Dodge Ram Truck 1500-2500-3500. Manual — part 1117
P1652-J1850 SHORT TO GROUND (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 ignition is on.
•
Set Condition:
The ECM detects a short to ground on the J1850.
Possible Causes
ECM
(D25) J1850 SHORTED
COMMUNICATION
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING)
Diagnostic Test
1.
ECM
Turn the ignition off.
Disconnect the ECM harness connectors.
NOTE: Check connectors - Clean/repair as necessary.
Measure the resistance between the (D25) J1850 circuit in the ECM
harness connector and battery negative.
Is the resistance less than 10 Ohms?
Yes
>> Go To 2
No
>> Replace the ECM.
Perform POWERTRAIN VERIFICATION TEST VER - 1
(DIESEL). (Refer to 8 - ELECTRICAL/ELECTRONIC CON-
TROL MODULES/ENGINE CONTROL MODULE - DIAG-
NOSIS AND TESTING)
9 - 1390
ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL
DR/DH
P1652-J1850 SHORT TO GROUND (CONTINUED)
2.
(D25) J1850 SHORTED
Measure the resistance between the (D25) J1850 circuit and all other
circuits in both ECM connectors.
Is the resistance greater than 100k ohms?
Yes
>> Refer to the Body Diagnostic book Communications sec-
tion.
No
>> Repair (D25) J1850 shorted to another circuit.
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 - 1391
P2121-PPS CONFORMANCE ERROR
9 - 1392
ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL
DR/DH
P2121-PPS CONFORMANCE ERROR (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 engine is running
•
Set Condition:
The ECM detected a conformance error between PPS 1 and PPS 2
Possible Causes
OTHER DTC’S
WIRING HARNESS OR CONNECTOR DAMAGED
APPS
INTERMITTENT CONDITION
ECM
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING)
Diagnostic Test
1.
OTHER DTC’S PRESENT
Using the scan tool, check for any additional APPS fault codes
Do you have any additiona APPS faults?
Yes
>> troubleshoot other DTC’s first, Go To 2
No
>> Go To 12
2.
APPS HARNESS
Verify that the APPS is connected.
Inspect the harness and the APPS connector.
Are any pins damaged?
Yes
>> Repair or replace the harness.
No
>> Go To 3
3.
APPS
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 acceralator pedal and is the
voltage from APPS 1 twice as much as the voltage from APPS 2?
Yes
>> Go To 4
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 - 1393
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