[ Model - ECLIPSE CROSS / Year - 2018 ]
2018 / ECLIPSE CROSS / EC - Workshop Manual
54 -CHASSIS ELECTRICAL > 54A-CHASSIS ELECTRICAL > ETACS > SYMPTOM PROCEDURES > CHECK THE CIRCUIT (POWER SUPPLY LINE) FROM BATTERY
Malfunction of ETACS-ECU power supply circuit
 
 
 
 
COMMENTS ON TROUBLE SYMPTOM
If the ETACS-ECU functions do not work at all, the ETACS-ECU power supply system, earth system, or ETACS-ECU may have a problem.
 
 
PROBABLE CAUSES
  • Damaged harness wires and connectors
  • Malfunction of the ETACS-ECU
 
 
DIAGNOSIS PROCEDURE
STEP 1. Resistance measurement at ETACS-ECU connector (GND, SGND terminal).
(1) Disconnect the connector, and measure at the wiring harness side.
(2) Measure the resistance between the ETACS-ECU connector (GND, SGND terminal) and body earth.
OK: Continuity exists (2 Ω or less)
Is the check result normal?
Go to Step 3.
Go to Step 2.
 
STEP 2. Check of open circuit in GND, SGND line between ETACS-ECU connector and body earth.
Is the check result normal?
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).
Repair the connector(s) or wiring harness.
 
STEP 3. Voltage measurement at ETACS-ECU connector (+B1, +B2 terminal).
(1) Disconnect the connector, and measure at the wiring harness side.
(2) Measure the voltage between the ETACS-ECU connector (+B1, +B2 terminal) and body earth.
OK: System voltage
Is the check result normal?
Go to Step 5.
Go to Step 4.
 
STEP 4. Check of short to power supply, short to earth, and open circuit in +B1, +B2 line between fusible link and ETACS-ECU connector.
Is the check result normal?
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).
Repair the connector(s) or wiring harness.
 
STEP 5. Retest the system
Check that the ETACS-ECU functions work normally.
Is the check result normal?
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).
Replace the ETACS-ECU.