Dodge Ram. Manual - part 74

TEST

ACTION

APPLICABILITY

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 SKIM 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 SKIM 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

→ Repair the PCI Bus circuit for an open.

Perform SKIS VERIFICATION.

If there are no possible causes remaining, view repair.

All

Repair

Replace and program the Sentry Key Immobilizer Module in
accordance with the Service Information.
Perform SKIS VERIFICATION.

293

COMMUNICATION

*NO RESPONSE FROM SENTRY KEY IMMOBILIZER MODULE —

Continued

Symptom:

*NO RESPONSE FROM TRANSFER CASE CONTROL MODULE

POSSIBLE CAUSES

NO RESPONSE FROM TRANSFER CASE CONTROL MODULE

FUSED B(+) CIRCUIT OPEN

GROUND CIRCUIT OPEN

OPEN PCI BUS CIRCUIT

TRANSFER CASE CONTROL MODULE

TEST

ACTION

APPLICABILITY

Turn the ignition on.
NOTE: As soon as one or more module communicates with the DRBIII

answer the question.
With the DRBIII

t, attempt to communicate with the Airbag Control Module.

With the DRBIII

t, attempt to communicate with the Front Control Module.

Was the DRBIII

t able to I/D or establish communications with either of the modules?

All

Yes

→ Go To 2

→ Refer to the Communications category and perform the symptom

PCI Bus Communication Failure.
Perform TRANSFER CASE VERIFICATION TEST.

Turn the ignition off to the lock position.
Disconnect the TCCM harness connectors.
Using a 12-volt test light connected to ground, check the Fused B(+) circuit in the
TCCM harness connector.
NOTE: The test light must illuminate brightly. Compare the brightness to
that of a direct connection to the battery.
Does the test light illuminate brightly?

All

Yes

→ Go To 3

→ Repair the Fused B(+) circuit for an open. If the fuse is open make

sure to check for a short to ground. Refer to the wiring diagrams
located in the Service Information.
Perform TRANSFER CASE VERIFICATION TEST.

Turn the ignition off to the lock position.
Disconnect the TCCM harness connectors.
Using a 12-volt test light connected to 12-volts, check each ground circuit in the
TCCM harness connectors.
NOTE: The test light must illuminate brightly. Compare the brightness to
that of a direct connection to the battery.
Does the test light illuminate brightly for each Ground circuit?

All

Yes

→ Go To 4

→ Repair the Ground circuit for an open. Refer to the wiring

diagrams located in the Service Information.
Perform TRANSFER CASE VERIFICATION TEST.

294

COMMUNICATION

TEST

ACTION

APPLICABILITY

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.
Turn the ignition off to the lock position.
Disconnect the TCCM 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. Set Probe to x10.
Press F2 again when complete.
Connect the Black lead to the chassis ground. Connect the Red lead to the PCI Bus
circuit in the TCCM connector.
Turn the ignition on.
Observe the voltage display on the DRBIII

t Lab Scope.

Does the voltage pulse from 0 to approximately 7.5 volts?

All

Yes

→ Go To 5

→ Repair the PCI Bus circuit for an open.

Perform TRANSFER CASE VERIFICATION TEST.

If there are no possible causes remaining, view repair.

All

Repair

Replace the Transfer Case Control Module in accordance with the
service information.
Perform TRANSFER CASE VERIFICATION TEST.

295

COMMUNICATION

*NO RESPONSE FROM TRANSFER CASE CONTROL MODULE —

Continued

Symptom:

*NO RESPONSE FROM TRANSMISSION CONTROL MODULE

POSSIBLE CAUSES

NO RESPONSE FROM TRANSMISSION CONTROL MODULE

FUSED IGNITION SWITCH OUTPUT CIRCUIT OPEN

FUSED B(+) CIRCUIT OPEN

GROUND CIRCUIT(S) OPEN

PCI BUS CIRCUIT OPEN

POWERTRAIN CONTROL MODULE

TEST

ACTION

APPLICABILITY

Turn the ignition on.
Note: As soon as one or more module communicates with the DRB, answer
the question.
With the DRB, attempt to communicate with the Instrument Cluster.
With the DRB, attempt to communicate with the Airbag Control Module.
Was the DRB able to I/D or establish communications with both of the modules?

All

Yes

→ Go To 2

→ Refer to the Communications category and perform the appropri-

ate symptom.
Perform (NGC) 45RFE/545RFE TRANSMISSION VERIFICA-
TION TEST - VER 1.

Turn the ignition off.
Disconnect the PCM harness connectors.
CAUTION: DO NOT PROBE THE PCM HARNESS CONNECTORS. PROBING
THE PCM HARNESS CONNECTORS WILL DAMAGE THE PCM TERMI-
NALS RESULTING IN POOR TERMINAL TO PIN CONNECTION. INSTALL
MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS.
Turn the ignition on.
Using a 12-volt test light connected to ground, probe both Fused Ignition Switch
Output circuits (cavs 11 and 12) in the appropriate terminal of special tool #8815.
NOTE: The test light must illuminate brightly. Compare the brightness to
that of a direct connection to the battery.
Is the test light illuminated for both circuits?

All

Yes

→ Go To 3

→ Repair the Fused Ignition Switch Output circuit for an open.

Refer to the wiring diagrams located in the Service Information.
Perform (NGC) 45RFE/545RFE TRANSMISSION VERIFICA-
TION TEST - VER 1.

296

COMMUNICATION

Content .. 72 73 74 75 ..