Code No.51: Valve
Relay ON Defective
OPERATION
- The solenoid valve is always energised through the ABS-ECU internal valve
relay.
- The ABS-ECU activates the solenoid valve by turning ON its valve
relay.
DIAGNOSIS CODE SET CONDITION
The solenoid valve remains to be
energised when the ABS-ECU turned the valve relay to
OFF. (Short in the solenoid valve circuit)
PROBABLE CAUSES
The most likely causes for these diagnosis codes
to set are:
- Damaged wiring harness and connector
- Malfunction of the valve relay
- Malfunction of ABS-ECU
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STEP 1. Check the valve relay.
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Refer to  .
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Q.
Is the check result normal?
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 Go to Step 2.
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 Replace the valve relay. Then go
to Step 7.
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STEP 2. Voltage measurement at ABS-ECU connector D-250.
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Prior to the voltage inspection, check the ABS-ECU
connector D-250 and the valve relay
connector B-17X. Repair if necessary.
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(1)Disconnect the connector D-250.
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(2)Turn the ignition switch to the "ON" position.
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(3)Measure the voltage between terminal No.37 and
earth.
OK: System voltage
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Q.
Is the check result normal?
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Go to Step 3.
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Repair
the wiring harness between the valve relay connector B-17X terminal No.
1 and the ABS-ECU connector D-250 terminal No. 37.
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STEP 3. Inspect the wiring harness between the ABS-ECU connector D-250
and the valve relay connector B-17X.
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| caution |
When using the circuit tester for inspection, be
sure to apply
the voltage in a correct direction to the inspection terminal because
the diode is mounted between
the terminals.
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Prior to the voltage inspection, check the ABS-ECU
connector D-250 and the valve relay
connector B-17X, and repair if necessary.
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ABS-ECU connector D-250 terminal No.50 (circuit
tester: +) - valve relay
connector B-17X terminal No. 2 (circuit tester: -)
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OK: Continuity exists (2 Ω or
less)
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Q.
Is the check result normal?
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Go to Step 4.
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Repair
or replace it.
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STEP 4. Check the harness wires between valve relay connector B-17X
and earth.
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| note |
Prior to the voltage inspection, check the valve
relay connector B-17X, and repair if
necessary.
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Valve relay connector B-17X terminal No.4
- earth
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OK: Continuity exists (2 Ω or
less)
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Q.
Is the check result normal?
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Go to Step 5.
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Repair
or replace it.
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STEP 5. Voltage measurement at valve relay connector
B-17X.
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| note |
Prior to the voltage inspection, check the valve
relay connector B-17X, and repair if
necessary.
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(1)Disconnect the connector B-15X.
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(2)Turn the ignition switch to the "ON" position.
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(3)Measure the voltage between terminal No.5 and
earth.
OK: System voltage
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Q.
Is the check result normal?
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Go to Step 6.
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Repair
or replace it.
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STEP 6. Check whether the diagnosis code is reset.
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Check again if the diagnosis code is
set.
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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 reset.
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(6)Turn the ignition switch to the "LOCK" (OFF)
position.
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Replace the ABS-ECU. Then go to
Step 7.
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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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STEP 7. Check whether the diagnosis code is reset.
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Check again if the diagnosis code is
set.
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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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Repeat the troubleshooting from
Step 1.
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The
procedure is complete.
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