Dodge Ram Truck 1500-2500-3500. Manual — part 1122
P2123-PPS 1 VOLTAGE TOO HIGH
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ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL
DR/DH
P2123-PPS 1 VOLTAGE TOO HIGH (CONTINUED)
For the Engine circuit diagram (Refer to 9 - ENGINE - SCHEMATICS AND DIAGRAMS)
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
While the key is on and during engine operation.
•
Set Condition:
The APPS signal circuit voltage at the ECM goes above 4.24 volts for more than 2 seconds.
Possible Causes
(K167) APPS NO. 1 RETURN CIRCUIT OPEN
(K23) APPS NO. 1 SIGNAL CIRCUIT SHORTED TO (K852) APPS NO. 1 5-VOLT SUPPLY
(K23) APPS SIGNAL CIRCUIT SHORTED TO ANOTHER CIRCUIT
ECM
APPS
INTERMITTENT CONDITION
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING)
Diagnostic Test
1.
(K167) APPS NO. 1 RETURN CIRCUIT OPEN
Turn the ignition off.
Disconnect the APPS harness connector.
Disconnect the ECM harness connectors.
NOTE: Check connectors - Clean/repair as necessary.
Measure the resistance on the (K167) APPS No. 1 return circuit
between the sensor harness connector and the ECM harness connec-
tor.
Is the resistance less than 10 ohms?
Yes
>> Go To 2
No
>> Repair the (K167) APPS No. 1 return circuit open.
Perform POWERTRAIN VERIFICATION TEST VER - 1
(DIESEL). (Refer to 8 - ELECTRICAL/ELECTRONIC CON-
TROL MODULES/ENGINE CONTROL MODULE - DIAG-
NOSIS AND TESTING)
DR/DH
ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL
9 - 1411
P2123-PPS 1 VOLTAGE TOO HIGH (CONTINUED)
2.
(K23) APPS NO. 1 SIGNAL CIRCUIT SHORTED TO (K852) APPS NO. 1 5-VOLT SUPPLY
Measure the resistance between the (K23) APPS No. 1 signal circuit in
the sensor harness connector and the (K852) APPS No. 1 5-volt sup-
ply circuit in the sensor harness connector.
Is the resistance greater than 100 K ohms?
Yes
>> Go To 3
No
>> Repair the (K23) APPS No. 1 signal circuit shorted to the
(K852) 5-volt supply circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 1
(DIESEL). (Refer to 8 - ELECTRICAL/ELECTRONIC CON-
TROL MODULES/ENGINE CONTROL MODULE - DIAG-
NOSIS AND TESTING)
3.
(K23) APPS SIGNAL CIRCUIT SHORTED TO ANOTHER CIRCUIT
Measure the resistance between the APPS No. 1 signal circuit at the
ECM harness connector and all other circuits in the ECM harness con-
nector.
Is the resistance greater than 100 k ohms?
Yes
>> Go To 4
No
>> Repair the (K23) APPS No. 1 signal circuit shorted to
another circuit in the engine harness.
Perform POWERTRAIN VERIFICATION TEST VER - 1
(DIESEL). (Refer to 8 - ELECTRICAL/ELECTRONIC CON-
TROL MODULES/ENGINE CONTROL MODULE - DIAG-
NOSIS AND TESTING)
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ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL
DR/DH
P2123-PPS 1 VOLTAGE TOO HIGH (CONTINUED)
4.
ECM
Reconnect the ECM harness connectors.
Reconnect the APPS harness connector.
While monitoring with the scan tool, disconnect the sensor connector.
Did a APPS No. 1 and APPS No. 2 voltage too low DTC set?
Yes
>> Go To 5
No
>> Replace and program the ECM in accordance with the Service Information.
Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). (Refer to 8 - ELECTRICAL/ELEC-
TRONIC CONTROL MODULES/ENGINE CONTROL MODULE - DIAGNOSIS AND TESTING)
5.
APPS
Reconnect the APPS harness connector.
Monitor the APPS No. 1 and APPS No. 2 voltage with the scan tool while depressing the throttle pedal.
Is the voltage transition shown on the scan tool smooth while depressing the throttle and is the voltage
from APPS 1 twice as much as from APPS2?
Yes
>> Refer to the INTERMITTENT CONDITION Symptom (Diagnostic Procedure). (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING)
No
>> Replace the APPS.
Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). (Refer to 8 - ELECTRICAL/ELEC-
TRONIC CONTROL MODULES/ENGINE CONTROL MODULE - DIAGNOSIS AND TESTING)
DR/DH
ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL
9 - 1413
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