Jeep Grand Cherokee WK. Manual — part 1021
P0592-SPEED CONTROL SWITCH 2 CIRCUIT LOW (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 4.7 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.
STEERING COLUMN CONTROL MODULE
Turn the ignition off.
Disconnect the C1 Steering Column Control Module harness connector (instrument panel wiring side) per Service
Information.
Ignition on, engine not running.
With the scan tool, read the S/C Switch voltage.
Did the S/C Switch volts change to 5.0 volts?
Yes
>> Replace the Steering Column Control Module.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 5
5.
(V372) S/C SWITCH NO.2 SIGNAL CIRCUIT SHORTED TO GROUND
Turn the ignition off.
Connect the C3 Steering Column Control Module harness connectors
per Service Information.
Disconnect the C3 PCM harness connector.
Measure the resistance between ground and the (V372) S/C Switch
No.2 Signal circuit in the S/C Switch harness connectors.
Is the resistance below 100 ohms?
Yes
>> Repair the short to ground in the (V372) S/C Switch No.2
Signal circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 6
9 - 680
ENGINE ELECTRICAL DIAGNOSTICS
WK
P0592-SPEED CONTROL SWITCH 2 CIRCUIT LOW (CONTINUED)
6.
(V72) S/C NO.2 SWITCH SIGNAL CIRCUIT SHORTED TO GROUND
Measure the resistance between ground and the (V72) S/C Switch
No.2 Signal circuit in the C1 SCCM harness connector.
Is the resistance below 100 ohms?
Yes
>> Repair the short to ground in the (V72) S/C Switch No.2
Signal circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 7
7.
(V372) S/C SWITCH NO.2 SIGNAL CIRCUIT SHORTED TO THE (V397) SWITCH RETURN CIRCUIT
Measure the resistance between the (V397) Switch Return circuit and
the (V372) S/C Switch No.2 Signal circuit in the S/C Switch harness
connectors.
Is the resistance below 5.0 ohms?
Yes
>> Repair the short between the (V372) S/C Switch No.2 Sig-
nal circuit and the (V397) Switch Return circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 8
WK
ENGINE ELECTRICAL DIAGNOSTICS
9 - 681
P0592-SPEED CONTROL SWITCH 2 CIRCUIT LOW (CONTINUED)
8.
(V72) S/C SWITCH NO.2 SIGNAL CIRCUIT SHORTED TO THE (V937) S/C SWITCH RETURN CIRCUIT
Measure the resistance between the (V72) S/C Switch No.2 Signal cir-
cuit and the (V937) S/C Switch Return circuit in the C1 SCCM harness
connector.
Is the resistance below 5.0 ohms?
Yes
>> Repair the short between the (V72) S/C Switch No.2 Sig-
nal circuit and the (V937) Switch Return circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 9
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 to1.13 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 (V372) S/C Switch No.2 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 values?
Yes
>> Replace the Speed Control Switch.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 10
9 - 682
ENGINE ELECTRICAL DIAGNOSTICS
WK
P0592-SPEED CONTROL SWITCH 2 CIRCUIT LOW (CONTINUED)
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)
WK
ENGINE ELECTRICAL DIAGNOSTICS
9 - 683
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