Dodge Durango (HB). Manual — part 912
P0585-SPEED CONTROL SWITCH 1/2 CORRELATION (5.7L) (CONTINUED)
9.
S/C SWITCH SIGNAL CIRCUITS SHORTED TO THE (V937) SWITCH RETURN CIRCUIT
Measure the resistance between the (V937) Switch Return circuit and
both of the (V37) and (V38) S/C Switch Signal circuits in the Speed
Control harness connector.
Is the resistance below 5.0 ohms?
Yes
>> Repair the short between the (V937) Switch Return circuit
and the (V37) or (V38) S/C Switch Signal circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 10
10.
(V37) S/C SWITCH NO.1 SIGNAL CIRCUIT SHORTED TO THE (V38) S/C SWITCH NO.2 SIGNAL
CIRCUIT
Measure the resistance between the (V37) S/C Switch No.1 Signal cir-
cuit and the (V38) S/C Switch No.2 Signal circuit at both Speed Con-
trol harness connectors.
Is the resistance below 100 ohms for each circuit?
Yes
>> Repair the short between the (V38) S/C Switch No.2 Sig-
nal circuit and the (V37) S/C Switch No.1 Signal circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 11
HB
ENGINE ELECTRICAL DIAGNOSTICS
9 - 647
P0585-SPEED CONTROL SWITCH 1/2 CORRELATION (5.7L) (CONTINUED)
11.
S/C SWITCH SIGNAL CIRCUITS SHORTED TO GROUND
Measure the resistance between ground and the (V37) and (V38) S/C
Switch Signal circuits at both Switch harness connectors.
Is the resistance below 100 ohms?
Yes
>> Repair the short to ground in the (V37) or (V38) S/C
Switch Signal circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 12
9 - 648
ENGINE ELECTRICAL DIAGNOSTICS
HB
P0585-SPEED CONTROL SWITCH 1/2 CORRELATION (5.7L) (CONTINUED)
12.
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 values?
Yes
>> Replace the Speed Control Switch.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 13
13.
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 - 649
P0586-SPEED CONTROL VENT CONTROL CIRCUIT
9 - 650
ENGINE ELECTRICAL DIAGNOSTICS
HB
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