Code No. B1762 IOD fuse not seated fully
Code No. B1765 ECU
fuse
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Before replacing the ECU, ensure that the power supply
circuit, the earth circuit and the communication circuit are
normal.
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TROUBLE JUDGEMENT
- When voltage at the power supply fuses (fuse Nos. 25 and 26) drops below
5 V with the ignition switch ON and ACC OFF signal is detected for 500
milliseconds, the ETACS-ECU sets diagnosis code No. B1762.
- When voltage at the ECU fuse (fuse No. 26) drops below 5 V with the
ignition switch ON and ACC ON signal is detected for 500 milliseconds, the
ETACS-ECU sets diagnosis code No. B1765.
PROBABLE CAUSES
- Malfunction of fuse No. 25
- Malfunction of fuse No. 26
- Malfunction of the ETACS-ECU
- Malfunction of the KOS&OSS-ECU <Vehicles with
KOS>
- Damaged harness wires and connectors
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STEP 1. Check the power supply fuses (fuse Nos. 25 and 26)
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Check the power supply fuses (fuse Nos. 25 and
26). (Refer to GROUP 00 - How to Use Troubleshooting/Inspection
Service Points - Inspection Service Points for a Blown Fuse  .)
Q.
Is the fuse in good condition?
 Go to Step 2.
 Then go to Step
5.
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STEP 2. Check of short to power supply, short to earth, and open
circuit in ETACS +B line between fusible link and ETACS-ECU
connector
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Q.
Is the check result normal?
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YES <vehicles with KOS> : Go to Step
3.
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YES <vehicles without KOS> : Go to Step
4.
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NO : Repair the connector(s) or
wiring harness. Then go to Step 5.
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STEP 3. Check the M.U.T.-III Diagnosis code for other
systems
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Check whether the KOS&OSS-ECU sets a
diagnosis code.
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Q.
Is the diagnosis code set?
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Diagnose the KOS&OSS-ECU (Refer
to GROUP 42B, Troubleshooting ).
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Go to Step 4.
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STEP 4. Check of short to power supply, short to earth, and open
circuit in ACCI line between ignition switch (ACC) <vehicles without
KOS> or ACC relay connector <vehicles with KOS> and
ETACS-ECU connector
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Q.
Is the check result normal?
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Go to Step 5.
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Repair the connector(s) or wiring
harness. Then go to Step 5.
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STEP 5. Check whether the diagnosis code is set again.
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Check again if the diagnosis code is set in the
ETACS-ECU.
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(1)Erase the diagnosis code.
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(2)Turn the ignition switch from "LOCK" (OFF) position to
"ON" position.
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(3)Check if diagnosis code is set.
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Q.
Is the diagnosis code set?
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Replace the ETACS-ECU (Refer to GROUP
54A - ETACS, ETACS-ECU ).
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If the
trouble symptom is resolved, an intermittent malfunction such as poorly
engaged connector(s) or wiring harness is suspected. (Refer to GROUP 00
- How to Use Troubleshooting/Inspection Service Points -
How to Cope with Intermittent Malfunction .)
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