Dodge Dakota (R1). Manual — part 35

TEST

ACTION

APPLICABILITY

4

Turn the ignition off.
Replace fuse #27 in the junction block.
Disconnect the CAB C1 harness connector.
Turn the ignition on.
Remove and inspect fuse #27 in the junction block.
Is the fuse open?

All

Yes

→

Go To

5

No

→

Replace the Controller Antilock Brake in accordance with the
Service Information.
Perform ABS VERIFICATION TEST - VER 1.

5

Turn the ignition off.
Disconnect the CAB C1 harness connector.
Disconnect the Junction Block C2 harness connector.
Measure the resistance between ground and the Fused Ignition Switch Output
circuit.
Is the resistance below 5.0 ohms?

All

Yes

→

Repair the Fused Ignition Switch Output circuit for a short to
ground.
Perform ABS VERIFICATION TEST - VER 1.

No

→

Replace the Junction Block.
Perform ABS VERIFICATION TEST - VER 1.

6

Turn the ignition off.
Disconnect the CAB C1 harness connector.
Measure the resistance between ground and each ground circuit.
Is the resistance below 5.0 ohms for each measurement?

All

Yes

→

Go To

7

No

→

Repair the ground circuit(s) for an open.
Perform ABS VERIFICATION TEST - VER 1.

7

Turn the ignition off.
NOTE: Ensure fuse #27 is installed in the junction block.
Disconnect the CAB 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

8

No

→

Repair the Fused Ignition Switch Output circuit for an open.
Perform ABS VERIFICATION TEST - VER 1.

137

COMMUNICATION

*NO RESPONSE FROM CONTROLLER ANTILOCK BRAKE —

Continued

TEST

ACTION

APPLICABILITY

8

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 CAB 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 CAB 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

9

No

→

Repair the PCI Bus circuit for an open.
Perform ABS VERIFICATION TEST - VER 1.

9

If there are no possible causes remaining, view repair.

All

Repair

Replace the Controller Antilock Brake in accordance with the
Service Information.
Perform ABS VERIFICATION TEST - VER 1.

138

COMMUNICATION

*NO RESPONSE FROM CONTROLLER ANTILOCK BRAKE —

Continued

Symptom:

*NO RESPONSE FROM ECM - DIESEL ONLY

POSSIBLE CAUSES

ATTEMPT TO COMMUNICATE WITH THE PCM

CHECK ECM POWERS AND GROUNDS

SCI TRANSMIT CIRCUIT OPEN

ENGINE CONTROL MODULE

TEST

ACTION

APPLICABILITY

1

Turn the ignition on.
With the DRB attempt to communicate with the PCM.
Was the DRB able to communicate with the PCM?

All

Yes

→

Go To

2

No

→

Refer to symptom list for problems related to No Response From
ECM and PCM.
Perform ROAD TEST VERIFICATION - VER-2.

2

Perform the symptom Checking ECM and PCM Power and Ground Circuits in the
Driveability category.
Did the vehicle pass this test?

All

Yes

→

Go To

3

No

→

Repair as necessary.
Perform ROAD TEST VERIFICATION - VER-2.

3

Turn the ignition off.
Disconnect the ECM harness connectors.
Measure the resistance of the SCI Transmit circuit between the ECM connector and
the DLC.
Is the resistance below 5.0 ohms?

All

Yes

→

Replace and the Engine Control Module in accordance with the
Service Information.
Perform ROAD TEST VERIFICATION - VER-2.

No

→

Repair the SCI Transmit circuit for an open.
Perform ROAD TEST VERIFICATION - VER-2.

139

COMMUNICATION

Symptom:

*NO RESPONSE FROM ECM AND PCM (DIESEL ONLY)

POSSIBLE CAUSES

CHECK ECM/PCM POWERS AND GROUNDS

POWERTRAIN CONTROL MODULE - SCI TRANSMIT

SCI TRANSMIT CIRCUIT SHORTED TO VOLTAGE

SCI CIRCUITS SHORTED TOGETHER

SCI TRANSMIT CIRCUIT SHORTED TO GROUND

SCI TRANSMIT CIRCUIT OPEN

ENGINE CONTROL MODULE

TEST

ACTION

APPLICABILITY

1

Perform the symptom Checking ECM and PCM Power and Ground Circuits in the
Driveability category.
Did the vehicle pass this test?

All

Yes

→

Go To

2

No

→

Repair as necessary.
Perform ROAD TEST VERIFICATION - VER-2.

2

Turn the ignition off.
NOTE: Reconnect all previously disconnected components.
Disconnect the PCM harness connectors.
Turn the ignition on.
With the DRB, attempt to communicate with the ECM.
Was the DRB able to communicate with the ECM?

All

Yes

→

Replace and program the Powertrain Control Module in accor-
dance with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.

No

→

Go To

3

3

Turn the ignition off.
Disconnect the DRB from the DLC.
Disconnect the PCM harness connectors.
Disconnect the ECM harness connectors.
Turn the ignition on.
Measure the voltage of the SCI Transmit circuit at the DLC connector.
Is the voltage above 1.0 volt?

All

Yes

→

Repair the SCI Transmit circuit for a short to voltage.
Perform ROAD TEST VERIFICATION - VER-2.

No

→

Go To

4

140

COMMUNICATION