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6-86 ENGINE GENERAL INFORMATION AND DIAGNOSIS
DTC P0325 (DTC NO.17) KNOCK SENSOR CIRCUIT MALFUNCTION
WIRING DIAGRAM / CIRCUIT DESCRIPTION
[A] : Case of TYPE A is shown (See NOTE)
NOTE:
For TYPE A and TYPE B, refer to NOTE in "ECM VOLTAGE VALUES TABLE" for applicable model.
DTC DETECTING CONDITION
• Knock sensor voltage is 3.91 V or more
or
• Knock sensor voltage is 1.23 V or less
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
Step
1
Was "ENGINE DIAG. FLOW TABLE" per-
formed?
2
Check Knock Sensor Signal.
1) With engine running, check voltage from
C42-12 terminal of ECM connector to body
ground. See Fig. 1.
Is voltage about 1.23 – 3.91 V?
3
Check Knock Sensor Output.
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 "RED" terminal of knock sen-
sor connector to body ground. See Fig. 2.
Is it 4 – 5 V?
C42 (31P)
9
8
7
6
5
4
3
2
1
21
20
19
18
17
16
15
14
13
12
11
10
31
30
29
28 27
26
25
24
23
22
[B] : Case of TYPE B is shown (See NOTE)
Action
RED
E11
C41 (24P)
G02 (17P)
7
6
5
4
3
2
1
6
5
16
15
14
13 12
11
10
9
8
12
11
24
23
22
21
20
19
18
17
17
16
POSSIBLE CAUSE
• "RED" circuit open or shorted to ground
• Knock sensor malfunction
• ECM malfunction
Yes
Go to Step 2.
Knock sensor and its cir-
cuit are in good condition.
Intermittent trouble or
faulty ECM.
Recheck, referring to
Intermittent Trouble in
Section 0A.
Faulty knock sensor.
Substitute a known-good
knock sensor and
recheck.
ECM
5V
C42-12 [A]
C42-25 [B]
4
3
2
1
10
9
8
7
15
14
13
No
Go to "ENGINE DIAG.
FLOW TABLE".
Go to Step 3.
"RED" wire open, shorted
to ground circuit or poor
C42-12 (Case of TYPE A.
See NOTE) or 42-25
(Case of TYPE B. See
NOTE) connection.
If wire and connection are
OK, substitute a known-
good ECM and recheck.
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