Dtc P0123: Throttle Position Sensor (Main) Circuit High - Suzuki SX4 Service Manual

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Step
5
Wire harness check
1) Disconnect connectors from ECM with ignition switch
turned OFF.
2) Measure resistance between "C01-43" terminal of ECM
connector and engine ground.
Is resistance infinity?
6
Wire harness check
1) Measure voltage between "GRN" wire terminal of electric
throttle body assembly connector and engine ground
with ignition switch turned ON.
Is voltage 4 – 6 V?
7
Wire harness check
1) Disconnect connectors from ECM with ignition switch
turned OFF.
2) Check for proper connection of ECM connector at "C01-
54" and "C01-42" terminals.
3) If OK, measure resistance between "GRN" and "BLK"
wire terminals of electric throttle body assembly
connector.
Is resistance infinity?
8
Wire harness check
1) Measure resistance between "GRN" wire terminal of
electric throttle body assembly connector and engine
ground with ignition switch turned OFF.
Is resistance infinity?
9
Electric throttle body assembly check
1) Check throttle pedal position sensor referring to "Throttle
Position Sensor Performance Check" under "Electric
Throttle Body Assembly On-Vehicle Inspection in
Section 1C".
Is output voltage within specified value?

DTC P0123: Throttle Position Sensor (Main) Circuit High

Wiring Diagram
Refer to "DTC P0122: Throttle Position Sensor (Main) Circuit Low".
DTC Detecting Condition and Trouble Area
Output voltage of throttle position sensor (main) is more than specified value
for specified time.
(1 driving detection logic)
NOTE
When DTC P0123 and P0223 are indicated together, it is possible that "RED" wire shorted to power
circuit and/or "BLK" wire open.
Action
DTC detecting condition
Engine General Information and Diagnosis:
Yes
Substitute a known-
good ECM and recheck.
Go to Step 9.
Go to Step 8.
Substitute a known-
good ECM and recheck.
Substitute a known-
good ECM and recheck.
• Throttle position sensor (main) circuit
• Electric throttle body assembly
• ECM
1A-89
No
"RED" wire is shorted to
ground circuit.
Go to Step 7.
"GRN" wire is shorted to
"BLK" wire.
"GRN" wire is shorted to
ground circuit.
Replace electric throttle
body assembly.
S7RW0A1104032
Trouble area

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