Suzuki RA410 Manual page 391

6E1-26 ENGINE AND EMISSION CONTROL SYSTEM
DTC NO. 17 KNOCK SENSOR CIRCUIT
(SIGNAL VOLTAGE HIGH OR LOW)
WIRING DIAGRAM
TERMINAL ARRANGEMENT OF ECM/PCM CONNECTOR (VIEWED FROM HARNESS SIDE)
TROUBLESHOOTING
STEP
1 Did you perform ENGINE DIAGNOSIS FLOW
TABLE in SECTION 6?
2 1) Remove ECM/PCM and connect connec-
tors to ECM/PCM.
2) With engine running, check voltage from
"A5" terminal of ECM/PCM connector to
body ground.
3) Is it about 2 V?
3 1) Stop engine.
2) With ignition switch at OFF position, dis-
connect knock sensor connector (1).
3) With ignition switch at ON position, check
voltage from "W" (2) to "Or" (3) wire termi-
nal of knock sensor connector.
4) Is it 4 – 5 V?
NOTE:
Upon completion of inspection and repair work, perform DTC CONFIRMATION PROCEDURE in this sec-
tion and confirm that the trouble has been corrected.
1
4
C14
ACTION
W
A5
Or
C14
3
YES
Go to step 2.
Knock sensor and its circuit
are in good condition.
Intermittent trouble or faulty
ECM/PCM.
Recheck, referring to INTER-
MITTENT TROUBLE in SEC-
TION 0A.
Faulty knock sensor.
Substitute a known-good
knock sensor and recheck.
2
1. ECM/PCM
2. Knock sensor
3. To other sensor
4. Knock sensor connector
A5
NO
Go to ENGINE DIAGNO-
SIS FLOW TABLE in
SECTION 6.
Go to step 3.
"W" wire open, "W" wire
shorted to ground circuit
or poor "A5" connection.
If wire and connection
are OK, substitute a
known-good ECM/PCM
and recheck.