DTC    P1602    Deterioration of Battery

for Preparation Click here


DESCRIPTION

The ECU determines the battery power according to the voltage of the AM21 terminal while the engine is running (not cranking).

DTC No.
DTC Detection Condition
Trouble Area
P1602
Battery voltage is low for 10 seconds or more when the engine is running (not cranking)
(1 trip detection logic)
  1. Charging system
  2. Power management control ECU battery power source circuit

WIRING DIAGRAM


B213268E01


INSPECTION PROCEDURE

NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.

1.CHECK CHARGING SYSTEM

  1. Check the charging system (Click here).



NG
REPAIR OR REPLACE CHARGING SYSTEM
OK


2.CHECK HARNESS AND CONNECTOR (BATTERY - POWER MANAGEMENT CONTROL ECU)
B211642E01

  1. Disconnect the power management control ECU connector.

  1. Measure the voltage according to the value(s) in the table below.

  1. w/o Entry and Start System

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    D39-8 (AM21) - Body ground
    		Always
    		11 to 14 V

  1. w/ Entry and Start System

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    D38-2 (AM21) - Body ground
    		Always
    		11 to 14 V
    D38-1 (AM22) - Body ground

    Text in Illustration 
    *1
    		Rear view of wire harness connector:
    (to Power Management Control ECU)
    *2
    		w/o Entry and Start System
    *3
    		w/ Entry and Start System



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

USE SIMULATION METHOD TO CHECK (Click here)