Mazda 323 Workshop Manual Supplement page 145

F2
SELF-DIAGNOSlS FUNCTION
Troubleshooting
If a malfunction code number is shown on the SST (49 l-l01 8 9Ai, 49 B019 9AO), check for the cause
using the chart related to the code number shown, [Regarding code numbers except 05, 24, and 42, refer
to "Troubleshooting" in Workshop Manual [I 203-I O-89F (Europe) or 1204-f 0-89F (Australia)].
r C
:ODE No.
05 (KNOCK CONTROL UNIT)-BP TUR80
;TEP
2
3
I
INSPECTION
Check knock sensor and knock control unit
circuit for poor connectlon
ACTtON
Yes Repalr or replace connector
Check knock control unit terminal voltage with
ignition switch ON
Check that voltage at ECU terminal 2J is
approx. 4V at idle
rs7 page F2-64
Yes
Recheck ECU connector for
poor
connection
4 If OK, replace ECU
4 If not OK, repair or replace connector
NO
Repair wiring harness (R/Y) between
ECU terminal 2J and knock control unit
93GOF2-7:
Circuit Diagram
I
ECU
IGNITION
SWITCH
15A
BATTERY
MAIN
RELAY
(FUEL 1N.J)
l
W/L Y/i3 G/O W
RIB R/L
YIL
jr-
-- -
- 1 BlLG
- -
MCK CONTROL
I
.
:
MAIN RELAY (FUEL INJ)
W/G BIW
C&=&A
KNOCK CONTROL UNIT
W/R EMLG RN Y/L
1
KNOCK SENSOR