Dodge Dakota (R1). Manual — part 873
Symptom:
P1596-SPEED CONTROL SWITCH ALWAYS HIGH
When Monitored and Set Condition:
P1596-SPEED CONTROL SWITCH ALWAYS HIGH
When Monitored:
With the ignition key on.
Set Condition:
An open circuit is detected in the speed control on/off switch circuit. The
circuit must be above 4.8 volts for more than 2 minutes to set the DTC.
POSSIBLE CAUSES
SPEED CONTROL SWITCH GROUND CIRCUIT OPEN CLOCKSPRING TO S/C SWITCH
SPEED CONTROL SWITCH GROUND CIRCUIT OPEN PCM TO CLOCKSPRING
CLOCKSPRING SIGNAL/GROUND CIRCUIT OPEN
S/C WIRING HARNESS OBSERVABLE PROBLEM
SPEED CONTROL ON/OFF SWITCH
SPEED CONTROL SW SIG CKT OPEN PCM TO CLOCK SPRING
SPEED CONTROL SW SIG CKT OPEN CLOCKSPRING TO S/C SWITCH
SPEED CONTROL SWITCH SIGNAL CKT SHORTED TO VOLTAGE
POWERTRAIN CONTROL MODULE
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t in Inputs/Outputs, read the Speed Control inputs state.
While monitoring the DRBIII
t, push the Speed Control On/Off Switch several times,
then leave it on.
Did the DRBIII
t show Speed Control Switch off and on?
All
Yes
→
No
→
2
Turn the ignition off.
Using the Schematics as a guide, inspect the Wiring and Connectors.
Were any problems found?
All
Yes
→
Repair as necessary.
Perform POWERTRAIN VERIFICATION TEST VER - 4.
No
→
Test Complete.
224
SPEED CONTROL
TEST
ACTION
APPLICABILITY
3
Turn the ignition off.
Disconnect the Speed Control On/Off Switch 2-way harness connector.
Disconnect the clockspring 6-way harness connector (S/C switch side)
Note: Check connectors - Clean/repair as necessary.
Measure the resistance of the S/C Switch Sensor Ground Circuit from the On/Off
Switch 2-way harness connector to the clockspring harness connector.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair open ground circuit from clockspring to S/C switch.
Perform POWERTRAIN VERIFICATION TEST VER - 4.
4
Turn the ignition off.
Disconnect the clockspring 6-way harness connector (instrument panel harness side).
Disconnect the PCM harness connector(s).
Note: Check connectors - Clean/repair as necessary.
Measure the resistance of the S/C Switch Sensor Ground Circuit from the PCM
harness connector to the clockspring harness connector.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair open ground circuit from PCM to clockspring.
Perform POWERTRAIN VERIFICATION TEST VER - 4.
5
Turn the ignition off.
Disconnect the Speed Control On/Off Switch 2-way harness connector only.
Note: Check connectors - Clean/repair as necessary.
Measure the resistance across the S/C On/Off Switch.
Is the resistance between 20.3K and 20.7K ohms?
All
Yes
→
No
→
Replace the On/Off Switch.
Perform POWERTRAIN VERIFICATION TEST VER - 4.
6
Turn the ignition off.
Disconnect the upper and lower 6-way clockspring harness connectors.
Note: Check connectors - Clean/repair as necessary.
Measure the resistance of the K4 sensor ground circuit between the upper and lower
6-way clockspring harness connectors.
Measure the resistance of the V37 speed control 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
→
225
SPEED CONTROL
P1596-SPEED CONTROL SWITCH ALWAYS HIGH —
Continued
TEST
ACTION
APPLICABILITY
7
Turn the ignition off.
Disconnect the Speed Control On/Off Switch 2-way harness connector only.
Note: Check connectors - Clean/repair as necessary.
Turn the ignition on.
Measure the S/C Switch Signal Circuit for voltage at the On/Off Switch 2-way
connector.
Is the voltage above 6.0 volts?
All
Yes
→
Repair the Speed Control Switch Signal Circuit for a short to
voltage.
Perform POWERTRAIN VERIFICATION TEST VER - 4.
No
→
8
Turn the ignition off.
Disconnect the Clockspring 6-way harness connector (instrument panel harness side)
.
Disconnect the PCM harness connector.
Note: Check connectors - Clean/repair as necessary.
Using an Ohmmeter, measure the resistance of the S/C Switch Signal Circuit from
the PCM to the Clockspring Connector.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair open Speed Control Switch Signal Circuit PCM to Clock-
spring.
Perform POWERTRAIN VERIFICATION TEST VER - 4.
9
Turn the ignition off.
Disconnect the On/Off switch 2-way harness connector.
Disconnect the upper clockspring harness connector.
Note: Check connectors - Clean/repair as necessary.
Measure the resistance of the S/C Switch Signal Circuit from the clockspring harness
connector to the On/Off switch harness connector.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair the open Speed Control Switch Signal Circuit Clockspring
to S/C switch.
Perform POWERTRAIN VERIFICATION TEST VER - 4.
10
If there are no possible causes remaining, replace the Powertrain Control Module.
View repair options.
All
Repair
Replace and program the Powertrain Control Module in accor-
dance with the Service Information.
Perform POWERTRAIN VERIFICATION TEST VER - 4.
226
SPEED CONTROL
P1596-SPEED CONTROL SWITCH ALWAYS HIGH —
Continued
Symptom:
P1597-SPEED CONTROL SWITCH ALWAYS LOW
When Monitored and Set Condition:
P1597-SPEED CONTROL SWITCH ALWAYS LOW
When Monitored:
With the ignition key on and battery voltage above 10.4 volts.
Set Condition:
When switch voltage is less than 0.39 volts for 2 minutes.
POSSIBLE CAUSES
CLOCKSPRING SHORTED TO GROUND
S/C WIRING HARNESS OBSERVABLE PROBLEM
S/C SWITCH (ON/OFF)
S/C SWITCH (RESUME/ACCEL)
S/C SIGNAL CIRCUIT SHORTED TO SENSOR GROUND
S/C SWITCH SIGNAL CIRCUIT SHORTED TO GROUND
PCM
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t, read the S/C Switch volts status.
Is the S/C Switch voltage below 1.0 volt?
All
Yes
→
No
→
2
Turn the ignition off.
Disconnect the S/C ON/OFF Switch harness connector.
Note: Check connectors - Clean/repair as necessary.
Turn the ignition on.
With the DRBIII
t in Sensors, read the S/C Switch volts.
Did the S/C Switch volts change to 5.0 volts?
All
Yes
→
Replace the S/C ON/OFF Switch.
Perform POWERTRAIN VERIFICATION TEST VER - 4.
No
→
3
Turn the ignition off.
Disconnect the S/C RESUME/ACCEL Switch harness connector.
Note: Check connectors - Clean/repair as necessary.
Ignition on, engine not running.
With the DRBIII
t in Sensors, read the S/C Switch volts.
Did the S/C Switch volts go above 4.0 volts?
All
Yes
→
Replace the Resume/Accel Switch.
Perform POWERTRAIN VERIFICATION TEST VER - 4.
No
→
227
SPEED CONTROL
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