DESCRIPTION
The tire pressure warning ECU receives an engine speed signal from the ECM. This DTC is stored upon entering test mode and cleared when an engine speed signal of 1000 rpm is detected for 3 seconds or more. This DTC is stored only in test mode.
DTC Code |
Detection Condition |
Trouble Area |
---|---|---|
C2194/94 |
The test mode procedure is performed. |
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
PROCEDURE
1. |
READ VALUE USING TECHSTREAM (ENGINE 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 |
---|---|---|---|
Engine Speed |
Engine speed/ min.: 0 rpm max.: 65535 rpm |
Almost same as actual engine speed |
The speed indicated on the combination meter. |
OK:
Engine 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 (TACH SIGNAL) |
(a) Disconnect the F7 ECU connector.
(b) Start the engine.
(c) Check the waveform of the ECU connector using an oscilloscope while idling the engine. OK:
HINT: The wavelength becomes shorter as the engine speed increases. Text in Illustration
|
|
OK |
REPLACE TIRE PRESSURE WARNING ECU |
|
3. |
CHECK HARNESS AND CONNECTOR (TIRE PRESSURE WARNING ECU - ECM) |
(a) Disconnect the F7 ECU connector.
(b) Disconnect the F50 ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
F7-4 (TACH) - F50-29 (TACH) |
Always |
Below 1 Ω |
F7-4 (TACH) - Body ground |
Always |
10 kΩ or higher |
OK |
REPLACE ECM |
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
Detachable pole antenna
The antenna can be removed.
Removing the antenna
Place the included wrench around the antenna.
When not in use, the wrench is stored in glove box.
Loosen the antenna with the wrench and remove it.
Installing the antenna
Tighten the antenna by one h ...
Terminals Of Ecu
TERMINALS OF ECU
1. CHECK NO. 1 AIR CONDITIONING AMPLIFIER ASSEMBLY
(a) Disconnect the F42 No. 1 air conditioning amplifier assembly connector.
(b) Measure the voltage and resistance according to the value(s) in the table
below.
Terminal No. ...