Mazda X-5. Manual - part 45

ON-BOARD DIAGNOSTIC 

02–02–1

02–02

02–02

ON-BOARD DIAGNOSTIC

ON-BOARD DIAGNOSTIC SYSTEM

OUTLINE (TIRE PRESSURE
MONITORING SYSTEM) . . . . . . . . . . . .  02–02–2

Block Diagram  . . . . . . . . . . . . . . . . . . .  02–02–2

ON-BOARD DIAGNOSTIC SYSTEM

FUNCTION (TIRE PRESSURE
MONITORING SYSTEM) . . . . . . . . . . . .  02–02–3

Malfunction Detection Function . . . . . .  02–02–3
Malfunction Indication Function . . . . . .  02–02–3
Memory Function . . . . . . . . . . . . . . . . .  02–02–3
DTC Table  . . . . . . . . . . . . . . . . . . . . . .  02–02–4

ON-BOARD DIAGNOSTIC SYSTEM

PID/DATA MONITOR FUNCTION
(TIRE PRESSURE MONITORING
SYSTEM) . . . . . . . . . . . . . . . . . . . . . . . .  02–02–5

ON-BOARD DIAGNOSTIC SYSTEM 

ACTIVE COMMAND MODES
FUNCTION (TIRE PRESSURE
MONITORING SYSTEM)  . . . . . . . . . . . . 02–02–6

ON-BOARD DIAGNOSTIC SYSTEM 

FREEZE FRAME DATA MONITOR
FUNCTION (TIRE PRESSURE
MONITORING SYSTEM)  . . . . . . . . . . . . 02–02–6

ON-BOARD DIAGNOSTIC SYSTEM 

EXTERNAL TESTER COMMUNICATION 
FUNCTION (TIRE PRESSURE
MONITORING SYSTEM)  . . . . . . . . . . . . 02–02–6

External Tester Communication 

Function. . . . . . . . . . . . . . . . . . . . . . . . 02–02–6

Serial Communication . . . . . . . . . . . . . . 02–02–7

DLC-2 CONSTRUCTION  . . . . . . . . . . . . . 02–02–7

End of Toc

ON-BOARD DIAGNOSTIC 

02–02–2

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

E5U020237020N01

• The on-board diagnostic system consists of a malfunction detection system that detects abnormalities in input/

output signals when the ignition switch is at the ON position, a data monitor function that reads out specified 
input/output signals, and an active command modes function that execuse the wheel unit ID registration.

• The Data Link Connector 2 (DLC-2), which groups together all the connectors used for malfunction diagnosis 

into a single location, has been adopted, thereby improving serviceability. Diagnosis is performed by 
connecting the WDS or equivalent to the DLC-2.

• In addition to DTC read-out, the WDS or equivalent is used to clear DTCs using the display screen of the 

diagnostic tester, and to access the data monitor, providing enhanced malfunction diagnosis and improved 
serviceability.

Block Diagram
With advanced keyless system or keyless entry system

WDS OR
EQUIVALENT

WHEEL UNITS

MALFUNCTION
INFORMATION

PID/DATA
MONITOR
FUNCTION

EXTERNAL
TESTER
COMMUNICATION
FUNCTION

MEMORY
FUNCTION

DLC-2

CAN
DRIVER

TPMS
WARNING
LIGHT

MALFUNCTION
INDICATION
FUNCTION

TPMS
WARNING
BUZZER

FLAT TIRE
WARNING
LIGHT

FLAT TIRE
WARNING
BUZZER

ON-BOARD DIAGNOSIS FUNCTION

INSTRUMENT CLUSTER

MALFUNCTION
DETERMINATION

MALFUNCTION DETECTION FUNCTION

KEYLESS 
RECEIVER

KEYLESS 
CM

RF SIGNAL

ACTIVE 
COMMAND 
MODES 
FUNCTION

E5U202ZS5001

ON-BOARD DIAGNOSTIC 

02–02–3

02–02

Without advanced keyless system and keyless entry system

End Of Sie

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

E5U020237020N02

Malfunction Detection Function

• The malfunction detection function detects malfunctions in the input/output signal system of the tire pressure 

monitoring system (TPMS) control module 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.

WDS OR
EQUIVALENT

WHEEL UNITS

MALFUNCTION
INFORMATION

PID/DATA
MONITOR
FUNCTION

EXTERNAL
TESTER
COMMUNICATION
FUNCTION

MEMORY
FUNCTION

DLC-2

CAN
DRIVER

TPMS
WARNING
LIGHT

MALFUNCTION
INDICATION
FUNCTION

TPMS
WARNING
BUZZER

FLAT TIRE
WARNING
LIGHT

FLAT TIRE
WARNING
BUZZER

ON-BOARD DIAGNOSIS FUNCTION

INSTRUMENT CLUSTER

MALFUNCTION
DETERMINATION

MALFUNCTION DETECTION FUNCTION

KEYLESS 
RECEIVER

RF SIGNAL

ACTIVE 
COMMAND 
MODES 
FUNCTION

E5U202ZS5003

ON-BOARD DIAGNOSTIC 

02–02–4

DTC Table

End Of Sie

Malfunction location

DTC

(WDS or equivalent)

TPMS warning light

illumination condition

TPMS warning light
illumination pattern

Instrument cluster

B1342

Illuminated

System configuration malfunction

B2477

Illuminated

Wheel unit 1 internal fault

B2868

Illuminated

Wheel unit 2 internal fault

B2869

Illuminated

Wheel unit 3 internal fault

B2870

Illuminated

Wheel unit 4 internal fault

B2871

Illuminated

Non-volatile memory failure

B2143

Illuminated

Wheel unit 1 communication 
malfunction

U2616

Illuminated

Wheel unit 2 communication 
malfunction

U2617

Illuminated

Wheel unit 3 communication 
malfunction

U2618

Illuminated

Wheel unit 4 communication 
malfunction

U2619

Illuminated

Lost communication with keyless 
receiver

U0127

Illuminated

ON

OFF

1 s

0.2 s

ON

OFF

0.5 s

0.5 s

ON

OFF

2 s

2 s

ON

OFF

1 s

0.2 s

ON

OFF

1 s

1 s

ON

OFF

1 s

0.2 s