DTC 09:ER20
id0902f6818500
DTC 09:Er20
Power supply circuit of base unit
DETECTION CONDITION
• Voltage detected at base unit terminals 1B and 1R is
less than 8.5 V
,
or more than 16 V (must not be 16V)
.
POSSIBLE CAUSE
• Weak battery
• Malfunction in wiring harness between battery and base unit
Diagnostic procedure
STEP
INSPECTION
ACTION
1
INSPECT THE BATTERY
• Measure the battery voltage.
• Is the voltage
8.5 V -16 V
?
Yes
Go to the next step.
No
Battery is weak.
• Inspect the charge/discharge system.
2
INSPECT THE WIRING HARNESS BETWEEN FUSE BLOCK AND BASE UNIT
• Measure the voltage at base unit connector terminals 1B and 1R.
• Is the voltage
8.5 V -16 V
?
Yes
Go to the next step.
No
Repair the wiring harness between the fuse block and base unit.
3
INSPECT THE BASE UNIT
• Clear the DTC.
• Turn the ignition switch to the ACC or ON position and hold for
30 s or more
.
• Start the on-board diagnostic test mode.
• Is DTC 09:Er20 displayed?
Yes
Replace the base unit.
No
DTC troubleshooting completed.
