Dodge Ram Truck 1500-2500-3500. Manual — part 291
*NO RESPONSE FROM ENGINE CONTROL MODULE (SCI ONLY) - DIESEL (CONTINUED)
3.
SCI CIRCUITS SHORTED TO VOLTAGE
Turn the ignition on.
Measure the voltage of the (D21) SCI Transmit circuit.
Measure the voltage of the (D20) SCI Receive 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
(DIESEL).
No
>> Go To 4
4.
(D21) SCI TRANSMIT CIRCUIT OPEN
Turn the ignition off.
Measure the resistance of the (D21) SCI Transmit circuit between the
ECM harness connector and the DLC.
Is the resistance below 5.0 ohms?
Yes
>> Go To 5
No
>> Repair the (D21) SCI Transmit circuit for an open.
Perform POWERTRAIN VERIFICATION TEST - VER 1
(DIESEL).
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ELECTRONIC CONTROL MODULES - ELECTRICAL DIAGNOSTICS
DR/DH
*NO RESPONSE FROM ENGINE CONTROL MODULE (SCI ONLY) - DIESEL (CONTINUED)
5.
(D20) SCI RECEIVE CIRCUIT OPEN
Measure the resistance of the (D20) SCI Receive circuit between the
ECM harness connector and the DLC.
Is the resistance below 5.0 ohms?
Yes
>> Go To 6
No
>> Repair the (D20) SCI Receive circuit for an open.
Perform POWERTRAIN VERIFICATION TEST - VER 1
(DIESEL).
6.
(D21) SCI TRANSMIT CIRCUIT SHORTED TO THE (D20) SCI RECEIVE CIRCUIT
Measure the resistance between the (D21) SCI Transmit and the
(D20) SCI Receive circuits.
Is the resistance below 5.0 ohms?
Yes
>> Repair the (D21) SCI Transmit circuit for a short to the
(D20) SCI Receive circuit.
Perform POWERTRAIN VERIFICATION TEST - VER 1
(DIESEL).
No
>> Replace the Engine Control Module in accordance with the
service information.
Perform POWERTRAIN VERIFICATION TEST - VER 1
(DIESEL).
DR/DH
ELECTRONIC CONTROL MODULES - ELECTRICAL DIAGNOSTICS
8E - 37
*NO RESPONSE FROM FRONT CONTROL MODULE
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ELECTRONIC CONTROL MODULES - ELECTRICAL DIAGNOSTICS
DR/DH
*NO RESPONSE FROM FRONT CONTROL MODULE (CONTINUED)
For a complete wiring diagram Refer to Section 8W.
Possible Causes
(Z117) (Z118) GROUND CIRCUIT OPEN
FUSED IGNITION SWITCH OUTPUT CIRCUIT OPEN
(D25) PCI BUS CIRCUIT OPEN
FRONT CONTROL MODULE
Diagnostic Test
1.
ESTABLISH COMMUNICATIONS WITH OTHER PCI BUS MODULES
Turn the ignition on.
NOTE: Check all fuses before beginning.
NOTE: As soon as one or more modules communicates with the DRB, answer the question.
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.
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 BODY VERIFICATION TEST - VER 1. (Refer to BODY VERIFICATION TEST - VER 1.)
2.
(Z117) (Z118) GROUND CIRCUIT OPEN
Turn the ignition off.
Remove the Front Control Module from the IPM.
Using a 12-volt test light connected to 12-volts, probe each (Z117) and
(Z118) ground circuits.
Is the test light illuminated for each circuit?
Yes
>> Go To 3
No
>> Repair the (Z117) or (Z118) Ground circuit for an open
between the IPM connector and the grounding point. If
OK, replace the power distribution center in accordance
with the service information.
Perform BODY VERIFICATION TEST - VER 1. (Refer to
BODY VERIFICATION TEST - VER 1.)
DR/DH
ELECTRONIC CONTROL MODULES - ELECTRICAL DIAGNOSTICS
8E - 39
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