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2001 Protege KAM P1633 code comes back after reset with scanner

Tiny
KLEINKEN1
  • MEMBER
  • 2002 MAZDA PROTEGE
  • 2.0L
  • 4 CYL
  • 2WD
  • MANUAL
  • 102,000 MILES
I recently replaced a seized alternator in a customers car and now the P1633 KAM low voltage code re-appears and radio and gauges do erratic things. The alternator light comes on while revving the engine too. I have checked all fuses. Alternator is charging.
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Monday, July 14th, 2014 AT 1:05 PM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,179 POSTS
If you are getting that code, the computer (PCM) is seeing 18+ volts from the alt or the battery is above 16 volts. You could have a faulty alt, a wiring issue between the alt and PCM, or a bad battery.

Run this test and let me know what you find.

KOER at idle, check voltage at the white/blue wire at the alt connection. It should be between 3v and 8v at idle.

Check voltage at the light green/white wire at alt connection. It should be 0.7v to 2v.

If the voltage at the connector are okay, you need to check the white/blue wire back to the PCM (pin 30) and the light green /white wire back to the PCM (pin53). You are checking for an open circuit or a short to power.

If all checks out correct there, check voltages at PCM pin 104. The same wires should produce the same voltage from the alt.

Let me know what you find.

Joe
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Monday, July 14th, 2014 AT 8:39 PM
Tiny
KLEINKEN1
  • MEMBER
  • 5 POSTS
I replaced the alternator this morning and it fixed the problem. It was overcharging the battery. Thanks for the info.
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Tuesday, July 15th, 2014 AT 4:16 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,179 POSTS
Glad you got it fixed. Let me know if you have questions in the future.

Joe
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Tuesday, July 15th, 2014 AT 9:41 PM

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