Note. For circuit identification and wiring diagram, see WIRING DIAGRAMS article. If Powertrain Control Module (PCM) is replaced, PCM must be reprogrammed. See PROGRAMMING . After each repair procedure has been completed, reconnect all components. Perform POWERTRAIN VERIFICATION TEST VER-4 under VERIFICATION TESTS to ensure system is functioning properly.
Home/Dodge/Cab & Chassis R3500/Dodge Cab & Chassis R3500 (1996-2006)/Repair manual/Testing & Diagnostics/DTC P1597: SPEED CONTROL SWITCH ALWAYS LOW
Contents
Wiring diagrams Section: Testing & Diagnostics- Engine Controls Self-Diagnostics - Diesel: Overview
- Engine Controls Self-Diagnostics - Diesel: Diagnosis
- Engine Controls Self-Diagnostics - Diesel: Component Locations
- Engine Controls Self-Diagnostics - Diesel: Other
- DTC P0112: INTAKE AIR TEMPERATURE SENSOR VOLTAGE TOO LOW
- DTC P0113: INTAKE AIR TEMPERATURE SENSOR VOLTAGE TOO HIGH
- DTC P0117: ENGINE COOLANT TEMPERATURE SENSOR VOLTAGE TOO LOW
- DTC P0118: ENGINE COOLANT TEMPERATURE SENSOR VOLTAGE TOO HIGH
- DTC P0121: ACCELERATOR POSITION SENSOR VOLTS DO NOT AGREE W/IDLE VALID SIGNAL
- DTC P0122: ACCELERATOR POSITION SENSOR SIGNAL VOLTAGE TOO LOW
- DTC P0123: ACCELERATOR POSITION SENSOR SIGNAL VOLTAGE TOO HIGH
- DTC P0125: COOLANT TEMPERATURE RATIONALITY
- DTC P0128: ENGINE IS COLD TOO LONG
- DTC P0168: DECREASED ENGINE PERFORMANCE DUE TOO HIGH INJECTION PUMP FUEL TEMP
- DTC P0177: WATER IN FUEL
- DTC P0178: WATER IN FUEL SENSOR VOLTAGE TOO LOW
- DTC P0180: FUEL INJECTION PUMP TEMPERATURE OUT OF RANGE
- DTC P0181: FUEL INJECTION PUMP FAILURE
- DTC P0215: FUEL INJECTION PUMP CONTROL CIRCUIT
- DTC P0216: FUEL INJECTION PUMP TIMING FAILURE
- DTC P0222: IDLE VALIDATION SIGNALS BOTH LOW
- DTC P0223: IDLE VALIDATION SIGNALS BOTH HIGH (ABOVE 5 V)
- DTC P0230: TRANSFER PUMP CIRCUIT OUT OF RANGE
- DTC P0232: FUEL SHUTOFF SIGNAL VOLTAGE TOO HIGH
- DTC P0234: TURBO BOOST LIMIT EXCEEDED
- DTC P0236: MAP SENSOR TOO HIGH TOO LONG
- DTC P0237: MAP SENSOR VOLTAGE TOO LOW
- DTC P0238: MAP SENSOR VOLTAGE TOO HIGH
- DTC P0251: FUEL INJECTION PUMP MECHANICAL FAILURE FUEL VALVE FEEDBACK CIRCUIT
- DTC P0252: FUEL VALVE SIGNAL MISSING
- DTC P0253: FUEL INJECTION PUMP FUEL VALVE OPEN CIRCUIT
- DTC P0254: FUEL INJECTION PUMP FUEL VALVE CURRENT TOO HIGH
- DTC P0300-0306: MULTIPLE CYLINDER MISFIRE
- DTC P0320: NO CRANK REFERENCE SIGNAL AT PCM
- DTC P0341: CAMSHAFT POSITION SENSOR SIGNAL MISSING
- DTC P0342: CAMSHAFT POSITION SENSOR SUPPLY VOLTAGE TOO LOW
- DTC P0343: CAMSHAFT POSITION SENSOR SUPPLY VOLTAGE TOO HIGH
- DTC P0370: FUEL INJECTION PUMP SPEED/POSITION SENSOR SIGNAL LOST
- DTC P0380: INTAKE AIR HEATER RELAY NO. 1 CONTROL CIRCUIT
- DTC P0381: WAIT TO START LAMP INOPERATIVE
- DTC P0382: INTAKE AIR HEATER RELAY NO. 2 CONTROL CIRCUIT
- DTC P0460: FUEL LEVEL UNIT NO CHANGE OVER MILES
- DTC P0462: FUEL LEVEL SENDING UNIT VOLTS TOO LOW
- DTC P0463: FUEL LEVEL SENDING UNIT VOLTS TOO HIGH
- DTC P0500: NO VEHICLE SPEED SENSOR SIGNAL
- DTC P0501: VEHICLE SPEED SIGNAL RATIONALITY
- DTC P0522: OIL PRESSURE VOLTAGE TOO LOW
- DTC P0523: OIL PRESSURE VOLTAGE TOO HIGH
- DTC P0524: OIL PRESSURE TOO LOW
- DTC P0562: CHARGING SYSTEM VOLTAGE TOO LOW
- DTC P0563: CHARGING SYSTEM VOLTAGE TOO HIGH
- DTC P0601: PCM INTERNAL CONTROLLER FAILURE
- DTC P0602: ECM FUELING CALIBRATION ERROR
- DTC P0606: ECM FAILURE
- DTC P0622: GENERATOR FIELD NOT SWITCHING PROPERLY
- DTC P0645: A/C CLUTCH RELAY CIRCUIT
- DTC P1283: IDLE SELECT SIGNAL INVALID
- DTC P1284: FUEL INJECTOR PUMP BATTERY VOLTAGE OUT-OF-RANGE
- DTC P1285: FUEL INJECTION PUMP CONTROLLER ALWAYS ON
- DTC P1286: ACCELERATOR PEDAL POSITION SENSOR SUPPLY VOLTAGE TOO HIGH
- DTC P1287: FUEL INJECTION PUMP CONTROLLER SUPPLY VOLTAGE LOW
- DTC P1291: NO TEMPERATURE RISE SEEN FROM INTAKE AIR HEATERS
- DTC P1295: ACCELERATOR PEDAL POSITION SENSOR SUPPLY VOLTAGE TOO LOW
- DTC P1388: AUTO SHUTDOWN RELAY CONTROL CIRCUIT
- DTC P1389: NO ASD RELAY OUTPUT VOLTAGE AT PCM
- DTC P1475: AUXILIARY 5 VOLT OUTPUT TOO HIGH
- DTC P1488: AUXILIARY 5 VOLT OUTPUT TOO LOW
- DTC P1492: AMBIENT/BATT TEMPERATURE SENSOR VOLTS TOO HIGH
- DTC P1493: AMBIENT/BATT TEMPERATURE SENSOR VOLTS TOO LOW
- DTC P1594: CHARGING SYSTEM VOLTAGE TOO HIGH
- DTC P1595: SPEED CONTROL SOLENOID CIRCUITS
- DTC P1596: SPEED CONTROL SWITCH ALWAYS HIGH
- DTC P1597: SPEED CONTROL SWITCH ALWAYS LOW
- DTC P1682: CHARGING SYSTEM VOLTAGE TOO LOW
- DTC P1683: SPEED CONTROL PWR RELAY OR S/C 12V DRIVER CIRCUIT
- DTC P1688: INTERNAL FUEL INJECTION PUMP FAILURE
- DTC P1689: NO COMMUNICATION BETWEEN ECM & INJECTION PUMP MODULE
- DTC P1690: FUEL INJECTION PUMP CKP SENSOR DOES NOT AGREE WITH ECM CKP SENSOR
- DTC P1691: FUEL INJECTION PUMP CONTROLLER CALIBRATION ERROR
- DTC P1693: DTC DETECTED IN PCM
- DTC P1693: DTC DETECTED IN COMPANION MODULE
- DTC P1694: NO BUS MESSAGES RECEIVED FROM COMPANION MODULE
- DTC P1696: PCM FAILURE EEPROM WRITE DENIED
- DTC P1698: NO BUS MESSAGES RECEIVED FROM PCM
- DTC P1899: PARK/NEUTRAL SWITCH STUCK IN PARK OR IN GEAR
- Engine System Testing & Engine Component Testing - Ram Pickup - Diesel: Diagnosis
- Engine System Testing & Engine Component Testing - Ram Pickup - Diesel: Other
- Engine Controls - Trouble Shooting - No Codes - Diesel: Diagnosis
- Engine Controls - Trouble Shooting - No Codes - Diesel: Other
- Engine Controls - Basic Diagnostic Procedures - Trucks - Diesel: Diagnosis
- Engine Controls - Basic Diagnostic Procedures - Trucks - Diesel: Other
- Engine Controls Self-Diagnostics - Gasoline: Overview
- Engine Controls Self-Diagnostics - Gasoline: Diagnosis
- Engine Controls Self-Diagnostics - Gasoline: Component Locations
- Engine Controls Self-Diagnostics - Gasoline: Other
- DTC P0031: O2 SENSOR HEATER CIRCUIT LOW 1/1 OR DTC P0032: O2 SENSOR HEATER CIRCUIT HIGH 1/1
- DTC P0037: O2 SENSOR HEATER CIRCUIT LOW 1/2 OR DTC P0038: O2 SENSOR HEATER CIRCUIT HIGH 1/2
- DTC P0051: O2 SENSOR HEATER CIRCUIT LOW 2/1 OR DTC P0052: O2 SENSOR HEATER CIRCUIT HIGH 2/1
- DTC P0071: AMBIENT TEMP SENSOR PERFORMANCE
- DTC P0107: MAP SENSOR VOLTAGE TOO LOW
- DTC P0108: MAP SENSOR VOLTAGE TOO HIGH
- DTC P0111: INTAKE AIR TEMP PERFORMANCE
- DTC P0112: INTAKE AIR TEMP SENSOR VOLTAGE LOW
- DTC P0113: INTAKE AIR TEMP SENSOR VOLTAGE HIGH
- DTC P0117: ECT SENSOR VOLTAGE TOO LOW
- DTC P0118: ECT SENSOR VOLTAGE TOO HIGH
- DTC P0122: THROTTLE POSITION SENSOR VOLTAGE LOW
- DTC P0123: THROTTLE POSITION SENSOR VOLTAGE HIGH
- DTC P0125 : CLOSED LOOP TEMP NOT REACHED
- DTC P0131: 1/1 O2 SENSOR SHORTED TO GROUND
- DTC P0132: 1/1 O2 SENSOR SHORTED TO VOLTAGE
- DTC P0133: 1/1 O2 SENSOR SLOW RESPONSE
- DTC P0135: 1/1 O2 SENSOR HEATER FAILURE
- DTC P0136: 1/2 O2 SENSOR HEATER CIRCUIT MALFUNCTION
- DTC P0137: 1/2 O2 SENSOR SHORTED TO GROUND
- DTC P0138: 1/2 O2 SENSOR SHORTED TO VOLTAGE
- DTC P0139: 1/2 O2 SENSOR SLOW RESPONSE
- DTC P0141: 1/2 O2 SENSOR HEATER FAILURE
- DTC P0143: 1/3 O2 SENSOR SHORTED TO GROUND
- DTC P0144: 1/3 O2 SENSOR SHORTED TO VOLTAGE
- DTC P0145: 1/3 O2 SENSOR SLOW RESPONSE
- DTC P0147: 1/3 O2 SENSOR HEATER PERFORMANCE
- DTC P0151: 2/1 O2 SENSOR SHORTED TO GROUND
- DTC P0152: 2/1 O2 SENSOR SHORTED TO VOLTAGE
- DTC P0153: 2/1 O2 SENSOR SLOW RESPONSE
- DTC P0155: 2/1 O2 SENSOR HEATER FAILURE
- DTC P0157: 2/2 O2 SENSOR SHORTED TO GROUND
- DTC P0158: 2/2 O2 SENSOR SHORTED TO VOLTAGE
- DTC P0159: 2/2 O2 SENSOR SLOW RESPONSE
- DTC P0161: 2/2 O2 SENSOR HEATER FAILURE
- DTC P0171: 1/1 FUEL SYSTEM LEAN
- DTC P0172: 1/1 FUEL SYSTEM RICH
- DTC P0174: 2/1 FUEL SYSTEM LEAN
- DTC P0175: 2/1 FUEL SYSTEM RICH
- DTC P0201: INJECTOR #1 CONTROL CIRCUIT
- DTC P0202: INJECTOR #2 CONTROL CIRCUIT
- DTC P0203: INJECTOR #3 CONTROL CIRCUIT
- DTC P0204: INJECTOR #4 CONTROL CIRCUIT
- DTC P0205: INJECTOR #5 CONTROL CIRCUIT
- DTC P0206: INJECTOR #6 CONTROL CIRCUIT
- DTC P0207: INJECTOR #7 CONTROL CIRCUIT
- DTC P0208: INJECTOR #8 CONTROL CIRCUIT
- DTC P0209: INJECTOR #9 CONTROL CIRCUIT
- DTC P0210: INJECTOR #10 CONTROL CIRCUIT
- DTC P0300: MULTIPLE CYLINDER MISFIRE
- DTC P0320: NO CRANK REFERENCE SIGNAL AT PCM
- DTC P0340: NO CAM SIGNAL AT PCM
- DTC P0351: IGNITION COIL #1 PRIMARY CIRCUIT
- DTC P0351: IGNITION COIL #1 PRIMARY CIRCUIT (2)
- DTC P0352: IGNITION COIL #2 PRIMARY CIRCUIT
- DTC P0353: IGNITION COIL #3 PRIMARY CIRCUIT
- DTC P0354: IGNITION COIL #4 PRIMARY CIRCUIT
- DTC P0355: IGNITION COIL #5 PRIMARY CIRCUIT
- DTC P0420: 1/1 CATALYTIC CONVERTER EFFICIENCY
- DTC P0432: 2/1 CATALYTIC CONVERTER EFFICIENCY
- DTC P0441: EVAP PURGE FLOW MONITOR
- DTC P0442: EVAP LEAK MONITOR MEDIUM (.040") LEAK DETECTED, DTC P0455: EVAP LEAK MONITOR LARGE LEAK DETECTED OR DTC P0456: EVAP LEAK MONITOR SMALL (.020") LEAK DETECTED
- DTC P0443: EVAP PURGE SOLENOID CIRCUIT
- DTC P0460: FUEL LEVEL UNIT NO CHANGE OVER MILES OR DTC P0461: FUEL LEVEL UNIT NO CHANGE OVER TIME
- DTC P0462: FUEL LEVEL SENDING UNIT VOLTS TOO LOW
- DTC P0463: FUEL LEVEL SENDING UNIT VOLTS TOO HIGH
- DTC P0500: NO VEHICLE SPEED SENSOR SIGNAL
- DTC P0505: IDLE AIR CONTROL MOTOR CIRCUITS
- DTC P0601: PCM INTERNAL CONTROLLER FAILURE
- DTC P0622: GENERATOR FIELD NOT SWITCHING PROPERLY
- DTC P0645: A/C CLUTCH RELAY CIRCUIT
- DTC P1195: 1/1 O2 SENSOR SLOW DURING CATALYST MONITOR
- DTC P1196: 2/1 O2 SENSOR SLOW DURING CATALYST MONITOR
- DTC P1197: SLOW 1/2 O2S DURING CATALYST MONITOR
- DTC P1281: ENGINE IS COLD TOO LONG
- DTC P1282: FUEL PUMP RELAY CONTROL CIRCUIT
- DTC P1294: TARGET IDLE NOT REACHED
- DTC P1296: NO 5 VOLTS TO MAP SENSOR
- DTC P1297: NO CHANGE IN MAP FROM START TO RUN
- DTC P1299: VACUUM LEAK FOUND (IAC FULLY SEATED)
- DTC P1388: AUTO SHUTDOWN RELAY CONTROL CIRCUIT
- DTC P1389: NO ASD RELAY OUTPUT VOLTAGE AT PCM
- DTC P1391: INTERMITTENT LOSS OF CMP OR CKP (3.9L, 5.2L & 5.9L)
- DTC P1391: INTERMITTENT LOSS OF CMP OR CKP (8.0L)
- DTC P1398: MISFIRE ADAPTIVE NUMERATOR AT LIMIT
- DTC P1486: EVAP LEAK MONITOR PINCHED HOSE FOUND
- DTC P1492: AMBIENT/BATT TEMP SEN VOLTS TOO HIGH
- DTC P1493: AMBIENT/BATT TEMP SEN VOLTS TOO LOW
- DTC P1494: LEAK DETECTION PUMP SW OR MECHANICAL FAULT
- DTC P1495: LEAK DETECTION PUMP SOLENOID CIRCUIT
- DTC P1594: CHARGING SYSTEM VOLTAGE TOO HIGH
- DTC P1595: SPEED CONTROL SOLENOID CIRCUITS OR DTC P1683: SPD CTRL PWR RELAY; OR S/C 12V DRIVER CIRCUIT
- DTC P1596: SPEED CONTROL SWITCH ALWAYS HIGH
- DTC P1597: SPEED CONTROL SWITCH ALWAYS LOW
- DTC P1682: CHARGING SYSTEM VOLTAGE TOO LOW
- DTC P1696: PCM FAILURE EEPROM WRITE DENIED
- Engine Controls - Basic Diagnostic Procedures - Gasoline: Overview
- Engine Controls - Basic Diagnostic Procedures - Gasoline: Diagnosis
- Engine Controls - Basic Diagnostic Procedures - Gasoline: Other
- Engine System Testing & Engine Component Testing - Ram Pickup, Ram Van & Ram Wagon - Gasoline: Specifications
- Engine System Testing & Engine Component Testing - Ram Pickup, Ram Van & Ram Wagon - Gasoline: Diagnosis
- Engine System Testing & Engine Component Testing - Ram Pickup, Ram Van & Ram Wagon - Gasoline: Other
- Engine Controls - Trouble Shooting - No Codes - Cng & Gasoline: Diagnosis
- Engine Controls - Trouble Shooting - No Codes - Cng & Gasoline: Other
- Abbreviations
- Accessory Drive Belts
- Adjustments
- Airbag
- Anti-Lock/traction Control
- Application
- Automatic Trans
- Auxiliary Emission Control Systems
- Basic Trouble Shooting
- Body, Cab Control Systems
- Brakes
- Charging System
- Check Lists
- Clutches Manual & Hydraulic
- Computer Relearn
- Cruise Control Systems
- Diagnostic Connector Locations
- Differentials & Drive Axles
- Door Locks & Anti-Theft Systems
- Drive Cycles
- Driveline/axles
- Driveshaft & Universal Joints
- DTC Index
- Electrical
- Electrical Component Locations
- Emission Applications
- Engine
- Engine Performance
- Exterior Lights
- Fuses & Circuit Breakers
- Gauges & Instrument Panels
- General Servicing - All Makes
- Headlights
- Heater
- Identification
- Interior/illumination Lights
- Locking Hubs
- Manual & Power Steering
- Manual HVAC System
- Manual Trans
- Mechanical
- Mechanical - Hydraulic
- Metric Conversions
- Mirrors
- Mode 6
- Removal & Installation
- Reset Procedures
- Restraints
- Seats
- Specifications
- Starter
- Steering
- Steering Column
- Steering Column Switches
- Suspension Front
- Suspension Rear
- Testing & Diagnostics
- Theory & Operation
- Transfer Case
- Transmission
- Warning System
- Wheel Alignment
- Windows
- Wiper/washer Systems
- Wiring System (Data Link Connectors, Pwr Dist., Grnd Dist.)