Ignition system DODGE RAM 1999 Service Repair Manual

"B" ABBREVIATION TABLE

"B" ABBREVIATION TABLE
ABBREVIATION DEFINITION B/P Backpressure BAC By-Pass Air Control BAP Barometric Absolute Pressure Sensor BARO Barometric BBDC Before Bottom Dead Center BCM Body Control Module BDC Bottom Dead Center BHP Brake Horsepower BLK Black BLU Blue BMAP Barometric & Manifold Absolute Pressure
Sensor BOO Brake On-Off Switch BP Barometric Pressure sensor BPS Barometric Pressure sensor BPT Backpressure Transducer BRN Brown BTDC Before Top Dead Center BTU British Thermal Unit BVSV Bimetallic Switching Valve Baro. Barometric Batt. Battery Bbl. Barrel (Example:4-Bbl.) Blst. Ballast Blwr. Blower Brkr. Breaker

"C" ABBREVIATION TABLE

"C" ABBREVIATION TABLE
ABBREVIATION DEFINITION C Celsius (Degrees) C(3) Computer Controlled Coil Ignition C(4) Computer Controlled Catalytic Converter CANP Canister Purge solenoid CARB California Air Resources Board CAT Catalytic Converter CB Circuit Breaker CBD Closed Bowl Distributor CBVV Carburetor Bowl Vent valve cc Cubic Centimeter CCC Computer Command Control CCD Computer Controlled Dwell CCM Central Control Module CCO Converter Clutch Override CCOT Cycling Clutch Orifice Tube CCW Counterclockwise CDI Capacitor Discharge Ignition CEC Computerized Engine Control CFI Central Fuel Injection CID Cubic Inch Displacement CID Cylinder Identification sensor CIS Continuous Injection System CIS-E Continuous Injection System-Electronic

"C" ABBREVIATION TABLE (con’t)
ABBREVIATION DEFINITION CKT Circuit CLR Clear CNG Compressed Natural Gas CO Carbon Monoxide CO2 Carbon Dioxide CONV Convertible CP Canister Purge CPA Connector Position Assurance CPS Crank Position Sensor CTS Coolant Temperature Sensor CV Check Valve Constant Velocity CVC Constant Vacuum Control CW Clockwise CYL Cylinder Calif. California Carb. Carburetor Chrg. Charging Circ. Circuit Cntrl. Control Comp. Compressor or Compartment Conn. Connector Cont. Continued Conv. Convertible or Converter Cu. In. Cubic Inch Cyl. Cylinder

"D" ABBREVIATION TABLE

"D" ABBREVIATION TABLE


ABBREVIATION DEFINITION "D" Drive DBC Dual Bed Catalyst DC Direct Current or Discharge DDD Dual Diaphragm Distributor DERM Diagnostic Energy Reserve Module DFI Digital Fuel Injection DIC Driver Information Center DIS Direct Ignition System DIS Distributorless Ignition System DIST Distribution DISTR Distributor DK BLU Dark Blue DK GRN Dark Green DME Digital Motor Electronics (Motronic
System) DOHC Double Overhead Cam DOT Department of Transportation DP Dashpot DRB-II Diagnostic Readout Box DVOM Digital Volt/Ohm Meter (see VOM) Def. Defogger or Defroster Def. Defrost Defog. Defogger Diag. Diagnostic Dist. Distributor or Distribution Dr. Door

"E" ABBREVIATION TABLE

“E” ABBREVIATION TABLE
ABBREVIATION DEFINITION EAC Electric Assist Choke _ EACV Electric Air Control Valve _ EBCM Electronic Brake Control Module ECA Electronic Control Assembly ECAT Electronically Controlled Automatic
Transaxle ECM Electronic Control Module ECT Engine Coolant Temperature Sensor ECU Electronic Control Unit or Engine Control
Unit EDF Electric Drive Fan relay assembly EDIS Electronic Distributorless Ignition System EEC Electronic Engine Control EECS Evaporative Emission Control System EEPROM Electronically Erasable PROM EFE Early Fuel Evaporation _ EFI Electronic Fuel Injection _ EGO Exhaust Gas Oxygen sensor (see HEGO) EGR Exhaust Gas Recirculation system _ EGRC EGR Control solenoid or system _ EGRV EGR Vent solenoid or system _ EMR Emission Maintenance Reminder Module ESA Electronic Spark Advance _ ESC Electronic Spark Control _ EST Electronic Spark Timing _ ETR Emergency Tensioning Retractor _ EVAP Fuel Evaporative System _ EVIC Electronic Vehicle Information Center EVO Electronic Variable Orifice _ EVP EGR Valve Position Sensor _ EVR EGR Valve Regulator _ EVRV Electronic Vacuum Regulator Valve Elect. Electronic _ Eng. Engine _ Evap. Evaporative _ Exc. Except _

"F" ABBREVIATION TABLE

"F" ABBREVIATION TABLE
ABBREVIATION DEFINITION F Fahrenheit (Degrees) F/B Fuse Block FBC Feedback Carburetor FI Fuel Injector or Fuel Injection FICD Fast Idle Control Device FIPL Fuel Injector Pump Lever FP Fuel Pump FPM Fuel Pump Monitor FPR-VSV Fuel Pressure Regulator Vacuum Switching
Valve FWD Front Wheel Drive Fed. Federal Ft. Lbs. Foot Pounds

"G" ABBREVIATION TABLE

"G" ABBREVIATION TABLE
ABBREVIATION DEFINITION G grams GND or GRND Ground GRN Green GRY Gray Ga. Gauge Gals. gallons Gov. Governor

"H" ABBREVIATION TABLE

"H" ABBREVIATION TABLE
ABBREVIATION DEFINITION H/D Heavy Duty HAC High Altitude Compensation HC Hydrocarbons HEDF High Speed Electro Drive Fan relay or
circuit HEGO Heated Exhaust Gas Oxygen Sensor HEGOG or HEGO Ground circuit HEI High Energy Ignition HLDT Headlight HO High Output HP High Performance HSC High Swirl Combustion HSO High Specific Output HTR Heater HVAC Heating Headlt. Headlight Hg Mercury Hgt. Height Htr. Heater Hz Hertz (Cycles Per Second)

"I" ABBREVIATION TABLE

"I" ABBREVIATION TABLE
ABBREVIATION DEFINITION I.D. Inside Diameter IAC Idle Air Control IACV Idle Air Control Valve IC Integrated Circuit ID Identification IDM Ignition Diagnostic Monitor IGN Ignition system or circuit ILC Idle Load Compensator In. Hg Inches of Mercury INCH Lbs. Inch Pounds INFL REST Inflatable Restraint INJ Injector or Injection IP Instrument Panel IPC Instrument Panel Cluster

"R" ABBREVIATION TABLE

"R" ABBREVIATION TABLE
ABBREVIATION DEFINITION RABS Rear Anti-Lock Brake System RAC Remote Accessory Control RAM Random Access Memory RAP Retained Accessory Power RECIRC Recirculation RED Red RH Right hand ROM Read Only Memory RPM Revolutions Per Minute RVB Rear Vacuum Break RWAL Rear Wheel Anti-Lock Brake RWD Rear Wheel Drive Recirc. Recirculate or Recirculation Reg. Regulator Rly. Relay

"S" ABBREVIATION TABLE

"S" ABBREVIATION TABLE
ABBREVIATION DEFINITION SAW Spark Angle Word _ SBC Single Bed Converter _ SBEC Single Board Engine Controller _ SC Super Charged _ SCC Spark Control Computer _ SCS Air Suction Control Solenoid _ SDM Supplemental Restraint System Diagnostic Module _ SDU SRS Diagnostic Unit _ SEN Sensor _ SES Service Engine Soon _ SFI Sequential (Port) Fuel Injection _ SIG RTN Signal Return circuit _ SIL Shift Indicator Light _ SIR Supplemental Inflatable Restraint _ SMEC Single Module Engine Controller _ SOHC Single Overhead Cam _ SOL or SoL Solenoid _ SPFI Sequential Port Fuel Injection _ SPK Spark Control _ SPOUT Spark Output Signal _ SRS Supplemental Restraint System (Air Bag) _ SS 3/4-4/3 Shift Solenoid circuit _ SSI Solid State Ignition _ STAR Self-Test Automatic Readout _ STI Self Test Input circuit _ STO Self-Test Output _ SUB-O2 Sub Oxygen Sensor _ Sen. Or Sens. Sensor _ Sol. Solenoid _ Sprchg. Supercharger _ Strg. Steering _ Susp. Suspension _ Sw. Switch _ Sys. System _

"T" ABBREVIATION TABLE

"T" ABBREVIATION TABLE
ABBREVIATION DEFINITION T.V. Throttle Valve _ TAB Thermactor Air By-Pass _ TAC Thermostatic Air Cleaner _ TAD Thermactor Air Diverter _ TAN Tan _ TBI Throttle Body Injection _ TCC Torque Converter Clutch _ TCCS Toyota Computer Control System TDC Top Dead Center _ TDCL Total Diagnostic Communication TFI Thick Film Ignition system _ TGS Top Gear Switch (cancels SIL in THERMAC Thermostatic Air Cleaner _ THS Transmission Hydraulic Switch _ TP/TPS Throttle Position Sensor _ TPI Tuned Port Injection _ TPS Throttle Position Sensor/Switch TS Temperature Sensor _ TSB Technical Service Bulletin _ TTS Transmission Temperature Switch TV Thermovalve _ TWC Three-Way Catalyst _ Temp. Temperature _ Trans. Transaxle/Transmission _

"V" ABBREVIATION TABLE

"V" ABBREVIATION TABLE
ABBREVIATION DEFINITION V Valve _ VAF Vane Air Flow sensor or circuit _ VAPS Variable Assist Power Steering _ VAT Vane Air Temperature _ VATS Vehicle Anti-Theft System _ VBATT Vehicle Battery Voltage _ VCC Viscous Converter Clutch _ VIN Vehicle Identification Number _ VIO Violet _ VLR Volt Loop Reserve _ VM Vacuum Modulator _ VM Vane Meter _ VOM Volt-Ohmmeter (Analog) _ VPWR Vehicle Power supply voltage (10-14 VREF Voltage Reference (ECA supplied ref VRV Vacuum Regulator Valve _ VSC Vehicle Speed Control sensor or sign VSS Vehicle Speed Sensor or signal _ VSV Vacuum Switching Valve _ Vac. Vacuum _ Volt. Voltage _

controls to A/C. Start and operate engine at idle speed.
3) Using an ohmmeter, check for continuity between switch
terminals. Continuity should exist when suction pressure reading is
above 38 psi (2.7 kg/cm
) on Dakota; 43 psi (3.0 kg/cm) on Ram
Pickup. Continuity should not exist when suction pressure reading
drops below 20.5 psi (1.4 kg/cm
) on Dakota; 25 psi (1.8 kg/cm) on
Ram Pickup. If switch is okay, test and repair clutch control circuit
as needed. If switch is not okay, replace faulty clutch cycling
pressure switch.
ELECTRONIC CYCLING CLUTCH SWITCH
Durango
1) Locate electronic cycling clutch switch on thermal
expansion valve in engine compartment. Ensure system pressure is
correct. See A/C SYSTEM PERFORMANCE test. Ensure low pressure cut-out
switch and high pressure cut-out switch are working properly. See
LOW PRESSURE CUT-OUT SWITCH TEST and HIGH PRESSURE CUT-OUT SWITCH
test.
2) Disconnect negative battery cable. Disconnect electronic
cycling clutch switch and high pressure cut-out switch connectors.
Using an ohmmeter, check for continuity in Light Green/White wire
between electronic cycling clutch switch and high pressure cut-out
switch. If continuity exists in Light Green/White wire, go to next
step. If continuity does not exist in Light Green/White wire, repair
wire as necessary.
3) Disconnect low pressure cut-out switch connector. Using an
ohmmeter, check for continuity in Dark Blue/Yellow wire between
electronic cycling clutch switch and low pressure cut-out switch. If
continuity exists in Dark Blue/Yellow wire, go to next step. If
continuity does not exist in Dark Blue/Yellow wire, repair wire as
necessary.
4) Connect low pressure cut-out switch and high pressure cut-
out switch connectors. Connect negative battery cable. Turn ignition
on. Using voltmeter, check for battery voltage at electronic cycling
clutch switch connector terminal No. 2 (White wire). If battery
voltage exists, go to step 6).
5) If battery voltage does not exist, check fuse No. 7 (15-
amp) at junction block located at bottom left of instrument panel. If
fuse is okay, check for short or open in White wire between electronic
cycling clutch switch connector and fuse No. 7 (15-amp) at junction
block.
6) Connect electronic cycling clutch switch connector. Ensure
ambient temperature is between 68-90
F (20-30C). Start engine and
turn A/C on. If compressor clutch cycles 2-3 times per minute, replace
faulty electronic cycling clutch switch. If compressor clutch does not
cycle, check PCM for proper operation. See appropriate G - TESTS
W/CODES article in ENGINE PERFORMANCE section.
HIGH PRESSURE CUT-OUT SWITCH
1) Locate high pressure cut-out switch on compressor
discharge line, near compressor. Ensure system pressure is correct.
See A/C SYSTEM PERFORMANCE test. Disconnect negative battery cable.
Disconnect high pressure cut-off switch connector.
2) Using an ohmmeter, check for continuity between switch
terminals. If continuity exists, test and repair clutch control
circuit as needed. If continuity does not exist, replace faulty
switch.
LOW PRESSURE CUT-OUT SWITCH TEST
Durango

assembly towards right side of vehicle and remove rear A/C-heater
assembly.
5) To install, reverse removal procedure. Ensure all wiring
and hoses are clear and not pinched. Tighten bolts and nuts to
specification. See TORQUE SPECIFICATIONS .
Removal (Ram Pickup - Front)
1) Disconnect negative battery cable. Drain cooling system.
In engine compartment, remove coolant hoses from heater core tubes.
Remove coolant overflow bottle.
2) Discharge A/C system, using approved refrigerant
recovery/recycling equipment. Disconnect refrigerant lines from
evaporator and plug or cover all openings in A/C system. Remove
instrument panel. See INSTRUMENT PANEL. Remove Powertrain Control
Module (PCM) and position aside. DO NOT disconnect 60-pin connector
from PCM.
3) Remove attaching nuts from studs on engine compartment
side of dash panel. Remove defrost duct. Disconnect electrical
connectors. Remove attaching nuts from studs in passenger compartment
side of dash panel. Remove A/C-heater assembly from vehicle. See
Fig. 5 .
4) Place A/C-heater assembly upside-down on work bench.
Remove screw securing floor duct to bottom of A/C-heater assembly and
slide floor duct off of center heat duct adapter. Unsnap center heat
duct adapter from bottom of A/C-heater assembly housing. Remove screw
hidden behind adapter. Remove remaining screws and separate A/C-heater
assembly.
Installation
Ensure mode door pivot pins are properly inserted in holes.
To complete installation, reverse removal procedure.
A/C-HEATER CONTROL PANEL R & I
Removal & Installation (Dakota & Durango)
1) Disconnect negative battery cable. On models equipped with
A/T, unlock ignition switch. Set parking brake and place gear selector
lever in "L" position. If equipped, set tilt steering column in lowest
position.
2) On all models, carefully pry bezel away from instrument
panel to disengage clips. Unplug connectors from cigarette lighter and
auxiliary power outlet. Disconnect fog light switch (if equipped).
Remove A/C-heater control panel screws.
3) Pull control panel outward enough to disconnect wiring
connector, vacuum harness, and temperature control cable. Remove A/C-
heater control panel. To install, reverse removal procedure. Adjust
temperature control cable. See TEMPERATURE CONTROL CABLE ADJUSTMENT .
Removal & Installation (Ram Pickup)
1) Disconnect negative battery cable. Reach under driver's
side of instrument panel, near transmission tunnel and unplug A/C-
heater control panel to A/C-heater assembly vacuum harness connector.
Disconnect vacuum harness from center air duct.
2) On models equipped with A/T, unlock ignition switch. Set
parking brake and place gear selector lever in "L" position. If
equipped, set tilt steering column in lowest position.
3) On all models, remove screw securing cluster bezel to
instrument panel. See Fig. 6. Carefully pry bezel away from instrument
panel to disengage clips. Unplug connectors from cigarette lighter and
auxiliary power outlet.
4) Remove 4 screws attaching A/C-heater control panel. Pull
control panel outward enough to disconnect wiring connector, vacuum
harness and temperature control cable. Remove A/C-heater control


D - A D JU STM EN TS - C NG & G ASO LIN E

1999 D odge P ic ku p R 1500
1999 ENGINE PERFORMANCE
CHRY - On-Vehicle Adjustments - Trucks & RWD Vans - CNG & Gas
Dakota, Durango, Ram Pickup, Ram Van, Ram Wagon
ENGINE MECHANICAL
Before performing any on-vehicle adjustments to fuel or
ignition systems, ensure engine mechanical condition is okay.
VALVE CLEARANCE
NOTE: All engines use hydraulic lifters. No adjustments are
required.
IGNITION TIMING
On all models, ignition timing is controlled by Powertrain
Control Module (PCM). Ignition timing is nonadjustable. DO NOT attempt\
to adjust ignition timing by rotating distributor.
NOTE: On Dakota 3.9L, 5.2L and 5.9L, Durango, Ram Pickup, Ram Van
and Ram Wagon, if distributor is rotated, fuel system
synchronization will be changed. If distributor is removed or
rotated, check fuel system synchronization. See procedures
under FUEL SYSTEM SYNCHRONIZATION under FUEL SYSTEM.
FUEL SYSTEM
FUEL SYSTEM SYNCHRONIZATION
NOTE: Fuel system synchronization is controlled by position of the
distributor. Rotating distributor WILL NOT change ignition
timing, but will change fuel system synchronization. Fuel
system synchronization should be checked anytime distributor
is removed or rotated.
Dakota 3.9L, 5.2L & 5.9L, Durango, Ram Pickup, Ram Van & Ram
Wagon
1) Connect scan tool to Data Link Connector (DLC). DLC is
located below driver's side of instrument panel, near steering column.
See Fig. 1 , 2 or 3.
2) Using scan tool manufacturer's instructions, access SET
SYNC display on scan tool. Following scan tool displays, start engine.
Warm engine to normal operating temperature. Vehicle must be in closed
loop. With engine idling, if scan tool displays IN RANGE along with
0
, this indicates correct distributor location. The degree reading
displayed on scan tool indicates the fuel synchronization, not
ignition timing.
3) If scan tool display is correct, shut engine off. Remove
scan tool. If scan tool does not display IN RANGE along with 0
, go to
next step.
4) If scan tool displays a plus (+) or minus (-) sign next\
to
the degree number, and/or the degree number displayed is not zero,
loosen but DO NOT remove distributor hold-down bolt.
5) Rotate distributor until scan tool displays IN RANGE.
Continue to rotate distributor until a reading as close as possible to

2) Disconnect vacuum line at PCV valve located in valve
cover. Install .185" fixed orifice Air Metering Fitting (6714) into
disconnected vacuum line in place of PCV valve.
3) Disconnect purge vacuum hose from passenger's side front
corner of throttle body, next to MAP sensor. Place cap on vacuum hose
fitting on throttle body.
4) Connect scan tool to Data Link Connector (DLC) located
below driver's side of instrument panel, near steering column. See
Fig. 1, 2 or 3.
5) Start engine and warm engine to normal operating
temperature. Using scan tool manufacturer's instructions, select
SYSTEM TEST and then access the MINIMUM AIRFLOW display on scan tool.
When accessed, scan tool will count down to stabilize idle RPM and
display minimum airflow idle RPM. Minimum airflow idle RPM should be
500-900 RPM.
6) Shut engine off. If minimum airflow idle RPM is correct,
throttle body is okay. Go to next step. If minimum airflow idle RPM is
not within specification, using approved cleaner, clean throttle body
and recheck minimum airflow idle RPM. If correct minimum airflow idle
RPM cannot be obtained, replace throttle body. Go to next step.
7) Remove air metering fitting. Reinstall vacuum hoses as
necessary. Reinstall air duct on throttle body. Remove scan tool.
Ram Pickup 8.0L
Throttle body minimum airflow cannot be checked on this
application.
THROTTLE POSITION SENSOR
NOTE: Throttle Position (TP) sensor is nonadjustable. Use following\
procedure to check TP sensor calibration. For complete
testing of TP sensor and wiring circuit, see SELF-DIAGNOSTICS
- JEEP, TRUCKS & RWD VANS article.
Dakota, Ram Pickup, Ram Van & Ram Wagon
1) Remove components for access to electrical connector at TP
sensor mounted on throttle body. With electrical connector installed
on TP sensor, turn ignition on with engine off. DO NOT start engine.
2) Using digital volt-ohmmeter, measure voltage at center
terminal on electrical connector for TP sensor with throttle valve
closed (idle position). Voltage should be greater than .35 volt, but
less than .90 volt.
3) Slowly open throttle to full throttle and note voltage
reading. Voltage should smoothly increase to less than 4.50 volts.
Replace TP sensor if voltage is not within specification.