C24" Or "C25" Ignition System Malfunction; C28" Stv Actuator Circuit Malfunction - Suzuki GSX1400 Service Manual

4-42 FI SYSTEM

"C24" or "C25" IGNITION SYSTEM MALFUNCTION

*REFER TO THE IGNITION SYSTEM FOR DETAILS. (

"C28" STV ACTUATOR CIRCUIT MALFUNCTION

DETECTED CONDITION
The operation voltage does not reach the STVA.
ECM does not receive communication signal from
the STVA.
INSPECTION
• Lift and support the fuel tank with a proper stay. (
1
Turn the ignition switch OFF.
Check the STVA lead wire coupler for loose or poor con-
tacts.
Disconnect the STVA lead wire coupler.
Check the continuity between Red wire and ground.
STVA continuity: ∞Ω
If OK, then measure the STVA resistance. (between Red
and Black wires)
STVA resistance: Approx. 4.8 – 7.2 Ω Ω Ω Ω Ω
09900-25008: Multi circuit tester
Tester knob indication: Resistance (Ω Ω Ω Ω Ω )
Yes
Loose or poor contacts on the STVA coupler, or poor J or L
connection. ( 4-22)
If wire and connection are OK, intermittent trouble or faulty
ECM. Recheck each terminal and wire harness for open cir-
cuit and poor connection. (
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∞Ω (Infinity) ∞Ω ∞Ω
∞Ω
(+ Red – - Black)
No
Replace the STVA
with a new one.
4-4)
Replace the ECM with
new one, and inspect it
again.
7-20)
POSSIBLE CAUSE
• STVA malfunction.
• STVA circuit open or short.
• STVA motor malfunction.
1
4-48)
1
9
ECM coupler