Suzuki 2006 SX4 Service Manual page 828

6C-26 Power Assisted Steering System:
DTC Troubleshooting
Step
1 Was "EPS System Check" performed?
2 DTC check
1) Check ECM for DTC referring to "DTC Check in Section
1A".
Is there any DTC(s) detected?
3 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
"E11-12" wire terminal of P/S control module connector
and vehicle body ground.
Is voltage 10 – 14 V?
4 ECM voltage check
1) With ignition switch turned OFF, connect P/S control
module and ECM connectors.
2) Check engine speed signal output referring to
"Inspection of ECM and Its Circuits in Section 1A".
Is it in good condition?
5 Engine speed signal circuit check
1) Disconnect ECM connector.
2) Check that engine speed signal circuit is as follows.
• Insulation resistance of wire harness is infinity
between "Engine speed signal circuit" terminal and
other terminal at P/S control module connector.
• Wiring harness resistance of "Engine speed signal
circuit" is less than 1Ω.
• Insulation resistance between "Engine speed signal
circuit" 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 it in good condition?
Action Yes
Go to Step 2.
Go to applicable DTC
diag. flow.
Go to Step 4.
Substitute a known-
good P/S control
module and recheck.
Substitute a known
good ECM and recheck.
No
Go to "EPS System
Check".
Go to Step 3.
Go to Step 5.
Substitute a known
good ECM and recheck.
Repair or replace
defective circuit.