rickyhils

I found the problem. Loose fitting negative push on clip at starter motor was disconnected. Must have jumped off when engine backfired. With old cars there is always a long list of possible failure points that can show up.

1991 Loyale non-turbo won't crank. All other electric is ok. Happened after driver side timing belt broke. and loud backfire. Clutch safety switch ok. And have learned that EA82 is non interference design. SPFI. Have looked at Haynes book. all four fusible links next to battery are ok.

And Dave T. Thanks for your reply.

More Re: ECU story. It is ironic that the CEL remained off for last weeks smog test. My electronics guru friend suspects that when old EGR solenoid when bonkers with high and low ohm readings it also created voltage spikes that messed up the ECU. With no Hitachi schematic available, opening ECU case showed EGR solenoid return wire going directly to that UPA1478H which is what pulls down to ground the 12v reference input that first is fed into the EGR solenoid. It was only allowing 7 volts at solenoid connection. And, I am in California. I failed smog last week with CO% at 0.90 (max allowed is 0.66 ). I addressed what my mechanic diagnosed, and I put new CARB approved cats welded on for $440.00 parts and labor. Cat was clogged due to a coolant leak into cylinders and overheating. Problem was that double horseshoe coolant gasket under the throttle body. At one point driving up a grade at highway speed gave symptoms of fuel pressure problem, but was clogged cat. I have to say the exhaust smell a lot better now. When I pass smog next week I will investigate rebuilding an extra EA82 (SPFI non-turbo) . Car is at 310k miles. I will not see it go to the crusher till at least 400k (or 500k?) .

I just fixed my 1991 Loyale ECU. New EGR solenoid was still showing code 34. All wire paths checked ok. The fix is this: Open Hitachi ECU box and go to the first 10 pin transistor IC array. The EGR solenoid wire returns directly there. IC It will be UPA1478H. ECU now good to go. Other symptom I had showed 7 volts at EGR solenoid connection (ignition on /engine off) . Should have been 12 v.