Jeep Grand Cherokee WK. Manual — part 1012
P0581-SPEED CONTROL SWITCH 1 CIRCUIT HIGH (CONTINUED)
5.
(V371) S/C SWITCH NO.1 SIGNAL CIRCUIT OPEN
NOTE: The measurement must be taken from both Speed Control
Switch harness connectors.
Turn the ignition off.
Disconnect the C3 SCCM harness connector.
Measure the resistance of the (V371) S/C Switch No.1 Signal circuit
from the S/C Switch harness connectors to the C3 SCCM harness
connector.
Is the resistance below 5.0 ohms?
Yes
>> Go To 6
No
>> Repair the open in the (V371) S/C Switch No.1 Signal cir-
cuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
6.
(V71) S/C SWITCH NO.1 SIGNAL CIRCUIT OPEN
Disconnect the C1 SCCM harness connector
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 (V71) S/C Switch No.1 Signal circuit
from the C1 SCCM harness connector to the appropriate terminal of
special tool #8815.
Is the resistance below 5.0 ohms for both measurements?
Yes
>> Go To 7
No
>> Repair the open in the (V71) S/C Switch No.1 Signal cir-
cuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
9 - 644
ENGINE ELECTRICAL DIAGNOSTICS
WK
P0581-SPEED CONTROL SWITCH 1 CIRCUIT HIGH (CONTINUED)
7.
(V397) SWITCH RETURN CIRCUIT OPEN
NOTE: The measurement must be taken from both Speed Control
Switch harness connectors.
Measure the resistance of the (V397) Switch Return circuit from the
S/C Switch harness connector to the C3 SCCM harness connector.
Is the resistance below 5.0 ohms?
Yes
>> Go To 8
No
>> Repair the open in the (V397) Switch Return circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
8.
(V937) SWITCH RETURN CIRCUIT OPEN
Measure the resistance of the (V937) Switch Return circuit from the
C1 SCCM 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)
WK
ENGINE ELECTRICAL DIAGNOSTICS
9 - 645
P0581-SPEED CONTROL SWITCH 1 CIRCUIT HIGH (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
Take these same voltage measurements with a voltmeter by back probing the (V371) S/C Switch No.1 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 value?
Yes
>> Replace the Speed Control Switch.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 10
10.
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)
9 - 646
ENGINE ELECTRICAL DIAGNOSTICS
WK
P0586-SPEED CONTROL VACUUM CONTROL CIRCUIT
WK
ENGINE ELECTRICAL DIAGNOSTICS
9 - 647
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