Dodge Dakota (R1). Manual — part 124
Symptom:
*PCI BUS COMMUNICATION FAILURE
POSSIBLE CAUSES
WITH THE DRB PERFORM A MODULE SCAN
OPEN PCI BUS CIRCUIT AT THE DATA LINK CONNECTOR
USING THE DRB, PERFORM THE PCI BUS CONTROL MODE
DISCONNECT THE MODULE HARNESS CONNECTOR
PCI BUS CIRCUIT SHORTED TO VOLTAGE
DISCONNECT THE MODULE HARNESS CONNECTOR
PCI BUS CIRCUIT SHORTED TO GROUND
WIRING HARNESS INTERMITTENT FAILURE
TEST
ACTION
APPLICABILITY
1
Note: Determine which modules this vehicle is equipped with before begin-
ning.
Connect the Diagnostic Junction Port Tester #8339 to the DRB and to the Diagnostic
Junction Port.
Using the DRB, along with the Diagnostic Junction Port Tester #8339, select
Junction Port Tool then PCI Bus Module Scan and follow the instructions on the
DRB.
Was the DRB able to scan (I/D or communicate) with any modules?
All
Yes
→
Refer to the Communication category for the related symptom(s).
(Individual module no responses).
Perform BODY VERIFICATION TEST - VER 1.
No
→
2
Turn the ignition off.
Measure the resistance of the PCI Bus circuit between the Data Link Connector and
the Diagnostic Junction Port connector.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair the PCI Bus circuit for an open between the DLC and the
Diagnostic Junction Port.
Perform BODY VERIFICATION TEST - VER 1.
31
COMMUNICATION
TEST
ACTION
APPLICABILITY
3
Note: Determine which modules this vehicle is equipped with before begin-
ning.
Connect the Diagnostic Junction Port Tester #8339 to the DRB and to the Diagnostic
Junction Port.
Using the DRB, along with the Diagnostic Junction Port Tester #8339, select
Junction Port Tool then PCI Bus Control Mode and follow the instructions on the
DRB.
Note: Perform this function on each pin that is equipped with a PCI Bus
circuit.
Did the DRB display No Modules Responding from any of the pins that were
scanned?
All
Yes
→
No
→
Check the PCI Bus circuit between the DLC and the Diagnostic
Junction Port connector for a short to voltage or to ground.
Perform BODY VERIFICATION TEST - VER 1.
4
Disconnect the Diagnostic Junction Port Tester cable from the DRB. Keep the tester
connected to the Diagnostic Junction Port.
Turn the ignition on.
Measure the voltage of the PCI Bus circuit on the Diagnostic Junction Port Tester
that the DRB displayed No Modules Responding.
Is the voltage steadily above 7.0 volts?
All
Yes
→
No
→
5
Measure the voltage of the PCI Bus circuit on the Diagnostic Junction Port tester
that previously measured above 7.0 volts.
Note: Turn the ignition off before disconnecting any module harness
connector then turn the ignition on.
Disconnect the module harness connector(s).
Is the voltage steadily above 7.0 volts with the module disconnected.
All
Yes
→
Repair the PCI Bus circuit that measured over 7.0 volts for a
short to voltage.
Perform BODY VERIFICATION TEST - VER 1.
No
→
Replace the module that when disconnected the short to voltage
was eliminated.
Perform BODY VERIFICATION TEST - VER 1.
6
Disconnect the Diagnostic Junction Port Tester cable from the DRB. Keep the tester
connected to the Diagnostic Junction Port.
Turn the ignition off.
Disconnect the negative battery cable.
Measure the resistance between ground and the PCI Bus circuit on the Diagnostic
Junction Port Tester that the DRB displayed No Modules Responding.
Is the resistance below 100.0 ohms?
All
Yes
→
No
→
32
COMMUNICATION
*PCI BUS COMMUNICATION FAILURE —
Continued
TEST
ACTION
APPLICABILITY
7
Disconnect the negative battery cable.
Measure the resistance between ground and the PCI Bus circuit at the Diagnostic
Junction Port tester that previously measured below 100.0 ohms.
Disconnect the module harness connector(s).
Is the resistance below 100.0 ohms with the module disconnected.
All
Yes
→
Repair the PCI Bus circuit that measured below 100.0 ohms for a
short to ground.
Perform BODY VERIFICATION TEST - VER 1.
No
→
Replace the module that when disconnected the short to ground
was eliminated.
Perform BODY VERIFICATION TEST - VER 1.
8
Turn the ignition off.
Note: Visually inspect the related wiring harness. Look for any chafed,
pierced, pinched, or partially broken wires.
Note: Visually inspect the related wire harness connectors. Look for broken,
bent, pushed out, or corroded terminals.
Were any problems found?
All
Yes
→
Repair wiring harness/connectors as necessary.
Perform BODY VERIFICATION TEST - VER 1.
No
→
Test Complete.
33
COMMUNICATION
*PCI BUS COMMUNICATION FAILURE —
Continued
Symptom:
P0115-TEMPERATURE OF ENGINE COOLANT SRC HIGH EX-
CEEDED
When Monitored and Set Condition:
P0115-TEMPERATURE OF ENGINE COOLANT SRC HIGH EXCEEDED
When Monitored:
With the ignition on.
Set Condition:
The voltage on the ECM engine coolant temperature sensor signal circuit
is above 4.9 volts for more than 3 seconds.
POSSIBLE CAUSES
INTERMITTENT CONDITION
ECM ECT SENSOR GROUND CIRCUIT OPEN
ECM ECT SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE
ECM ECT SENSOR
ECM ECT SENSOR SIGNAL CIRCUIT OPEN
ENGINE CONTROL MODULE
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRB, monitor the ECM Engine Coolant Temperature (ECT) Sensor voltage.
Is the ECM ECT Sensor voltage above 4.5 volts?
All
Yes
→
No
→
2
Turn the ignition off.
Disconnect the ECM ECT Sensor harness connector.
Turn the ignition on.
Measure the voltage on the ECM ECT Sensor Signal circuit.
Is the voltage above 5.5 volts?
All
Yes
→
Repair the ECM ECT Sensor Signal circuit for a short to voltage.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
3
Turn the ignition off.
Disconnect the ECM ECT Sensor harness connector.
Connect a jumper wire between the ECM ECT Sensor harness connector cavities.
Turn the ignition on.
With the DRB, read the ECM ECT Sensor voltage.
Is the voltage below 1.0 volt?
All
Yes
→
Replace the ECM ECT Sensor in accordance with the Service
Information.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
34
DRIVEABILITY - DIESEL
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