Dodge Neon 2001 Service Manual page 130

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