Suzuki GRAND VITARA Owner's Manual page 249

Step
3 Throttle actuator circuit check
1) Disconnect connector from electric throttle body
assembly with ignition switch turned OFF.
2) Check for proper connection to electric throttle body
assembly at "BLU/YEL" and "BLU/RED" wire terminals.
"BLU/YEL"
"BLU/RED"
"BLK"
3) Disconnect connectors from ECM.
4) Check for proper connection to ECM at "C37-45" and
"C37-44" terminals.
5) Measure resistance at following connector terminals.
• Between "BLU/YEL" wire terminal of electric throttle
body assembly connector and "C37-45" terminal of
ECM connector
• Between "BLU/RED" wire terminal of electric throttle
body assembly connector and "C37-44" terminal of
ECM connector
Is each resistance below 3
4 Electric throttle body assembly check
1) Check electric throttle body assembly referring to
"Electric Throttle Body Assembly and Its Circuit Check"
under "Electric Throttle Body Assembly On-Vehicle
Inspection: in Section 1C".
Is check result satisfactory?
Action
For J20 engine
"RED"
"GRN"
"WHT"
"BLK"
For M16 engine
"GRN"
"RED"
"BLU/YEL"
"WHT"
"BLU/RED"
Ω
?
Engine General Information and Diagnosis:
Yes
Go to Step 4.
I5JB0A110042-01
I5JB0A110043-01
Substitute a known-
good ECM and recheck.
1A-194
No
"BLU/YEL" wire and/or
"BLU/RED" wire is open
or high resistance.
Replace electric throttle
body assembly.