Dodge Viper SRT-10 (ZB). Manual — part 402
7.0
DIAGNOSTIC INFORMATION AND
PROCEDURES
15
Symptom:
*NO RESPONSE FROM PCM (PCI BUS)
POSSIBLE CAUSES
PCM PCI NO RESPONSE
PCI BUS CIRCUIT OPEN
POWERTRAIN 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 Body then Body Computer.
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.
2
With the DRBIII
t read PCM Diagnostic Trouble Codes. This is to ensure power and
grounds to the PCM are operational.
NOTE: If the DRBIII
t will not read PCM DTC’s, follow the NO RESPONSE
TO PCM (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 PCM C3 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 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 PCM ground. Connect the Red lead to the PCI Bus
circuit in the PCM 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 Powertrain Control Module in accor-
dance with the Service Information.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
No
→ Repair the PCI Bus circuit for an open.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
16
COMMUNICATION
Symptom:
*NO RESPONSE FROM PCM (SCI ONLY)
POSSIBLE CAUSES
CHECK PCM POWERS AND GROUNDS
SCI TRANSMIT CIRCUIT SHORTED TO VOLTAGE
TIRE PRESSURE MONITOR MODULE
SCI RECEIVE CIRCUIT SHORTED TO VOLTAGE
SCI CIRCUITS SHORTED TOGETHER
SCI TRANSMIT CIRCUIT SHORTED TO GROUND
SCI RECEIVE CIRCUIT SHORTED TO GROUND
SCI RECEIVE CIRCUIT OPEN
SCI TRANSMIT CIRCUIT OPEN
POWERTRAIN CONTROL MODULE
TEST
ACTION
APPLICABILITY
1
Perform the symptom Checking PCM Power and Ground Circuits in the Driveability
category.
NOTE: With the DRBIII
t in the generic scan tool mode, attempt to commu-
nicate with the PCM.
NOTE: If the DRBIII
t can communicate with the PCM in the generic scan
tool mode, it may not be necessary to perform this step.
Did the vehicle pass this test?
All
Yes
→ Go To 2
No
→ Repair as necessary.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
2
Turn the ignition off.
Disconnect the PCM C3 harness connector.
Disconnect the DRBIII
t from the DLC.
Measure the resistance between ground and the SCI Transmit circuit.
Is the resistance below 5.0 ohms?
All
Yes
→ Go To 3
No
→ Go To 4
3
Turn the ignition off.
Disconnect the Tire Pressure Monitor Module harness connector (if equipped).
NOTE: If vehicle is not equipped with a Tire Pressure Monitor Module
answer yes to the question.
Measure the resistance between ground and the SCI Transmit circuit.
Is the resistance below 5.0 ohms?
All
Yes
→ Repair the SCI Transmit circuit for a short to ground.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
No
→ Replace the Tire Pressure Monitor Module in accordance with the
service information.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
17
COMMUNICATION
TEST
ACTION
APPLICABILITY
4
Turn the ignition off.
Disconnect the DRBIII
t from the DLC.
Disconnect the PCM harness connectors.
Turn the ignition on.
Disconnect the Low Tire Pressure Warning Module harness connector (if equipped).
Measure the voltage of the SCI Transmit circuit at the DLC.
Is the voltage above 1.0 volt?
All
Yes
→ Repair the SCI Transmit circuit for a short to voltage.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
No
→ Go To 5
5
Turn the ignition off.
Disconnect the DRBIII
t from the DLC.
Disconnect the PCM harness connectors.
Turn the ignition on.
Measure the voltage of the SCI Receive circuit at the DLC.
Is the voltage above 1.0 volt?
All
Yes
→ Repair the SCI Receive circuit for a short to voltage.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
No
→ Go To 6
6
Turn the ignition off.
Disconnect the DRBIII
t from the DLC.
Disconnect the PCM harness connectors.
Measure the resistance between the SCI Transmit circuit and the SCI Receive circuit
at the PCM connector.
Is the resistance below 5.0 ohms?
All
Yes
→ Repair the short between the SCI Transmit and the SCI Receive
circuits.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
No
→ Go To 7
7
Turn the ignition off.
Disconnect the PCM C3 harness connector.
Disconnect the DRBIII
t from the DLC.
Measure the resistance between ground and the SCI Receive circuit.
Is the resistance below 5.0 ohms?
All
Yes
→ Repair the SCI Receive circuit for a short to ground.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
No
→ Go To 8
8
Turn the ignition off.
Disconnect the PCM C3 harness connector.
Disconnect the DRBIII
t from the DLC.
Measure the resistance of the SCI Receive circuit between the PCM C3 connector and
the DLC.
Is the resistance below 5.0 ohms?
All
Yes
→ Go To 9
No
→ Repair the SCI Receive circuit for an open.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
18
COMMUNICATION
*NO RESPONSE FROM PCM (SCI ONLY) —
Continued
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