DESCRIPTION
The tire pressure warning ECU receives a vehicle speed signal from the combination meter. This DTC is stored upon entering signal check mode (test mode), and cleared when a vehicle speed signal of 20 km/h (12 mph) is detected for 3 seconds or more. This DTC is output only in signal check mode.
DTC No. |
DTC Detection Condition |
Trouble Area |
---|---|---|
C2191/91 |
Test mode procedure is performed |
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
PROCEDURE
1. |
READ VALUE USING TECHSTREAM (VEHICLE SPEED) |
(a) Turn the ignition switch off.
(b) Connect the Techstream to the DLC3.
(c) Turn the ignition switch to ON.
(d) Turn the Techstream on.
(e) Enter the following menus: Chassis / Tire Pressure Monitor / Data List.
(f) Check that the values indicated on the Techstream and on the combination meter are the same.
Tire Pressure Monitor
Tester Display |
Measurement Item/Range |
Normal Condition |
Diagnostic Note |
---|---|---|---|
Vehicle Speed |
Vehicle speed/ min.: 0 km/h (0 mph) max.: 255 km/h (158 mph) |
Almost same as actual vehicle speed |
Speed indicated on combination meter |
OK:
Vehicle speed indicated on the Techstream and on the combination meter are the same.
OK | ![]() |
USE SIMULATION METHOD TO CHECK |
|
2. |
INSPECT TIRE PRESSURE WARNING ECU (SPD SIGNAL) |
(a) Disconnect the D31 ECU connector. |
|
(b) Jack up the vehicle.
(c) Move the shift lever to N.
(d) Turn the ignition switch to ON.
(e) Check the waveform of the ECU connector using an oscilloscope while turning the wheel slowly.
OK:
Tester Connection |
Switch Condition |
Specified Condition |
---|---|---|
D31-2 (SPD) - D31-9 (GND) |
Ignition switch ON |
Correct waveform appears as shown |
*1 |
Rear view of wire harness connector (to Tire Pressure Warning ECU) |
Item |
Contents |
---|---|
Tool Setting |
5 V/DIV., 20 ms/DIV. |
Vehicle Condition |
Driving wheels rotating slowly |
HINT:
The wavelength becomes shorter as the vehicle speed increases.
OK | ![]() |
REPLACE TIRE PRESSURE WARNING ECU |
|
3. |
CHECK HARNESS AND CONNECTOR (ECU - COMBINATION METER) |
(a) Disconnect the D31 ECU connector. |
|
(b) Disconnect the E1 meter connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
D31-2 (SPD) - E1-16 (+S) |
Always |
Below 1 Ω |
D31-2 (SPD) - Body ground |
Always |
10 kΩ or higher |
*1 |
Front view of wire harness connector (to Tire Pressure Warning ECU) |
*2 |
Front view of wire harness connector (to Combination Meter) |
OK | ![]() |
REPLACE COMBINATION METER |
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
Installation
INSTALLATION
PROCEDURE
1. INSTALL FRONT NO. 1 STABILIZER BAR BUSHING
(a) Install the 2 front No. 1 stabilizer bar bushings to the front stabilizer
bar as shown in the illustration.
Text in Illustration
*1
...
Initialization has not been Performed (B2450)
DESCRIPTION
The headlight leveling ECU assembly stores this DTC if initialization has not
been performed after the ECU was replaced.
DTC No.
DTC Detecting Condition
Trouble Area
B2450
Initializat ...
Data List / Active Test
DATA LIST / ACTIVE TEST
1. DATA LIST
HINT:
Using the Techstream to read the Data List allows the values or states of switches,
sensors, actuators and other items to be read without removing any parts. This non-intrusive
inspection can be very useful bec ...