Jeep Wrangler TJ. Manual — part 123
Symptom:
P0581-SPEED CONTROL SWITCH NO.1 HIGH
When Monitored and Set Condition:
P0581-SPEED CONTROL SWITCH NO.1 HIGH
When Monitored:
With the ignition key on. Battery voltage above 10 volts.
Set Condition:
The PCM detects voltage above 4.8 volts in the Speed Control Switch
Signal circuit. One Trip Fault.
POSSIBLE CAUSES
SPEED CONTROL SWITCH VOLTAGE HIGH
SPEED CONTROL SWITCHES
CLOCKSPRING
(V37) S/C SWITCH SIGNAL CIRCUIT SHORTED TO VOLTAGE
(V37) S/C SWITCH SIGNAL CIRCUIT OPEN BETWEEN PCM AND CLOCKSPRING
(K900) SENSOR GROUND CIRCUIT OPEN BETWEEN PCM AND CLOCKSPRING
(V37) S/C SWITCH SIGNAL CIRCUIT OPEN BETWEEN CLOCKSPRING AND S/C SWITCH
(K900) SENSOR GROUND CIRCUIT OPEN BETWEEN CLOCKSPRING AND S/C SWITCH
PCM
TEST
ACTION
APPLICABILITY
1
NOTE: Do not press any of the Speed Control Switch buttons.
Ignition on, engine not running.
With the DRBIII
t, read the Speed Control voltage.
Is the Speed Control voltage above 4.8 volt?
All
Yes
→ Go To 2
No
→ Refer to the INTERMITTENT CONDITION Symptom (Diagnos-
tic Procedure).
Perform POWERTRAIN VERIFICATION TEST VER - 4.
2
Turn the ignition off.
Remove the Speed Control Switches from the steering wheel.
Measure the resistance across each Speed Control Switch.
Monitor the ohmmeter while pressing each function button on each switch.
Resume/Accel - 15,400 ohms
Cancel - 909 +/- 9 ohms
Decel (Coast) - 2940 +/- 30 ohms
On/Off - 0 ohms
Set - 6650 +/- 66 ohms
Does the function on the Speed Control Switches have the correct resistance value?
All
Yes
→ Go To 3
No
→ Replace the Speed Control Switch that had the incorrect resis-
tance value.
Perform POWERTRAIN VERIFICATION TEST VER - 4.
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TEST
ACTION
APPLICABILITY
3
Disconnect the upper and lower 6-way clockspring harness connectors per Service
Information.
Measure the resistance of the (K900) Sensor ground circuit between the upper and
lower 6-way clockspring harness connectors.
Measure the resistance of the (V37) S/C Switch Signal circuit between the upper and
lower 6-way clockspring harness connectors.
Was the resistance above 5.0 ohms for either circuit?
All
Yes
→ Replace the clockspring.
Perform POWERTRAIN VERIFICATION TEST VER - 4.
No
→ Go To 4
4
Connect the Clockspring harness connectors per Service Information.
Disconnect the Speed Control On/Off Switch 2-way harness connector only.
Ignition on, engine not running.
Measure the voltage on the (V37) S/C Switch Signal circuit in the On/Off Switch
2-way connector.
Is the voltage above 5.2 volts?
All
Yes
→ Repair the short to voltage in the (V37) S/C Switch Signal circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 4.
No
→ Go To 5
5
Turn the ignition off.
Disconnect the upper and lower Clockspring harness connectors per Service Infor-
mation.
Disconnect the C3 PCM harness connector.
CAUTION: DO NOT PROBE THE PCM HARNESS CONNECTORS. PROBING
THE PCM HARNESS CONNECTORS WILL DAMAGE THE PCM TERMI-
NALS RESULTING IN POOR TERMINAL TO PIN CONNECTION. INSTALL
MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS.
Measure the resistance of the (V37) S/C Switch Signal circuit from the lower
Clockspring harness connector to the appropriate terminal of special tool #8815.
Is the resistance below 5.0 ohms?
All
Yes
→ Go To 6
No
→ Repair the open in the (V37) S/C Switch Signal circuit between
the PCM and Clockspring.
Perform POWERTRAIN VERIFICATION TEST VER - 4.
6
CAUTION: DO NOT PROBE THE PCM HARNESS CONNECTORS. PROBING
THE PCM HARNESS CONNECTORS WILL DAMAGE THE PCM TERMI-
NALS RESULTING IN POOR TERMINAL TO PIN CONNECTION. INSTALL
MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS.
Measure the resistance of the (K900) Sensor ground circuit from the lower Clock-
spring harness connector to the appropriate terminal of special tool #8815.
Is the resistance below 5.0 ohms?
All
Yes
→ Go To 7
No
→ Repair the open (K900) Sensor ground circuit between the PCM
and Clockspring.
Perform POWERTRAIN VERIFICATION TEST VER - 4.
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DRIVEABILITY - NGC
P0581-SPEED CONTROL SWITCH NO.1 HIGH —
Continued
TEST
ACTION
APPLICABILITY
7
Measure the resistance of the (V37) S/C Switch Signal circuit from the upper
Clockspring harness connector to the On/Off switch harness connector.
Is the resistance below 5.0 ohms?
All
Yes
→ Go To 8
No
→ Repair the open in the (V37) S/C Switch Signal circuit, Clock-
spring to S/C Switch.
Perform POWERTRAIN VERIFICATION TEST VER - 4.
8
Measure the resistance of the (K900) Sensor ground circuit from the On/Off Switch
2-way harness connector to the upper Clockspring harness connector.
Is the resistance below 5.0 ohms?
All
Yes
→ Go To 9
No
→ Repair the open in the (K900) Sensor ground circuit between the
Clockspring and S/C Switch.
Perform POWERTRAIN VERIFICATION TEST VER - 4.
9
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.
If the there are no possible causes remaining, view repair.
All
Repair
Replace and program the Powertrain Control Module per Service
Information.
Perform POWERTRAIN VERIFICATION TEST VER - 4.
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DRIVEABILITY - NGC
P0581-SPEED CONTROL SWITCH NO.1 HIGH —
Continued
Symptom:
P0582-SPEED CONTROL VACUUM SOLENOID CIRCUIT
When Monitored and Set Condition:
P0582-SPEED CONTROL VACUUM SOLENOID CIRCUIT
When Monitored:
Engine running, the speed control switched on and learned, and the
brake pedal is not pressed. No other fault has occured this trip.
Set Condition:
The PCM recognizes an open or short to ground in the speed control
vacuum solenoid control circuit. Cruise will be disabled for the remainder of that key-on
cycle. One Trip fault. Three good trips to clear the MIL.
POSSIBLE CAUSES
SPEED CONTROL SOLENOID OPERATION
(V32) S/C SUPPLY CIRCUIT
SPEED CONTROL VACUUM SOLENOID
(V32) S/C SUPPLY SHORT TO GROUND
(V36) S/C VACUUM SOL CONTROL CIRCUIT SHORTED TO GROUND
(V32) S/C SUPPLY CIRCUIT OPEN
(V36) S/C VACUUM SOL CONTROL CIRCUIT OPEN
(Z901) S/C GROUND CIRCUIT OPEN
PCM
TEST
ACTION
APPLICABILITY
1
Ignition on, engine not running.
With the DRBIII
t, read DTCs and record the related Freeze Frame data.
With the DRBIII
t, actuate the Speed Control Vacuum Solenoid and note operation.
Does the Speed Control Vacuum Solenoid actuate properly?
All
Yes
→ Refer to the INTERMITTENT CONDITION symptom in the
Driveability category.
Perform POWERTRAIN VERIFICATION TEST VER - 4.
No
→ Go To 2
2
Turn the ignition off.
Disconnect the S/C Servo harness connector.
Turn the ignition on.
Using the DRBIII
t, actuate the S/C Vacuum Solenoid.
Using a test light connected to ground, probe the (V30) S/C Brake Switch Output
circuit in the S/C Servo harness connector.
Does the test light illuminate brightly and flash on and off?
All
Yes
→ Go To 5
No
→ Go To 3
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DRIVEABILITY - NGC
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