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DTC U1415: Coding
Not Completed
| caution |
If DTC U222C is set in the A/C-ECU
or heater control unit <vehicles without A/C>, diagnose the CAN main bus line.
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| caution |
Whenever the ECU is replaced, ensure that the communication
circuit is normal.
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TROUBLE JUDGMENT
The A/C-ECU or heater control unit <vehicles without A/C> receives the vehicle
information signals from the ETACS-ECU via the CAN bus lines. If incorrect global coding data
is received or coding data cannot be received with the ignition switch turned ON when the coding
confirmation is completed, diagnostic trouble code B222C is stored.
TROUBLESHOOTING HINTS
- Malfunction of the ETACS-ECU
- Malfunction of the A/C-ECU or heater control unit <vehicles without
A/C>
- Damaged harness wires and connectors
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Required Special Tools:
- MB991223: Harness Set
- MB992006: Extra Fine Probe
- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: V.C.I.
- MB991827: M.U.T.-III USB Cable
- MB991910: M.U.T.-III Main Harness A
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STEP 1. Using scan tool MB991958, diagnose the CAN bus line
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(1)
| caution |
To prevent damage to scan tool MB991958, always turn the ignition switch
to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
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Connect scan tool MB991958. Refer to "How to connect the Scan Tool (M.U.T.-III)  ."
(2)Turn the ignition switch to the "ON" position.
(3)Diagnose the CAN bus line.
(4)Turn the ignition switch to the "LOCK" (OFF) position.
Q.
Is the CAN bus line found to be normal?
 Go to Step 2.
 Repair the CAN bus line. (Refer to GROUP 54C, Diagnosis ).
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STEP 2. Using scan tool MB991958 read the ETACS-ECU diagnostic trouble
code.
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Check whether an ETACS DTC.
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(1)Turn the ignition switch to the "ON" position.
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(2)Check for the DTC related to the ETACS-ECU.
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(3)Turn the ignition switch to the "LOCK" (OFF) position.
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Diagnose the ETACS-ECU (Refer to GROUP 54A, Diagnostic Trouble Code ).
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Go to Step 3.
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STEP 3. Using scan tool MB991958, check for any diagnostic trouble
code.
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Check if a DTC, which relates to CAN communication-linked systems below, is set.
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- WCM <vehicles with WCM>
B2204: Coding data unmatched
- KOS <vehicles with KOS>
B2204: Coding data unmatched
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(1)Turn the ignition switch to the "ON" position.
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(2)Check for a DTC related to the relevant system.
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(3)Turn the ignition switch to the "LOCK" (OFF) position.
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Go to Step 5.
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Go to Step 4.
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STEP 4. Recheck for diagnostic trouble code.
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Check again if the DTC is set.
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(1)Turn the ignition switch to the "ON" position.
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(2)Check if the DTC is set.
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(3)Turn the ignition switch to the "LOCK" (OFF) position.
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Replace the ETACS-ECU. On completion, check that the DTC is not reset.
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A poor connection, open circuit or other intermittent malfunction is present in
the lines between the ETACS-ECU and the A/C-ECU or heater control unit <vehicles
without A/C> (Refer to GROUP 00E, Harness Connector Inspection ).
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STEP 5. Recheck for diagnostic trouble code.
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Check again if the DTC is set.
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(1)Turn the ignition switch to the "ON" position.
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(2)Check if the DTC is set.
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(3)Turn the ignition switch to the "LOCK" (OFF) position.
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Replace the A/C-ECU or heater control unit <vehicles without A/C>.
On completion, check that the DTC is not reset.
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A poor connection, open circuit or other intermittent malfunction is present in
the lines between the ETACS-ECU and the A/C-ECU or heater control unit <vehicles
without A/C> (Refer to GROUP 00E, Harness Connector Inspection ).
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)