ENGINE GENERAL INFORMATION AND DIAGNOSIS 6-77
DTC P0325 (DTC No.17) Knock Sensor Circuit Malfunction
CIRCUIT DESCRIPTION
DTC CONFIRMATION PROCEDURE
1) Clear DTC, start engine and keep it at idle for 1 min.
2) Select “DTC” mode on scan tool and check DTC.
INSPECTION
DTC DETECTING CONDITION POSSIBLE CAUSE
• Knock sensor voltage is 3.91 V or more
• Knock sensor voltage is 1.23 V or less
•“W” circuit open or shorted to ground
• Knock sensor malfunction
• ECM malfunction
Step Action Yes No
1Was “Engine Diag. Flow Table” performed? Go to Step 2. Go to “Engine Diag. Flow
Table”.
2 1) With engine running, check voltage from
“E19-25” terminal of ECM connector to
body ground. See Fig. 1.
2) Is voltage about 1.25 – 3.75 V?
Knock sensor and its cir-
cuit are in good condition.
Intermittent trouble or
faulty ECM.
Recheck, referring to
“Intermittent Trouble” in
Section 0A.
Go to Step 3.
3 1) Stop engine.
2) With ignition switch at OFF position, discon-
nect knock sensor connector.
3) With ignition switch at ON position, check
voltage from “W” to body ground terminal of
knock sensor connector. See Fig. 2.
Is it 4 – 5 V?
Faulty knock sensor.
Substitute a known-good
knock sensor and
recheck.
“W” wire open, shorted to
ground circuit or poor
“E19-25” connection.
If wire and connection are
OK, substitute a known-
good ECM and recheck.
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