Toyota Sienna Service Manual: Low Battery Positive Voltage

Toyota Sienna Service Manual / Brake control / Anti-lock brake system / Diagnostic trouble code chart / Low Battery Positive Voltage

DTC C1241/41 Low Battery Positive Voltage

DESCRIPTION

If there is a problem with the brake actuator assembly (skid control ECU) power supply circuit, the skid control ECU outputs the DTC and prohibits the ABS operation with the fail safe function.

If the voltage supplied to the IG1 terminal is not within the DTC detection threshold due to malfunctions in such as the battery and alternator circuit, this DTC is stored.

Low Battery Positive Voltage

WIRING DIAGRAM

WIRING DIAGRAM

INSPECTION PROCEDURE

HINT: After steps 1 and 2 are completed, start the inspection from step 3 when using the intelligent tester, and from step 4 when not using the intelligent tester.

1 INSPECT BATTERY

(a) Check the battery voltage.

Standard voltage: 11 to 14 V

2 INSPECT FUSE (ECU-IG FUSE)

INSPECT FUSE (ECU-IG FUSE)

(a) Remove the ECU-IG fuse from the driver side J/B.

(b) Measure the resistance according to the value(s) in the table below.

Standard resistance

3 READ VALUE OF INTELLIGENT TESTER (IG1 POWER SUPPLY)

(a) Install the ECU-IG fuse.

(b) Connect the intelligent tester to the DLC3.

(d) Start the engine.

(e) Select the DATA LIST mode on the intelligent tester.

ABS:

(f) Measure the voltage output from the ECU displayed on the intelligent tester.

OK: "Normal" is displayed.

4 INSPECT SKID CONTROL ECU (IG1 TERMINAL VOLTAGE)

INSPECT SKID CONTROL ECU (IG1 TERMINAL VOLTAGE)

(a) Disconnect the skid control ECU connector.

(b) Turn the ignition switch to ON position.

Standard voltage

5 INSPECT SKID CONTROL ECU (GND TERMINAL CONTINUITY)

INSPECT SKID CONTROL ECU (GND TERMINAL CONTINUITY)

(a) Turn the ignition switch off.

(b) Measure the resistance according to the value(s) in the table below.

Standard resistance

6 RECONFIRM DTC

(a) Clear the DTCs (See page BC-10).

(b) Check that the same DTC is recorded (See page BC- 10).

HINT: Reinstall the sensors, connectors, etc. and restore the vehicle to its prior condition before rechecking for DTCs.

Result

REPLACE BRAKE ACTUATOR ASSEMBLY

Open in ABS Solenoid Relay Circuit

DESCRIPTION This relay supplies power to each ABS solenoid. Immediately after the ignition switch is turned to the ON position, the relay turns on if the solenoid is determined to be normal ...

Open in Stop Light Switch Circuit

DTC C1249/49 Open in Stop Light Switch Circuit DESCRIPTION This skid control ECU inputs the stop light switch signal and detects the status of brake operation. The skid control ECU has an open ...

Other materials:

Reassembly
1. INSTALL FRONT DRIVE SHAFT BEARING (a) Using SST and a press, install a new front drive shaft bearing. SST 09710-30021 (09710-03141), 09527-10011 NOTICE: Bearing should be completely installed. 2. INSTALL FRONT DRIVE SHAFT RH HOLE SNAP RING (a) Using a snap ring expander, install a ...

Vehicle Speed Signal Circuit between Stereo Component Amplifier and Combination Meter
DESCRIPTION This circuit is necessary for the ASL (Auto Sound Leveliser) built into the stereo component amplifier. Speed signals are received from the combination meter and used for the ASL. The ASL function automatically adjusts the sound data in order to enable hearing the clear audio ...

Precaution
CAUTION: The vehicle is equipped with a Supplemental Restraint System (SRS). It consists of a driver airbag, front passenger airbag, front seat side airbag, curtain shield airbag, and front seat belt pretensioner. Failure to carry out service operations in the correct sequence co ...