Toyota Camry Manual page 977

DTC 41 IG Power Source Circuit
CIRCUIT DESCRIPTION
This is the power source for the ECU, hence the CPU and the actuators.
Diagnostic Trouble Code Detecting Condition
DTC No.
Vehicle speed is 3 km/h (1.9 mph) or more and
voltage of ECU terminal IG1 remains at more
than 17 V or below 9.5 V for more than 10 sec.
Fail safe function: If trouble occurs in the power source circuit, the ECU cuts oft current to the ABS
control (solenoid) relay and prohibits ABS control.
DIAGNOSTIC CHART
Check battery positive voltage.
Check voltage between terminals IG1 and GND
of ABS ECU connector.
Check continuity between terminals GND of ABS
ECU connector and body ground.
Check ECU–IG fuse.
Check for open in harness and connector between
ABS ECU and battery.
BRAKE SYSTEM – ANTI–LOCK BRAKE SYSTEM (ABS)
Trouble area
Battery.
IC regulator.
Open or short in power source circuit.
ECU.
Check and repair the charging system.
Check and replace ABS ECU.
Repair or replace harness or connector.
Check for short in all the harness and
components connected to ECU–IG fuse
(See attached wiring diagram).
BR–291