Mazda 6 2002, Workshop Manual

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ON-BOARD DIAGNOSTIC [MULTIPLEX COMMUNICATION SYSTEM]
T–141
T
T BODY ELECTRICAL SYSTEM
End Of Sie
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?
Replace any units that
do not respond.
Disconnect the PCM connector.
Measure the resistance between PCM
connector terminals 2R and 2U.
Is the resistance 118—130 ohms?
Replace the PCM.
Disconnect the instrument cluster connector.
Measure the resistance between instrument cluster connector
terminals 2W and 2X.
Is the resistance 118—130 ohms?
Replace the instrument
cluster.
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?
The disconnected unit or the
related wiring harness may
have a malfunction.
Replace the disconnected unit.
Replace the related wiring harness.
The disconnected
unit is normal.
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.
Yes
No
B
A
A
A
A
A
A
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,
O (CAN_H)—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?
Yes
No
Yes
No
Yes
No
Yes
No
Yes No
Yes
No
A6E8162L002