Suzuki 2000 Grand Vitara SQ416, Service Manual

Page: 74 / 729

YH4
GRAND
VITARA
1. Knock sensor
6-70 ENGINE DIAGNOSIS (G16 / J20 ENGINES)
DTC P0325 (DTC No.43) KNOCK SENSOR CIRCUIT MALFUNCTION
CIRCUIT DESCRIPTION
DTC DETECTING CONDITION TROUBLE AREA
Knock sensor output voltage: 3.98 V or more
Knock sensor output voltage: 0.90 V or less
“B” circuit open or shorted to ground
Knock sensor malfunction
ECM malfunction
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
STEP ACTION YES NO
1 Was “ENGINE DIAG. FLOW TABLE” performed? Go to Step 2. Go to “ENGINE
DIAG. FLOW TABLE”.
2 1) With engine running, check voltage from C51-3-3
terminal of ECM connector to body ground.
2) Is voltage about 0.90 – 3.98 V?
Knock sensor and its
circuit are in good
condition.
Intermittent trouble or
faulty ECM. Recheck,
referring to INTER-
MITTENT TROUBLE
in Section 0A. Go to Step 3.
3 1) Stop engine.
2) With ignition switch at OFF position, disconnect
knock sensor connector.
3) With ignition switch at ON position, check voltage
from “B” to body ground terminal of knock sensor
connector. See Fig. 1.
4) Is it 4 – 5 V?
Substitute a known-
good knock sensor
and recheck. “B” wire open, shorted
to ground circuit or poor
C51-3-3 connection.
If wire and connection
are OK, substitute a
known-good ECM and
recheck.