Code No. 05 (Knock Sensor And Knock Control Unit) - Mazda 626 MX-6 Workshop Manual

4 B TROUBLESHOOTING WITH SST

Code No. 05 (Knock sensor and Knock control unit)

Are there poor connections in relative circuit?
Are knock control unit terminal voltages correct?
Terminal
RB wire
RY wire
YL wire
BLg wire
after performing after­
Is same Code No. present
repair procedure? (Refer tc
Is engine control unit 1R terminal voltage OK?
(Refer to page 4B—106)
4B-20
YES
NO
NO
wires)
Voltage
Approx. 12V
(only
3.3—5.0V
OV wire) PC: Knock sensor, knock control unit, or related har­
YES
(only
wire) PC: Open circuit in wiring harness between knock
page 4B—11)
YES
YES
Repair or replace connector
(all
PC: • Open or short circuit in wiring harness be­
tween main relay and knock control unit
• Open circuit in wiring harness between knock
control unit and ground
RY
ness malfunction
YL
control unit and knock sensor
NO
Knock control unit, knock sensor, and circuit OK
NO
PC: Open or short circuit in wiring harness
Knock control unit malfunction
PC: Engine control unit malfunction
PC: Possible Cause
86U04B-011