TIRE PRESSURE MONITORING SYSTEM (TPMS) ON-BOARD DIAGNOSIS

2008 - MX-5 - Suspension

TIRE PRESSURE MONITORING SYSTEM (TPMS) ON-BOARD DIAGNOSIS

On-Board Diagnostic (OBD) Test Description

The OBD test inspects the integrity and function of the TPMS and outputs the results when requested by the specific tests.

On-board diagnostic test also:

Provides a quick inspection of the TPMS usually performed at the start of each diagnostic procedure.

Provides verification after repairs to ensure that no other faults occurred during service.

The OBD test is divided into 3 tests:

Read/clear diagnostic results, PID monitor and active command mode.

Read/clear diagnostic results

This function allows you to read or clear DTCs in the TPMS control module memory.

PID/Data monitor and record

This function allows you to access certain data values, input signals, calculated values, and system status information.

Active command modes

This function allows you to control devices through the M-MDS.

Reading DTCs Procedure

1. Connect the M-MDS to the DLC-2.

2. After the vehicle is identified, select the following items from the initialization screen of the M-MDS.

When using the IDS (laptop PC)

Select “Self Test”.

Select “Modules”.

Select “IC”.

When using the PDS (Pocket PC)

Select “Module Tests”.

Select “IC”.

Select “Self Test”.

3. Verify the DTC according to the directions on the screen.

If any DTCs are displayed, perform troubleshooting according to the corresponding DTC inspection.

4. After completion of repairs, clear all DTCs stored in the TPMS. (See Clearing DTCs Procedure.)

Clearing DTCs Procedure

NOTE:

If the DTC clearing procedure is implemented, the TPMS warning light and flat tire warning light turn off.

1. Connect the M-MDS to the DLC-2.

2. After the vehicle is identified, select the following items from the initialization screen of the M-MDS.

When using the IDS (laptop PC)

Select “Self Test”.

Select “Modules”.

Select “IC”.

When using the PDS (Pocket PC)

Select “Module Tests”.

Select “IC”.

Select “Self Test”.

3. Verify the DTC according to the directions on the screen.

4. Press the clear button on the DTC screen to clear the DTC.

5. Verify that no DTCs are displayed.

PID/Data Monitor and Record Procedure

1. Connect the M-MDS to the DLC-2.

2. After the vehicle is identified, select the following items from the initialization screen of the M-MDS.

When using the IDS (laptop PC)

Select “DataLogger”.

Select “Modules”.

Select “IC”.

When using the PDS (Pocket PC)

Select “Module Tests”.

Select “IC”.

Select “DataLogger”.

3. Select the applicable PID from the PID table.

4. Verify the PID data according to the directions on the screen.

NOTE:

The PID data screen function is used for monitoring the calculated value of input/output signals in the module. Therefore, if the monitored value of the output parts is not within the specification, it is necessary to inspect the monitored value of input parts corresponding to the applicable output part control. In addition, because the system does not display an output part malfunction as an abnormality in the monitored value, it is necessary to inspect the output parts individually.

Active Command Modes Procedure

1. Connect the M-MDS to the DLC-2.

2. After the vehicle is identified, select the following items from the initialization screen of the M-MDS.

When using the IDS (laptop PC)

Select “DataLogger”.

Select “Modules”.

Select “IC”.

When using the PDS (Pocket PC)

Select “Module Tests”.

Select “IC”.

Select “DataLogger”.

3. Select the active command modes from the PID table.

4. Perform the active command modes, inspect the operations for each parts.

If the operation of output parts cannot be verified after the active command mode inspection is performed, this could indicate the possibility of an open or short circuit, sticking, or operation malfunction in the output parts.

Freeze Frame PID Data Access Procedure

1. Connect the M-MDS to the DLC-2.

2. After the vehicle is identified, select the following items from the initialization screen of the M-MDS.

This function is available for only the IDS (laptop PC)

Select “Body”.

Select “TPMS Functions”.

Select “Freeze Frame Data”.

DTC Table


DTC	Description	Page
M-MDS	Description	Page
B1342	Instrument cluster internal malfunction	(See DTC B1342 [INSTRUMENT CLUSTER].)
B2143	ID registration failure	(See DTC B2143.)
B2477	Instrument cluster configuration not performed	(See DTC B2477 [INSTRUMENT CLUSTER].)
B2868	Wheel unit No.1 internal malfunction	(See DTC B2868, B2869, B2870, B2871.)
B2869	Wheel unit No.2 internal malfunction	(See DTC B2868, B2869, B2870, B2871.)
B2870	Wheel unit No.3 internal malfunction	(See DTC B2868, B2869, B2870, B2871.)
B2871	Wheel unit No.4 internal malfunction	(See DTC B2868, B2869, B2870, B2871.)
U0127	Communication failure between instrument cluster and keyless receiver	(See DTC U0127.)
U2616	Wheel unit No.1 (No response)	(See DTC U2616, U2617, U2618, U2619.)
U2617	Wheel unit No.2 (No response)	(See DTC U2616, U2617, U2618, U2619.)
U2618	Wheel unit No.3 (No response)	(See DTC U2616, U2617, U2618, U2619.)
U2619	Wheel unit No.4 (No response)	(See DTC U2616, U2617, U2618, U2619.)

PID/DATA Monitor Table


PID Name (Definition)	Unit/ Condition	Condition/Specification	Action
AI_WU1_ID AI_WU2_ID AI_WU3_ID AI_WU4_ID (Wheel unit ID code (during ID registration))	–	Indicates the wheel unit ID code. (During wheel unit ID registration.)	Replace the wheel unit. Perform the wheel unit ID registration.
AI_WU1_P AI_WU2_P AI_WU3_P AI_WU4_P (Tire pressure value (during ID registration))	Pa, psi	Indicates the tire pressure. (During ID registration.)	Adjust tire pressure. Replace the wheel unit. Perform the wheel unit ID registration.
FFD1_WU1_P FFD1_WU2_P FFD1_WU3_P FFD1_WU4_P (Tire pressure value (freeze frame PID data 1))	Pa, psi	Indicates the tire pressure. (Freeze frame PID data 1)	Adjust tire pressure.
FFD2_WU1_P FFD2_WU2_P FFD2_WU3_P FFD2_WU4_P (Tire pressure value (freeze frame PID data 2))	Pa, psi	Indicates the tire pressure. (Freeze frame PID data 2)	Adjust tire pressure.
FFD1_WU1_T FFD1_WU2_T FFD1_WU3_T FFD1_WU4_T (Internal tire air temperature value (freeze frame PID data 1))	°C, °F	Indicates the internal tire air temperature. (Freeze frame PID data 1)	Adjust tire pressure.
FFD2_WU1_T FFD2_WU2_T FFD2_WU3_T FFD2_WU4_T (Internal tire air temperature value (freeze frame PID data 2))	°C, °F	Indicates the internal tire air temperature. (Freeze frame PID data 2)	Adjust tire pressure.
FFD1_MLG (Wheel unit mileage value (freeze frame PID data 1))	m, mi (ft)	Indicates the mileage. (Freeze frame PID data 1)	Adjust tire pressure.
FFD2_MLG (Wheel unit mileage value (freeze frame PID data 2))	m, mi (ft)	Indicates the mileage. (Freeze frame PID data 2)	Adjust tire pressure.
FFD1_SPD (Wheel unit speed value (freeze frame PID data 1))	KPH, MPH	Indicates the speed. (Freeze frame PID data 1)	Adjust tire pressure.
FFD2_SPD (Wheel unit speed value (freeze frame PID data 2))	KPH, MPH	Indicates the speed. (Freeze frame PID data 2)	Adjust tire pressure.
IC_DTC_CNT (Number of continuous DTCs)	–	DTCs detected: 1—255 No DTCs detected: 0	Perform the DTC inspection.
ID_LAST* (Last received tire transmitter ID code value)	–	Indicates the last ID that is transmitted from the wheel unit.	Replace the wheel unit. Perform the configuration.
ID_WU1* ID_WU2* ID_WU3* ID_WU4* (Registered wheel unit ID code)	–	Indicates the registered ID that is transmitted from the wheel unit.	Replace the wheel unit. Perform the wheel unit ID registration.
WU1_P* WU2_P* WU3_P* WU4_P* (Tire pressure value)	Pa, psi	Indicates the tire pressure. (See SUSPENSION TECHNICAL DATA.)	Adjust tire pressure. Replace the wheel unit.
WU1_T* WU2_T* WU3_T* WU4_T* (Internal tire air temperature value)	°C, °F	Indicates the internal tire air temperature.	Replace the wheel unit.

^*: Data transmission from the wheel unit occurs when the vehicle speed is 25 km/h {15.5 mph} or more. Due to this, the current air pressure and temperature data can only be displayed after the vehicle is driven at 25 km/h {15.5 mph} or more. Also, the ID_LAST, and tire pressure and internal tire air temperature data are erased when the instrument cluster connector and the battery terminal are disconnected. If the instrument cluster is replaced or the battery terminals are disconnected, drive the vehicle at 25 km/h {15.5 mph} or more and display the tire pressure PID after the data transmission.

Active Command Modes Table


Command Name	Definition	Operation	Note
IDR_MODE	Wheel unit ID registration mode	ON/OFF	Ignition switch at ON

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