[ Model - ECLIPSE CROSS / Year - 2018 ]
2018 / ECLIPSE CROSS / EC - Workshop Manual
13 -FUEL > 13A-DIRECT INJECTION AND MULTIPOINT FUEL INJECTION (DI AND MPI) > TROUBLESHOOTING > DIAGNOSIS CODE PROCEDURES > CODE NO. P0620 ALTERNATOR CONTROL CIRCUIT
Code No. P0620: Alternator Control Circuit
 
 
 
 
OPERATION
  • The engine ECU transmits request signals for the start and stop of power generation, and power generation voltage etc. to the alternator by LIN communication. The alternator transmits information on the power generation state etc. to the engine ECU by LIN communication.
 
 
FUNCTION
  • The engine-ECU compares the battery voltage with the voltage generated from the alternator to check whether the electrical generation is normal.
 
 
TROUBLE JUDGEMENT
Check Conditions
  • Ignition switch is "ON" position.
  • The engine speed is 600 r/min or more.
  • The battery backup voltage is 13.5 V or more.
Judgement Criterion
  • For 30 seconds, the final target generation voltage subtracted from the battery backup voltage equals 0.8 V or more.
or
  • For 30 seconds, the battery backup voltage subtracted from the final target generation voltage equals 1.3 V or more.
 
 
FAIL-SAFE AND BACKUP FUNCTION
  • Prohibits alternator output suppression control against current consumers. (operates as a normal alternator.)
  • In the normal operation, the auto stop is prohibited.
 
 
PROBABLE CAUSES
  • Failed battery
  • Failed drive belt
  • Loose connector contact
  • Open/short circuit or harness damage in alternator circuit
  • Harness damage in battery backup circuit
  • Failed alternator
  • Failed engine-ECU
 
 
 
DIAGNOSIS PROCEDURE
STEP 1. Checking engine start conditions
  • Check whether the user uses the booster cable to start the engine.
noteThis diagnosis code can be output due to the battery voltage drop.
Have you ever used the booster cable to start the engine?
Delete the diagnosis code and check end.
Go to Step 2.
 
STEP 2. Battery check
  • Check the battery (Refer to GROUP 54A - Battery - On-vehicle Service - Battery Test ).
Is the check result normal?
Go to Step 3.
Replace the battery.
 
STEP 3. Drive belt tension check
  • Drive belt tension check (Refer to GROUP 11A - On-vehicle Service - Drive Belt Tension Check and adjustment )
Is the check result normal?
Go to Step 4.
Replace the drive belt.
 
STEP 4. Check of open circuit, short circuit, and damage in LNBS line between alternator connector and engine-ECU connector.
Is the check result normal?
Go to Step 5.
Repair the connector(s) or wiring harness.
 
STEP 5. Check of open circuit, short circuit, and damage in BACK line between battery and engine-ECU connector.
Is the check result normal?
Go to Step 6.
Repair the connector(s) or wiring harness.
 
STEP 6. M.U.T.-IIISE diagnosis code
  • Reconfirmation of diagnosis code.
Is the diagnosis code set?
Go to Step 7.
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).
 
STEP 7. Replace the drive belt
  • After replacing the drive belt, reconfirm whether the diagnosis code is set.
Is the diagnosis code set?
Go to Step 8.
Check end.
 
STEP 8. Replace the alternator
  • After replacing the alternator, reconfirm whether the diagnosis code is set.
Is the diagnosis code set?
Replace the engine-ECU.
Check end.