Jeep Grand Cherokee WK. Manual — part 1008
P0579-SPEED CONTROL SWITCH 1 PERFORMANCE (CONTINUED)
2.
SPEED CONTROL SWITCH
Turn the ignition off.
Remove and disconnect the Speed Control Switches from the steering wheel per Service Information.
Measure the resistance across each Speed Control Switch.
Monitor the ohmmeter while pressing each function button on each switch.
The following resistance specs are taken between terminals (V371) S/C Switch No.1 Signal and (V397) S/C Switch
Return circuits of the Switch when holding the switch button in the following position
Not pressing any switch - 20.5 kohms
On/Off - 0.47 kohms
Set - 5.49 kohms
Coast - 2.94 kohms
Cancel - 1.24 kohms
Resume/Accel - 15.4 kohms
Does the function on the Speed Control Switches have the correct resistance value?
Yes
>> Go To 3
No
>> Replace the Speed Control Switch that had the incorrect resistance value.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
3.
(V371) S/C SWITCH NO.1 SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE
Disconnect the C3 PCM harness connector.
Disconnect the C3 Steering Column Control Module harness connec-
tor.
Ignition on, engine not running.
Measure the voltage on the (V371) S/C Switch No.1 Signal circuit in
the S/C Switch harness connectors.
Is the voltage above 0 volts?
Yes
>> Repair the short to battery voltage in the (V371) S/C
Switch No.1 Signal circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 4
9 - 628
ENGINE ELECTRICAL DIAGNOSTICS
WK
P0579-SPEED CONTROL SWITCH 1 PERFORMANCE (CONTINUED)
4.
(V71) S/C SWITCH NO.1 SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE
Disconnect the C1 Steering Column Control Module harness connec-
tor per Service Information.
Ignition on, engine not running.
Measure the voltage on the (V71) S/C Switch No.1 Signal circuit in the
C1 SCCM harness connector.
Is the voltage above 0 volts?
Yes
>> Repair the short to battery voltage in the (V71) S/C Switch
No.1 Signal circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 5
5.
STEERING COLUMN CONTROL MODULE
Turn the ignition off.
Measure the resistance of the (V371), (V71) S/C Switch No.1 Signal circuit between the C1 and C3 SCCM con-
nections.
Measure the resistance of the (V397), (V937) Switch Return circuit between the C1 and C3 SCCM connections.
Is the resistance above 5.0 ohms for either reading?
Yes
>> Replace the Steering Column Control Module per Service Information.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 6
WK
ENGINE ELECTRICAL DIAGNOSTICS
9 - 629
P0579-SPEED CONTROL SWITCH 1 PERFORMANCE (CONTINUED)
6.
(V371) S/C SWITCH NO.1 SIGNAL CIRCUIT OPEN
NOTE: The measurement must be taken from both Speed Control
Switch harness connectors.
Measure the resistance of the (V371) S/C Switch No.1 Signal circuit
from the Speed Control Switches to the C3 SCCM harness connector.
Is the resistance below 5.0 ohms for each measurement?
Yes
>> Go To 7
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)
7.
(V71) S/C SWITCH NO.1 SIGNAL CIRCUIT OPEN
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 8
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 - 630
ENGINE ELECTRICAL DIAGNOSTICS
WK
P0579-SPEED CONTROL SWITCH 1 PERFORMANCE (CONTINUED)
8.
(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 connectors to the C3 SCCM harness connector.
Is the resistance below 5.0 ohms for each measurement?
Yes
>> Go To 9
No
>> Repair the open in the (V397) Switch Return circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
9.
(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 10
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 - 631
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