Dodge Ram Truck 1500-2500-3500. Manual — part 926

P0581-SPEED CONTROL SWITCH 1 CIRCUIT HIGH (3.7L,4.7L) (CONTINUED)

4.

(V37) S/C SWITCH NO.1 SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE

Connect the Clockspring harness connectors per Service Information.

Disconnect the C2 and C3 PCM harness connectors.

Ignition on, engine not running.

Measure the voltage on the (V37) S/C Switch No.1 Signal circuit in the
Speed Control harness connector.

Is the voltage above 5.3 volts?

Yes

>> Repair the short to battery 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.

(V37) S/C SWITCH NO.1 SIGNAL CIRCUIT OPEN BETWEEN PCM AND CLOCKSPRING

Turn the ignition off.

Disconnect the upper and lower Clockspring harness connectors per
Service Information.

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 the lower Clockspring harness connector to the appropriate ter-
minal of special tool #8815.

Is the resistance below 5.0 ohms?

Yes

>> Go To 6

No

>> Repair the open in the (V37) S/C Switch No.1 Signal cir-

cuit between the PCM and Clockspring.

Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)

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ENGINE - ELECTRICAL DIAGNOSTICS - 3.7L/4.7L/5.7L

DR/DH

P0581-SPEED CONTROL SWITCH 1 CIRCUIT HIGH (3.7L,4.7L) (CONTINUED)

6.

(K900) SENSOR GROUND CIRCUIT OPEN BETWEEN PCM AND CLOCKSPRING

Measure the resistance of the (K900) Sensor ground circuit from the
lower Clockspring harness connector to the appropriate terminal of
special tool #8815.

Is the resistance below 5.0 ohms?

Yes

>> Go To 7

No

>> Repair the open (K900) Sensor ground circuit between the

PCM and Clockspring.

Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)

7.

(V37) S/C SWITCH NO.1 SIGNAL CIRCUIT OPEN BETWEEN CLOCKSPRING AND S/C SWITCH

Measure the resistance of the (V37) S/C Switch No.1 Signal circuit
from the upper Clockspring harness connector to the On/Off switch
harness connector.

Is the resistance below 5.0 ohms?

Yes

>> Go To 8

No

>> Repair the open in the (V37) S/C Switch No.1 Signal cir-

cuit, Clockspring to S/C Switch.

Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)

DR/DH

ENGINE - ELECTRICAL DIAGNOSTICS - 3.7L/4.7L/5.7L

9 - 627

P0581-SPEED CONTROL SWITCH 1 CIRCUIT HIGH (3.7L,4.7L) (CONTINUED)

8.

(K900) SENSOR GROUND CIRCUIT OPEN BETWEEN CLOCKSPRING AND S/C SWITCH

Measure the resistance of the (K900) Sensor ground circuit from the
On/Off Switch 2-way harness connector to the upper Clockspring har-
ness connector.

Is the resistance below 5.0 ohms?

Yes

>> Go To 9

No

>> Repair the open in the (K900) Sensor ground circuit

between the Clockspring and S/C Switch.

Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)

9.

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)

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ENGINE - ELECTRICAL DIAGNOSTICS - 3.7L/4.7L/5.7L

DR/DH

P0581-SPEED CONTROL SWITCH 1 CIRCUIT HIGH (5.7L)

DR/DH

ENGINE - ELECTRICAL DIAGNOSTICS - 3.7L/4.7L/5.7L

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