Diagnostic trouble code C1202 Land Cruiser

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK BRAKE FLUID LEVEL

INSPECT BRAKE FLUID LEVEL WARNING SWITCH

CHECK HARNESS AND CONNECTOR (BRAKE FLUID LEVEL WARNING SWITCH - SKID CONTROL ECU)

RECONFIRM DTC

DTC C1202/58 Brake Fluid Level Low / Open Circuit in Brake Fluid Level Warning Switch Circuit

Description

The brake fluid level warning switch sends the appropriate signal to the skid control ECU when the brake fluid level drops.

DTC Code	DTC Detection Condition	Trouble Area
C1202/58	When either of the following conditions is detected: The fluid level of the reservoir is LOW for 4 seconds, or 40 seconds after the ignition switch is turned to ON, or for 7 seconds during pump motor operation. With the ECU terminal IG1 voltage at 9.5 V to 17.0 V, an open in the brake fluid level warning switch circuit continues for 2 seconds or more.	Brake fluid level Brake fluid level warning switch Harness or connector Master cylinder solenoid (Skid control ECU)

Wiring diagram

Inspection procedure

NOTICE:

When replacing the master cylinder solenoid, perform zero point calibration .

HINT:

When C1241/41 is output together with C1202/58, inspect and repair the trouble areas indicated by C1241/41 first.

1.CHECK BRAKE FLUID LEVEL

1. Turn the ignition switch off.

2. Depress the brake pedal 20 times or more (until the pedal reaction feels light and pedal stroke becomes longer).

3. Check the amount of fluid in the brake reservoir.

   HINT:

   When the ignition switch is turned to ON, brake fluid is sent to the accumulator and the fluid level decreases by approximately 10 mm (0.394 in.) from the level when the ignition switch is off (normal).

   OK:

   Brake fluid level is normal.

NG	CHECK AND REPAIR BRAKE FLUID LEAKAGE

OK

2.INSPECT BRAKE FLUID LEVEL WARNING SWITCH

1. Disconnect the A26 brake fluid level warning switch connector.

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

   HINT:

   1. A float is placed inside the reservoir. Its position can be changed by increasing/decreasing the level of brake fluid.
   2. The warning switch is switched on/off at +/-5 mm (+/-0.197 in.) from the MIN level.

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   1 - 2	Float UP (Switch off)	1.9 to 2.1 k?
   1 - 2	Float DOWN (Switch on)	Below 1 ?

   HINT:

   If there is no problem after finishing the above check, adjust the brake fluid level to the MAX level.

   Result

   Result		Proceed to
   OK		A
   NG	LHD	B
   	RHD	C

B	REPLACE BRAKE MASTER CYLINDER RESERVOIR SUB-ASSEMBLY
C	REPLACE BRAKE MASTER CYLINDER RESERVOIR SUB-ASSEMBLY

A

3.CHECK HARNESS AND CONNECTOR (BRAKE FLUID LEVEL WARNING SWITCH - SKID CONTROL ECU)

1. Disconnect the A24 skid control ECU connector and A26 brake fluid level warning switch connector.

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

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   A24-41 (LBL) - A26-2 (LBL)	Always	Below 1 ?
   A24-41 (LBL) - Body ground	Always	10 k? or higher
   A26-1 (GND) - Body ground	Always	Below 1 ?

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.RECONFIRM DTC

1. Clear the DTC .

2. Drive the vehicle at a speed of approximately 32 km/h (20 mph) or more for 60 seconds or more.

3. Check if the same DTC is output .

   HINT:

   Reinstall the sensors, connectors, etc. and restore the previous vehicle conditions before rechecking for DTCs.

   Result

   Result		Proceed to
   DTC is not output		A
   DTC is output	LHD	B
   	RHD	C

B	REPLACE MASTER CYLINDER SOLENOID
C	REPLACE MASTER CYLINDER SOLENOID

A
USE SIMULATION METHOD TO CHECK