Mazda CX 7. Manual — part 156

SYMPTOM TROUBLESHOOTING

02-03–1

02-03

02-03

SYMPTOM TROUBLESHOOTING

TIRE PRESSURE

MONITORING SYSTEM (TPMS)
WIRING DIAGRAM . . . . . . . . . . . . . . . . 02-03–2

With Advanced Keyless System. . . . . . 02-03–2
With Keyless Entry System . . . . . . . . . 02-03–2

FOREWORD . . . . . . . . . . . . . . . . . . . . . . 02-03–2
PRECAUTION . . . . . . . . . . . . . . . . . . . . . 02-03–3

Intermittent Concern

Troubleshooting. . . . . . . . . . . . . . . . . 02-03–3

SYMPTOM TROUBLESHOOTING . . . . . 02-03–4

No.1 TPMS WARNING LIGHT

ILLUMINATES CONTINUOUSLY . . . . . 02-03–4

No.2 TPMS WARNING LIGHT

(LOW PRESSURE WARNING)
ILLUMINATES AFTER ENGINE
START AND TURNS OFF AFTER
DRIVING FOR PERIOD OF TIME . . . . . 02-03–5

No.3 WHEEL UNIT ID REGISTRATION

CANNOT BE PERFORMED
(TPMS WARNING LIGHT FLASHES) . . 02-03–6

Display Of M-MDS (Example) . . . . . . . . 02-03–7

End of Toc

WM: TIRE PRESSURE MONITORING SYSTEM

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SYMPTOM TROUBLESHOOTING

02-03–2

TIRE PRESSURE MONITORING SYSTEM (TPMS) WIRING DIAGRAM

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With Advanced Keyless System

With Keyless Entry System

End Of Sie

FOREWORD

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• Before performing the steps in Symptom Troubleshooting, perform the On-board Diagnostic Inspection. To

check the DTC, follow the DTC Inspection steps. (See 02-02-3 TIRE PRESSURE MONITORING SYSTEM
(TPMS) ON-BOARD DIAGNOSIS.)

End Of Sie

NO.1

ANTENNA

NO.2

NO.3

NO.4

RF SIGNAL

CAN
DRIVER

CAN_H

CAN_L

PCM

WHEEL UNIT

E

C

A

KEYLESS
RECEIVE

KEYLESS CM

INSTRUMENT
CLUSTER

3Q

2N

2R

2T

2A

2B

DLC-2

3A

3C

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NO.1

ANTENNA

NO.2

NO.3

NO.4

RF SIGNAL

CAN
DRIVER

CAN_H

CAN_L

PCM

WHEEL UNIT

E

D

B

A

INSTRUMENT
CLUSTER

2N

2R

2T

2A

DLC-2

KEYLESS
RECEIVER

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SYMPTOM TROUBLESHOOTING

02-03–3

02-03

PRECAUTION

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Intermittent Concern Troubleshooting
Vibration method

• If malfunction occurs or becomes worse while driving on a rough road or when the engine is vibrating, perform

the steps below.

Note

• There are several reasons why vehicle or engine vibration could cause an electrical malfunction. Some of

the things to check for are:

— Connectors not fully seated.

— Wire harnesses not having full play.

— Wires laying across brackets or moving parts.

— Wires routed too close to hot parts.

• An improperly routed, improperly clamped, or loose harness can cause wiring to become pinched

between parts.

• The connector joints, points of vibration, and places where wire harnesses pass through the firewall, body

panels and other panels are the major areas to be checked.

Inspection method for switch and/or sensor connectors or wires

1. Connect M-MDS to DLC-2.
2. Turn the ignition switch to the ON position (engine off).

Note

• If engine starts and runs, perform the following steps at idle.

3. Access PIDs for the switch you are inspecting.
4. Turn switch on manually.
5. Shake each connector or wire harness a bit

vertically and horizontally while monitoring the
PID.

• If PID value is unstable, check for poor

connection.

Inspection method for sensors

1. Connect M-MDS to DLC-2.
2. Turn the ignition switch to the ON position (engine off).

Note

• If engine starts and runs, perform the following steps at idle.

3. Access PIDs for the switch you are inspecting.
4. Vibrate the sensor slightly with your finger.

• If PID value is unstable or malfunction occurs, check for poor connection and/or poorly mounted sensor.

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SYMPTOM TROUBLESHOOTING

02-03–4

Connector terminal check method

1. Check the connection condition of each female terminal.
2. Insert male terminal; fit the female terminal side

to female terminal and check to see whether the
malfunction is in the female terminal or not.

End Of Sie

SYMPTOM TROUBLESHOOTING

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End Of Sie

No.1 TPMS WARNING LIGHT ILLUMINATES CONTINUOUSLY

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Caution

• The tire pressure cannot be measured accurately after driving for a long period due to the internal

temperature and pressure. Stop the vehicle for approx. 1 hour and then perform the tire pressure
measurement and adjustment.

• Use a high accuracy digital gauge for measurement of the tire pressure.

Note

• If the DTC clearing procedure is implement, the TPMS warning light turns off.

End Of Sie

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No.

Symptom

1

TPMS warning light illuminates continuously.

2

TPMS warning light (low pressure warning) illuminates after engine start and turns off after driving for a period
of time.

3

Wheel unit ID registration cannot be performed (TPMS warning light flashes).

1

TPMS warning light illuminates continuously

[TROUBLESHOOTING HINTS]

• Tire pressure is lower than the specification.

STEP

INSPECTION

ACTION

1

INSPECT THE TIRE

• Is there any foreign object adhering to the

tire?

Yes

Remove any foreign object. Replace the tire if necessary,
and then go to the next step.

No

Go to the next step.

2

INSPECT THE TIRE PRESSURE

• Is the tire pressure lower than the

specification?

Yes

Adjust the tire pressure to the specification when the engine
is cold, and then go tot the next step.

No

Go to the next step.

3

DOES THE TPMS WARNING LIGHT TURN
OFF?

Yes

Troubleshooting completed. Explain to the customer what
has been repaired.

No

Go to the next step.

4

DRIVE THE VEHICLE AT 25 KM/H FOR 10
MIN.

• Does the TPMS warning light turn off?

Yes

Troubleshooting completed. Explain to the customer what
has been repaired.

No

Adjust the tire pressure to the specification, and then return
to Step 1.

Note

• If the TPMS warning light does not turn off after

repeating this step, the tire may be flat.

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