Dodge Ram Truck 1500-2500-3500. Manual — part 1124
P2127-PPS 2 VOLTAGE TOO LOW (CONTINUED)
6.
(F856) APPS NO. 2 5-VOLT SUPPLY CIRCUIT SHORTED TO OTHER CIRCUITS
Measure the resistance between the (F856) APPS No. 2 5-volt supply
circuit at the sensor harness connector and all other circuits in the
ECM harness connector.
Is the resistance greater than 100 k ohms?
Yes
>> Go To 7
No
>> Repair the (F856) APPS No. 2 5-volt supply circuit shorted
to other circuits.
Perform POWERTRAIN VERIFICATION TEST VER - 1
(DIESEL). (Refer to 8 - ELECTRICAL/ELECTRONIC CON-
TROL MODULES/ENGINE CONTROL MODULE - DIAG-
NOSIS AND TESTING)
7.
ECM
Reconnect the ECM harness connectors.
Turn the ignition on.
While monitoring with the scan tool, connect a jumper wire between the (K29) APPS No. 2 signal circuit at the
sensor harness connector and the (F856) APPS No. 2 5-volt supply circuit at the sensor harness connector.
NOTE: With the sensor disconnected it is normal to have a APPS 1 and APPS 2 low voltage DTC set.
Did DTC P2128 set?
Yes
>> Go To 8
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)
9 - 1418
ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL
DR/DH
P2127-PPS 2 VOLTAGE TOO LOW (CONTINUED)
8.
APPS
Reconnect the APPS harness connector.
Monitor the APPS 1 and APPS 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
swing smooth?
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 - 1419
P2128-PPS 2 VOLTAGE TOO HIGH
9 - 1420
ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL
DR/DH
P2128-PPS 2 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
(K400) APPS NO. 1 RETURN CIRCUIT OPEN
(K29) APPS NO. 2 SIGNAL CIRCUIT SHORTED TO (K854) APPS NO. 2 5-VOLT SUPPLY
(K29) 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.
(K400) APPS NO. 2 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 (K400) APPS No. 2 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 (K400) APPS No. 2 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 - 1421
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