Chrysler PT Cruiser. Manual — part 49
TEST
ACTION
APPLICABILITY
4
Turn the ignition off.
Disconnect the DRBIII
t from the DLC.
Disconnect the PCM harness connector.
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 - 1.6L.
No
→ Go To 5
5
Turn the ignition off.
Disconnect the PCM 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
→ Repair the SCI Transmit circuit for a short to ground.
Perform POWERTRAIN VERIFICATION TEST VER-1 - 1.6L.
No
→ Go To 6
6
Turn the ignition off.
Disconnect the PCM 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 - 1.6L.
No
→ Go To 7
7
Turn the ignition off.
Disconnect the PCM harness connector.
Disconnect the DRBIII
t from the DLC.
Measure the resistance of the SCI Receive circuit between the PCM connector and
the DLC.
Is the resistance below 5.0 ohms?
All
Yes
→ Go To 8
No
→ Repair the SCI Receive circuit for an open.
Perform POWERTRAIN VERIFICATION TEST VER-1 - 1.6L.
8
Turn the ignition off.
Disconnect the PCM harness connector.
Disconnect the DRBIII
t from the DLC.
Measure the resistance of the SCI Transmit circuit between the PCM connector and
the DLC.
Is the resistance below 5.0 ohms?
All
Yes
→ Replace and program the Powertrain Control Module in accor-
dance with the Service Information.
Perform POWERTRAIN VERIFICATION TEST VER-1 - 1.6L.
No
→ Repair the SCI Transmit circuit for an open.
Perform POWERTRAIN VERIFICATION TEST VER-1 - 1.6L.
183
COMMUNICATION
*NO RESPONSE FROM PCM (SCI ONLY) - 1.6L —
Continued
Symptom:
*NO RESPONSE FROM RADIO
POSSIBLE CAUSES
NO RESPONSE FROM RADIO
OPEN FUSED IGNITION SWITCH OUTPUT CIRCUIT
OPEN FUSED B+ CIRCUIT
RADIO GROUND CIRCUIT OPEN
OPEN PCI BUS CIRCUIT
RADIO
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
NOTE: Check fuses before continuing.
NOTE: As soon as one or more module communicates with the DRB, answer
the question.
With the DRB, attempt to communicate with the Airbag Control Module.
With the DRB, attempt to communicate with the Instrument Cluster (MIC).
Was the DRB able to I/D or establish communications with either of the modules?
All
Yes
→ Go To 2
No
→ Refer to the Communications category and perform the symptom
PCI Bus Communication Failure.
Perform BODY VERIFICATION TEST - VER 1.
2
Turn the ignition off.
Disconnect the Radio C1 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 3
No
→ Check Fuse Block fuse for an open. If ok, repair the Fused Ignition
Switch Output circuit for an open or short. Refer to the wiring
diagrams located in the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
3
Turn the ignition off.
Disconnect the Radio C1 harness connector.
Using a 12-volt test light connected to ground, probe each Fused B+ circuit.
Is the test light illuminated for each circuit?
All
Yes
→ Go To 4
No
→ Repair the Fused B+ circuit for an open or short. Refer to the
wiring diagrams located in the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
184
COMMUNICATION
TEST
ACTION
APPLICABILITY
4
Turn the ignition off.
Disconnect the Radio C1 harness connector.
Using a 12-volt test light connected to 12-volts, probe each ground circuit.
Is the test light illuminated for each circuit?
All
Yes
→ Go To 5
No
→ Repair the ground circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
5
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 Radio 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 Radio 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 6
No
→ Repair the PCI Bus circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
6
If there are no possible causes remaining, view repair.
All
Repair
Replace the Radio in accordance with the service information.
Perform BODY VERIFICATION TEST - VER 1.
185
COMMUNICATION
*NO RESPONSE FROM RADIO —
Continued
Symptom:
*NO RESPONSE FROM RKE
POSSIBLE CAUSES
OPEN GROUND CIRCUIT
OPEN FUSED B+ CIRCUIT
OPEN FUSED IGNITION SWITCH OUTPUT CIRCUIT
OPEN PCI BUS CIRCUIT
REMOTE KEYLESS ENTRY MODULE
TEST
ACTION
APPLICABILITY
1
Turn the ignition off.
Turn all lights off.
Disconnect the RKE Module harness connector.
Using a 12-volt test light connected to 12-volts, probe both ground circuits.
Is the test light illuminated for both ground circuits?
All
Yes
→ Go To 2
No
→ Repair the ground circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
2
Turn the ignition off.
Disconnect the RKE Module harness connector.
Using a 12-volt test light connected to ground, probe each Fused B+ circuit.
Is the test light illuminated for each Fused B+ circuit?
All
Yes
→ Go To 3
No
→ Check the fuses that feed the Fused B+ circuits for an open. If ok,
repair the Fused B+ circuit that did not illuminate the test light
for an open. Refer to the wiring diagrams in the service informa-
tion.
Perform BODY VERIFICATION TEST - VER 1.
3
Turn the ignition off.
Disconnect the RKE 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 4
No
→ Repair the Fused Ignition Switch Output circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
186
COMMUNICATION
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