Mazda 626 Station Wagon, Workshop Manual

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ON-BOARD DIAGNOSTIC
DTC P0328
Except for GF4A-EL Models
DTC P0328
Knock sensor circuit high input
DETECTION
CONDITION
If PCM detects knock sensor voltage at PCM terminal 57 is above 4.0 V after ignition key turned to
ON, PCM determines that knock sensor circuit has malfunction.
POSSIBLE
CAUSE
Knock sensor malfunction
Connector or terminal malfunction
Open circuit in wiring between knock sensor terminal and PCM terminal 57
KNOCK SENSOR
KNOCK SENSO R
i i n
HA RNESS SIDE CO NN ECTO R
(VIEW FROM TER M IN A L SIDE)
PCM
57
T T T
PCM
n i l i i l i i i i
T T I . I I M . l . l I 1.1 l . l .
iT iT i T i r i r
i
V T rV i'i'i'i'i'iV i'i'i1!1,;
HA RNESS SIDE C O N N E C TO R
(VIEW FROM T ER M IN A L SIDE)
Diagnostic procedure
STEP INSPECTION ACTION
1 VERIFY RELATED REPAIR INFORMATION
AVAILABILITY
• Check for related Service Information
availability.
• Is any related Service Information available?
Yes Perform repair or diagnosis according to available
Service information.
• If vehicle is not repaired, then go to next step.
No Go to next step.
2 CHECK KNOCK SIGNAL CIRCUIT FOR OPEN
• Turn ignition key to OFF.
• Disconnect knock sensor connector.
• Measure voltage between knock sensor
terminal and body ground.
• Is voltage approx. 5 V?
Yes Then go to Step 4.
No Go to next step.
3 CHECK PCM CONNECTOR
• Disconnect PCM connector.
• Check for poor connection (damaged,
pulled-out terminals, corrosion, etc.).
• Are there any malfunctions?
Yes
Repair or replace terminal then go to Step 5.
No Repair or replace harness for open, then go to Step
5.
4 CHECK KNOCK SENSOR
• Measure resistance between knock sensor
terminal A and sensor body
• Is resistance within 550—570 £2?
Yes Go to next step.
No Replace knock sensor, then go to next step.
5
VERIFY TROUBLESHOOTING OF DTC P0328
COMPLETED
• Make sure to reconnect all disconnected
connectors.
• Clear DTC from PCM memory using NGS
tester.
• Start engine.
• Is same DTC present?
Yes Replace PCM, then go to next step.
No Go to next step.
F1-61