(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
From 08/2009
TIRE PRESSURE MONITORING: TIRE PRESSURE WARNING SYSTEM: C2191/91: Vehicle Speed Signal Error (Test Mode DTC)
C2191/91 - Vehicle Speed Signal Error (Test Mode DTC)
DESCRIPTION
The tire pressure warning ECU receives a vehicle speed signal from the combination meter. This DTC is stored upon entering 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 test mode.
HINT
The meter CPU receives vehicle speed signals from this circuit. The vehicle speed sensor detects the voltage that varies according
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