Dodge Ram. Manual — part 69
TEST
ACTION
APPLICABILITY
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?
All
Yes
→ Go To 5
No
→ Repair the SCI circuit(s) for an open.
Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIE-
SEL).
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?
All
Yes
→ Repair the SCI circuit(s) for a short together.
Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIE-
SEL).
No
→ Go To 6
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?
All
Yes
→ Repair as wiring/ connectors necessary.
Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIE-
SEL).
No
→ Replace and program the Engine Control Module in accordance
with the Service Information.
Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIE-
SEL).
273
COMMUNICATION
*NO RESPONSE FROM ECM (SCI ONLY) - DIESEL ONLY —
Continued
Symptom:
*NO RESPONSE FROM FRONT CONTROL MODULE
POSSIBLE CAUSES
ATTEMPT TO COMMUNICATE WITH ANOTHER MODULE
OPEN GROUND CIRCUIT(S)
OPEN FUSED IGNITION SWITCH OUTPUT CIRCUIT
OPEN PCI BUS CIRCUIT
FRONT CONTROL MODULE
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRB, attempt to communicate with the Airbag Control Module.
With the DRB, attempt to communicate with the Controller Antilock Brake (CAB)
module.
With the DRB, attempt to communicate with the Instrument Cluster.
Was the DRB able to I/D or communicate with any of the modules?
All
Yes
→ Go To 2
No
→ Refer to symptom list for problems related to the PCI Bus
Communication Failure.
Perform BODY VERIFICATION TEST - VER 1.
2
Turn the ignition off.
Remove the Front Control Module from the IPM.
Using a 12-volt test light connected to 12-volts, probe each Ground circuit in the IPM
FCM connector.
Is the test light illuminated for each circuit?
All
Yes
→ Go To 3
No
→ Repair the Ground circuit(s) for an open between the IPM
connector and the grounding point. If OK, replace the power
distribution center.
Perform BODY VERIFICATION TEST - VER 1.
3
NOTE: Check IPM fuse #50 for an open before continuing.
Turn the ignition off.
Remove the Front Control Module from the IPM.
Turn the ignition on.
Using a 12-volt test light connected to ground, probe the Fused Ignition Switch
Output circuit in the IPM FCM connector.
Is the test light illuminated?
All
Yes
→ Go To 4
No
→ Check IPM fuse #50 for an open. If OK, replace the power
distribution center.
Perform BODY VERIFICATION TEST - VER 1.
274
COMMUNICATION
TEST
ACTION
APPLICABILITY
4
Note: Ensure there is PCI Bus communication with other modules on the
vehicle before proceeding. If not, refer to the symptom list from the menu
and repair as necessary.
Remove the Front Control Module from the IPM.
Use Scope input cable CH7058, Cable to Probe adapter CH7062, and the red and
black test probes.
Connect the scope input cable to the channel one connector on the DRB. Attach the
red and black leads and the cable to probe adapter to the scope input cable.
With the DRBIII
t select Pep Module Tools.
Select lab scope.
Select Live Data.
Select 12 volt square wave.
Press F2 for Scope.
Press F2 and use the down arrow to set voltage range to 20 volts. Set the probe to x10.
Press F2 again when complete.
Connect the Black lead to the chassis ground. Connect the Red lead to the PCI Bus
circuit in the IPM FCM connector.
Turn the ignition on.
Observe the voltage display on the DRB Lab Scope.
Does the voltage pulse from 0 to approximately 7.5 volts?
All
Yes
→ Replace the Front Control Module in accordance with the service
information.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Repair the PCI Bus circuit for an open. If OK, replace the power
distribution center.
Perform BODY VERIFICATION TEST - VER 1.
275
COMMUNICATION
*NO RESPONSE FROM FRONT CONTROL MODULE —
Continued
Symptom:
*NO RESPONSE FROM HANDS FREE MODULE
POSSIBLE CAUSES
ATTEMPT TO COMMUNICATE WITH THE MIC
GROUND CIRCUIT OPEN
FUSED B(+) CIRCUIT OPEN
FUSED IGNITION SWITCH OUTPUT CIRCUIT OPEN
OPEN PCI BUS CIRCUIT
HANDS FREE MODULE
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t, attempt to communicate with the Instrument Cluster.
Was the DRBIII
t able to I/D or communicate with the Instrument Cluster?
All
Yes
→ Go To 2
No
→ Refer to the symptom list for problems related to no communica-
tion with the Instrument Cluster.
Perform BODY VERIFICATION TEST - VER 1.
2
Turn the ignition off.
Disconnect the Hands Free Module harness connector.
Using a 12-volt test light connected to 12-volts, probe the ground circuit.
Is the test light illuminated?
All
Yes
→ Go To 3
No
→ Repair the ground circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
3
Turn the ignition off.
Disconnect the Hands Free Module harness connector.
Using a 12-volt test light connected to ground, probe the Fused B(+) circuit.
Is the test light illuminated?
All
Yes
→ Go To 4
No
→ Repair the Fused B+ circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
4
Turn the ignition off.
Disconnect the Hands Free Module harness connector.
Turn the ignition on.
Using a 12-volt test light connected to ground, probe the Fused Ignition Switch
Output circuit.
Is the test light illuminated?
All
Yes
→ Go To 5
No
→ Repair the Fused Ignition Switch Output circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
276
COMMUNICATION
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