Dtc "C42" (P1650): Ig Switch Circuit Malfunction - Suzuki Intruder VZ1500 Service Manual

1A-79 Engine General Information and Diagnosis:
Step
1 1) Turn the ignition switch OFF.
2) Remove the front seat. Refer to "Exterior Parts Removal
and Installation in Section 9D (Page 9D-5)".
3) Check the FP relay coupler (1) for loose or poor
contacts.
If OK, then check the FP relay. Refer to "Fuel Pump
Relay Inspection in Section 1G (Page 1G-6)".
Is the FP relay OK?

DTC "C42" (P1650): IG Switch Circuit Malfunction

Detected Condition and Possible Cause
Detected Condition
Ignition switch signal is not input to the ECM.
Troubleshooting
NOTE
• Refer to "Ignition Switch Inspection in Section 1H (Page 1H-9)" for details.
• After repairing the trouble, clear the DTC using SDS tool. Refer to "Use of SDS Diagnosis Reset
Procedures (Page 1A-13)".
Action
1
Yes
• Y/B or O/W wire open
or shorted or poor
"34" connection.
• Y/R or R/Bl wire
open, shorted or poor
"9" connection.
• If wire and
connection are OK,
intermittent trouble or
faulty ECM.
• Recheck each
terminal and wire
harness for open
circuit and poor
connection.
• Replace the ECM
with a known good
one, and inspect it
I940H1110071-01
again. Refer to "ECM
Removal and
Installation in Section
1C (Page 1C-1)".
Possible Cause
• Ignition system circuit open or short.
• ECM malfunction.
No
Replace the FP relay
with a new one.
B940H21104023