C40" (P0505-H/L Or P0506 And P0507) Isc Valve Circuit Malfunction - Suzuki Intruder VZR1800 Service Manual

5-70 FI SYSTEM DIAGNOSIS

"C40" (P0505-H/L or P0506 and P0507) ISC VALVE CIRCUIT MALFUNCTION

DETECTED CONDITION
C40 ISC valve motor current is higher than
H
P0505 the specified value.
ISC valve motor circuit is open.
L
P0506 Idle speed is lower than the desired idle
speed.
P0507 Idle speed is higher than the desired
idle speed.
ISC valve
"
Be careful not to disconnect at least 3 seconds after
ignition switch is turned to OFF.
If the ECM coupler is disconnected within 3 seconds
after ignition switch is turned to OFF, there is a possi-
bility of an usual valve being written in ECM and caus-
ing an error of ISC valve operation.
• ISC valve circuit shorted to BATT or ground circuit
open
• ISC valve circuit open or shorted to ground or
BATT circuit open
• W/Y or Lg wire open or short
• ISC valve is fixed
• Air curcuit clogged
• W/Y or Dgr wire open or short
• Disconnected ISC valve hose
Lbl
W
Dgr
R/Bl
Lg
12 V
POSSIBLE CAUSE
ECM
IS1A
IS1B
IS2A
BATT
IS2B