Jeep Grand Cherokee WK. Manual — part 1020
P0591-SPEED CONTROL SWITCH 2 PERFORMANCE (CONTINUED)
12.
(V372) S/C SWITCH NO.2 SIGNAL CIRCUIT SHORTED TO THE (V397) SWITCH RETURN CIRCUIT
Measure the resistance between the (V372) S/C Switch No.2 Signal
circuit and the (V397) Switch Return circuit in the Speed Control har-
ness connector.
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 13
13.
(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 14
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ENGINE ELECTRICAL DIAGNOSTICS
WK
P0591-SPEED CONTROL SWITCH 2 PERFORMANCE (CONTINUED)
14.
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
and 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 15
15.
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 - 677
P0592-SPEED CONTROL SWITCH 2 CIRCUIT LOW
9 - 678
ENGINE ELECTRICAL DIAGNOSTICS
WK
P0592-SPEED CONTROL SWITCH 2 CIRCUIT LOW (CONTINUED)
For the Engine circuit diagram (Refer to 9 - ENGINE - SCHEMATICS AND DIAGRAMS).
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
With the ignition key on.
•
Set Condition:
Speed control switch input No.2 is below the minimum acceptable voltage at the PCM. One trip fault.
Possible Causes
(V372) S/C SWITCH NO.2 SIGNAL CIRCUIT SHORTED TO GROUND
(V72) S/C SWITCH NO.2 SIGNAL CIRCUIT SHORTED TO GROUND
(V372) S/C SWITCH NO.2 SIGNAL CIRCUIT SHORTED TO THE (V397) SWITCH RETURN CIRCUIT
(V72) S/C SWITCH NO.2 SIGNAL CIRCUIT SHORTED TO THE (V937) SWITCH RETURN CIRCUIT
SCCM
SPEED CONTROL RESUME/ACCEL SWITCH
SPEED CONTROL ON/OFF SWITCH
PCM
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING).
Diagnostic Test
1.
SPEED CONTROL SWITCH VOLTAGE LOW
NOTE: Do not press any of the Speed Control Switch buttons.
Ignition on, engine not running.
With a scan tool, read the Speed Control voltage.
Is the Speed Control voltage below 1.0 volt?
Yes
>> Go To 2
No
>> Refer to the INTERMITTENT CONDITION Diagnostic Procedure.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
2.
SPEED CONTROL ON/OFF SWITCH
With the scan tool, monitor the Speed Control Switch voltage.
Disconnect the Speed Control On/Off Switch harness connector.
Did the voltage change to above 4.7 volts?
Yes
>> Replace the Speed Control On/Off Switch.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 3
WK
ENGINE ELECTRICAL DIAGNOSTICS
9 - 679
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