Jeep Grand Cherokee WK. Manual — part 1015
P0585-SPEED CONTROL SWITCH 1/2 CORRELATION (CONTINUED)
3.
SPEED CONTROL RESUME/ACCEL SWITCH
With the scan tool, monitor the Speed Control Switch voltage.
Disconnect the Speed Control Resume/Accel Switch harness connector.
Did the voltage change to above 4.8 volts?
Yes
>> Replace the Speed Control Resume/Accel Switch.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 4
4.
SPEED CONTROL SWITCHES
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 (V372) S/C Switch No.2 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 - 8.87 kohms
Set - 0.825 kohms
Coast - 0.47 kohms
Cancel - 3.92 kohms
Resume/Accel - 1.87 kohms
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 5
No
>> Replace the Speed Control Switch that had the incorrect resistance value.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
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ENGINE ELECTRICAL DIAGNOSTICS
WK
P0585-SPEED CONTROL SWITCH 1/2 CORRELATION (CONTINUED)
5.
S/C SWITCH SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE
Disconnect the C3 PCM harness connector.
Measure the voltage on the (V371) and (V372) S/C Switch Signal cir-
cuits at both Speed Control harness connectors.
Is the voltage above 5.0 volts?
Yes
>> Repair the short to battery voltage in the (V371) or (V372)
S/C Switch Signal circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 6
6.
STEERING COLUMN CONTROL MODULE
Turn the ignition off.
Disconnect the C1 and C3 SCCM harness connectors per Service Information.
Measure the resistance of the (V371/V71) and (V372/V72) S/C Switch Signal circuits between the C1 and C3
SCCM connectors.
Measure the resistance of the (V397/V937) Switch Return circuit between the C1 and C3 SCCM harness connec-
tors.
Is the resistance above 5.0 ohms for any one of the measurements?
Yes
>> Replace the SCCM per Service Information.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 7
NOTE: Connect the Steering Column Control Module harness connectors per Service Information before
continuing.
WK
ENGINE ELECTRICAL DIAGNOSTICS
9 - 657
P0585-SPEED CONTROL SWITCH 1/2 CORRELATION (CONTINUED)
7.
S/C SWITCH 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 (V371/V71) and (V372/V72) S/C Switch
Signal circuits from both Speed Control harness connectors to the
appropriate terminals of special tool #8815.
Is the resistance below 5.0 ohms for each measurement?
Yes
>> Go To 8
No
>> Repair the excessive resistance in the (V371/V71) or
(V372/V72) S/C Switch Signal circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
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ENGINE ELECTRICAL DIAGNOSTICS
WK
P0585-SPEED CONTROL SWITCH 1/2 CORRELATION (CONTINUED)
8.
(V397/V937) SWITCH RETURN CIRCUIT OPEN
NOTE: The measurement must be taken from both Speed Control
Switch harness connectors.
Measure the resistance of the (V397/V937) Switch Return circuit from
both 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 excessive resistance in the (V397/V937) Switch
Return circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
WK
ENGINE ELECTRICAL DIAGNOSTICS
9 - 659
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