On-Board Diagnostic System Function (Tire Pressure Monitoring System); Malfunction Detection Function; Malfunction Indication Function; Memory Function - Mazda RX-8 2009 Service Highlights

ON-BOARD DIAGNOSTIC SYSTEM FUNCTION (TIRE PRESSURE MONITORING SYSTEM)

Malfunction Detection Function

! The malfunction detection function detects malfunctions in the input/output signal system based on abnormal
signals from the wheel units when the ignition switch is in the ON position or driving the vehicle.
! The TPMS warning light illuminates for approx. 3.0 s when the ignition switch is turned to the ON position to
inspect for open circuits in the light.

Malfunction Indication Function

! When the malfunction detection function detects a malfunction, the TPMS warning light illuminates to advise
the driver. Using the external tester communication function, DTCs can be output to the DLC-2 via the CAN
communication line. At the same time, malfunction detection results are sent to the memory functions.

Memory Function

! The memory function stores DTCs for malfunctions in input/output signal systems. With this function, once a
DTC is stored it is not cleared after the ignition switch has been turned off (LOCK position), even if the
malfunctioning signal system has returned to normal.
! Since instrument cluster has a built-in non-volatile memory, DTCs are not cleared even if the battery is
removed. Therefore, it is necessary to clear the memory after performing repairs. Refer to the Workshop
Manual for the DTC clearing procedure.

DTC Table

Malfunction location
Instrument cluster
Non-volatile memory failure
System configuration malfunction
Wheel unit 1 internal fault
Wheel unit 2 internal fault
Wheel unit 3 internal fault
Wheel unit 4 internal fault
CAN system communication error
(HS-CAN)
Communication error to PCM
Lost communication with keyless
receiver
Abnormal massage from PCM
ON-BOARD DIAGNOSTIC
TPMS warning light
DTC
illumination condition
B1342 Illuminated
B2143 Illuminated
B2477 Illuminated
B2868 Illuminated
B2869 Illuminated
B2870 Illuminated
B2871 Illuminated
U0073
U0100
Illuminated
U0127
U2023
id020200100200
TPMS warning light
illumination pattern
0.2 s
ON
OFF
1 s
0.2 s
ON
OFF
1 s
0.5 s
ON
OFF
0.5 s
2 s
ON
OFF
2 s
0.2 s
ON
OFF
1 s
02-02–3
02-02