Dodge Durango (HB). Manual — part 971
P2123-ACCELERATOR PEDAL POSITION SENSOR 1 CIRCUIT HIGH (CONTINUED)
5.
(K23) APPS NO.1 SIGNAL CIRCUIT SHORTED TO THE (F856) 5-VOLT SUPPLY CIRCUIT
Measure the resistance between the (K23) APP Sensor No.1 Signal
circuit and the (F856) 5-volt Supply circuit in the APP Sensor harness
connector.
Is the resistance below 100 ohms?
Yes
>> Repair the short between the (K23) APP Sensor No.1 Sig-
nal circuit and the (F856) 5-volt Supply circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 6
6.
(K4) APP SENSOR NO.1 RETURN CIRCUIT OPEN
CAUTION: Do not probe the PCM harness connectors. Probing
the PCM harness connectors will damage the PCM terminals
resulting in poor terminal to pin connection. Install Miller Special
Tool #8815 to perform diagnosis.
Measure the resistance of the (K4) APP Sensor No.1 Return circuit
from the APP Sensor harness connector to the appropriate terminal of
special tool #8815.
Is the resistance below 5.0 ohms?
Yes
>> Go To 7
No
>> Repair the open in the (K4) APP Sensor No.1 Return cir-
cuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
HB
ENGINE ELECTRICAL DIAGNOSTICS
9 - 883
P2123-ACCELERATOR PEDAL POSITION SENSOR 1 CIRCUIT HIGH (CONTINUED)
7.
PCM
NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal
push out. Repair as necessary.
Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and
Ground circuits.
Were there any problems found?
Yes
>> Repair as necessary.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Replace and program the Powertrain Control Module per Service Information.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
8.
APP SENSOR NO.1 SWEEP
Ignition on, engine not running.
With a scan tool, monitor the Accelerator Pedal Position Sensor voltage.
Slowly press the Accelerator Pedal down.
Does voltage start at approximately 0.45 of a volt and go above 4.6 volts with a smooth transition?
Yes
>> Refer to the INTERMITTENT CONDITION Diagnostic Procedure.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Replace the APP Sensor Assembly per Service Information. After installation is complete, use a scan
tool and select the ETC RELEARN function to relearn the APPS values.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
9 - 884
ENGINE ELECTRICAL DIAGNOSTICS
HB
P2127-ACCELERATOR PEDAL POSITION SENSOR 2 CIRCUIT LOW
HB
ENGINE ELECTRICAL DIAGNOSTICS
9 - 885
P2127-ACCELERATOR PEDAL POSITION SENSOR 2 CIRCUIT LOW (CONTINUED)
For the Engine circuit diagram (Refer to 9 - ENGINE - SCHEMATICS AND DIAGRAMS).
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
With the ignition on and no other APPS No.2 DTCs present.
•
Set Condition:
When the APP Sensor No.2 voltage is too low. Engine will only idle if the Brake pedal is Pressed or has failed.
Acceleration rate and Engine output are limited. One trip fault and the code will set within 5 seconds. ETC light
is flashing.
Possible Causes
(F856) 5-VOLT SUPPLY CIRCUIT OPEN
(F856) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND
(K29) APP SENSOR NO.2 SIGNAL CIRCUIT OPEN
(K29) APP SENSOR NO.2 SIGNAL CIRCUIT SHORTED TO GROUND
(K29) APP SENSOR NO.2 SIGNAL CIRCUIT SHORTED TO THE (K4) APP SENSOR NO.1 RETURN CIRCUIT
(K29) APP SENSOR NO.2 SIGNAL CIRCUIT SHORTED TO THE (K400) APP SENSOR NO.2 RETURN CIRCUIT
APP SENSOR
PCM
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING).
Diagnostic Test
1.
APP SENSOR BELOW 0.25 OF A VOLT
Ignition on, engine not running.
With a scan tool, read the APP Sensor No.1 voltage.
NOTE: Sensor No. 2 is pulled low by the PCM as part of its system testing. This test happens a couple of
times a second. So you can expect to see voltages close to zero occasionally with a normal sensor.
Is the voltage consistently below 0.25 of a volt?
Yes
>> Go To 2
No
>> Go To 11
9 - 886
ENGINE ELECTRICAL DIAGNOSTICS
HB
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