Mazda 6 2002 Workshop Manual page 226

DTC P0328 Knock sensor circuit high input
Diagnostic procedure
STEP
1 PERFORM DTC CONFIRMATION PROCEDURE
• Perform DTC CONFIRMATION PROCEDURE.
(See F–66 DTC CONFIRMATION
PROCEDURE.)
• Is same DTC present?
2 INSPECT KNOCK SENSOR CONNECTOR
TERMINAL
• Turn ignition key to OFF.
• Disconnect knock sensor connector.
• Inspect for poor connection at terminals A and
B (damaged, pulled-out pins, corrosion, etc.).
• Is there any malfunction?
3 INSPECT KNOCK SENSOR
• Perform knock sensor inspection.
(See F–56 KNOCK SENSOR
• Is knock sensor okay?
4 INSPECT KNOCK SIGNAL CIRCUIT FOR
SHORT TO POWER
• Turn ignition key ON (Engine OFF).
• Measure voltage between knock sensor
terminal A (harness-side) and body GND and
knock sensor terminal B (harness-side) and
body GND.?
• Is any voltage reading?
5 INSPECT PCM CONNECTOR
• Disconnect PCM connector.
• Inspect for poor connection (damaged, pulled-
out terminals, corrosion, etc.).
• Is there any malfunction?
ON-BOARD DIAGNOSTIC
INSPECTION
INSPECTION)
Yes Go to net step.
No Intermittent concern eists. Go to INTERMITTENT
CONCERN TROUBLESHOOTING procedure.
(See F–227 INTERMITTENT CONCERN
TROUBLESHOOTING.)
Yes Repair terminal, then go to step 6.
No Go to net step.
Yes Go to net step.
No Replace knock sensor, then go to step 6.
Yes Repair or replace harness for short to power, then go to
step 6.
No Go to net step.
Yes Repair or replace terminal, then go to step 6.
No Go to net step.
ACTION
F–129
F