Code No.16: ABS-ECU
or valve relay power supply system (abnormal drop or increase in voltage)
OPERATION
The ABS-ECU is energised by the ignition switch (IG2) through valve relay and motor relay.
DIAGNOSIS CODE SET CONDITION
The ABS-ECU monitors the ignition switch (IG2) voltage and the voltage supplied to the
valve relay and motor relay. This diagnosis code is set when each voltage becomes less than
or more than the specified value. When the specified voltage is restored, the ABS warning lamp
goes out, and the diagnosis code is erased.
PROBABLE CAUSES
- Excessive electrical load
- Battery failure
- Damaged wiring harness or connector
- Malfunction of the ABS-ECU
- Charging system failed
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Refer to GROUP 54A - Battery Test  .
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Q.
Is the battery in good condition?
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 Go to Step 2.
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 Charge or replace the battery.
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STEP 2. Charging system check
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Refer to GROUP 16 - Charging System .
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Q.
Is the charging system in good condition?
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Go to Step 3.
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Repair or replace the charging system component(s).
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STEP 3. Check whether the diagnosis code is reset.
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(1)Turn the ignition switch to the "ON" position.
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(2)Erase the diagnosis code.
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(3)Turn the ignition switch to the "LOCK" (OFF) position.
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(4)Turn the ignition switch to the "ON" position.
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(5)Check if the diagnosis code is set.
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(6)Turn the ignition switch to the "LOCK" (OFF) position.
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Replace the ABS-ECU.
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It can be assumed that this malfunction is intermittent. Refer to GROUP 00, How
to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent
Malfunction .
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