Dodge Ram Truck 1500-2500-3500. Manual — part 928
P0581-SPEED CONTROL SWITCH 1 CIRCUIT HIGH (5.7L) (CONTINUED)
7.
SPEED CONTROL SWITCH VOLTAGE VALUES
Allow the engine to idle.
With a scan tool, monitor the S/C Switch voltage readings.
SWITCH POSITION
SWITCH No.1 VOLTAGE VALUE
SWITCH No.2 VOLATGE VALUE
NO SWITCHES PRESSED
4.31 to 4.78 volts
4.31 to 4.78 volts
ON/OFF PRESSED
0.59 to 1.13 volts
3.53 to 3.92 volts
RES/ACCEL PRESSED
3.88 to 4.17 volts
2.04 to 2.47 volts
SET PRESSED
3.16 to 3.56 volts
1.17 to 1.56 volts
COAST PRESSED
2.57 to 2.94 volts
0.77 to 1.09 volts
CANCEL PRESSED
1.59 to 1.99 volts
2.84 to 3.25 volts
Take these same voltage measurements with a voltmeter by back probing the (V37) S/C Switch No.1 Signal circuit
at the switches.
Compare the voltage readings on the voltmeter to what the scan tool displayed.
Are the voltage readings out of the listed specification and is there less than a 0.2 of a volt difference
between the voltmeter switch values and the scan tool switch value?
Yes
>> Replace the Speed Control Switch.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 8
8.
PCM
NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal
push out. Repair as necessary.
Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and
Ground circuits.
Were there any problems found?
Yes
>> Repair as necessary.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Replace and program the Powertrain Control Module per Service Information.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
9 - 634
ENGINE - ELECTRICAL DIAGNOSTICS - 3.7L/4.7L/5.7L
DR/DH
P0582-SPEED CONTROL VACUUM CONTROL CIRCUIT
DR/DH
ENGINE - ELECTRICAL DIAGNOSTICS - 3.7L/4.7L/5.7L
9 - 635
P0582-SPEED CONTROL VACUUM 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 vacuum 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
(V36) S/C VACUUM SOL CONTROL CIRCUIT SHORTED TO GROUND
(V36) S/C VACUUM SOL CONTROL CIRCUIT OPEN
(Z913) GROUND CIRCUIT OPEN
SPEED CONTROL VACUUM SOLENOID
PCM
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING).
Diagnostic Test
1.
SPEED CONTROL VACUUM 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 Vacuum Solenoid and note operation.
Does the Speed Control Vacuum Solenoid actuate properly?
Yes
>> Refer to the INTERMITTENT CONDITION symptom in the Driveability category.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 2
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 Vacuum 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
9 - 636
ENGINE - ELECTRICAL DIAGNOSTICS - 3.7L/4.7L/5.7L
DR/DH
P0582-SPEED CONTROL VACUUM CONTROL CIRCUIT (CONTINUED)
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 Vacuum 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
4.
(Z913) S/C GROUND CIRCUIT OPEN
Turn the ignition off.
Disconnect the S/C Servo harness connector.
Measure the resistance of the (Z913) S/C Ground circuit at the S/C
Servo harness connector to ground.
Is the resistance below 5.0 ohms?
Yes
>> Go To 5
No
>> Repair the open in the (Z913) S/C Ground circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
DR/DH
ENGINE - ELECTRICAL DIAGNOSTICS - 3.7L/4.7L/5.7L
9 - 637
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