Suzuki 2009 LT-A750XK9, Service Manual

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6C-9 Power Assisted Steering System:
Diagnostic Information and Procedures
EPS Troubleshooting (LT-A750XP/ZK9)
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The EPS is equipped with a self-diagnosis function. The
detected malfunction is stored as a diagnostic trouble
code which causes the EPS indicator light to light up or
flash in set patterns to indicate the malfunction.
Diagnostic trouble codes saved in the memory remain
stored even through the ignition switch is turned OFF
and they cannot be deleted without performing the DTC
erasing procedure. In order to repair the EPS correctly,
ask the customer for the exact circumstances under
which the malfunction occurred, then check the EPS
indicator light and the output diagnostic trouble codes.
Explain to the customer that depending on how the
vehicle is operated, the EPS indicator light may light up
even though the EPS is operating correctly.
Troubleshooting Procedure
Troubleshooting should be proceed as follows. If the
order is performed incorrectly or any part is omitted, an
error in misdiagnosis may result.
1) Gather information from the customer.
2) Perform the pre-diagnosis inspection. Refer to “Pre-
diagnosis Inspection (LT-A750XP/ZK9) (Page 6C-
10)”.
3) Inspect the EPS indicator light. Refer to “EPS
System Check (LT-A750XP/ZK9) (Page 6C-12)”.
4) Output the DTCs stored in the EPS control unit.
Refer to “DTC (Diagnostic Trouble Code) Output (LT-
A750XP/ZK9) (Page 6C-19)”.
5) Perform appropriate troubleshooting procedures
according to the DTCs output. Refer to “DTC Table
(LT-A750XP/ZK9) (Page 6C-25)”.
If troubleshooting procedures cannot be performed,
try to determine the cause of the malfunction
according to the information gathered in 1) through
4) and inspect the wiring. Refer to “EPS Wiring
Diagram (LT-A750XP/ZK9) (Page 6C-6)” and “EPS
Control Unit Diagram (LT-A750XP/ZK9) (Page 6C-
7)”.
CAUTION
!
Each time a resistance is measured, the
ignition switch should be set to OFF.
6) Inspect the EPS components. Refer to “EPS Motor
Inspection (LT-A750XP/ZK9) (Page 6C-53)”.
7) Delete the DTCs and check the power steering
operation. Refer to “DTC (Diagnostic Trouble Code)
Deleting (LT-A750XP/ZK9) (Page 6C-21)”.
Basic Troubleshooting Diagram
1) Gather information from the customer.
2) Perform the pre-diagnosis inspection.
3) Inspect the EPS indicator light.
6) Inspect the EPS components.
4) Output the DTCs stored in the EPS control unit.
5) Perform appropriate troubleshooting proce-
dures according to the DTCs output.
If troubleshooting procedures cannot be per-
formed, try to determine the cause of the mal-
function according to the information gathered
in 1) through 4) and inspect the wiring.
7) Delete the DTCs and check the steering operation.
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