FI SYSTEM 4-33
“C12” CKP SENSOR CIRCUIT MALFUNCTION
INSPECTION
DETECTED CONDITION POSSIBLE CAUSE
No CKP sensor signal for 3 seconds at engine
cranking.
• Metal particles or foreign material being attached
on the CKP sensor and rotor tip.
• CKP sensor circuit open or short.
• CKP sensor malfunction.
• ECM malfunction.
• Remove the left frame cover. (
:
6-5)
1
2
Ye s
Ye s
No
No
Replace the CKP sensor
with a new one.
Loose or poor contacts on the CKP
sensor coupler or ECM coupler.
Clean the CKP sensor and rotor tips
or replace the CKP sensor with a
new one.
Blue or Green wire open or shorted to ground, or poor
P
or
T
connection. (
:
4-22)
If wire and connection are OK, intermittent trouble or faulty ECM.
Recheck each terminal and wire harness for open circuit and
poor connection. (
:
4-5)
Turn the ignition switch OFF.
Check the CKP sensor coupler for loose or poor contacts.
If OK, then measure the CKP sensor resistance.
Disconnect the CKP sensor coupler and measure the
resistance.
;
CKP sensor resistance: 130 – 240 Ω
(Blue – Green)
If OK, then check the continuity between each terminal
and ground.
;
CKP sensor continuity: ∞Ω (Infinity)
Blue – Ground
Green – Ground
z
09900-25008: Multi circuit tester
t
Tester knob indication: Resistance (Ω)
( )
Disconnect the CKP sensor coupler.
Crank the engine a few seconds with the starter motor,
and measure the CKP sensor peak voltage at the coupler.
;
CKP sensor peak voltage: More than 3.7 V
(Blue – Green)
Repeat the above test procedure a few times and
measure the highest peak voltage.
If OK, then measure the CKP sensor peak voltage at the
ECM terminals. (N+/N– or
P
/
T
)
z
09900-25008: Multi circuit tester
u
Tester knob indication: Voltage (
-
)
Replace the ECM with a new one,
and inspect it again.
Peak volt adapter
V
Peak volt adapterPeak volt adapter
ECM couplers
Ω
Ω
1
2
26 30
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