Chrysler PT Cruiser 2001 Service Manual Supplement page 2019

COMMUNICATION
*NO RESPONSE FROM CAB —
TEST
4 Turn the ignition off.
Ensure Fuse #11 is installed.
Disconnect the CAB harness connector.
Note: Check connector - Clean/repair as necessary.
Turn the ignition on.
Measure the voltage of the Fused Ignition Switch Output circuit.
Is the voltage above 10.0 volts?
Yes → Go To 5
→ Repair the Fused Ignition Switch Output circuit for an open.
No
5 NOTE: Ensure there is PCI bus communication with other modules. If not,
refer to the PCI Bus Communication Failure symptom and repair as
necessary.
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.
Select DRB Standalone.
Select lab scope.
Select Live.
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.
Disconnect the CAB harness connector.
Connect the Black lead to the chassis ground. Connect the Red lead to the PCI Bus
circuit in the CAB harness connector.
Turn the ignition on.
Observe the voltage display on the DRB Lab Scope.
What is the voltage display on the scope?
Pulse from 0 to approximately 7.5 volts
Steady 0 volts
6 If there are no potential causes remaining, view repair.
Repair
Continued
ACTION
Perform ABS VERIFICATION TEST.
Go To 6
Repair the PCI Bus circuit for an open.
Perform ABS VERIFICATION TEST.
Replace the CAB.
Perform ABS VERIFICATION TEST.
62
APPLICABILITY
All
All
All