Suzuki Liana RH418 Supplementary Service Manual page 118

1A-105 Engine General Information and Diagnosis:
Troubleshooting
Step
1 Do you have SUZUKI scan tool?
2 PSP switch signal circuit check
1) Connect SUZUKI scan tool to DLC with ignition switch
OFF.
2) Start engine and select "DATA LIST" mode on scan tool.
3) Check power steering pressure switch.
Power steering pressure switch specification
Engine running and steering wheel at straight-ahead
position: OFF
Engine running and steering wheel turned to the
right or left as far as it stops: ON
Is it in good condition?
3 PSP switch signal circuit check
1) Turn ignition switch ON.
2) Check for voltage at terminal "C41-5" of ECM connector
connected.
Power steering pressure switch specification
Engine running and steering wheel at straight-ahead
position: 10 – 14 V
Engine running and steering wheel turned to the
right or left as far as it stops: 0 – 1 V
Is each voltage as specified?
4 Check wire harness
1) Turn ignition switch OFF and disconnect PSP switch
connector.
2) Check for proper connection to PSP switch.
3) If OK, then check voltage at "YEL" wire terminal with
ignition switch ON.
Is it 10 – 14 V?
Action
I2RH0B110089-01
Yes
Go to Step 2.
Signal circuit is in good
condition.
Signal circuit is in good
condition.
Power steering
pressure switch
malfunction or power
steering system
malfunction.
No
Go to Step 3.
Go to Step 4.
Go to Step 4.
"YEL" wire open or
shorted to ground or
Poor "C41-5"
connection.
If wire and connection
are OK, substitute a
known-good ECM and
recheck.