Dtc P1602 Deterioration Of Battery

Lexus IS250 IS220d GSE20 ALE20 2AD-FHV ENGINE CONTROL SYSTEM

DESCRIPTION

INSPECTION PROCEDURE

INSPECT BATTERY

DTC P1602 Deterioration of Battery

DESCRIPTION

The ECM determines the battery level according to the voltage of the BATT terminal while the engine is running (not cranking).

DTC No.DTC Detection ConditionTrouble Area
P1602 Battery level is 0%
Battery
ECM back-up power source circuit

INSPECTION PROCEDURE

1.INSPECT BATTERY

Inspect battery voltage.


After the vehicle is driven for 20 minutes, stop the engine.

Turn the engine switch ON (IG), and turn on the headlight, blower fan, and defogger for 1 minute.

Turn the engine switch OFF.

Measure the battery voltage.

  • Standard voltage:
  • 12.5 to 12.9 V at 20°C (68°F)
NG
REPLACE BATTERY
OK
CHECK ECM BACK-UP POWER SOURCE CIRCUIT