2000 626 possible PCM trouble - Mazda Forum - Mazda Enthusiast Forums


Mazda 323,Mazda 626 & Mazda 929 Whether the compact 323, the mid sized 626, or the full sized 929, these vehicles remain very popular even though production has stopped.

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Old 10-17-2016, 08:12 PM
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Default 2000 626 possible PCM trouble

Car stalled while driving. Verified fuel pump will create 45 psi, tested relays, and verified all fuses good. Tried two different code readers and they will not communicate with the PCM. No spark and no fuel pressure with key in crank position. Any suggestion?
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Old 10-19-2016, 06:53 AM
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Does the engine crank over? Do you have a second key to try?
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Old 10-19-2016, 03:17 PM
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I do not have another key. It does turn over but as stated no spark and no fuel. I have tested to main relay and fuel relay and they are good.
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Old 10-20-2016, 06:07 AM
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I would be looking to see if the immobiliser is at fault.
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Old 10-20-2016, 09:30 AM
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I have been using the free repair guides through AutoZone. I see the imobilizer in the wiring diagram but have not found a diagram with its location. Is it integrated into the PCM or a stand alone device. The wiring diagram also indicates that some cars do not have an imobilizer. How would I know if this car has one?
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Old 10-21-2016, 07:47 AM
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If fitted, it will be mounted on or beside the steering column.

Its rare to have a 626 thru the shop now days. I know on the Mazda 6 there is a red immobiliser light that flashes when the key is off, not sure if 626 is same.
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Old 10-25-2016, 04:38 PM
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I located the immobilizer. Made by Lucas; model is a 34AS or LC62 67 5G2. Is there a way to bypass this thing? If not what needs to be done to make a replacement immobilizer work with my PCM
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