[ Model - ECLIPSE CROSS / Year - 2018 ]
2018 / ECLIPSE CROSS / EC - Workshop Manual
54 -CHASSIS ELECTRICAL > 54A-CHASSIS ELECTRICAL > ETACS > INPUT SIGNAL PROCEDURES > THE IGNITION SWITCH (IG1) SIGNAL IS NOT SENT TO THE ETACS-ECU.
Inspection Procedure 2: The ignition switch (IG1) signal is not received.
 
 
caution
  • Before replacing the ECU, ensure that the power supply circuit, the earth circuit and the communication circuit are normal.
 
 
COMMENTS ON TROUBLE SYMPTOM
If there is an error to the input signal (IG1) from the ignition switch <Vehicles without KOS> or KOS&OSS-ECU <Vehicles with KOS>, or if the IG relay in ETACS-ECU does not function normally, the ignition switch (IG1) signal is no longer output to the communication line.
 
 
PROBABLE CAUSES
  • Malfunction of the ETACS-ECU
  • Malfunction of the ignition switch <Vehicles without KOS>
  • Malfunction of the KOS&OSS-ECU <Vehicles with KOS>
  • Damaged harness wires and connectors
 
 
DIAGNOSIS PROCEDURE
STEP 1. Voltage measurement at ETACS-ECU connector (IGS terminal)
(1) Disconnect the connector, and measure at the wiring harness side.
(2) Turn the ignition switch to the "ON" position.
(3) Check the voltage between the ETACS-ECU connector (IG1, IGS terminal) and body earth.
OK: System voltage
Is the check result normal?
Go to Step 5.
NO <vehicles with KOS> : Go to Step 2.
NO <vehicles without KOS> : Go to Step 3.
 
STEP 2. Check the M.U.T.-IIISE Diagnosis code for other systems
Check that the KOS&OSS-ECU set a diagnosis code.
Is the diagnosis code set?
Diagnose the KOS&OSS-ECU. Refer to GROUP 42B, Troubleshooting .
Go to Step 4.
 
STEP 3. Ignition switch check
Check the ignition switch. Refer to .
Is the check result normal?
Go to Step 4.
Troubleshoot the ignition switch. Refer to Inspection Procedure 2 "Malfunction of the ignition switch power supply system" .
 
STEP 4. Check of short to power supply, short to earth, and open circuit in IG1, IGS line between ignition switch (IG1) <Vehicles without KOS> or KOS&OSS-ECU (IG1) <Vehicles with KOS> and ETACS-ECU connector.
Is the check result normal?
Go to Step 5.
Repair the connector(s) or wiring harness.
 
STEP 5. M.U.T.-IIISE data list
Check the input signal from the ignition switch (IG1).
  • Turn the ignition switch to the "ON" position.
 
Item No.Item nameNormal condition
79IG voltageSystem voltage
OK: Normal condition is displayed.
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.