Code No.41, 42, 43, 44: Control Solenoid Valve (FR, FL, RR, RL)
System
Code No.45, 46, 47, 48: Switch Solenoid Valve (SA1, SA2, SA3,
STR) System
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If there is any problem in the CAN bus lines, an
incorrect diagnosis code may be set. Diagnose the CAN bus lines before the
diagnosis codes (Refer to GROUP 54D, CAN bus-line diagnostic flow  ).
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OPERATION
HBB is supplied with power for drive of each solenoid
valve from the fusible link No. 31 by turning ON the valve relay, and the
drive of each solenoid valve is controlled by ASTC-ECU.
DIAGNOSIS CODE SET CONDITIONS
Diagnosis codes No. 41, 42, 43, 44,
45, 46, 47, and 48 are set in the following cases;
- Although the solenoid valve is turned ON by ASTC-ECU, ASTC-ECU not judges
that current flows through the solenoid valve.
- Although the solenoid valve is turned OFF by ASTC-ECU, ASTC-ECU judges
that current continues to flow through the solenoid valve.
PROBABLE CAUSES
The most likely causes for these diagnosis codes
to set are:
- Damaged wiring harness or connector
- Malfunction of the solenoid valve
- Malfunction of the ASTC-ECU
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STEP 1. M.U.T.-III CAN bus diagnostics
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Before connecting or disconnecting the M.U.T.-III,
turn the ignition switch to the "LOCK" (OFF) position.
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(1)Connect M.U.T.-III to the 16-pin diagnosis
connector.
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(2)Turn the ignition switch to the "ON" position.
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(3)Diagnose the CAN bus line.
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(4)Turn the ignition switch to the "LOCK" (OFF)
position.
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Q.
Is the check result normal?
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 Go to Step 3.
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 Repair the CAN bus line (Refer to
GROUP 54D, CAN bus line Diagnostic flow ). Then go to Step 2.
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STEP 2. Check whether the diagnosis code is reset.
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Before connecting or disconnecting the M.U.T.-III,
turn the ignition switch to the "LOCK" (OFF) position.
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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)Disconnect the M.U.T.-III.
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(6)Drive the vehicle more at the speeds exceeds 10 km/h to
execute the valve initial check.
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(7)Check if the diagnosis code is set.
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(8)Turn the ignition switch to the "LOCK" (OFF)
position.
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Q.
Is code No.41, 42, 43, 44, 45, 46, 47 or 48 set?
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Go to Step 3.
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The
procedure is complete.
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STEP 3. Check HBB connector B-106, HBB connector B-108, ASTC-ECU
connector D-232 and ASTC-ECU connector D-233 for loose, corroded or
damaged terminals, or terminals pushed back in the
connector.
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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 the damaged
component(s). Then go to Step 7.
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STEP 4. Resistance measurement at HBB connector B-106 and
B-108.
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Measure the resistance between the terminals of
each solenoid valve at HBB connector B-106 and B-108 (equipment side)
(Refer to ).
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Q.
Is the check result normal?
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Go to Step 5.
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Replace the HBB. Then go to Step
7.
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STEP 5. Check the harness wires between HBB connector B-106 and
ASTC-ECU connector D-232, D-233.
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Check the wiring harnesses between the
following terminals.
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Code No.41
- HBB connector B-106 (terminal No.19) - ASTC-ECU connector D-232
(terminal No.42)
- HBB connector B-106 (terminal No.20) - ASTC-ECU connector D-232
(terminal No.43)
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Code No.42
- HBB connector B-106 (terminal No.21) - ASTC-ECU connector D-233
(terminal No.10)
- HBB connector B-106 (terminal No.22) - ASTC-ECU connector D-233
(terminal No.3)
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Code No.43
- HBB connector B-106 (terminal No.15) - ASTC-ECU connector D-233
(terminal No.2)
- HBB connector B-106 (terminal No.16) - ASTC-ECU connector D-233
(terminal No.1)
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Code No.44
- HBB connector B-106 (terminal No.13) - ASTC-ECU connector D-232
(terminal No.44)
- HBB connector B-106 (terminal No.14) - ASTC-ECU connector D-232
(terminal No.45)
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Code No.45
- HBB connector B-106 (terminal No.18) - ASTC-ECU connector D-233
(terminal No.7)
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Code No.46
- HBB connector B-106 (terminal No.17) - ASTC-ECU connector D-233
(terminal No.8)
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Code No.47
- HBB connector B-106 (terminal No.12) - ASTC-ECU connector D-233
(terminal No.6)
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Code No.48
- HBB connector B-106 (terminal No.11) - ASTC-ECU connector D-233
(terminal No.5)
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Q.
Is the check result normal?
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Go to Step 6.
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Repair the wiring harness. Then
go to Step 7.
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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)Disconnect the M.U.T.-III.
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(6)Drive the vehicle more at the speeds exceeds 10 km/h to
execute the valve initial check.
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(7)Check if the diagnosis code is reset.
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(8)Turn the ignition switch to the "LOCK" (OFF)
position.
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Q.
Is code No.41, 42, 43, 44, 45, 46, 47 or 48 set?
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Replace the ASTC-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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(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)Disconnect the M.U.T.-III.
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(6)Drive the vehicle more at the speeds exceeds 10 km/h to
execute the valve initial check.
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(7)Check if the diagnosis code is set.
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(8)Turn the ignition switch to the "LOCK" (OFF)
position.
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Q.
Is code No.41, 42, 43, 44, 45, 46, 47 or 48 set?
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Repeat the troubleshooting from
Step 1.
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The
procedure is complete.
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