Dodge Ram Truck 1500-2500-3500. Manual — part 298
*NO RESPONSE FROM PCM (SCI ONLY) - JTEC (CONTINUED)
3.
SCI CIRCUITS SHORTED TO VOLTAGE
Turn the ignition on.
Measure the voltage of the (D21) SCI Transmit (PCM) circuit.
Measure the voltage of the (D20) SCI Receive (PCM) circuit.
Is the voltage above 1.0 volt for either circuit?
Yes
>> Repair the SCI Circuit that measured above 1.0 volt for a
short to voltage.
Perform POWERTRAIN VERIFICATION TEST - VER 1.
No
>> Go To 4
4.
(D21) SCI TRANSMIT (PCM) CIRCUIT OPEN
Turn the ignition off.
Measure the resistance of the (D21) SCI Transmit (PCM) circuit
between the DLC and the PCM connector.
Is the resistance below 5.0 ohms?
Yes
>> Go To 5
No
>> Repair the (D21) SCI Transmit (PCM) circuit for an open.
Perform POWERTRAIN VERIFICATION TEST - VER 1.
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ELECTRONIC CONTROL MODULES - ELECTRICAL DIAGNOSTICS
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*NO RESPONSE FROM PCM (SCI ONLY) - JTEC (CONTINUED)
5.
(D20) SCI RECEIVE (PCM) CIRCUIT OPEN
Measure the resistance of the (D20) SCI Receive (PCM) circuit
between the DLC and the PCM connector.
Is the resistance below 5.0 ohms?
Yes
>> Go To 6
No
>> Repair the (D20) SCI Receive (PCM) circuit for an open.
Perform POWERTRAIN VERIFICATION TEST - VER 1.
6.
(D21) SCI TRANSMIT (PCM) CIRCUIT SHORTED TO THE (D20) SCI RECEIVE (PCM) CIRCUIT
Measure the resistance between the (D21) SCI Transmit (PCM) and
the (D20) SCI Receive (PCM) circuits.
Is the resistance below 5.0 ohms?
Yes
>> Repair the (D21) SCI Transmit (PCM) circuit for a short to
the (D20) SCI Receive (PCM) circuit.
Perform POWERTRAIN VERIFICATION TEST - VER 1.
No
>> Replace the Powertrain Control Module in accordance with
the service information.
Perform POWERTRAIN VERIFICATION TEST - VER 1.
DR/DH
ELECTRONIC CONTROL MODULES - ELECTRICAL DIAGNOSTICS
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*NO RESPONSE FROM PCM (PCI BUS) - NGC
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ELECTRONIC CONTROL MODULES - ELECTRICAL DIAGNOSTICS
DR/DH
*NO RESPONSE FROM PCM (PCI BUS) - NGC (CONTINUED)
For a complete wiring diagram Refer to Section 8W.
Possible Causes
POWERTRAIN CONTROL MODULE POWER AND GROUND
(D25) PCI BUS CIRCUIT OPEN
POWERTRAIN CONTROL MODULE
Diagnostic Test
1.
ESTABLISH COMMUNICATIONS WITH OTHER PCI BUS MODULES
Turn the ignition on.
NOTE: Ensure there is PCI bus communication with other modules. If not, refer to the PCI Bus Communi-
cation Failure symptom and repair as necessary.
NOTE: As soon as one or more modules communicates with the DRB, answer the question.
With the DRB, attempt to communicate with the ORC.
With the DRB, attempt to communicate with the Instrument Cluster.
Was the DRB able to I/D or communicate with either of the modules?
Yes
>> Go To 2
No
>> Refer to the table of contents and perform the related symptom.
Perform (NGC) POWERTRAIN VERIFICATION TEST - VER 1.
DR/DH
ELECTRONIC CONTROL MODULES - ELECTRICAL DIAGNOSTICS
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