Mazda 2002 6 Workshop Manual page 1040

ON-BOARD DIAGNOSTIC [MULTIPLEX COMMUNICATION SYSTEM]
Connect each unit connector.
Turn the ignition switch to the ON position.
Measure the voltage between DLC-2 terminals CAN_L and CAN_H.
Is the voltage 2.0—3.0 V?
Turn the ignition switch to the LOCK position.
Measure the resistance between DLC-2 terminals CAN_L and
CAN_H.
Is the resistance 59—65 ohms?
Yes
Replace any units that
do not respond.
A
Disconnect the instrument cluster connector.
Measure the resistance between instrument cluster connector
terminals 2W and 2X.
Is the resistance 118—130 ohms?
Yes No
A Replace the instrument
cluster.
A
End Of Sie
ON-BOARD DIAGNOSTIC [MULTIPLEX COMMUNICATION SYSTEM]
B
Yes
No
Disconnect the PCM connector.
Measure the resistance between PCM
connector terminals 2R and 2U.
Is the resistance 118—130 ohms?
No
Yes
Replace the PCM.
Turn the ignition switch to the LOCK position.
Verify the continuity between the following connector terminals of any disconnected unit.
PCM connector: 2R (CAN_L)—other terminals, 2U (CAN_H)—other terminals
ABS (ABS/TCS) HU/CM connector: R (CAN_L)—other terminals,
DSC HU/CM connector: AF (CAN_L)—other terminals, AG (CAN_H)—other terminals
Instrument cluster connector: 2W (CAN_L)—other terminals, 2X (CAN_H)—other terminals
Is there continuity?
Replace the related wiring harness.
T B ODY ELECTRICAL SYSTEM
No
Turn the ignition switch to the LOCK position.
Disconnect the connector of any unit that does not respond.
(If there are two or more units that do not respond,
disconnect only one of the units.)
Turn the ignition switch to the ON position.
Measure the voltage between DLC-2 terminals CAN_L and
CAN_H.
Is the voltage 2.0—3.0 V?
Yes
The disconnected unit or the
related wiring harness may
have a malfunction.
Are all units that do not respond disconnected?
Inspect if the related wiring harnesses (CAN_L
and/or CAN_H) have been shorted (to power
supply or ground).
If a short is found, replace the related wiring
harness.
O (CAN_H)—other terminals
Yes
A
No
The disconnected
unit is normal.
No
Yes
A
No
Replace the disconnected unit.
A
A6E8162L002
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