ENGINE GENERAL INFORMATION AND DIAGNOSIS (H25 ENGINE) 6-1-101
DTC P0325 (DTC No.43) Knock Sensor Circuit Malfunction
CIRCUIT DESCRIPTION
DTC CONFIRMATION PROCEDURE
1) Connect scan tool to DLC with ignition OFF.
2) Turn ON ignition switch and clear DTC by using scan tool and run engine at idle speed for 5 sec. or more.
3) Check DTC by using scan tool.
INSPECTION
[A] : Terminal arrangement of ECM (PCM) coupler viewed from harness side 1. Knock sensor 2. ECM (PCM)
DTC DETECTING CONDITION TROUBLE AREA
• Knock sensor output voltage: 3.98 V or more
• Knock sensor output voltage: 0.90 V or less
•“W” circuit open or shorted to ground
• Knock sensor malfunction
• ECM malfunction
Step Action Yes No
1 Was "Engine Diag. Flow Table" performed? Go to Step 2. Go to “Engine Diag. Flow
Ta bl e ”.
2 1) With engine running, check voltage from
C51-3-18 terminal of ECM connector to
body ground.
Is voltage about 0.90 – 3.98 V?
Knock sensor and its cir-
cuit are in good condition.
Intermittent trouble or
faulty ECM. Recheck,
referring to “Intermittent
Te ro ubl e ” in Section 0A.
Go to Step 3.
3 1) Stop engine.
2) With ignition switch at OFF position, discon-
nect knock sensor connector. See Fig. 1.
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?
Substitute a known-good
knock sensor and
recheck.
“W” wire open, shorted to
ground circuit or poor
C51-3-18 connection.
If wire and connection are
OK, substitute a known-
good ECM and recheck.
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