Lexus IS250 IS220d GSE20 ALE20 4GR-FSE ENGINE CONTROL SYSTEM
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 % | Battery ECM back-up power source circuit |
INSPECTION PROCEDURE
| 1.INSPECT BATTERY |
INSPECT BATTERY SPECIFIC GRAVITY
Check the specific gravity of each cell.
- Standard:
- 1.25 to 1.29 at 20°C (68°F)
INSPECT BATTERY VOLTAGE
After the vehicle is driven for 20 minutes, stop the engine.
Turn the engine switch on (IG), and turn on the headlights, blower fan and defogger for 1 minute.
Turn the engine switch off.
Measure the battery voltage.
- Standard:
- 12.5 to 12.9 V at 20°C (68°F)
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| OK | ||
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