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2010 Toyota Matrix suddenly lost power steering after

Customer Question
turning out of drive thru...
2010 Toyota Matrix suddenly lost power steering after turning out of drive thru. Battery light on, was able to drive home before losing all power. Bosch battery is 13 months old. Had battery tested and recharged at Pep Boys and checked out fine. Today we replaced the alternator and put the fully wall charged battery back in. Still having power issues. Battery charger and alternator testER we purchased indicated low voltage output at alternator. New one didn't fix the issue.
Submitted: 2 years ago.Category: Toyota
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Customer reply replied 2 years ago
Any suggestion that I could attempt myself would be great since I'm not out the money for the alternator that didn't need replacing
Answered in 6 hours by:
1/25/2016
Toyota Mechanic: Matt, Mechanical Engineer replied 2 years ago
Matt
Matt, Mechanical Engineer
Category: Toyota
Satisfied Customers: 23,450
Experience: BEng, Repaired my own cars and others for 20 years, worked in Formula 1 for 10 years
Verified

Hello

I'd first check the easy things like is the boot light or any other interior light staying on then check that the main battery connections are tight and in good condition also check the earth strap to the engine / gearbox.

Next I'd check the current drain aspect, the best way to find what circuit is causing the excessive currant drain is to fit a current sensing multimeter in series with the positive battery lead on the car and the battery, or use a current clamp meter on the battery positive cable.

A typical current drain with everything off and un-alarmed should be around 0.05Amp and if its higher than this remove a fuse and re-measure, if measurement doesn't change then replace the fuse and remove the next.

Once you've isolated the circuit with the excessive drain check the wiring connections and plugs to components and the wiring harness that runs by the engine bay fuse box - the wiring harness chaffs / rubs through and gets damaged - but its not always easy to see so be careful when checking..

Also check that the alternator is actually charging the battery in the car by taking a battery voltage reading with the engine off then another with the engine running. The 2nd reading should be higher than the 1st and climbing steadily. And also check that the alternator is secure to the engine as this provides the ground for the charging circuit and make sure that the engine / gearbox earth strap is secure and the contacts are clean and bright.

also check teh connection of the alternator harness especially the small wires that run back to the ECU as its this that switches the alternator over to charging

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