Suzuki Liana RH413, Service Manual

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1A-127 Engine General Information and Diagnosis:
4 Is engine idle speed kept specified speed even with steering
wheel turned to the right or left as far as it stops (vehicle with
power steering system)? System is in good
condition. Check power steering
pressure switch signal
circuit referring to
“Power Steering
Pressure (PSP) Switch
Signal Circuit Check”.
If check result is OK,
check IAC system for
operation referring to
Step 3 or Step 4 of “DTC
P0505: Idle Control
System Malfunction”.
5 Was idle speed higher than specification in Step 1? Go to Step 6. Go to Step 9.
6 1) Check A/C (input) signal circuit referring to Step 2 of “A/
C Control System Check (Vehicle with A/C)”, if
equipped. (A/C signal can be also checked by using
SUZUKI scan tool.)
Is it in good condition?
Go to Step 7. Repair or replace A/C
signal circuit or A/C
system.
7 1) Check IAC system referring to Step 3 or Step 4 of “DTC
P0505: Idle Control System Malfunction”.
Is check result satisfactory?
Go to Step 8. Go to Step 5 of “DTC
P0505: Idle Control
System Malfunction”.
8 Was IAC duty less than about 3% (or more than about 97%)
for OFF duty meter in Step 1? Check abnormal air
inhaling from air intake
system, PCV valve and
EVAP canister purge
control system. Check TP sensor
(closed throttle position)
and ECT sensor for
performance.
If sensors are OK,
substitute a known-
good ECM.
9 Is SUZUKI scan tool available? Go to Step 10. Go to Step 11.
10 Check PNP signal (“D” range signal)
1) Connect SUZUKI scan tool to DLC with ignition switch
OFF.
2) Turn ignition switch ON and check PNP signal (“P/N”
and “D” range) on display when shifting selector lever to
each range.
PNP signal
“P” and “N” range: P/N range
“R”, “D”, “2” and “L” range: D range
Is check result satisfactory?
Go to Step 12. Repair or replace.
Step Action Yes No