Dodge Ram 2004 Service Manual page 287

*NO RESPONSE FROM ECM (SCI ONLY) - DIESEL ONLY —
TEST
4 Turn the ignition off.
Disconnect the ECM harness connectors.
Disconnect the DRB from the DLC.
Measure the resistance of the SCI Transmit circuit between the ECM harness
connector and the DLC.
Measure the resistance of the SCI Receive circuit between the ECM harness
connector and the DLC.
Is the resistance below 10.0 ohms for each measurement?
Yes → Go To 5
→ Repair the SCI circuit(s) for an open.
No
5 Turn the ignition off.
Disconnect the ECM harness connectors.
Disconnect the DRB from the DLC.
Measure the resistance between the SCI Transmit and SCI Receive circuits at the
DLC.
Is the resistance below 10.0 ohms?
Yes → Repair the SCI circuit(s) for a short together.
→ Go To 6
No
6 Turn the ignition off.
Using the Service Information inspect the SCI Transmit and SCI Receive circuits
between the DLC and ECM.
Check the wiring and connectors for damage, corrosion or other problems that may
cause circuit interruption.
Are there any problems evident?
Yes → Repair as wiring/ connectors necessary.
→ Replace and program the Engine Control Module in accordance
No
ACTION
Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIE-
SEL).
Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIE-
SEL).
Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIE-
SEL).
with the Service Information.
Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIE-
SEL).
273
COMMUNICATION
Continued
APPLICABILITY
All
All
All