Dodge Dakota (R1). Manual — part 859
Symptom:
P1389-NO ASD RELAY OUTPUT VOLTAGE AT PCM
When Monitored and Set Condition:
P1389-NO ASD RELAY OUTPUT VOLTAGE AT PCM
When Monitored:
With ignition key on, battery voltage above 10.4 volts, and engine RPM
greater than 400.
Set Condition:
No voltage sensed at the PCM when the ASD relay is energized.
POSSIBLE CAUSES
WIRING HARNESS INTERMITTENT PROBLEM
ASD RELAY OUTPUT CIRCUIT OPEN
ASD RELAY OUTPUT CIRCUIT OPEN
FUSED B+ CIRCUIT OPEN
ASD RELAY
PCM
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t, read DTCs.
Is the Good Trip Counter displayed and equal to zero?
All
Yes
→
No
→
2
Attempt to start the engine.
Did the engine start?
All
Yes
→
No
→
3
Turn the ignition off.
Remove the ASD relay from the PDC.
Disconnect the PCM harness connector(s).
Measure the resistance of the ASD relay output circuit from the ASD Relay cavity in
PDC to the PCM harness connector.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair the open ASD Relay output circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
4
If there are no possible causes remaining, view repair.
All
Repair
Replace and program the Powertrain Control Module in accor-
dance with the Service Information.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
168
DRIVEABILITY - GAS
TEST
ACTION
APPLICABILITY
5
Turn the ignition off.
Remove the ASD relay from the PDC.
Disconnect the PCM harness connector(s).
Measure the resistance of the ASD relay output circuit from the ASD Relay cavity in
PDC to the PCM harness connector.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair the open ASD Relay output circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
6
Turn the ignition off.
Remove the ASD relay from the PDC.
Measure the Fused B+ circuit at the ASD Relay connector.
Is the voltage above 10.0 volts?
All
Yes
→
No
→
Repair the open fused B+ circuit. Note: Check fuse in the PDC.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
7
Install a substitute relay for the Auto Shutdown Relay.
Attempt to start the vehicle.
Did the engine start?
All
Yes
→
Replace the ASD Relay.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
No
→
Test Complete.
8
At this time, the conditions required to set the DTC are not present.
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.
Note: Refer to any technical service bulletins that may apply.
Perform a wiggle test on the related wiring harnesses with the engine running.
Watch for the Good Trip Counter to change to 0.
Were any problems found?
All
Yes
→
Repair wiring harness/connectors as necessary.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
No
→
Test Complete.
169
DRIVEABILITY - GAS
P1389-NO ASD RELAY OUTPUT VOLTAGE AT PCM —
Continued
Symptom:
P1391-INTERMITTENT LOSS OF CMP OR CKP
When Monitored and Set Condition:
P1391-INTERMITTENT LOSS OF CMP OR CKP
When Monitored:
Engine running or cranking.
Set Condition:
When the failure counter reaches 20 for 2 consecutive trips.
POSSIBLE CAUSES
CMP SENSOR OUT OF SYNC
DAMAGED TONE WHEEL/FLEX PLATE (CRANKSHAFT)
DAMAGED TONE WHEEL/PULSE RING (CAMSHAFT)
IRREGULAR LAB SCOPE PATTERN OF CMP SIGNAL
INTERMITTENT CKP SIGNAL LOSS WHEN WIRING IS WIGGLED
IRREGULAR LAB SCOPE PATTERN OF CKP SIGNAL
WIRING HARNESS INTERMITTENT
INTERMITTENT CMP SIGNAL LOSS WHEN WIRING IS WIGGLED
SENSOR CONNECTOR/WIRING
SENSOR CONNECTOR/WIRING
CAMSHAFT POSITION SENSOR
CKP SENSOR CONNECTOR/WIRING
CRANKSHAFT POSITION SENSOR
TEST
ACTION
APPLICABILITY
1
Turn ignition on.
With the DRBIII
t, read DTCs.
Is the DTC Good Trip Counter displayed and equal to zero for P1391?
All
Yes
→
No
→
2
Warning: When performing the following test, the engine will be running.
Be careful not to stand in line with the fan blades or fan belt. Do not wear
loose clothing.
Start the engine and run until operating temp is reached. (Closed Loop)
With the DRBIII
t under the Misc. menu, choose the 9Set Sync Signal9 function and
observe the
9Actual Sync Setting.9
Does the
9Actual Sync Setting9 read 9In Range9?
All
Yes
→
No
→
Loosen the CMP sensor base hold down bolt and turn the base
until the sync is
9IN RANGE9 on the DRBIIIt.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
170
DRIVEABILITY - GAS
TEST
ACTION
APPLICABILITY
3
Turn ignition off.
With the DRBIII
t lab scope, back probe the CMP signal circuit at the CMP sensor
harness connector using Miller special tool #6801.
Warning: Keep clear of the engine’s moving parts.
Start the engine.
Observe the CMP sensor voltage pattern on the lab scope screen.
Are there any signals missing?
All
Yes
→
No
→
4
Turn the ignition off.
Visually inspect the related wire harness connectors. Look for broken, bent,
pushed out, or corroded terminals.
Visually inspect the related wiring harness. Look for any chafed, pierced,
pinched, or partially broken wires.
Note: Make sure the Camshaft Position Sensor and/or the Crankshaft
Position Sensor is tight.
Note: Refer to any technical service bulletins that may apply.
Were any problems found?
All
Yes
→
Repair as necessary.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→
5
Turn the ignition off.
Disconnect and remove the camshaft position sensor.
Inspect the tone wheel/pulse ring for looseness and/or physical damage.
Is the tone wheel/pulse ring free from defects?
All
Yes
→
No
→
Repair/replace tone wheel/pulse ring as necessary.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
6
If there are no possible causes remaining, view repair.
All
Repair
Replace the Camshaft Position Sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
7
Turn the ignition off.
With the DRBIII
t lab scope, back probe the CKP signal circuit at the CKP sensor
harness connector using Miller special tool #6801.
Warning: Keep clear of the engine’s moving parts.
Start the engine.
Observe the CKP sensor voltage pattern on the lab scope screen.
Are there any signals missing?
All
Yes
→
No
→
171
DRIVEABILITY - GAS
P1391-INTERMITTENT LOSS OF CMP OR CKP —
Continued
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