ShopBaseFree forever shop management software for auto repair shops
Try ShopBase Free →
Home/DTC Codes/Mazda/Protege5/2002-2003 2.0L I4/P1633
P1633

KAM Voltage Too Low

2002-2003 Mazda Protege5 2.0L I4

Low SeverityPowertrain

Description

The PCM has detected that the Keep Alive Memory voltage is too low to maintain stored data. The PCM will lose adaptive values and must relearn when power is restored.

Symptoms

  • Check Engine Light
  • Loss of adaptive fuel trim values
  • Rough idle after restart
  • Transmission relearning shift points

Common Causes

  • Discharged battery
  • Corroded battery cables
  • Excessive parasitic drain
  • Blown KAM fuse
  • Faulty PCM power relay

Diagnostic Steps

  1. Test battery voltage with key off (should be above 12.4V)
  2. Inspect battery terminals for corrosion
  3. Check KAM fuse
  4. Test for parasitic drain
  5. Check PCM power relay

Repair Notes

Clean battery terminals; replace the battery if discharged; repair the KAM power circuit.

Related Codes

P1600Loss of KAM Power — Open CircuitP1600PCM Battery Direct Power CircuitP1600PCM Battery Direct Power CircuitP1600PCM Battery Direct Power CircuitP1600PCM Battery Direct Power CircuitP1600PCM Battery Direct Power CircuitP1600ECM Battery Backup CircuitP1600Loss of KAM Power Circuit OpenP1600ECM Battery Backup CircuitP1600ECM Battery Backup CircuitP1600Loss of KAM Power — Open CircuitP1600Loss of KAM Power — Open CircuitP1600PCM Battery Direct Power CircuitP1600PCM Battery Direct Power CircuitP1600PCM Battery Direct Power CircuitP1605PCM Keep Alive Memory Test FailureP1605Knock Control CPU MalfunctionP1605PCM Keep Alive Memory Test FailureP1605PCM Keep Alive Memory Test ErrorP1605PCM Keep Alive Memory Test FailureP1605A/T Diagnostic Communication LineP1605Knock Control CPU MalfunctionP1605A/T Diagnostic Communication LineP1605Knock Control CPU Malfunction

Other Powertrain Codes

P1633 on Other Vehicles

Mazda 626

1993-1997 2.0L I4

Mazda 626

1993-1997 2.5L V6

Mazda 626

1998-2002 2.0L I4

Mazda 626

1998-2002 2.5L V6

Mazda Axela

2013-2019 1.5L I4 P5-VPS

Mazda Axela

2013-2019 2.2L I4 Diesel SH-VPTS

Mazda B2300

1994-1997 2.3L I4

Mazda B2300

2002-2009 2.3L I4

Common Questions

What does code P1633 mean on a 2002-2003 Mazda Protege5?

P1633 stands for "KAM Voltage Too Low". The PCM has detected that the Keep Alive Memory voltage is too low to maintain stored data. The PCM will lose adaptive values and must relearn when power is restored.

What are the symptoms of P1633 on a Mazda Protege5?

Common symptoms of P1633 include: Check Engine Light, Loss of adaptive fuel trim values, Rough idle after restart, Transmission relearning shift points.

What causes P1633 on a 2002-2003 Mazda Protege5?

Common causes of P1633 include: Discharged battery, Corroded battery cables, Excessive parasitic drain, Blown KAM fuse, Faulty PCM power relay.

View Labor Times | View Torque Specs | View Fluid Specs