Jeep Grand Cherokee WK. Manual — part 1052
P1593-SPEED CONTROL SWITCH 1 STUCK (5.7L) (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 connectors.
Is the resistance above 5.0 ohms?
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.
9 - 804
ENGINE ELECTRICAL DIAGNOSTICS
WK
P1593-SPEED CONTROL SWITCH 1 STUCK (5.7L) (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)
WK
ENGINE ELECTRICAL DIAGNOSTICS
9 - 805
P1593-SPEED CONTROL SWITCH 1 STUCK (5.7L) (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)
9 - 806
ENGINE ELECTRICAL DIAGNOSTICS
WK
P1593-SPEED CONTROL SWITCH 1 STUCK (5.7L) (CONTINUED)
9.
S/C SWITCH SIGNAL CIRCUITS SHORTED TO THE (V397/V937) SWITCH RETURN CIRCUIT
Measure the resistance between the (V397) Switch Return circuit and
both of the (V371) and (V372) S/C Switch Signal circuits in the Speed
Control harness connector.
Is the resistance below 5.0 ohms?
Yes
>> Repair the short between the (V397/V937) Switch Return
circuit and the (V371/V71) or (V372/V72) S/C Switch Sig-
nal circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 10
10.
(V371/V71) S/C SWITCH NO.1 SIGNAL CIRCUIT SHORTED
TO THE (V372/V72) S/C SWITCH NO.2 SIGNAL CIRCUIT
Measure the resistance between the (V371/V71) S/C Switch No.1 Sig-
nal circuit and the (V372/72) S/C Switch No.2 Signal circuit at both
Speed Control harness connectors.
Is the resistance below 100 ohms for each circuit?
Yes
>> Repair the short between the (V372/V72) S/C Switch No.2
Signal circuit and the (V371) S/C Switch No.1 Signal cir-
cuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 11
WK
ENGINE ELECTRICAL DIAGNOSTICS
9 - 807
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