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Home/DTC Codes/Mazda/MPV/1990-1998 3.0L V6/P1600
P1600

Loss of KAM Power Circuit Open

1990-1998 Mazda MPV 3.0L V6

Low SeverityPowertrain

Description

The PCM has detected a loss of Keep Alive Memory power. The KAM circuit maintains battery voltage to the PCM to preserve adaptive learning values, fuel trims, and DTC history when the engine is off.

Symptoms

  • Check Engine Light
  • Poor idle after battery reconnect
  • Transmission shifts harshly initially
  • Fuel economy temporarily reduced

Common Causes

  • Blown KAM fuse
  • Corroded battery terminal
  • Wiring open in KAM circuit
  • Faulty PCM power relay
  • Battery cable issue

Diagnostic Steps

  1. Check KAM fuse
  2. Inspect battery terminals for corrosion
  3. Test battery voltage
  4. Check wiring from battery to PCM KAM circuit
  5. Verify PCM power relay

Repair Notes

Replace the blown KAM fuse; clean battery terminals; repair wiring in the KAM circuit.

Related Codes

P1605PCM Keep Alive Memory Test FailureP1605PCM Keep Alive Memory Test FailureP1605PCM Keep Alive Memory Test FailureP1605Knock Control CPU MalfunctionP1605PCM Keep Alive Memory Test ErrorP1605Knock Control CPU MalfunctionP1605Knock Control CPU MalfunctionP1605A/T Diagnostic Communication LineP1605A/T Diagnostic Communication LineP1633Ignition Supply Power Circuit Low VoltageP1633Ignition Supply Power Circuit Low VoltageP1633Ignition Supply Power Circuit Low VoltageP1633Ignition Supply Power Circuit Low VoltageP1633Ignition Supply Power Circuit Low VoltageP1633ECM Malfunction ETCS CircuitP1633ECM Malfunction ETCS CircuitP1633Keep Alive Power Voltage Too LowP1633ECM Malfunction ETCS CircuitP1633Keep Alive Power Voltage Too LowP1633KAM Voltage Too LowP1633Keep Alive Power Voltage Too LowP1633Ignition Supply Power Circuit Low VoltageP1633Ignition Supply Power Circuit Low VoltageP1633Ignition Supply Power Circuit Low Voltage

Other Powertrain Codes

P1600 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 P1600 mean on a 1990-1998 Mazda MPV?

P1600 stands for "Loss of KAM Power Circuit Open". The PCM has detected a loss of Keep Alive Memory power. The KAM circuit maintains battery voltage to the PCM to preserve adaptive learning values, fuel trims, and DTC history when the engine is off.

What are the symptoms of P1600 on a Mazda MPV?

Common symptoms of P1600 include: Check Engine Light, Poor idle after battery reconnect, Transmission shifts harshly initially, Fuel economy temporarily reduced.

What causes P1600 on a 1990-1998 Mazda MPV?

Common causes of P1600 include: Blown KAM fuse, Corroded battery terminal, Wiring open in KAM circuit, Faulty PCM power relay, Battery cable issue.

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