Dodge Ram Truck 1500-2500-3500. Manual — part 935
P0591-SPEED CONTROL SWITCH 2 PERFORMANCE (CONTINUED)
4.
CLOCKSPRING
Turn the ignition off.
Disconnect the upper and lower clockspring harness connectors per
Service Information.
Measure the resistance of the (V38) S/C Switch No.2 Signal circuit
between the upper and lower clockspring harness connectors.
Measure the resistance of the (V937) Switch Return circuit between
the upper and lower clockspring harness connectors.
Is the resistance above 5.0 ohms?
Yes
>> Replace the Clockspring per Service Information.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 5
NOTE: Connect the Clockspring harness connectors per Service
Information before continuing.
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ENGINE - ELECTRICAL DIAGNOSTICS - 3.7L/4.7L/5.7L
DR/DH
P0591-SPEED CONTROL SWITCH 2 PERFORMANCE (CONTINUED)
5.
(V38) S/C SWITCH NO.2 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 (V38) S/C Switch No.2 Signal circuit
from both Speed Control harness connectors to the appropriate termi-
nal of special tool #8815.
Is the resistance below 5.0 ohms for both measurements?
Yes
>> Go To 6
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)
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 for both measurement?
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)
DR/DH
ENGINE - ELECTRICAL DIAGNOSTICS - 3.7L/4.7L/5.7L
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P0591-SPEED CONTROL SWITCH 2 PERFORMANCE (CONTINUED)
7.
(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 8
8.
(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 (V38) S/C Switch No.2 Sig-
nal circuit and the (V937) Switch Return circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 9
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ENGINE - ELECTRICAL DIAGNOSTICS - 3.7L/4.7L/5.7L
DR/DH
P0591-SPEED CONTROL SWITCH 2 PERFORMANCE (CONTINUED)
9.
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
DR/DH
ENGINE - ELECTRICAL DIAGNOSTICS - 3.7L/4.7L/5.7L
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