54Da-DTC U116A CHG-CAN Bus-off

DTC U116A: CHG-CAN Bus-off
DTC U116B: Quick Charger CHG-CAN timeout

caution

If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnostics Table ).
Whenever ECU is replaced, ensure that the CAN bus lines are normal.

DTC SET CONDITIONS

The PHEV-ECU set the DTC U116A or U116B when any of the malfunctions occurs in the local CAN for quick charging (Chg-CAN).

PROBABLE CAUSES

DIAGNOSIS

Required Special Tools

STEP 1. Check the signal line for open circuit, short to ground circuit and short to power supply circuit (Quick charger and PHEV-ECU).

Check the wiring harness quick charger connector (terminals No.9, 8) and PHEV-ECU connector (terminals CNEL, CNEH).

Is the check result normal?

Go to Step 2

Repair the connector or wiring harness.

STEP 2. Resistance measurement at the PHEV-ECU connector.

(1)

caution

Always use a digital multimeter to check a resistance as an accurate value must be measured.

Remove the PHEV-ECU connector, and measure at the component side.

(2)

caution

Strictly observe the specified wiring harness repair procedure.

Resistance between the PHEV-ECU connector (terminal CNEH, CNEL) and body ground.

OK: 120 ± 20 Ω

Is the check result normal?

Go to Step 3

Replace the PHEV-ECU (Refer to

STEP 3. Quick charging connector check.

Is the check result normal?

Check the quick charger.

Repair the connector.