Chrysler Town and Country 2003 Owner's Manual page 421

*NO RESPONSE FROM PCM (SCI ONLY) - SBEC —
TEST
4 Turn the ignition off.
Disconnect the DRB from the DLC.
Disconnect the PCM harness connectors.
Disconnect the TCM harness connector (if equipped).
Turn the ignition on.
Measure the voltage of the SCI Transmit (PCM) circuit at the DLC connector.
Is the voltage above 1.0 volt?
Yes → Repair the SCI Transmit (PCM) circuit for a short to voltage.
→ Go To 5
No
5 Turn the ignition off.
Disconnect the DRB from the DLC.
Disconnect the PCM harness connectors.
Turn the ignition on.
Measure the voltage of the SCI Receive (PCM) circuit at the DLC connector.
Is the voltage above 1.0 volt?
Yes → Repair the SCI Receive (PCM) circuit for a short to voltage.
→ Go To 6
No
6 Turn the ignition off.
Disconnect the DRB from the DLC.
Disconnect the PCM harness connectors.
Measure the resistance between the SCI Transmit (PCM) circuit and the SCI Receive
(PCM) circuit at the PCM connector.
Is the resistance below 5.0 ohms?
Yes → Repair the short between the SCI Transmit (PCM) and the SCI
→ Go To 7
No
7 Turn the ignition off.
Disconnect the PCM C2 harness connector.
Disconnect the DRB from the DLC.
Measure the resistance between ground and the SCI Receive (PCM) circuit.
Is the resistance below 5.0 ohms?
Yes → Repair the SCI Receive (PCM) circuit for a short to ground.
→ Go To 8
No
8 Turn the ignition off.
Disconnect the PCM C2 harness connector.
Disconnect the DRB from the DLC.
Measure the resistance of the SCI Receive (PCM) circuit between the PCM C2
connector and the DLC.
Is the resistance below 5.0 ohms?
Yes → Go To 9
→ Repair the SCI Receive (PCM) circuit for an open.
No
ACTION
Perform POWERTRAIN VERIFICATION TEST VER - 1.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
Receive (PCM) circuits.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
397
COMMUNICATION
Continued
APPLICABILITY
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