Chrysler Crossfire. Manual — part 490
(P0123) APPS SIGNAL 1 CIRCUIT HIGH
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ENGINE - ELECTRICAL DIAGNOSTICS
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(P0123) APPS SIGNAL 1 CIRCUIT HIGH (CONTINUED)
When Monitored and Set Condition
•
When Monitored: With the ignition on and no other Accelerator Pedal Position (APP) Sensor 1 DTCs present.
•
Set Condition: When APP Sensor Signal 1 voltage is too high. Engine will only idle if the brake pedal is
pressed or has failed. Acceleration rate and engine output are limited.
POSSIBLE CAUSES
ACCELERATOR PEDAL POSITION SENSOR SIGNAL 1 CIRCUIT SHORT TO VOLTAGE
ACCELERATOR PEDAL POSITION SENSOR SIGNAL 1 SHORT TO APP SENSOR 5-VOLT SUPPLY CIRCUIT
SENSOR GROUND CIRCUIT OPEN
ACCELERATOR PEDAL POSITION SENSOR
POWERTRAIN CONTROL MODULE
For a complete Powertrain Control Module Circuit Diagram, (Refer to 9 - ENGINE - SCHEMATICS AND DIA-
GRAMS).
Diagnostic Test
1.
PRE-DIAGNOSTIC CHECK OUT
Note: Always perform diagnostics with a fully charged battery.
Note: Check connectors — Clean/repair as necessary. Poor pin to
terminal connections can set DTCs.
Note: Check for applicable TSBs related to the problem.
Turn the ignition on.
With the DRB III
T
, read PCM DTCs.
Using the wiring diagram/schematic as a guide, inspect the wiring and
connectors. Repair as necessary.
Perform this procedure prior to symptom diagnosis.
Continue
Go To 2
2.
CHECK THE APP SENSOR SIGNAL 1 VOLTAGE WITH THE DRB III
T
Turn the ignition on.
With the DRB III
T
, read the APP 1 voltage.
Is the voltage above 3.5 volts?
Yes
>> Go To 3
No
>> Go To 10
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ENGINE - ELECTRICAL DIAGNOSTICS
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(P0123) APPS SIGNAL 1 CIRCUIT HIGH (CONTINUED)
3.
MEASURE THE APP SENSOR SIGNAL 1 VOLTAGE
Turn the ignition off.
Disconnect the APP Sensor harness connector.
Note: Check connectors — Clean/repair as necessary.
Turn the ignition on.
Measure the voltage of the APP Sensor Signal 1 circuit at the APP
Sensor harness connector.
Is the voltage below 0.05 volt?
Yes
>> Go To 4
No
>> Go To 7
4.
MEASURE THE RESISTANCE BETWEEN GROUND AND THE SENSOR GROUND CIRCUIT
Turn the ignition off.
Measure the resistance between ground and the Sensor Ground cir-
cuit at APP Sensor harness connector cavity 6.
Is the resistance below 5.0 ohms?
Yes
>> Go To 5
No
>> Go To 6
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ENGINE - ELECTRICAL DIAGNOSTICS
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(P0123) APPS SIGNAL 1 CIRCUIT HIGH (CONTINUED)
5.
CHECK THE PCM
Turn the ignition on.
Connect a jumper wire between the APP Sensor 5-Volt Supply circuit
and the APP Sensor Signal 1 circuit at the APP Sensor harness con-
nector.
With the DRB III
T
, read the APP 1 voltage.
Note: Remove the jumper wire after this step has been com-
pleted.
Is the voltage above 4.7 volts?
Yes
>> Replace the Accelerator Pedal Position Sensor. (Refer to
14 - FUEL SYSTEM/FUEL INJECTION/ACCELERATOR
PEDAL - REMOVAL).
Perform POWERTRAIN VERIFICATION TEST - VER 2.
No
>> Go To 9
6.
SENSOR GROUND CIRCUIT OPEN
With the ignition off.
Measure the resistance of the Sensor Ground circuit from APP Sensor
harness connector cavity 6 to PCM C4 harness connector cavity 6.
Is the resistance below 5.0 ohms?
Yes
>> Go To 9
No
>> Repair the Sensor Ground circuit for an open.
Perform POWERTRAIN VERIFICATION TEST - VER 2.
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ENGINE - ELECTRICAL DIAGNOSTICS
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