Dtc P2127: Pedal Position Sensor (Sub) Circuit Low Input - Suzuki SX4 Service Manual

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Step
6
Wire harness check
1) Disconnect connectors from ECM with ignition switch
turned OFF.
2) Check for proper connection of ECM connector at "E01-
35", "E01-37" and "E01-34" terminals.
3) If OK, measure resistance between "GRN" wire terminal
and each "BRN", "RED" wire terminals of APP sensor
assembly connector.
Is each resistance infinity?
7
Wire harness check
1) Turn ON ignition switch.
2) Measure voltage between "E01-37" terminal of ECM
connector and engine ground.
Is voltage 0 V?
8
Ground circuit check
1) Connect connectors to ECM with ignition switch turned
OFF.
2) Measure resistance between "BLU" wire terminal of APP
sensor assembly connector and vehicle body ground.
Is resistance below 5
9
Ground circuit check
1) Remove ECM from its bracket with ECM connectors
connected.
2) Check for proper connection of ECM connector at "E01-
52" terminal.
3) If OK, measure resistance between "E01-52" terminal of
ECM connector and engine ground.
Is resistance below 5
10 APP sensor assembly check
1) Check APP sensor (main) referring to "Accelerator Pedal
Position (APP) Sensor Assembly Inspection in Section
1C".
Is output voltage within specified value?

DTC P2127: Pedal Position Sensor (Sub) Circuit Low Input

Wiring Diagram
Refer to "DTC P2122: Pedal Position Sensor (Main) Circuit Low Input".
DTC Detecting Condition and Trouble Area
DTC detecting condition
Output voltage of APP sensor (sub) is lower than specified value.
(1 driving detection logic)
Action
?
?
Engine General Information and Diagnosis:
Yes
Go to Step 7.
Go to Step 8.
Go to Step 10.
"BLU" wire is open or
high resistance circuit.
Substitute a known-
good ECM and recheck.
• APP sensor (sub) circuit
• APP sensor assembly
• ECM
• Incorrect mounting of APP sensor assembly
1A-155
No
"GRN" wire is shorted to
"BRN" wire and/or
"RED" wire.
"GRN" wire is shorted to
power circuit.
Go to Step 9.
Faulty ECM ground
circuit. If circuit is OK,
substitute a known-
good ECM and recheck.
Replace APP sensor
assembly.
S7RW0A1104066
Trouble area

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