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Looking for an easy fix, if there is such a thing for my 93 ruby; service ASR light is on , switch ignition off and restart and it stays off for about an hour then on with an intermittent SES light, Pulled codes 22, 28,32,72 .I think that the only thing they have in common is the ECM. Anybody have any ideas???
First check the master cylinder, the low fluid level switch is very sensitive, if the level is down only slightly it can turn on the light.
Second suggestion is to acquire a factory service manual and trouble shoot the codes using the procedures detailed there starting with the lowest numbered code first, after repairing each one clear the memory with a battery disconnect and see if the others return. Best of luck.
I used the paper clip between A and G terminal the codes show as Module 4 H22,28, 32 &72. Module 4 is the ECM, code 22 isTPS signal voltage low , 28 is AC clutch relay fan relay or ECM,32 is egr valve or ECM, 72 is TCC solenoid or replace ECM, I do not have a FSM. I just thought that maybe someone else had the same problem and a fix