Dodge Ram Truck 1500-2500-3500. Manual — part 1123
P2127-PPS 2 VOLTAGE TOO LOW
9 - 1414
ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL
DR/DH
P2127-PPS 2 VOLTAGE TOO 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:
While the key is on and during engine operation.
•
Set Condition:
The APPS circuit voltage at the ECM goes below 0.13 volt for more than 2 seconds.
Possible Causes
APPS
ECM
(K29) APPS NO. 2 SIGNAL CIRCUIT OPEN
(F856) APPS NO. 2 5-VOLT SUPPLY OPEN
(K29) APPS NO. 2 SIGNAL CIRCUIT SHORTED TO GROUND
(K29) APPS NO. 2 SIGNAL CIRCUIT SHORTED TO OTHER CIRCUITS
(F856) APPS NO. 2 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND
(F856) APPS NO. 2 5-VOLT SUPPLY CIRCUIT SHORTED TO OTHER CIRCUITS
INTERMITTENT CONDITION
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING)
Diagnostic Test
1.
(K29) APPS NO. 2 SIGNAL CIRCUIT OPEN
Turn the ignition off.
Disconnect the ECM harness connectors.
Disconnect the APPS harness connector.
NOTE: Check connectors - Clean/repair as necessary.
Measure the resistance of the (K29) APPS No. 2 signal circuit
between the APPS sensor harness connector and the ECM harness
connector.
Is the resistance less than 10 ohms?
Yes
>> Go To 2
No
>> Repair the (K29) APPS No. 2 signal 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 - 1415
P2127-PPS 2 VOLTAGE TOO LOW (CONTINUED)
2.
(F856) APPS NO. 2 5-VOLT SUPPLY OPEN
Measure the resistance of the (F856) APPS No. 2 5-volt supply circuit
between the APPS sensor harness connector and the ECM harness
connector.
Is the resistance less than 10 ohms?
Yes
>> Go To 3
No
>> Repair the (F856) APPS No. 2 5-volt supply open.
Perform POWERTRAIN VERIFICATION TEST VER - 1
(DIESEL). (Refer to 8 - ELECTRICAL/ELECTRONIC CON-
TROL MODULES/ENGINE CONTROL MODULE - DIAG-
NOSIS AND TESTING)
3.
(K29) APPS NO. 2 SIGNAL CIRCUIT SHORTED TO GROUND
Measure the resistance between the (K29) APPS No. 2 signal circuit
at the sensor harness connector and battery negative.
Is the resistance greater than 100 k ohms?
Yes
>> Go To 4
No
>> Repair the (K29) APPS No. 2 signal circuit shorted to
ground.
Perform POWERTRAIN VERIFICATION TEST VER - 1
(DIESEL). (Refer to 8 - ELECTRICAL/ELECTRONIC CON-
TROL MODULES/ENGINE CONTROL MODULE - DIAG-
NOSIS AND TESTING)
9 - 1416
ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL
DR/DH
P2127-PPS 2 VOLTAGE TOO LOW (CONTINUED)
4.
(K29) APPS NO. 2 SIGNAL CIRCUIT SHORTED TO OTHER CIRCUITS
Measure the resistance between the (K29) APPS No. 2 signal circuit
at the ECM harness connector and all other circuits in the ECM har-
ness connectors.
Is the resistance greater than 100 k ohms?
Yes
>> Go To 5
No
>> Repair the (K29) APPS No. 2 signal 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)
5.
(F856) APPS NO. 2 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND
Measure the resistance between the (F856) APPS No. 2 5-volt supply
circuit at the sensor harness connector and battery negative.
Is the resistance greater than 100 k ohms?
Yes
>> Go To 6
No
>> Repair the (F856) APPS No. 2 5-volt supply circuit shorted
to ground.
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 - 1417
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