Dodge Durango (HB). Manual — part 908
P0581-SPEED CONTROL SWITCH 1 CIRCUIT HIGH (5.7L) (CONTINUED)
3.
CLOCKSPRING
Disconnect the C1 and C3 Clockspring harness connector per Service
Information.
Measure the resistance of the (V937) Switch Return circuit between
the C1 and C3 Clockspring harness connectors.
Measure the resistance of the (V37) S/C Switch No.1 Signal circuit
between the C1 and C3 Clockspring harness connectors.
Was the resistance above 5.0 ohms for either circuit?
Yes
>> Replace the clockspring.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 4
4.
(V37) S/C SWITCH NO.1 SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE
Connect the Clockspring harness connectors per Service Information.
Disconnect the C3 PCM harness connector.
Ignition on, engine not running.
Measure the voltage on the (V37) S/C Switch No.1 Signal circuit in the
Speed Control harness connector.
Is the voltage above 5.2 volts?
Yes
>> Repair the short to battery voltage in the (V37) S/C Switch
No.1 Signal circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 5
HB
ENGINE ELECTRICAL DIAGNOSTICS
9 - 631
P0581-SPEED CONTROL SWITCH 1 CIRCUIT HIGH (5.7L) (CONTINUED)
5.
(V37) S/C SWITCH NO.1 SIGNAL CIRCUIT OPEN
NOTE: The measurement must be taken from both Speed Control
Switch harness connectors.
Turn the ignition off.
CAUTION: Do not probe the PCM harness connectors. Probing
the PCM harness connectors will damage the PCM terminals
resulting in poor terminal to pin connection. Install Miller Special
Tool #8815 to perform diagnosis.
Measure the resistance of the (V37) S/C Switch No.1 Signal circuit
from the Speed Control harness connector to the appropriate terminal
of special tool #8815.
Is the resistance below 5.0 ohms?
Yes
>> Go To 6
No
>> Repair the open in the (V37) S/C Switch No.1 Signal cir-
cuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
6.
(V937) SWITCH RETURN CIRCUIT OPEN
NOTE: The measurement must be taken from both Speed Control
Switch harness connectors.
Measure the resistance of the (V937) Switch Return circuit from the
Speed Control harness connector to the appropriate terminal of special
tool #8815.
Is the resistance below 5.0 ohms?
Yes
>> Go To 7
No
>> Repair the open in the (V937) Switch Return circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
9 - 632
ENGINE ELECTRICAL DIAGNOSTICS
HB
P0581-SPEED CONTROL SWITCH 1 CIRCUIT HIGH (5.7L) (CONTINUED)
7.
SPEED CONTROL SWITCH VOLTAGE VALUES
Connect the C3 PCM harness connector and the S/C Switch harness connectors.
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 and 1.13 volts
3.53 and 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)
HB
ENGINE ELECTRICAL DIAGNOSTICS
9 - 633
P0586-SPEED CONTROL VACUUM CONTROL CIRCUIT
9 - 634
ENGINE ELECTRICAL DIAGNOSTICS
HB
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