Dodge Ram Truck 1500-2500-3500. Manual — part 1120
P2121-PPS CONFORMANCE ERROR (CONTINUED)
20.
SIGANAL CIRCUIT SHORTED TO SUPPLY CIRCUIT
Measure the resistance between the APPS 2 signal circuit in the sen-
sor connector and the PPS 2 supply circuit in the sensor connector.
Is the resistance greater than 100 K ohms?
Yes
>> Go To 21
No
>> Repair the signal circuit shorted to the supply.
Perform POWERTRAIN VERIFICATION TEST VER - 1
(DIESEL). (Refer to 8 - ELECTRICAL/ELECTRONIC CON-
TROL MODULES/ENGINE CONTROL MODULE - DIAG-
NOSIS AND TESTING)
21.
RETURN CIRCUIT SHORTED TO OTHER CIRCUITS
Measure the resistance between the APPS 2 return circuit at the ECM
connector and all other circuits in the ECM connector.
Yes
>> Go To 22
No
>> Repair the return 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)
9 - 1402
ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL
DR/DH
P2121-PPS CONFORMANCE ERROR (CONTINUED)
22.
ECM
Reconnect the ECM connectors.
Reconnect the APPS connector.
Turn Ignition on, engine off.
While monitoring with the scan tool, disconnect the sensor connector.
Did a APPS 1 and APPS 2 voltage too low DTC set?
Yes
>> Go To 23
No
>> Replace the ECM.
Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). (Refer to 8 - ELECTRICAL/ELEC-
TRONIC CONTROL MODULES/ENGINE CONTROL MODULE - DIAGNOSIS AND TESTING)
23.
APPS
Reconnect the APPS connector.
Monitor the APPS 1 and APPS 2 voltage with the scan tool while depressing the acceralator pedal.
Is the voltage transition shown on the scan tool smooth while depressing the acceraaltor and is the volt-
age from APPS 1 twice as much as the voltage from APPS 2?
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 - 1403
P2122-PPS 1 VOLTAGE TOO LOW
9 - 1404
ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL
DR/DH
P2122-PPS 1 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
(K23) APPS NO. 1 SIGNAL CIRCUIT OPEN
(F855) APPS NO. 1 5-VOLT SUPPLY OPEN
(K23) APPS NO. 1 SIGNAL CIRCUIT SHORTED TO GROUND
(K23) APPS NO. 1 SIGNAL CIRCUIT SHORTED TO OTHER CIRCUITS
(F855) APPS NO. 1 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND
(F855) APPS NO. 1 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.
(K23) APPS NO. 1 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 (K23) APPS No. 1 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 (K23) APPS No. 1 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 - 1405
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