2018 / ECLIPSE CROSS / EC - Workshop Manual
13 -FUEL > 13A-DIRECT INJECTION AND MULTIPOINT FUEL INJECTION (DI AND MPI) > TROUBLESHOOTING > DIAGNOSIS CODE PROCEDURES > CODE NO. B1356: DC/DC CONVERTER (CONTROL SYSTEM) DIAG OUTPUT LINE<CVT><CVT>
Code No. B1356: DC/DC Converter (Control System) Diag Output Line <CVT>
OPERATION
- At the auto start, the engine-ECU connector terminal DCCP sends increasing voltage request signal to the DC/DC converter (control system) connector terminal DCCP.
- If the increasing voltage control system is abnormal, the DC/DC converter (control system) connector terminal DCDP sends a diagnostic signal to the engine-ECU connector terminal DCDP.
FUNCTION
- The engine-ECU checks the DC/DC converter's (control system) diagnostic signal circuit whether it is normal.
TROUBLE JUDGEMENT
Check Condition
- For 10 seconds after the ignition is switched "OFF".
Judgement Criterion
- The high signal (ON signal) is received in a row.
FAIL-SAFE AND BACKUP FUNCTION
- In the normal operation, the auto stop is prohibited.
PROBABLE CAUSES
- Short circuit in DC/DC converter (control system) circuit or loose connector contact
- Failed DC/DC converter (control system)
- Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. Perform voltage measurement at DC/DC converter (control system) connector.
- Disconnect connector, and measure at harness side.
- Ignition switch: ON
- Voltage between terminal DCDP and body earth.
OK: System voltage
Is the check result normal?
Go to Step 2.
Repair the connector(s), or check and repair of short to earth in DCDP line between DC/DC converter (control system) connector and engine-ECU connector.
STEP 2. M.U.T.-IIISE data list
- Ignition switch: ON
- Disconnect DC/DC converter (control system) connector.
- Item 191: DC-DC OUT for powertrain (Input)
OK: OFF
Is the check result normal?
Go to Step 4. Go to Step 3.
STEP 3. M.U.T.-IIISE diagnosis code
STEP 4. M.U.T.-IIISE diagnosis code
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