Diagnostic trouble code C1248 Land Cruiser

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT REAR DIFFERENTIAL LOCK POSITION SWITCH (NO. 1 TRANSFER INDICATOR SWITCH)

CHECK HARNESS AND CONNECTOR (DIFFERENTIAL LOCK SWITCH - SKID CONTROL ECU AND BODY GROUND)

CHECK DTC

DTC C1248/48 Open Circuit in Rear Differential Lock

Description

DTC No.	DTC Detection Condition	Trouble Area
C1248/48	With the vehicle speed at 50 km/h (30 mph) or more, the rear differential lock position switch changes from off to on and 3 seconds or more elapse.	Rear differential lock position switch (No. 1 transfer indicator switch) Master cylinder solenoid (Skid control ECU) Harness or connector

Wiring diagram

Inspection procedure

1.INSPECT REAR DIFFERENTIAL LOCK POSITION SWITCH (NO. 1 TRANSFER INDICATOR SWITCH)

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

   

   Standard Resistance:

   Tester Connection	Switch Condition	Specified Condition
   2 (+B) - 1 (GND)	Pushed	Below 1 ?
   	Not pushed	10 k? or higher

NG	REPLACE NO. 1 TRANSFER INDICATOR SWITCH

OK

2.CHECK HARNESS AND CONNECTOR (DIFFERENTIAL LOCK SWITCH - SKID CONTROL ECU AND BODY GROUND)

1. Disconnect the A24 skid control ECU connector.

2. Disconnect the f2 differential lock switch connector.

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

   Standard Resistance:

   Tester Connection	Condition	Tester Connection
   f2-2 (+B) - A24-26 (EXI3)	Always	Below 1 ?
   f2-2 (+B) - Body ground	Always	10 k? or higher
   f2-1 (GND) - Body ground	Always	Below 1 ?

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3.CHECK DTC

1. Clear the DTC .

2. Drive the vehicle at 50 km/h (30 mph) or more.

3. Check if the same DTC is output .

   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