Dodge Ram. Manual — part 68
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.
Disconnect the CAB C1 harness connector.
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. Press F2 again
when complete.
Connect the Black lead to the chassis ground. Connect the Red lead to the PCI Bus
circuit in the CAB 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
→ Go To 5
No
→ Repair the PCI Bus circuit for an open.
Perform ABS VERIFICATION TEST - VER 1.
5
If there are no possible causes remaining, view repair.
All
Repair
Replace the Controller Antilock Brake in accordance with the
Service Information.
Perform ABS VERIFICATION TEST - VER 1.
269
COMMUNICATION
*NO RESPONSE FROM CONTROLLER ANTILOCK BRAKE —
Continued
Symptom:
*NO RESPONSE FROM ECM (PCI BUS) - DIESEL ONLY
POSSIBLE CAUSES
ECM PCI NO RESPONSE
PCI BUS CIRCUIT OPEN
ENGINE CONTROL MODULE
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
NOTE: As soon as one or more module communicates with the DRB, answer
the question.
With the DRBIII
t, enter Anti-Lock Brakes.
With the DRBIII
t, enter Body then Electro/Mechanical Cluster (MIC).
With the DRBIII
t, enter Passive Restraints then Airbag.
Were you able to establish communications with any of the modules?
All
Yes
→ Go To 2
No
→ Refer to symptom PCI Bus Communication Failure in the Com-
munications category.
Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIE-
SEL).
270
COMMUNICATION
TEST
ACTION
APPLICABILITY
2
With the DRBIII
t read ECM Diagnostic Trouble Codes. This is to ensure power and
grounds to the ECM are operational.
NOTE: If the DRBIII
t will not read ECM DTC’s, follow the NO RESPONSE
TO ECM (SCI only) symptom path.
NOTE: If the vehicle will not start and the DRBIII
t displays a no response
message, refer to the appropriate symptom in the powertrain diagnostic
procedures.
Turn the ignition off.
Disconnect the ECM harness connectors.
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 DRBIII
t. 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 Probe to x10.
Press F2 again when complete.
Connect the Black lead to the ECM ground. Connect the Red lead to the PCI Bus
circuit in the ECM connector.
Turn the ignition on.
Observe the voltage display on the DRBIII
t Lab Scope.
Does the voltage pulse from 0 to approximately 7.5 volts?
All
Yes
→ Replace and program the Engine Control Module in accordance
with the Service Information.
Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIE-
SEL).
No
→ Repair the PCI Bus circuit for an open.
Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIE-
SEL).
271
COMMUNICATION
*NO RESPONSE FROM ECM (PCI BUS) - DIESEL ONLY —
Continued
Symptom:
*NO RESPONSE FROM ECM (SCI ONLY) - DIESEL ONLY
POSSIBLE CAUSES
INSPECT WIRING HARNESS AND CONNECTORS
CHECK ECM POWERS AND GROUNDS
SCI CIRCUIT(S) SHORTED TO GROUND
SCI CIRCUIT(S) SHORTED TO VOLTAGE
SCI CIRCUIT(S) OPEN
SCI CIRCUIT(S) SHORTED TOGETHER
ENGINE CONTROL MODULE
TEST
ACTION
APPLICABILITY
1
Perform the symptom Checking ECM Power and Ground Circuits in the Driveability
category.
Did the vehicle pass this test?
All
Yes
→ Go To 2
No
→ Repair as necessary.
Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIE-
SEL).
2
Turn the ignition off.
Disconnect the ECM harness connectors.
Disconnect the DRB from the DLC.
Measure the resistance between ground and the SCI Transmit circuit.
Measure the resistance between ground and the SCI Receive circuit.
Is the resistance below 10.0 ohms for both measurements?
All
Yes
→ Repair the SCI circuit(s) for a short to ground.
Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIE-
SEL).
No
→ Go To 3
3
Turn the ignition off.
Disconnect the DRB from the DLC.
Disconnect the ECM harness connectors.
Turn the ignition on.
Measure the voltage of the SCI Transmit circuit at the DLC.
Measure the voltage of the SCI Receive circuit at the DLC.
Is the voltage above 1.0 volt for either measurement?
All
Yes
→ Repair the SCI circuit(s) for a short to voltage.
Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIE-
SEL).
No
→ Go To 4
272
COMMUNICATION
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