Dodge Ram Truck 1500-2500-3500. Manual — part 961
P1593-SPEED CONTROL SWITCH 1/2 STUCK (CONTINUED)
4.
(V37) S/C SWITCH NO.1 SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE
Turn the ignition off.
Disconnect the C3 PCM harness connector.
Ignition on, engine not running.
Measure the voltage of the (V37) S/C Switch No.1 Signal circuit in the
S/C Switch harness connector.
Is the voltage above 5.0 volts?
Yes
>> Repair the short to 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
5.
(V38) S/C SWITCH NO.2 SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE
Measure the voltage of the (V38) S/C Switch No.2 Signal circuit in the
S/C Switch harness connector.
Is the voltage above 5.0 volts?
Yes
>> Repair the short to voltage in the (V38) S/C Switch No.2
Signal circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 6
9 - 766
ENGINE - ELECTRICAL DIAGNOSTICS - 3.7L/4.7L/5.7L
DR/DH
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)
DR/DH
ENGINE - ELECTRICAL DIAGNOSTICS - 3.7L/4.7L/5.7L
9 - 767
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 - 768
ENGINE - ELECTRICAL DIAGNOSTICS - 3.7L/4.7L/5.7L
DR/DH
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
DR/DH
ENGINE - ELECTRICAL DIAGNOSTICS - 3.7L/4.7L/5.7L
9 - 769
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