STEP 1. Voltage measurement at the gateway-ECU connector
(1) Disconnect the connector, and measure at the wiring harness side.
(2) Turn the ignition switch to the "LOCK" (OFF) position.
(3) Measure the voltage between the gateway-ECU connector (+B terminal) and the body ground.OK: The voltage should measure approximately 12 volts (battery positive voltage).
Is the check result normal?
Go to Step 3. Go to Step 2.
STEP 2. Check of open circuit in +B line between the fusible link and gateway-ECU connector.
STEP 3. Voltage measurement at the gateway-ECU connector
(1) Disconnect the connector, and measure at the wiring harness side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between the gateway-ECU connector (IG terminal) and the body ground.OK: The voltage should measure approximately 12 volts (battery positive voltage).
Is the check result normal?
Go to Step 6. Go to Step 4.
STEP 4. Using scan tool (M.U.T.-IIISE), check other system data list.
Check the input signal from the ignition switch (IG1) in the ETACS-ECU.- Turn the ignition switch to the "ON" position.
| Item No. | Item name | Normal condition | 79 | IG voltage | Battery positive voltage |
|
Item No. | Item name | Normal condition |
79 | IG voltage | Battery positive voltage |
OK: Normal condition is displayed.
Is the check result normal?
Go to Step 5. : Troubleshoot the ETACS-ECU (Refer to Inspection Procedure 2 "The ignition switch (IG1) signal is not received." ).
STEP 5. Check of open circuit in IG line between the ignition switch (IG1) and gateway-ECU connector.
STEP 6. Resistance measurement at the gateway-ECU connector
(1) Disconnect the connector, and measure at the wiring harness side.
(2) Measure the resistance between the gateway-ECU connector (GND terminal) and the body ground.OK: The resistance should be 2 ohms or less
Is the check result normal?
Go to Step 8. Go to Step 7.
STEP 7. Check of open circuit in GND line between gateway-ECU connector and body ground.
STEP 8. Retest the system