Dodge Dakota (ND). Manual — part 755
P0586-SPEED CONTROL VENT CONTROL CIRCUIT
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ENGINE ELECTRICAL DIAGNOSTICS
ND
P0586-SPEED CONTROL VENT CONTROL CIRCUIT (CONTINUED)
For the Engine circuit diagram (Refer to 9 - ENGINE - SCHEMATICS AND DIAGRAMS).
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
Ignition on and battery voltage greater than 10 volts.
•
Set Condition:
An open or shorted condition detected in the Speed control vent solenoid control circuit. One Trip Fault. Three
good trips to turn off the MIL.
Possible Causes
(V32) S/C SUPPLY CIRCUIT OPEN
(V32) S/C SUPPLY SHORT TO GROUND
(V35) S/C VENT SOL CONTROL CIRCUIT SHORTED TO GROUND
(V35) S/C VENT SOL CONTROL CIRCUIT OPEN
(Z155) GROUND CIRCUIT OPEN
SPEED CONTROL VENT SOLENOID
PCM
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING).
Diagnostic Test
1.
SPEED CONTROL VENT CONTROL
Ignition on, engine not running.
With the scan tool, read DTCs and record the related Freeze Frame data.
With the scan tool, actuate the Speed Control Vent Solenoid and note operation.
Does the Speed Control Vacuum Solenoid actuate properly?
Yes
>> Refer to the INTERMITTENT CONDITION symptom in the Driveability category.
Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 2
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ENGINE ELECTRICAL DIAGNOSTICS
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P0586-SPEED CONTROL VENT CONTROL CIRCUIT (CONTINUED)
2.
(V30) S/C BRAKE SWITCH OUTPUT CIRCUIT
Turn the ignition off.
Disconnect the S/C Servo harness connector.
Ignition on, engine not running.
Using the scan tool, actuate the S/C Vent Solenoid.
Using a test light connected to ground, probe the (V30) S/C Brake
Switch Output circuit in the S/C Servo harness connector.
Does the test light illuminate brightly and flash on and off?
Yes
>> Go To 5
No
>> Go To 3
3.
(V32) S/C SUPPLY CIRCUIT
Turn the ignition off.
Connect the S/C Servo harness connector.
Disconnect the Stop Lamp Switch harness connector.
Ignition on, engine not running.
Using the scan tool, actuate the S/C Vent Solenoid.
Using a test light connected to ground, probe the (V32) S/C Supply
circuit in the Stop Lamp Switch harness connector.
Does the test light illuminate brightly?
Yes
>> Go To 4
No
>> Go To 8
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ENGINE ELECTRICAL DIAGNOSTICS
ND
P0586-SPEED CONTROL VENT CONTROL CIRCUIT (CONTINUED)
4.
(Z155) S/C GROUND CIRCUIT OPEN
Turn the ignition off.
Disconnect the S/C Servo harness connector.
Measure the resistance between ground and the (Z155) S/C Ground
circuit at the S/C Servo harness connector.
Is the resistance below 5.0 ohms?
Yes
>> Go To 5
No
>> Repair the open in the (Z155) S/C Ground circuit.
Perform POWERTRAIN VERIFICATION TEST. (Refer to 9
- ENGINE - STANDARD PROCEDURE)
5.
SPEED CONTROL VENT SOLENOID
Ignition on, engine not running.
With the scan tool, actuate the Speed Control Vent Solenoid.
Using a 12-volt test light connected to battery voltage, probe the (V36)
S/C Vent Control circuit.
Does the test light illuminate brightly and flash on and off?
Yes
>> Replace the Speed Control Servo.
Perform POWERTRAIN VERIFICATION TEST. (Refer to 9
- ENGINE - STANDARD PROCEDURE)
No
>> Go To 6
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ENGINE ELECTRICAL DIAGNOSTICS
9 - 561
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