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1994 Subaru Loyale won't Start -- NO C.E.L. Light on Dash

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1994 Subaru Loyale -- that will NOT Start --

1.8 engine - Throttle body Fuel Injected

4WD

Standard Transmission

Fuel Pump comes on...

Has NO spark...

 

Appears to be an Intermittent electrical issue -- 

Several times in the last few weeks it would not start -- & then is would after a bit...

It got me home and now it will not start at all...

Turns over Fine -- Checked timing belts -- Distributor's Rotor Turns fine with cap off...

[screw is tight in Rotor]

Changed coil & ignition unit

Changed Distributor -- with NEW Cap and Rotor

Changed relays above Computer!

-------------------------

Noticed something here:

NO lights on Computer! -- LED Light Blinks NOTHING?

Also -- when you first turn the key on; -- NO [C.E.L.] on Dash -- before starting:

I have a 1992 Loyale that runs fine -

- when you first turn the key -- Lights on Dash are: Charge & Oil on Left ---- then Brake Fluid & Check Engine on Right--

NOT on the non-running 1994 Loyale -- Charge on Left -- NO Oil light -- on Right just the Brake Fluid light no C.E.L.

[pulled dash & checked all the bulbs too...]

Changed THREE different Computers all act the same way!?

NO blinking led light on computer -- not five or seven pattern -- NOTHING...

Something not right there...

PLEASE --

Let me know what direction I should to go in now?

Thanks in ADVANCE for all of the time and consideration that goes into the Replys!

VTSCOOBY-

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If the CEL isn't lit, and multiple computers act this way, then you have a power/ground issue. Check all the power and ground circuits to the ECM.

GD

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I have a Haynes manual w a supplement added to the manual for GL-10 Cars -- [all carburated] Not great for a ECM wiring diagram for Throttle Body Fuel Injected Loyale -- any better info available for the Power & Ground wiring for ECM on a Loyale? --

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LoL. I haven't done electrical troubleshooting on a Loyale in probably more than a decade. Not that I would commit such things to memory for more than an afternoon anyway.... not very useful in the grand scope of things. You need a diagram. Find a factory service manual on ebay. 

GD

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Need a FSM,  and a voltmeter.  Check for power, check for grounds.

ebay, or someone may have a link to a scan.

 

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Hmmm GD often tells people to go with a newer EJ powered something....but your Loyale is newer than some EJ stuff !

So, deffo no spark and starting spray of choice does nothing?

 

The parts you are changing in, coil and igniter I think it is on coil bracket - know they work?

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Have you checked the fusible links? Give them all a good wiggle and pull.

Next pull the ground off by the starter and clean both sides. Next do the same with the engine to chassis ground by the battery.

The odd one is no oil light. Pretty sure that's completely separate from the computer.

 

Also there are no PDFs of a wagon wiring. There is only XT manuals online. 

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Fusible links and ignition relay.

Check voltage at coil + while cranking

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Also make sure the coil bracket has good ground. The ignition transistor uses the bracket as ground.

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On 10/18/2020 at 6:19 PM, GeneralDisorder said:

If the CEL isn't lit, and multiple computers act this way, then you have a power/ground issue. Check all the power and ground circuits to the ECM.

GD

-- All Plug F#'s are Referred to from the supplement section of a;

-- 1980 to 1989 -- 1600/1800 SUBARU Haynes Manual; Wiring Diagram;

[ ISBN# 1 85010 527 8 ]   -- [Library of Congress Card Catalog # 88-81715]

CORRECT !!!-- Power to the ECM "the computer" -- has Three Plugs

  [24Pin Plug #F106] ~ [10 Pin Plug #F107] ~ [18Pin Plug #F108]

Power was correct & present on Plugs # F107 & F108 to the ECM

But... on the ECM's [24 Pin Plug #F106] -- There was power missing on Pin #28 +#29 +#41

#29 & #41 are White Wires

#28 is Green w White Stripe

[Pin # 38 on the same #F106 Plug has a Red w Blue Stripe Wire marked RL]

 This "RL" #38 Pin had the power it should...

TRACING these wires [W=White ~ GW = Green w White stripe ~ RL = Red w Blue Stripe]

They led back to the [#F79 Ignition Relay] [w W + GW + RL Wires going to it]

AND +++ the #F109 DIODE -- [w RL & GW Wires going to it]

As mentioned; I had changed the Ignition Relay once already...

I had even unplugged & re-plugged the #F109 DIODE...

When i went to REPLACE the #F109 Diode with one from a junk car...

The RED with Blue striped wire BROKE off the Connector for the DIODE...

WONDERFUL: Actual PROBLEM FOUND +:-) !!!

Went back to the junk car and cut the wiring harness Plug for DIODE #F109 out;

Soldiered the RL & GW Wires &+++ Shrink wrapped them up for this F#109 plug --

Then put the DIODE back in ... TURN the KEY!!!~

Check Engine light BACK ON !!!

ECM or "the computer" Blinked it's 5 pulse pattern:

& the SUBARU Loyale;  "once again" started up & purrs like a kitten!

What a beautiful thing!
THANK you ALL for your time and considerations!

PEACE & BEST REGARDS

vtscooby

 

 

 

 

 

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The Brown "Ignition Relay" above the ECM -- it is in the same circuit as that -

All just below the steering column in the Loyales

- it has [RL & GW] connecting wires... & is just up the wiring harness about 8 or 10 inches from the "Ignition Relay"...

Marked "DIODE" & Plug #F109 in Haynes Wiring Diagram

NOTE: BOTH of the DIODES worked:

the problem was the RL wire [Red w Blue Stripe] had broken;

it was an intermittent issue while it flexed around inside the plastic wrapping -- until it failed in my drive [she did not make me walk]

That RL wire broken made the Check Engine Light FAIL to come on...

ALSO; the ECM "the computer"  would NOT cycle it's LED 5 pulse CODE with KEY ON --

LED on ECM stayed dark

Which all led to NO Spark & would NOT Start ISSUE...

hope that helps

Thanks again!

vtscooby

Edited by vtscooby
clearification

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