Mazda 6 2002 Workshop Manual page 224

DTC P0327 Knock sensor circuit low 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.
• Check 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 SENSOR CIRCUITS FOR
OPEN CIRCUIT
• Disconnect knock sensor connector.
• Inspect continuity between the following
circuits:
— Knock sensor female terminal A (harness-
side) and PCM terminal 2S (harness-side)
— Knock sensor female terminal B (harness-
side) and PCM terminal 2P (harness-side)
• Are there continuities?
5 INSPECT KNOCK SENSOR CIRCUITS FOR
SHORT TO GROUND
• Inspect continuity between following circuits:
— Knock sensor female terminal A (harness-
side) and body ground
— Knock sensor female terminal B (harness-
side) and body ground
• Are there continuities?
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 8.
No Go to net step.
Yes Go to net step.
No Replace knock sensor, then go to net step.
Yes Go to net step.
No Repair or replace suspected wiring harness, then go to
Step 8.
Yes Repair or replace suspected wiring harness, then go to
Step 8.
No Go to net step.
ACTION
F–127
F