Suzuki WagonR+ RB310 Service Manual page 706

Troubleshooting
Step
1 Was "Engine and Emission Control System
Check" performed?
2 Idle Speed Check
1) Check idle speed/idle air control duty refer-
ring to "Idle Speed/Idle Air Control Duty
Inspection" in Section 6E1.
Is check result as specified?
3 Idle Air Control Valve Operation Check
1) Check idle air control valve for operation
referring to "Idle Air Control (IAC) Valve
Operation Check" in this section.
Is check result satisfactory?
4 Idle Air Control Valve Circuit Check
1) Disconnect connector from idle air control
valve with ignition switch turned OFF.
2) Turn ON ignition switch, measure voltage
between "BLK/RED" wire terminals of idle
air control valve connector and engine
ground.
Is voltage 10 – 14 V?
5 Idle Air Control Valve Check
1) Check idle air control valve for resistance
referring to "Idle Air Control (IAC) Valve
Check" in this section.
Is check result satisfactory?
6 Idle Air Control Valve Circuit Check
1) Disconnect connectors from ECM with igni-
tion switch turned OFF.
2) Measure resistance between "BLK/RED"
wire terminal of idle air control valve con-
nector and "E23-8" terminal of ECM con-
nector.
Are resistance 2
7 Idle Air Control Valve Circuit Check
1) Measure resistance between "E23-8" termi-
nal of ECM connector and vehicle body
ground.
Is resistance infinite?
8 Idle Air Control Valve Circuit Check
1) Connect connectors to ECM.
2) Turn ON ignition switch, measure voltage
between "E23-8" terminal of ECM connector
and vehicle body ground.
Is each voltage 0 V?
Action
Ω or less?
ENGINE GENERAL INFORMATION AND DIAGNOSIS (M13 ENGINE) 6-2-135
Yes
Go to Step 2.
Go to Step 3.
Intermittent trouble.
Check for intermittent
referring to "Intermittent
and Poor Connection
Inspection" in Section 0A.
If OK, substitute a known-
good ECM and recheck.
Go to Step 5.
Go to Step 6.
Go to Step 7.
Go to Step 8.
Replace idle air control
valve.
No
Go to "Engine and Emis-
sion Control System
Check" in this section.
Go to Step 4.
Go to Step 4.
"BLK/RED" wire in open
or high resistance circuit.
Replace idle air control
valve.
"BLK/RED" or "GRN/YEL"
wire in open or high resis-
tance circuit.
"BLK/RED" or "GRN/REL"
wire in shorted to ground
circuit.
"BLK/RED" or "GRN/YEL"
wire in shorted to power
circuit.