Mazda RX-8 Workshop Manual page 2360

POOR CONNECTION OF EPS CONTROL MODULE OR
PIN DEFORMATION
Turn the ignition switch off.
Inspect connection of the EPS control module
and wiring harness.
Disconnect the EPS control module connector.
Inspect whether malfunction is caused by
bent or poorly connected EPS control module
connector pin.
Are the connector connection, connector pins,
and wiring harness normal?
INSPECT EPS MOTOR POWER SUPPLY CIRCUIT FOR
3
OPEN CIRCUIT
Disconnect the battery positive terminal.
Inspect for continuity between EPS control
module terminal 1A and battery positive
terminal.
Is there continuity?
INSPECT EPS MOTOR POWER SUPPLY CIRCUIT FOR
4 SHORT TO GROUND
Measure the voltage between EPS control
module terminal 1A and ground.
Is there continuity?
INSPECT EPS MOTOR CIRCUIT FOR OPEN CIRCUIT
5
Disconnect the noise filter connector.
Inspect for continuity between the EPS
control module terminals and noise filter
terminals.
Is there continuity?
INSPECT EPS MOTOR CIRCUIT FOR OPEN CIRCUIT
6
Disconnect the EPS motor connector.
Inspect for continuity between the EPS motor
terminals and noise filter terminals.
Is there continuity?
EPS control module terminal
4A—noise filter terminal a.
EPS control module terminal
4B—noise filter terminal b.
EPS motor terminal A—noise
filter terminal a.
EPS motor terminal B—noise
filter terminal b.
No Repair or replace the faulty connector wiring harness,
then go to Step 6.
YesGo to the next step.
No Repair or replace the wiring harness for open circuit
between the EPS control module and battery, then go
to Step 10.
YesRepair or replace the wiring harness for short to
ground between the EPS control module and battery,
then go to Step 10.
No Go to the next step.
YesGo to the next step.
No Replace the noise filter, then go to Step 10.
YesGo to next step.
No Repair or replace the wiring harness for open circuit
between the EPS motor and noise filter, then go to
Step 10.