Last Modified: 4-30-2014 6.6 C Doc ID: RM0000018LI001X
Model Year: 2006 Model: LX470 Prod Date Range: [05/2005 -           ]
Title: TIRE AND WHEEL: TIRE PRESSURE WARNING SYSTEM: C2177/77; Initialization not Completed; 2006 MY LX470 [05/2005 -        ]

DTC

C2177/77

Initialization not Completed

DESCRIPTION

Initialization is necessary after replacing the ECU, tires with tires of different pressures or a tire pressure monitor valve sub-assembly, after rotating the tires or when a new vehicle is delivered.

DTC No.

DTC Detection Condition

Trouble Area

C2177/77

Initialization is not complete after vehicle speed of 5 mph (8 km/h) or more continues for 20 minutes or more (total).
  • Tire pressure monitor valve sub-assembly
  • Tire pressure monitor ECU
  • Wire harness
  • Tire pressure warning reset switch
  • Tire pressure warning select switch
  • Tire pressure warning select switch

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:

It is necessary to register an ID code after replacing the tire pressure monitor valve sub-assembly and/or the tire pressure monitor ECU 2006 MY LX470 [05/2005 -        ]; TIRE AND WHEEL: TIRE PRESSURE WARNING SYSTEM: REGISTRATION .

HINT:

Set the tire pressure to the specified value.

PROCEDURE

1.

CHECK TIRE PRESSURE WARNING LIGHT

(a) Check the tire pressure warning light.

Result

Condition

Proceed to

Does not blink

A

Comes on and goes off repeatedly at 0.5 second intervals

B
B

GO TO STEP 7

A

2.

CLEAR DTC

(a) Clear the DTC 2006 MY LX470 [05/2005 -        ]; TIRE AND WHEEL: TIRE PRESSURE WARNING SYSTEM: DTC CHECK / CLEAR .

NEXT

3.

CHECK DTC

(a) Check for DTC 2006 MY LX470 [05/2005 -        ]; TIRE AND WHEEL: TIRE PRESSURE WARNING SYSTEM: DTC CHECK / CLEAR .

OK:

DTC C2177/77 is not output.

OK

PERFORM INITIALIZATION

NG

4.

CHECK TIRE PRESSURE WARNING LIGHT

(a) Turn the ignition switch ON.

(b) Check that the tire pressure warning light comes on for 3 seconds and goes off.

Result

Condition

Proceed to

Does not come on

A

Comes on

B
B

GO TO STEP 2

A

5.

CHECK WIRE HARNESS (ECU - COMBINATION METER)

(a) Disconnect the T35 ECU connector.

(b) Disconnect the C15 combination meter connector.

(c) Measure the resistance of the wire harness side connectors.

Standard resistance:

Tester Connection

Specified Condition

T35-5 (IND) - C15-13

Below 1 Ω

T35-5 (IND) - Body ground

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS AND CONNECTOR

OK

6.

INSPECT TIRE PRESSURE MONITOR ECU

(a) Connect the T35 ECU connector.

(b) Measure the voltage wire harness connector.

Standard voltage:

Tester Connection

Condition

Specified Condition

Z34-5 (IND) - Z34-9 (GND)

Immediately after turning the ignition switch ON (within 3 seconds)

8 to 16 V
NG

REPLACE TIRE PRESSURE MONITOR ECU

OK

REPLACE COMBINATION METER

7.

CHECK TIRE PRESSURE WARNING LIGHT

(a) Enter TEST MODE 2006 MY LX470 [05/2005 -        ]; TIRE AND WHEEL: TIRE PRESSURE WARNING SYSTEM: TEST MODE PROCEDURE .

(b) Press the tire pressure warning reset switch for 1 second or more after switching to TEST MODE.

(c) Check that the tire pressure warning light comes on while pressing the tire pressure warning reset switch.

Result

Condition

Proceed to

Comes on

A

Does not come on

B
B

GO TO STEP 18

A

8.

CHECK TIRE PRESSURE WARNING LIGHT

(a) Turn the ignition switch ON.

(b) Rapidly reduce the pressure of the tires to approximately 120 kPa (1.2 kgf/cm 2 , 35 psi).

(c) Check that the tire pressure warning light comes on for 1 second while rapidly reducing the pressure or immediately after reducing the pressure.

(d) Note the check results.

(e) Set the tire pressure to the specified value.

(f) Check that the tire pressure warning light comes on when each of the wheels is inspected.

Result

Result

Proceed to

Does not come on (All wheels)

A

Does not come on (Some wheels)

B

Comes on (All wheels)

C

HINT:

Replace the tire pressure monitor valve sub-assembly for which the tire pressure warning light did not come on during inspection.

B

REPLACE TIRE PRESSURE MONITOR VALVE SUB-ASSEMBLY

C

PERFORM INITIALIZATION

A

9.

CHECK TIRE PRESSURE WARNING SELECT SWITCH POSITION

(a) Check that the position of the tire pressure warning select switch (MAIN or 2nd) is the same as the type of registration ID of the wheels being used.
NG

CHANGE TIRE PRESSURE WARNING SELECT SWITCH POSITION

OK

10.

CHECK TEST MODE DTC

(a) Check for test mode DTC 2006 MY LX470 [05/2005 -        ]; TIRE AND WHEEL: TIRE PRESSURE WARNING SYSTEM: TEST MODE PROCEDURE .

Result

Result

Proceed to

C2195/95 output

A

C2195/95 not output

B
B

GO TO STEP 14

A

11.

CHECK WIRE HARNESS (ANTENNA - ECU)

(a) Disconnect the T36 ECU connector.

(b) Disconnect the T40 and T41 antenna connectors.

(c) Measure the resistance of the wire harness side connectors.

Standard resistance:

Tester Connection

Specified Condition

T36-3 (ANTL) - T40-1

Below 1 Ω

T36-2 (ANTR) - T41-1

Below 1 Ω
NG

REPAIR OR REPLACE HARNESS AND CONNECTOR

OK

12.

REPLACE OUTER MIRROR RETRACTOR (TIRE PRESSURE ANTENNA)
NEXT

13.

CHECK DTC

(a) Check for DTC 2006 MY LX470 [05/2005 -        ]; TIRE AND WHEEL: TIRE PRESSURE WARNING SYSTEM: DTC CHECK / CLEAR .

OK:

DTC is not output.

OK

END

NG

REPLACE TIRE PRESSURE MONITOR ECU

14.

CHECK TIRE PRESSURE MONITOR ECU

(a) Disconnect the T35 ECU connector.

(b) Disconnect the T38 switch connector.

(c) Measure the resistance of the wire harness side connector.

Standard resistance:

Tester Connection

Specified Condition

T35-7 (IDSW) - T38-2

Below 1 Ω

T35-7 (IDSW) - Body ground

10 k Ω or higher

T38-1 - Body ground

Below 1 Ω
NG

REPAIR OR REPLACE HARNESS AND CONNECTOR

OK

15.

INSPECT TIRE PRESSURE WARNING SELECT SWITCH

(a) Remove the select switch.

(b) Measure the resistance of the switch.

Standard resistance:

Tester Connection

Switch Position

Specified Condition

1 - 2

MAIN

10 k Ω or higher

1 - 2

2nd

Below 1 Ω
NG

REPLACE TIRE PRESSURE WARNING SELECT SWITCH (END)

OK

16.

REPLACE TIRE PRESSURE MONITOR ECU
NEXT

17.

CHECK DTC

(a) Check for DTC.

OK:

DTC is not output

OK

END

NG

REPLACE TIRE PRESSURE MONITOR VALVE SUB-ASSEMBLY

18.

CHECK WIRE HARNESS (RESET SWITCH - ECU)

(a) Disconnect the T37 switch connector.

(b) Disconnect the T35 ECU connector.

(c) Measure the resistance of the wire harness side connectors.

Standard resistance:

Tester Connection

Specified Condition

T35-8 (CALSW) - T37-3

Below 1 Ω

T35-8 (CALSW) - Body ground

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS AND CONNECTOR

OK

19.

INSPECT TIRE PRESSURE MONITOR ECU

(a) Connect the T35 ECU connector.

(b) Connect the T37 switch connector.

(c) Measure the voltage of the ECU.

Result

Tester Connection

Connection

Specified Condition

T35-8 (CALSW) - T35-9 (GND)

Ignition switch ON

Reset switch ON

Below 1.5 V

T35-8 (CALSW) - T35-9 (GND)

Ignition switch ON

Reset switch OFF

8 to 15 V
NG

REPLACE TIRE PRESSURE WARNING RESET SWITCH

OK

REPLACE TIRE PRESSURE MONITOR ECU