Dodge Durango (HB). Manual — part 943
P1593-SPEED CONTROL SWITCH 1/2 STUCK (CONTINUED)
6.
(V37) S/C SWITCH NO.1 SIGNAL CIRCUIT OPEN
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 both Speed Control harness connectors to the appropriate termi-
nals of special tool #8815.
Is the resistance below 5.0 ohms for both measurements?
Yes
>> Go To 7
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)
7.
(V38) S/C SWITCH NO.2 SIGNAL CIRCUIT OPEN
Measure the resistance of the (V38) S/C Switch No.2 Signal circuit
from both Speed Control harness connectors to the appropriate termi-
nals of special tool #8815.
Is the resistance below 5.0 ohms for both measurements?
Yes
>> Go To 8
No
>> Repair the open in the (V38) S/C Switch No.2 Signal cir-
cuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
HB
ENGINE ELECTRICAL DIAGNOSTICS
9 - 771
P1593-SPEED CONTROL SWITCH 1/2 STUCK (CONTINUED)
8.
(V937) SWITCH RETURN 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 for both measurements?
Yes
>> Go To 9
No
>> Repair the open in the (V937) Switch Return circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
9.
(V37) S/C SWITCH NO.1 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 10
9 - 772
ENGINE ELECTRICAL DIAGNOSTICS
HB
P1593-SPEED CONTROL SWITCH 1/2 STUCK (CONTINUED)
10.
(V38) S/C SWITCH NO.2 SIGNAL CIRCUIT SHORTED TO GROUND
Measure the resistance between ground and the (V38) S/C Switch
No.2 Signal circuit in the Speed Control harness connector.
Is the resistance below 100 ohms?
Yes
>> Repair the short to ground in the (V38) S/C Switch No.2
Signal circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 11
11.
(V37) S/C SWITCH NO.1 SIGNAL CIRCUIT SHORTED TO THE (V937) SWITCH RETURN CIRCUIT
Measure the resistance between the (V37) S/C Switch No.1 Signal cir-
cuit and the (V937) Switch Return circuit 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) S/C Switch No.1 Signal circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 12
HB
ENGINE ELECTRICAL DIAGNOSTICS
9 - 773
P1593-SPEED CONTROL SWITCH 1/2 STUCK (CONTINUED)
12.
(V38) S/C SWITCH NO.2 SIGNAL CIRCUIT SHORTED TO THE (V937) SWITCH RETURN CIRCUIT
Measure the resistance between the (V38) S/C Switch No.2 Signal cir-
cuit and the (V937) Switch Return circuit 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 (V38) S/C Switch No.2 Signal circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 13
13.
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 do you 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 14
9 - 774
ENGINE ELECTRICAL DIAGNOSTICS
HB
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