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Cranks but not start

Tiny
ANDY AKAS
  • MEMBER
  • 1997 MAZDA 626
  • 2,230,000 MILES
Alternator problem, after fixed and tested ok, the electrician about changing the battery when the engine is running asked me to raise the throtle while removing the terminal of the battery, immediately it resulted to a high voltage and the car refuse to start again. We have tried the plug but it did not produce shock. Could this kind of problem affect the pcm? If yes can the pcm be repair? Because when the pcm is fixed, the battery, oil and ABS indicator lights appears on the dashboard. Pls assist me
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Friday, August 10th, 2012 AT 5:46 AM

10 Replies

Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
Whydid he want to remove the battery cable while it was running?Thats a good way to spike and ruin the pcm you cant remove the battery cable while the car is running on a computer controled car. Have you checked all the fuses?
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Friday, August 10th, 2012 AT 7:09 AM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
The guy is not a qualified electrician. He should not have done that.
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Friday, August 10th, 2012 AT 7:20 AM
Tiny
ANDY AKAS
  • MEMBER
  • 10 POSTS
We have checked all the fuses, they are ok
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Friday, August 10th, 2012 AT 7:38 AM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Is the engine running now?
Did you check the charging of the alternator? You need a voltmeter to do that.
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Friday, August 10th, 2012 AT 7:57 AM
Tiny
ANDY AKAS
  • MEMBER
  • 10 POSTS
It is not running, no spark in d plug, when ignition is on, the vehicle with a key logo don't appear on the dashboard. It is only the ABS, battery and oil logo that appears
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Friday, August 10th, 2012 AT 8:20 AM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Remove the PCM and check the circuitboard for signs of shorting and burnt smell.
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Friday, August 10th, 2012 AT 9:10 AM
Tiny
ANDY AKAS
  • MEMBER
  • 10 POSTS
I have done that, there is no smell of burnt and no shorting
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Friday, August 10th, 2012 AT 9:21 AM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Let us start all over again with the basics.
Which engine do you have?
Do you have a voltmeter or test light?
Does the Check Engine Light comes on when ignition switch is turned on?
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Friday, August 10th, 2012 AT 9:33 AM
Tiny
ANDY AKAS
  • MEMBER
  • 10 POSTS
V4, test lamp, engine check light don't on when ignition is on
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Friday, August 10th, 2012 AT 10:02 AM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Attached are the PCM schematics.
At the PCM, turn ignition switch on and ground terminal # 2 (Blue) with a test light and note if the MIL comes on.

Turn O/D on/off and note if the indicator in dash works.

If answer is NO to both above, check Meter Fuse (15 A ) underdash.
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Friday, August 10th, 2012 AT 10:35 AM

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