Dtc P1602 Deterioration Of Battery

Engine. Lexus Is250, Is220D. Gse20 Ale20
2Ad-Fhv Engine Control System. Lexus Is250, Is220D. Gse20 Ale20

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 Condition
Trouble Area
P1602
Battery level is 0%
  1. Battery
  2. ECM back-up power source circuit

INSPECTION PROCEDURE

1.INSPECT BATTERY

  1. Inspect battery voltage.

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

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

    3. Turn the engine switch OFF.

    4. 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