Code #34 SPEED CONTROL SERVO SOLENOID WHERE IS IT LOCATED

The pressure switch on the master cylinder has nothing to do with the cruise control . The pressure switch as you call it is not a pressure switch at all . Brake fluid level sensor . The brake switch is under the dash on top of the brake pedal linkage (arm) .
Speed Control The vehicle speed control consists of the following components:

• speed control servo (9C735)
• speed control actuator cable (9A825)
• speed control indicator lamp
• speed control actuator switches (9D743)
• brake pedal position (BPP) switch (13480)
• deactivator switch
• anti-lock brake control module (2C018)
• clutch pedal position (CPP) switch
• Self-Test Diagnostics
  WARNING: This test is a key on engine off (KOEO) test only that is conducted in PARK only with parking brake fully engaged.
  
  • Enter Self-Test Diagnostics by depressing the speed control OFF switch while turning the ignition key ON, making sure the engine does not start and is not running. The speed control indicator lamp on the instrument panel will flash once to indicate that the speed control module entered the diagnostic mode.
  NOTE: Five additional flashes at this point indicate a defective speed control servo. Release the OFF switch.
  
  • Release the OFF switch.
  • NOTE: If the ON switch is not pressed within five seconds after entering the diagnostic mode, the module times out and the procedure must be started over.
    Press the remaining switches in this sequence: ON, RSM (resume), CST (coast), and SET/ACCEL. The speed control indicator lamp will flash as each switch is pressed. Press each switch in the sequence immediately after the light goes out for the previous switch.
  • A lamp flash with the last button (SET/ACCEL) indicates that the STATIC test passed. If the lamp does not flash with the last button and there are no additional flashes of the lamp, the switch is defective. If the lamp does not flash with the last button, and additional flashes occur, follow the chart below for trouble codes:
    • Two flashes - Brake pedal position (BPP) switch is defective, circuit is defective, or brake pedal is applied; clutch pedal position (CPP) switch is defective, circuit is defective, or clutch pedal is applied.
    • Three flashes - Brake deactivation switch is open or circuit is defective.
    • Four flashes - Vehicle speed signal is out of range or circuit is defective.
  • Immediately after the static test has passed, the speed servo will then carry out a dynamic test automatically by actuating the throttle lever from 1mm to 10 mm of travel from the idle position. During the dynamic throttle pull, observe the throttle movement to witness any binding or sticking of actuator cable, correct connection of actuator cable to throttle lever, and make sure the throttle returns back to idle position. If incorrect connection and/or binding or sticking of actuator is observed, go to the Symptom Chart. If dynamic pull at the throttle body is observed, Go To Pinpoint Test A .
  • Return the ignition switch to the OFF position and proceed to the Symptom Chart.
  Symptom Chart

Symptom Chart
NOTE: Self-Test Diagnostics must be carried out before proceeding to the Symptom Chart.
Symptom Chart Condition Possible Sources Action

• Flash code 1 - system pass

• -

• System Pass.

• Flash code 1 - no dynamic pull at throttle body

• Speed control actuator cable.
• Speed control servo.

• GO to Pinpoint Test A .

• Flash code 1 - speed control inoperative

• Circuitry.
• Speed control servo.

• GO to Pinpoint Test D .

• Flash code 2 - BBP switch circuit failure

• Circuitry.
• BPP switch.
• CPP switch or jumper.
• Speed control servo.

• GO to Pinpoint Test B .

• Flash code 3 - deactivator switch

• CJB Fuse 13 (20A).
• Circuitry.
• Deactivator switch.
• Speed control servo.

• GO to Pinpoint Test C .

• Flash code 4 - speed signal circuit failure

• Circuitry.
• Speed control servo.
• Anti-lock brake control module.

• GO to Pinpoint Test D .

• Flash code 5

• Speed control servo.

• INSTALL a new speed control servo. REFER to Actuator - Speed Control Servo . TEST the system for normal operation.

• The speed control is inoperative - no flash codes

• CJB Fuse 10 (7.5A).
• Circuitry.
• BPP switch.
• Speed control actuator switches (9D743).
• Anti-lock brake control module.
• Speed control servo.

• GO to Pinpoint Test E .

• The speed control does not disengage when the clutch is applied

• BPP switch.
• CPP switch (M/T).
• Circuitry.

• GO to Pinpoint Test F .

• The speed control switch is inoperative - COAST

• Speed control actuator switch.
• Speed control servo.

• GO to Pinpoint Test G .

• The speed control switch is inoperative - SET/ACCEL

• Speed control actuator switches.
• Speed control servo.

• GO to Pinpoint Test H .

• The speed control switch is inoperative - RESUME

• Speed control actuator switch.
• Speed control servo.

• GO to Pinpoint Test J .

• The speed control switch is inoperative - OFF

• Speed control actuator switch.
• Speed control servo.

• GO to Pinpoint Test K .

• The speed control indicator lamp is always on

• Circuitry.
• Speed control servo.
• Instrument cluster.

• GO to Pinpoint Test L .

• The speed control indicator is inoperative

• Circuitry.
• Bulb.
• Instrument cluster.
• Speed control servo.

• REFER to Section 413-01 .

• The set speed fluctuates

• Anti-lock brake control module.
• Speed control servo.
• Speed control actuator switch.
• Circuitry.
• Speed control actuator cable.

• GO to Pinpoint Test M .

• Engine (6007).

• REFER to Powertrain Control/Emissions Diagnosis (PC/ED) manual. REPAIR engine as necessary.

Idle air speed controller

0034 code is a turbo charger bypass valve control circuit low it sounds like you have a computer problem did this happen all at once could it have been hit by lighting or may your ground leads are bad

Yes here is that list.
Chrysler products COMMON CODES OBD1 (vehicles made before 1995)
Part 1: Chrysler Domestic vehicles
CODES/Meaning
88 display used for start or test
11 camshaft signal or ignition signal, no reference signal during cranking
12 memory to controller has been cleared within 50-100 engine starts
13 map sensor not detecting any change during test
14 map voltage too high or too low
15 vehicle speed sensor, no signal detected
16 knock sensor circuit. open or short detected
17 low engine temperature, possible thermostat fault
21 oxygen sensor signal, neither rich or lean detected
22 coolant sensor voltage low
23 air charge voltage high/low detected
24 throttle positioner sensor voltage high/low
25 automatic idle speed motor driver circuit, short or open detected
26 injectors 1,2,3 peak current not reached
27 injector control circuit does not respond to control signal
31 purge solenoid circuit, open or short detected
32 egr solenoid circuit, open or short detected
33 a/c clutch relay circuit, open or short detected
34 speed control servo solenoid, open or short detected
35 radiator fan control relay circuit, open or short detected
36 wastegate solenoid, open or short detected
37 part throttle unlock(PTU) circuit, open or short detected
41 charging system circuit not responding to control signal
42 fuel pump or auto shutdown (ASD) relay voltage sensed at controller
43 ignition control circuit not responding
44 battery temperature voltage circuit problem
45 turbo boost limit exceeded-map sensor detects overboost
46 battery voltage too high
47 battery voltage too low
51 air/fuel at limit
52 logic module fault
53 internal controller failure
54 camshaft reference circuit not detected
55 end of message
61 baro read solenoid, open or short detected
62 emr mileage not stored
63 eeprom write denied
64 flex fuel sensor signal out of range
65 manifold tuning valve, open or short detected
66 no ccd messages
76 ballast bypass relay, open or short detected
77 speed control relay, open or short detected

34 = speed control circuit. The solenoid for the speed control is not operating correctly, due to a defective solenoid or short in the wire connection. 55 = end of diagnostic message's.

Hello
Welcome
Code 24 is Throttle Position Sensor,

This is locared on the right side of the throtle body accross from the throtle linkage there is 2 torx screws holding in place and one wire end to disconect install reverse from instructions

code 34 Speed Control Servo Circuit. No check engine light will post.
Your cruse control servo is not turning on and off like it should.
I would do the tps first then disconect the batery for 5 minn then re check the car for codes, the tps might be messing with the speed control servo.
Let me know if i can help more!

A 12 code mean how many times the key-ons have accurred since the last faults were erased.

A 34 code has to do with the S/C Servo Solenoids which means there is a open or shorted condition detected. Would be in the speed control vacuum or vent solenoid circuits.

A 33 code has to do with the A/C Clutch Relay curcuit. Possible problem with a shorted or open in the A/C clutch relay circuit.

A 55 code means there is a completion of the fault code display which is the check engine light.

34 = Speed Control Solenoid Circuits: An Open or Shorted Condition has been detected in the Speed Control Vacuum or Vent Solenoid Circuits.
35 = Radiator Fan Relay Circuit: An Open or Shorted Condition has been detected in the Radiator Fan Relay Circuit.
That 5 at the end should have had another 5 after. Did it? 5-blinks and 5-blinks means the system has finished sending the Codes.

Code 34 is set when the computer does not detect a voltage to and through the speed control servo. The cruise control computer is built into the PCM, which grounds two windings in the servo mechanism to regulate the vacuum applied to the servo diaphragm.
Note: All Chrysler corporation fuel-injected engines have the computer circuitry and software for the cruise control system installed, even if there is no cruise control installed on the vehicle. If there is no cruise control installed on the care or truck, the computer will interpret this as an open winding and set code 34.
First: turn the key ON, turn the cruise switch ON, and look for +12 Volts on the dark blue/red wire that connects to the servo mechanism. This circuit is fed:

• from the ignition switch through to 10 (dark blue wire)
• from fuse 10 to the steering column (white/red wire)
• through the clock spring to the cruise control ON/OFF switch on the steering wheel (white/red wire)
• back through the clockspring to joint connect "C" (yellow/red wire)
• to the brake lamp switch under the dashboard (yellow/red wire)
• through the firewall from the brake switch (dark blue/red wire)
• to the servo (dark blue/red wire) A break anywhere in this path (broken wire, bad brake switch, loose connector, etc.) will interrupt the 12 volt supply to the servo and set a fault code. Work backwards until you locate the break.
  

Turn the key OFF. Unplug the the connector from the servo and measure the servo coil resistances.

• measure the resistance between the servo pin that connects to the tan/red wire and the servo pin that connects to the dark blue/red wire.
• measure the resistance between the servo pin that connects to the light green/red wire and the servo pin that connects to the dark blue/red wire. The resistance in both cases should be above 0 ohms and less than infinity.
  

Disconnect the battery(s). Unplug the 60 pin connector from the PCM and check for continuity between the pcm connector and the servo connector for the tan/red wire (cavity 33) and the light green/red wire (cavity 53).
If no wiring problems are found, check the PCM connectors for corrosion, and reconnect. Reconnect the battery and test the circuit again. If the problem still exists, the PCM is probably bad. NOTE: Personally, if the truck was out of warranty I would try to find for a used servo before buying a new PCM.

CODE 34 Open or shorted condition in the speed control vacuum or vent solenoid circuits.

Can't find any existing Code 76