ECU Communication Error (Service Code 39) (DTC U0001)
ECU Communication Line Inspection
When the data is not sent from the ECU to the meter unit
for more than about 5 seconds, the service code 39 is
The data is sent through the CAN communication line.
The service code 39 is detected with the meter unit.
When the user mode, this communication error go on or
blink the following items.
Yellow Engine Warning Indicator Light (LED) [A]
Yellow Warning Indicator Light (LED) [B]
KEBC Indicator [C]
KQS Indicator [D]
White Rain Mode Indicator Light (LED) [E]
Remove the ECU, and inspect the CAN communication
Connect a digital meter [A] to the ECU connector [B].
Measure the resistance of the CAN communication line
CAN Communication Line Resistance (at ECU Connector)
Connections: Terminal 60 ←→Terminal 61
123 125 Ω
If the reading is out of the standard, replace the ECU.
If the reading is within the standard, resistor of the ECU
for CAN communication line is normal. Check the wiring
according following procedure.
Remove the ECU and meter unit, and check the wiring for
continuity between main harness connectors.
Disconnect the ECU and meter unit connectors.
Wiring Continuity Inspection
ECU Connector [A] ←→ Meter Unit Connector [B]
ECU Terminal 60 [C] ←→ Meter Unit Terminal [D]
ECU Terminal 61 [E] ←→ Meter Unit Terminal [F]
If the wiring is good, check the meter unit (see Meter Unit
Inspection in the Electrical System chapter).
If the meter unit is normal, replace the ECU (see ECU
Removal/Installation in the Fuel System (DFI) chapter).
SELF-DIAGNOSIS SYSTEM 17-73