 Ohms Secondary = 8.5 +/- 0.8 K Ohms [pg. 89]

Primary = approx. 1 - 2 ohm [pg. 68]

My Ohmmeter gives me a reading of:

Primary = 0.8 Ohms Secondary = 7.6 K Ohms

Page 68 of the Chilton manual is the ignition troubleshooting flowchart.

The chart states there should be a voltage drop across coil terminal 1 and ground.

It says the voltmeter reading should be 0.5 - 2.0 volts. I get a reading of 11.89 volts.

I get the same voltage reading from here as I do from coil terminal 15 and ground.

The chart suggests that I check the "electronic module" terminal 15, 16, and 31.

This is the only place in either manual where an "electronic module" is mentioned.

(except for a crude diagram on pg. 69 of the Chilton manual)

From the diagram on pg. 69 of Chilton, it appears the flowchart (pg. 68 of Chilton)

is referring to what Haynes calls the "power stage" in its diagrams (pg. 132).

However, this thing only has 5 wires running to it (both books agree here).

The wires are labeled 1-5 (Haynes got this right/Chilton is blank) but no 15, 16, or 31.

Coil terminal wires 1 & 15 ARE connected to the "power stage" (#1 and #4) and are live.

BTW: What does the same voltage on coil terminals 15 and 1 indicate?

The Chilton chart's "electronic module" being the EZ-117K control unit makes less sense.

There is no terminal labeled 31 (ground) on the EZ-117K and coil terminal wire 1 does not

run to the EZ-117K (nor does wire 15 directly) as is shown in the Chilton diagram (pg. 69).

EZ-117K terminal 6 (blue) is live 12v and another blue wire exists, terminal 24.

Terminal 24 (blue) is live 5v and comes grouped with other wires, one red, one bare.

The red wire companion is terminal 4 and it is live with 10v. The bare wire has mV.

Maybe someone will be able to clarify this conflicting information.

I do not yet know how to test the ign. module/power stage or the EZ-117K for certain.

From what I have learned this is sounding more and more like the Hall Effect Sensor.

I have been told about a radio interferance relay. Can these be tested/repaired?

I also looked for a fuel pump inline fuse but I counldn't find one.

Hope this info. helps someone understand this problem better.

Thank You.







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New 740 GLE No start - Guess that problem [700][1987]
posted by  someone claiming to be Nelson  on Mon Oct 23 13:23 CST 2000 >


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