Dodge Ram Truck 1500-2500-3500. Manual — part 300

*NO RESPONSE FROM PCM (PCM SCI ONLY) - NGC (CONTINUED)

5.

(D20) SCI RECEIVE (PCM) CIRCUIT OPEN

CAUTION: Do not probe the PCM harness connectors. Probing
the PCM harness connectors will damage the PCM terminals
resulting in poor terminal to pin connection. Install Miller Special
Tool #8815 to perform diagnosis.
Measure the resistance of the (D20) SCI Receive (PCM) circuit
between the DLC and the appropriate terminal of special tool #8815.

Is the resistance below 5.0 ohms?

Yes

>> Go To 6

No

>> Repair the (D20) SCI Receive (PCM) circuit for an open.

Perform (NGC) POWERTRAIN VERIFICATION TEST -
VER 1.

6.

(D21) SCI TRANSMIT (PCM) CIRCUIT SHORTED TO THE (D20) SCI RECEIVE (PCM) CIRCUIT

Measure the resistance between the (D21) SCI Transmit (PCM) and
the (D20) SCI Receive (PCM) circuits.

Is the resistance below 5.0 ohms?

Yes

>> Repair the (D21) SCI Transmit (PCM) circuit for a short to

the (D20) SCI Receive (PCM) circuit.

Perform (NGC) POWERTRAIN VERIFICATION TEST -
VER 1.

No

>> Replace the Powertrain Control Module in accordance with

the service information.

Perform (NGC) POWERTRAIN VERIFICATION TEST -
VER 1.

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ELECTRONIC CONTROL MODULES - ELECTRICAL DIAGNOSTICS

DR/DH

*NO RESPONSE FROM RADIO

DR/DH

ELECTRONIC CONTROL MODULES - ELECTRICAL DIAGNOSTICS

8E - 73

*NO RESPONSE FROM RADIO (CONTINUED)

For a complete wiring diagram Refer to Section 8W.

Possible Causes

(Z514) (Z515) GROUND CIRCUIT OPEN

(A114) FUSED B+ CIRCUIT OPEN

(F983) FUSED IGNITION SWITCH OUTPUT CIRCUIT OPEN

(D25) PCI BUS CIRCUIT OPEN

RADIO

Diagnostic Test

1.

ESTABLISH COMMUNICATIONS WITH THE INSTRUMENT CLUSTER (MIC)

Turn the ignition on.

NOTE: Ensure there is PCI bus communication with other modules. If not, refer to the PCI Bus Communi-
cation Failure symptom and repair as necessary.
With the DRB, attempt to communicate with the MIC.

Was the DRB able to I/D or communicate with the MIC?

Yes

>> Go To 2

No

>> Refer to the table of contents and perform the related symptom.

Perform BODY VERIFICATION TEST - VER 1. (Refer to BODY VERIFICATION TEST - VER 1.)

2.

(Z514) (Z515) GROUND CIRCUIT OPEN

Turn the ignition off.

Disconnect the Radio C1 harness connector.

Using a 12-volt test light connected to 12-volts, probe each (Z514)
(Z515) ground circuit.

Is the test light illuminated for each circuit?

Yes

>> Go To 3

No

>> Repair the (Z514) (Z515) Ground circuit for an open.

Perform BODY VERIFICATION TEST - VER 1. (Refer to
BODY VERIFICATION TEST - VER 1.)

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ELECTRONIC CONTROL MODULES - ELECTRICAL DIAGNOSTICS

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*NO RESPONSE FROM RADIO (CONTINUED)

3.

(A114) FUSED B+ CIRCUIT OPEN

Using a 12-volt test light connected to ground, probe each (A114)
Fused B+ circuit.

Is the test light illuminated for each circuit?

Yes

>> Go To 4

No

>> Repair the (A114) Fused B+ circuit for an open.

Perform BODY VERIFICATION TEST - VER 1. (Refer to
BODY VERIFICATION TEST - VER 1.)

4.

(F983) FUSED IGNITION SWITCH OUTPUT CIRCUIT OPEN

Turn the ignition on.

Using a 12-volt test light connected to ground, probe the (F983) Fused
Ignition Switch Output circuit.

Is the test light illuminated?

Yes

>> Go To 5

No

>> Repair the (F983) Fused Ignition Switch Output circuit for

an open.

Perform BODY VERIFICATION TEST - VER 1. (Refer to
BODY VERIFICATION TEST - VER 1.)

DR/DH

ELECTRONIC CONTROL MODULES - ELECTRICAL DIAGNOSTICS

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