Dodge Durango (HB). Manual — part 903
P0579-SPEED CONTROL SWITCH 1 PERFORMANCE (5.7L) (CONTINUED)
7.
(V37) S/C NO.1 SWITCH SIGNAL CIRCUIT SHORTED TO GROUND
Measure the resistance between ground and the (V37) S/C Switch
No.1 Signal circuit in the Speed Control harness connector.
Is the resistance below 100 ohms?
Yes
>> Repair the short to ground in the (V37) S/C Switch No.1
Signal circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 8
8.
(V37) S/C SWITCH NO.1 SIGNAL CIRCUIT SHORTED TO THE (V937) S/C SWITCH RETURN CIRCUIT
Measure the resistance between the (V37) S/C Switch No.1 Signal cir-
cuit and the (V937) S/C Switch Return circuit in the Speed Control
harness connector.
Is the resistance below 5.0 ohms?
Yes
>> Repair the short between the (V37) S/C Switch No.1 Sig-
nal circuit and the (V937) Switch Return circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 9
HB
ENGINE ELECTRICAL DIAGNOSTICS
9 - 611
P0579-SPEED CONTROL SWITCH 1 PERFORMANCE (5.7L) (CONTINUED)
9.
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
and the (V38) S/C Switch No.2 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 10
10.
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 - 612
ENGINE ELECTRICAL DIAGNOSTICS
HB
P0580-SPEED CONTROL SWITCH 1 CIRCUIT LOW (3.7L, 4.7L)
HB
ENGINE ELECTRICAL DIAGNOSTICS
9 - 613
P0580-SPEED CONTROL SWITCH 1 CIRCUIT LOW (3.7L, 4.7L) (CONTINUED)
For the Engine circuit diagram (Refer to 9 - ENGINE - SCHEMATICS AND DIAGRAMS).
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
With the ignition key on. Battery voltage above 10 volts.
•
Set Condition:
When switch voltage is less than 0.43 of a volt for 2 minutes. One trip fault. Three good trips to turn off the
MIL.
Possible Causes
(V37) S/C SIGNAL NO.1 CIRCUIT SHORTED TO GROUND
(V37) S/C SIGNAL NO.1 CIRCUIT SHORTED TO THE (K900) SENSOR GROUND CIRCUIT
CLOCKSPRING
SPEED CONTROL ON/OFF SWITCH
SPEED CONTROL RESUME/ACCEL SWITCH
PCM
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING).
Diagnostic Test
1.
SPEED CONTROL SWITCH VOLTAGE LOW
NOTE: Do not press any of the Speed Control Switch buttons.
Ignition on, engine not running.
With a scan tool, read the Speed Control voltage.
Is the Speed Control voltage below 1.0 volt?
Yes
>> Go To 2
No
>> Refer to the INTERMITTENT CONDITION Diagnostic Procedure.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
2.
SPEED CONTROL ON/OFF SWITCH
Ignition on, engine not running.
With the scan tool, monitor the Speed Control Switch voltage.
Disconnect the Speed Control On/Off Switch harness connector per Service Information.
Did the voltage change to above 4.7 volts?
Yes
>> Replace the Speed Control On/Off Switch.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 3
9 - 614
ENGINE ELECTRICAL DIAGNOSTICS
HB
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