Suzuki WagonR+ RB310 Service Manual page 1846

DTC P0505
INSPECTION
STEP
1 Was "ENGINE DIAG. FLOW TABLE" performed?
2 Check Idle Control System.
1) Connect SUZUKI scan tool to DLC with ignition
switch OFF, set parking brake and block drive
wheels.
2) Warm up engine to normal operating
temperature.
3) Clear DTC and select "MISC TEST" mode on
SUZUKI scan tool.
Is it possible to control (increase and reduce)
engine idle speed by using SUZUKI scan tool?
3 Check ISC Relay.
1) Ignition switch OFF and remove ISC relay
("ISCA").
2) Check for proper connection to ISC relay at
terminals 3 and 4.
3) Check resistance between each two terminals.
Between terminals 1 and 2: Infinity
Between terminals 3 and 4: 100 – 120 Ω
4) Check that there is continuity between
terminals 1 and 2 when battery is connected to
terminals 3 and 4.
Is ISC relay in good condition?
4 Check Idle Speed Control Actuator.
1) Check ISC actuator operation by referring to
ISC ACTUATOR INSPECTION in Section
6E1.
Is it good condition?
Fig. 1 for Step 3
ACTION
Fig. 2 for Step 3
1. ISC relay
GENERAL INFORMATION AND ENGINE DIAGNOSIS 6-1-83
YES
Go to Step 2.
Check TP sensor (Go to
DTC P0121 Flow Table)
If TP sensor is OK,
intermittent trouble or
faulty ECM (PCM).
Check for intermittent
referring to "Intermittent
and Poor Connection"
in Section 0A.
Go to Step 4.
Check "GRN/RED",
"GRN", "GRN/WHT"
and "BLU/RED" circuit
for open and short.
If wires and connections
are OK, substitute a
known-good ECM
(PCM) and recheck.
Fig. 3 for Step 3
NO
Go to "ENGINE DIAG.
FLOW TABLE".
Go to Step 3.
Replace ISC relay.
Replace throttle body
with ISC actuator.