Suzuki Swift Sport 2004 Service & Repair Manual page 911

DTC Troubleshooting
Step
1 Was "EPS System Check" performed?
2 DTC check
1) Clear DTC(s) referring to "DTC Clearance".
2) Run engine at idle speed.
3) Check if any DTC is detected referring to "DTC Check".
Is DTC C1122 still detected?
3 DTC check
1) Check ECM for DTC referring to "DTC Check in Section
1A".
Is there any DTC related to engine speed?
4 Engine speed signal circuit check
1) With ignition switch turned OFF, disconnect P/S control
module connector.
2) Check P/S control module connector for proper
connection.
3) If OK, turn ON ignition switch, measure voltage between
"E52-12" wire terminal of P/S control module connector
and vehicle body ground.
Is voltage 10 – 14 V?
5 1) With ignition switch turned OFF, disconnect ECM
connector.
2) Check for proper connection to the P/S control module
and ECM at each "Engine speed signal circuit" terminal.
3) If connections are OK, check that "Engine speed signal
circuit" is as following.
• Insulation resistance of "Engine speed signal circuit"
wire is infinity between its terminal and other terminals
at ECM and P/S control module connector.
• Wiring resistance of "Engine speed signal circuit"
terminal are less than 1 Ω.
• Insulation resistance of "Engine speed signal circuit"
between its terminal and vehicle body ground is
infinity.
• Circuit voltage between "Engine speed signal circuit"
and ground circuit is 0 – 1 V with ignition switch turned
ON.
Is circuit in good condition?
6 ECM voltage check
1) Connect P/S control module and ECM connectors.
2) Check ECM for engine speed signal and vehicle speed
signal output voltage to P/S control module referring to
"Inspection of ECM and Its Circuits in Section 1A".
Is check result in good condition?
Action
Power Assisted Steering System:
Yes
Go to Step 2.
Go to Step 3.
Go to applicable DTC
diag. flow.
Go to Step 6.
Go to Step 6.
Substitute a known-
good P/S control
module and recheck.
6C-29
No
Go to "EPS System
Check".
Check intermittent
trouble referring to
"Intermittent and Poor
Connection Inspection
in Section 00".
Go to Step 4.
Go to Step 5.
Repair engine speed
signal circuit.
Substitute a known-
good ECM and recheck.