Last Modified: 04-05-2023 6.11:8.1.0 Doc ID: RM100000000VIUA
Model Year Start: 2016 Model: Sienna Prod Date Range: [12/2015 - 08/2016]
Title: TIRE PRESSURE MONITORING: TIRE PRESSURE WARNING SYSTEM: C2178/78; Battery Voltage Malfunction; 2016 MY Sienna [12/2015 - 08/2016]

DTC

C2178/78

Battery Voltage Malfunction

DESCRIPTION

DTC No.

DTC Detection Condition

Trouble Area

C2178/78

With ignition switch ON, when IG voltage of less than 10 V continues for 20 minutes or more, or IG voltage of over 16 V continues for 0.5 seconds or more

  • Battery
  • Charging system
  • Tire pressure warning ECU

CAUTION / NOTICE / HINT

If DTC C2178/78 is output, inspect the battery and charging system (See page 2016 MY Sienna [12/2015 - 08/2016]; 2GR-FE BATTERY / CHARGING: CHARGING SYSTEM: ON-VEHICLE INSPECTION ).

If the battery and charging system are normal, perform the "ECU Power Source Circuit" inspection procedure (See page 2016 - 2020 MY Sienna [12/2015 -        ]; TIRE PRESSURE MONITORING: TIRE PRESSURE WARNING SYSTEM: ECU Power Source Circuit ).

PROCEDURE

1.

INSPECT BATTERY

(a) Check the battery voltage.

Standard voltage:

11 to 14 V

OK

CHECK ECU POWER SOURCE CIRCUIT

NG

CHECK OR REPLACE CHARGING SYSTEM OR BATTERY