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Suzuki SX4 Service Manual page 959

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DTC Detecting Condition and Trouble Area
DTC detecting condition
Engine speed signal is less than 220 rpm for more than
0.8 seconds.
or
Engine speed signal is less than 220 rpm for more than 20
seconds continuously even though vehicle speed signal is
more than 50 km/h.
(1 driving cycle detection logic)
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
Power Assisted Steering System:
Trouble area
• Engine speed signal circuit
• ECM
• P/S control module
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.
6C-25
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.

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