(b) Reconnect F53 and F15 connectors.
(c) Jack up the vehicle.
(d) Shift the lever to the neutral position.
(e) Turn the engine switch on (IG).
(f) Check the waveform of the ECU connector using an oscilloscope while turning the wheel slowly.
Result:
Tool Setting
OK:
The waveform is displayed as shown in the illustration.
Text in Illustration
HINT
When the system is functioning normally, one wheel revolution generates 4 pulses. As the vehicle speed increases, the width
indicated by (A) in the illustration narrows.
NG -- GO TO METER / GAUGE SYSTEM
OK -- REPLACE TIRE PRESSURE WARNING ECU
Up to 08/2009
TIRE PRESSURE MONITORING: TIRE PRESSURE WARNING SYSTEM: C2194/94: Engine Speed Signal Error (Test Mode DTC)
C2194/94 - Engine Speed Signal Error (Test Mode DTC)
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 output only in test mode.
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