Diagnostic trouble code P1602 4GR-FSE Engine

Description

Inspection procedure

INSPECT BATTERY

DTC P1602 Deterioration of Battery

Description

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

DTC No. DTC Detection Condition Trouble Area
P1602 Battery power is 0 %
  1. Battery
  2. ECM back-up power source circuit

Inspection procedure

 

1.INSPECT BATTERY
  1. INSPECT BATTERY SPECIFIC GRAVITY
    1. Check the specific gravity of each cell.

      Standard:

      1.25 to 1.29 at 20°C (68°F)

  2. 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 headlights, blower fan and defogger for 1 minute.
    3. Turn the engine switch off.
    4. Measure the battery voltage.

      Standard:

      12.5 to 12.9 V at 20°C (68°F)

  NG  
REPLACE BATTERY
 
OK  
   
CHECK ECU POWER SOURCE CIRCUIT