check engine light DODGE RAM 1999 Service Owner's Manual

VERIFICATION TEST VER-1A after each repair.
CAUTION: Always turn ignition switch to OFF position prior to
disconnecting or connecting any module connector.
1) Clear trouble codes as needed. See BODY CONTROL COMPUTER -
INTRODUCTION article. Using scan tool, read I/O's door unlock switch
status. If scan tool displays RELEASED, system is currently
functioning properly. If scan tool does not display RELEASED, go to
next step.
2) Disconnect left door lock switch connector. If scan tool
displays RELEASED, replace left door lock switch. If scan tool does
not display RELEASED, go to next step.
3) Disconnect right door lock switch connector. If scan tool
displays RELEASED, replace right door lock switch. If scan tool does
not display RELEASED, go to next step.
4) Locate Central Timer Module (CTM). CTM is located under
left side of instrument panel. Disconnect CTM 18-pin connector C2.
Using an external voltmeter, measure voltage between ground and CTM
18-pin connector C2 terminal No. 4 (Orange/Dark Green wire). If
voltage is more than 1.5 volts, repair short to voltage in Orange/Dark
Green wire between CTM and door lock switch. If voltage is 1.5 volts
or less, replace CTM.
IDENTIFYING VTSS PROBLEMS
NOTE: For connector terminal identification and wiring diagrams,
see BODY CONTROL COMPUTER - INTRODUCTION article. Perform
VERIFICATION TEST VER-1A after each repair.
CAUTION: Always turn ignition switch to OFF position prior to
disconnecting or connecting any module connector.
1) Using scan tool, select BODY SYSTEM then VTSS and read
Central Timer Module (CTM) DTCs. If any VTSS DTCs are displayed,
perform appropriate procedure. See VTSS DTC table. If no VTSS DTCs are
displayed, go to next step.
VTSS DTC









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DTC Message Perform
DOOR DISARM SWITCH FAILURE .............. DOOR DISARM SWITCH FAILURE
DOOR LOCK SWITCH FAILURE .................. DOOR LOCK SWITCH FAILURE
DOOR UNLOCK SWITCH FAILURE .............. DOOR UNLOCK SWITCH FAILURE
EEPROM CHECKSUM FAILURE ................................ Replace CTM
INTERNAL ROM TEST FAILURE .............................. Replace CTM









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2) Select VTSS then MONITORS. If scan tool displays, OK TO
RUN, NOT OK TO ARM, PCM has not recorded more than 20 starts. Start
engine 20 times and retest. If message does not change to OK TO ARM,
replace PCM. If scan tool displays NO RESPONSE TO PCM, see appropriate
VEHICLE COMMUNICATIONS article. If scan tool does not display OK TO
RUN, NOT OK TO ARM or NO RESPONSE TO PCM, go to next step.
3) Using scan tool, actuate horn, headlights and VTSS light
to flash. If horn does not sound, go to next step. If headlights do
not flash, go to step 6). If VTSS light does not flash, go to step 9).\
If all function properly, go to step 12).
4) Press horn button. If horn does not sound, go to
appropriate STEERING COLUMN SWITCHES article. If horn sounds, go to
next step.
5) Locate Central Timer Module (CTM). CTM is located behind

1) Start engine, and check booster vacuum hose connections. A
hissing noise indicates a vacuum leak. Repair any vacuum leaks before
proceeding. Stop engine, and shift transmission into Neutral. Pump
brake pedal until all vacuum reserve in booster is depleted.
2) Hold brake pedal under light pressure. If pedal does not
hold firm and falls away, master cylinder may be faulty. Bleed system
using appropriate method, and repeat step 1). See BLEEDING PROCEDURES
under BLEEDING BRAKE SYSTEM.
3) If pedal still does not hold firm, master cylinder is
faulty. If pedal holds firm, start engine and observe pedal height. If
pedal height change is not apparent, power booster or vacuum check
valve is faulty. Install good check valve, and repeat steps 1) and 2).\
If pedal falls away slightly under light pressure and then holds firm,
go to next step .
4) Start engine. Release brake pedal. Increase engine speed
to 1500 RPM. Close throttle and immediately turn off ignition. Wait at
least 90 seconds, and try brake action again. Booster should provide 2
or more vacuum assisted pedal applications. If vacuum assist is not
provided, perform booster and check valve vacuum tests.
POWER BRAKE BOOSTER VACUUM TEST
Connect vacuum gauge to booster check valve using "T"
fitting. Start engine, and run at idle speed for one minute. Clamp
hose shut between vacuum source and check valve. Stop engine, and
observe vacuum gauge. If vacuum drops more than one in. Hg within 15
seconds, booster diaphragm or check valve is faulty.
POWER BRAKE BOOSTER CHECK VALVE TEST
Disconnect vacuum hose from check valve. Remove check valve
and valve seal from booster. Use a hand-operated vacuum pump for
testing. Apply 15-20 in. Hg at large end of check valve. Vacuum should
hold steady. If gauge on pump indicates vacuum loss, check valve is
faulty and should be replaced.
COMBINATION VALVE METERING VALVE TEST
Metering valve operation can be checked visually with aid of
an assistant. While an assistant applies and releases brake pedal,
observe metering valve stem. If valve is operating correctly, stem
will extend slightly when brakes are applied, and contract when brakes
are released. If valve is faulty, replace combination valve assembly.
COMBINATION VALVE PRESSURE DIFFERENTIAL SWITCH TEST
1) Using an assistant, apply brake pedal. Observe brake
warning light. Raise and support vehicle, and connect a bleed hose to
one rear wheel cylinder. Submerge other end of hose into container
partially filled with brake fluid. Have assistant press and hold brake
pedal down while observing brake warning light. Open bleeder screw. If
warning light glows, switch is operating properly.
2) If warning light fails to glow, check circuit fuse, bulb
and wiring. Repair as necessary. Repeat step 1). If warning light
fails to glow, check brakelight, parking brake switches and related
wiring. Repair as necessary. Repeat step 1). If warning light fails to
glow, pressure differential switch is faulty. Replace combination
valve assembly, and bleed brake system. Verify proper valve operation.
REMOVAL & INSTALLATION

CAUTION: Clutch disc may contain asbestos fibers which can cause
serious health risk. DO NOT sand clutch components. DO NOT
clean components using compressed air. To clean components,
use a water-dampened cloth.
Removal
With transmission and clutch housing removed, mark pressure
plate and flywheel for reassembly reference. Install clutch aligner in
clutch disc to prevent disc from falling. Loosen pressure plate bolts
evenly and in rotation to avoid warping pressure plate. Remove
pressure plate and disc from flywheel. See Fig. 10.
Inspection
1) Check for oil leakage through engine rear main bearing oil
seal and transaxle input shaft seal. Check flywheel and pressure plate
for burned areas, discoloration, cracks, grooves or ridges. Replace as
necessary.
2) Use medium sandpaper (80-180 grade) to clean flywheel
surface, then wipe with mineral spirits. DO NOT flat-machine flywheel
surface. Check facing surfaces for grease or oil contamination. Check
clutch disc for wear. Clutch disc face-to-rivet head distance should
be at least .008" (.20 mm). Check splines of disc hub and transaxle
input shaft.
3) Using straightedge, check pressure plate. Friction area
should be flat to slightly concave, with the inner diameter about 0-.
0039" (0-0.1 mm) less than outer diameter. Using surface plate, check
clutch cover for flatness. Sections around bolt holes should contact
surface plate within .015" (.38 mm). Ensure cover-to-flywheel dowel
fit is snug. Replace clutch assembly as necessary.
NOTE: Before installing clutch disc, ensure flywheel mating
surface, pilot bearing/bushing and clutch release bearing are
in satisfactory condition. Repair and/or replace components
as necessary.
Installation
To install, reverse removal procedure using clutch aligner.
Ensure reference marks are aligned. Tighten pressure plate retaining
bolts evenly a few threads at a time to prevent warpage. See TORQUE
SPECIFICATIONS table.
Fig. 10: Exploded View Of Clutch Assembly (Typical)
Courtesy of Chrysler Corp.
PILOT BEARING, CLUTCH RELEASE BEARING & FORK

scan tool displayed P/N and D/R in correct positions, go to next step.
4) Raise drive wheels and support vehicle, allowing wheels to
spin. Using scan tool, erase DTCs. Start engine. Using scan tool, read
Output Speed Sensor (OSS). Shift transmission into first gear. While
observing scan tool, allow wheels to spin at a speed less than 15 MPH.
If scan tool displays OSS more than 60 RPM, go to next step. If scan
tool displays OSS 60 RPM or less, go to step 7).
5) While wheels are spinning, wiggle wiring between OSS and
PCM. If OSS reading dropped while wiggling, repair intermittent short
or open circuit. Perform TEST VER-5A under VERIFICATION TESTS. If OSS
reading did not drop, go to next step.
6) Using scan tool, erase DTCs. Road test vehicle. Read DTCs.
If FTC P0720 returns, replace PCM. Perform TEST VER-5A under
VERIFICATION TESTS. If FTC P0720 did not return, go to step 13).
7) Turn ignition off. Disconnect PCM. Inspect connectors.
Clean or repair as necessary. Using an ohmmeter, measure resistance
between ground and OSS signal circuit at PCM connector C2, terminal
No. 28 (Light Green/Black wire on Ram Pickup; Light Green/White wire
on all other models). If resistance is less than 5 ohms, repair short
to ground. Perform TEST VER-5A under VERIFICATION TESTS.
8) Using an ohmmeter, measure resistance between ground and
OSS ground circuit at PCM connector C2, terminal No. 25 (Dark
Blue/Black wire). If resistance is less than 5 ohms, repair short to
ground. Perform TEST VER-5A under VERIFICATION TESTS. If resistance is
5 ohms or more, go to next step.
9) Disconnect OSS. Using an ohmmeter, measure resistance
across OSS terminals. If resistance is not 300-1200 ohms, replace OSS.
Perform TEST VER-5A under VERIFICATION TESTS. If resistance is 300-
1200 ohms, go to next step.
10) Using an ohmmeter, measure resistance of OSS signal
circuit between PCM connector C2, terminal No. 28 and OSS connector
(Light Green/Black wire on Ram Pickup; Light Green/White wire on all
other models). If resistance is more than 5 ohms, repair open circuit.
Perform TEST VER-5A under VERIFICATION TESTS. If resistance is 5 ohms
or less, go to next step.
11) Using an ohmmeter, measure resistance of OSS ground
circuit between PCM connector C2, terminal No. 25 and OSS connector
(Dark Blue/Black wire). If resistance is more than 5 ohms, repair open\
circuit. Perform TEST VER-5A under VERIFICATION TESTS. If resistance
is 5 ohms or less, go to next step.
12) Reconnect OSS. Using an ohmmeter, measure resistance
between PCM connector C2, terminals No. 25 (Dark Blue/Black wire) and
No. 28 (Light Green/Black wire on Ram Pickup; Light Green/White wire
on all other models). If resistance is 300-1200 ohms, replace PCM.
Perform TEST VER-5A under VERIFICATION TESTS. If resistance is not
300-1200 ohms, go to next step.
13) Inspect wiring and connectors. repair as necessary.
Perform TEST VER-5A under VERIFICATION TESTS. If wiring and connectors
are okay, go to next step.
14) Conditions required to set FTC are not present at this
time. Check freeze frame data to determine conditions when FTC was
set. Raise drive wheels and support vehicle, allowing wheels to spin.
Using scan tool, read OSS. Shift transmission into first gear. While
observing scan tool, allow wheels to spin at a speed less than 15 MPH.
Wiggle wiring between OSS and PCM. If OSS reading dropped while
wiggling, repair intermittent short or open circuit. Perform TEST VER-
5A under VERIFICATION TESTS. If OSS reading did not drop, no problem
is indicated at this time.
FTC P1595: SPEED CONTROL SOLENOID CIRCUITS
Speed Control (S/C) solenoid circuits are monitored when
engine is running, S/C switch is on and battery voltage is more than

next step. If scan tool does not display brake pedal PRESSED and
RELEASED, go to NTC-1: BRAKE SWITCH SENSE.
4) Turn S/C on. On A/T models, move gear selector to Drive.
If scan tool displays park neutral switch D/R, go to next step. If
scan tool does not display park neutral switch D/R, go to FTC P1899:
PARK/NEUTRAL POSITION SWITCH STUCK IN PARK OR IN GEAR under DIAGNOSTIC
TESTS.
5) On all models, using scan tool, actuate S/C vent solenoid.
Using a 12-volt test light, backprobe S/C brake switch output circuit
at S/C servo connector terminal No. 3 (Dark Blue/Red wire). If test
light is illuminated and bright, go to next step. If test light is dim
or is not illuminated, go to NTC-1: BRAKE SWITCH SENSE.
6) Start engine and let idle for one minute. Turn engine off.
Turn ignition on (engine off). Using scan tool, actuate S/C servo
solenoids. If throttle opens and closes, go to NTC-2: CHECKING FOR
SPEED CONTROL DENIED MESSAGE. If throttle does not open and close,
inspect throttle cable and linkage. Check vacuum supply. See VACUUM
SUPPLY under COMPONENT TESTS. Repair as necessary. Perform TEST VER-4A
under VERIFICATION TESTS.
7) While observing scan tool, press CANCEL switch several
times. If scan tool displays PRESSED and RELEASED, go to next step. If
scan tool does not display PRESSED and RELEASED, replace CANCEL
switch. Perform TEST VER-4A under VERIFICATION TESTS.
8) Turn ignition off. Disconnect S/C servo connector. Using
an ohmmeter, check resistance of ground circuit at S/C servo connector
terminal No. 4 (Black wire). If resistance is 5 ohms or more, repair
open ground circuit. Perform TEST VER-4A under VERIFICATION TESTS. If
resistance is less than 5 ohms, go to next step.
9) Reconnect S/C servo connector. Turn ignition and S/C on.
While observing scan tool, press SET switch several times. If scan
tool displays PRESSED and RELEASED, go to next step. If scan tool does
not display PRESSED and RELEASED, replace SET switch. Perform TEST
VER-4A under VERIFICATION TESTS.
10) Turn ignition off. Disconnect S/C servo connector.
Inspect terminals. If any terminal is damaged, pushed out or miswired,
repair as necessary. Perform TEST VER-4A under VERIFICATION TESTS. If
terminals are okay, go to next step.
11) Disconnect S/C servo connector. Disconnect PCM
connectors. Inspect connectors. Clean or repair as necessary. Using an
ohmmeter, check resistance of S/C vacuum solenoid control circuit
between PCM connector C3, terminal No. 4 and S/C servo connector
terminal No. 1 (Tan/Red wire). If resistance is 5 ohms or more, repair\
open circuit. Perform TEST VER-4A under VERIFICATION TESTS. If
resistance is less than 5 ohms, go to next step.
12) Turn S/C on. While observing scan tool, press COAST
switch several times. If scan tool displays PRESSED and RELEASED, go
to next step. If scan tool does not display PRESSED and RELEASED,
replace COAST switch. Perform TEST VER-4A under VERIFICATION TESTS.
13) Using an ohmmeter, check resistance of S/C vent solenoid
control circuit between PCM connector C3, terminal No. 5 and S/C servo
connector terminal No. 2 (Light Green/Red wire). If resistance is 5
ohms or more, repair open circuit. Perform TEST VER-4A under
VERIFICATION TESTS. If resistance is less than 5 ohms, replace S/C
servo. Perform TEST VER-4A under VERIFICATION TESTS.
NTC-1: BRAKE SWITCH SENSE
Possible Causes:
* Ground circuit open.
* Defective brake switch.
* Brake switch sense circuit open or shorted.
* Defective PCM.

(8) - One used on vehicles with light-duty emissions. Two used on 

vehicles with heavy-duty emissions. 

(
9) - Used on vehicles with heavy-duty emissions. 

(
10 ) - Two catalytic converters are required. 

(
11 ) - Four sensors used on vehicles with medium-duty emissions. 

Two sensors used on vehicles with heavy-duty emissions. 










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ABBREVIATIONS
ABBREVIATION DEFINITIONS








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Abbreviation Definition
AIH ................................... Air Intake Heaters
AIH-TS ............................ AIH Temperature Sensor
AP ............................. Air Pump Injection System
AP-CKV .................................... AP Check Valve
AP-RV .................................... AP Relief Valve
BP/EGR ........................... Backpressure EGR System
BP/EGR-BPT ................ BP/EGR Backpressure Transducer
CCV ................................ Crankcase Ventilation
CEC ......................... Computerized Engine Controls
CNG ............................... Compressed Natural Gas
EFI ............................ Electronic Fuel Injection
EGR-CKV .................................. EGR Check Valve
EVAP ............................. Fuel Evaporative System
EVAP-CVV ........................ EVAP Canister Vent Valve
EVAP-LDP ........................ EVAP Leak Detection Pump
EVAP-LDPF ................ EVAP Leak Detection Pump Filter
EVAP-PRRV ............ EVAP Pressure Relief Rollover Valve
EVAP-PSOL ............................ EVAP Purge Solenoid
EVAP-VC .............................. EVAP Vapor Canister
EVAP-VV ........................... EVAP Ventilation Valve
FR ................................... Fillpipe Restrictor
HO2S ................................ Heated Oxygen Sensor
MIL .......................... Malfunction Indicator Light
PCV ....................... Positive Crankcase Ventilation
SFI .................. Sequential Multiport Fuel Injection
SPK ....................................... Spark Controls
SPK-CC ........................... SPK Computer Controlled
TWC ........................ Three-Way Catalytic Converter









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EARLY FUEL EVAPORATION (EFE)
The EFE valve is actuated by either a vacuum actuator or a
bimetal spring (heat-riser type). The EFE valve is closed when engine
is cold. The closed valve restricts exhaust gas flow from the exhaust
manifold. This forces part of the exhaust gas to flow up through a
passage below the carburetor. As the exhaust gas quickly warms the
intake mixture, distribution is improved. This results in better cold
engine driveability, shorter choke periods and lower emissions.
Ensure EFE valve in exhaust manifold is not frozen or rusted
in a fixed position. On vacuum-actuated EFE system, check EFE thermal
vacuum valve and check valve(s). Also check for proper vacuum hose
routing. See Fig. 15.
Fig. 15: Typical Vacuum-Actuated EFE System
Courtesy of General Motors Corp.
EMISSION MAINTENANCE REMINDER LIGHT (EMR) (IF EQUIPPED)

If equipped, the EMR light (some models may use a reminder
flag) reminds vehicle operator that an emission system maintenance is
required. This indicator is activated after a predetermined
time/mileage.
When performing a smog check inspection, ensure EMR indicator
is not activated. On models using an EMR light, light should glow when
ignition switch is turned to ON position and should turn off when
engine is running.
If an EMR flag is present or an EMR light stays on with
engine running, fail vehicle and service or replace applicable
emission-related components. To reset an EMR indicator, refer to
appropriate MAINTENANCE REMINDER LIGHTS in the MAINTENANCE section.
MALFUNCTION INDICATOR LIGHT (MIL)
The Malfunction Indicator Light (MIL) is used to alert
vehicle operator that the computerized engine control system has
detected a malfunction (when it stays on all the time with engine
running). On some models, the MIL may also be used to display trouble
codes.
As a bulb and system check, malfunction indicator light will
glow when ignition switch is turned to ON position and engine is not
running. When engine is started, light should go out.

2) Ensure journal diameter, taper and out-of-round are within
specification. See CRANKSHAFT, MAIN & CONNECTING ROD BEARINGS table
under ENGINE SPECIFICATIONS. Upper main bearings contain oil holes,
while lower bearings installed in main bearing cap do not.
3) Apply light coat of engine oil to threads before
tightening bolt to specification. See TORQUE SPECIFICATIONS table.
Ensure oil clearance and end play are within specification. See
CRANKSHAFT, MAIN & CONNECTING ROD BEARINGS table.
CAUTION: Crankshaft journal grinding should not exceed .012" (.30 mm)
under standard size. DO NOT grind thrust surfaces of No. 3
main bearing. Final paper or cloth polishing after regrind
must be done in same direction as engine rotation.
Thrust Bearing
Thrust bearing is located on No. 3 main bearing. Replace
thrust bearing if crankshaft end play is not within specification. See
CRANKSHAFT, MAIN & CONNECTING ROD BEARINGS table under ENGINE
SPECIFICATIONS.
NOTE: Cylinder bore should be measured at room temperature of 70
F
(21C).
Cylinder Block
1) Check cylinder bore, out-of-round and taper. Measure
cylinder bore diameter below top surface of cylinder bore, middle of
bore and bottom of cylinder bore. Bore cylinder block if bore diameter
is not within specification. See CYLINDER BLOCK table under ENGINE
SPECIFICATIONS.
NOTE: Cylinder block is marked to indicate oversize valve lifters.
See SPECIAL ENGINE MARKS.
2) Check valve lifter bore diameter. Check for scoring. If
scoring exists or lifter bore diameter is not within specification,
ream cylinder block bore for next oversize valve lifter. See VALVE
LIFTERS table under ENGINE SPECIFICATIONS.
ENGINE OILING
ENGINE LUBRICATION SYSTEM
System has a rotor-type oil pump and full-flow oil filter.
Oil is forced by pump through a series of oil passages in engine to
provide lubrication to engine components. Oil is supplied to rocker
assembly through hollow push rods. Push rods are fed oil from lifters.
See Fig. 17 .
Crankcase Capacity
On 3.9L, oil capacity with oil filter is 4.0 qts. (3.8L). On
5.2L and 5.9L, oil capacity with oil filter is 5.0 qts. (4.7L).
Oil Pressure
Oil pressure is 6 psi (.4 kg/cm
) at idle and 30-80 psi (2.1-
5.6 kg/cm) at 3000 RPM with engine at normal operating temperature.


EN G IN E O VER HAU L P R O CED URES - G EN ER AL IN FO RM ATIO N

1999 D odge P ic ku p R 1500
Engine Overhaul Procedures - General Information
ALL PISTON ENGINES
* PLEASE READ THIS FIRST *
Examples used in this article are general in nature and do
not necessarily relate to a specific engine or system. Illustrations
and procedures have been chosen to guide mechanic through engine
overhaul process. Descriptions of processes of cleaning, inspection,
assembly and machine shop practice are included.
Always refer to appropriate engine overhaul article in the
ENGINES section for complete overhaul procedures and specifications
for the vehicle being repaired.
ENGINE IDENTIFICATION
The engine may be identified from its Vehicle Identification
Number (VIN) stamped on a metal tab. Metal tab may be located in
different locations depending on manufacturer. Engine identification
number or serial number is located on cylinder block. Location varies
with manufacturer.
INSPECTION PROCEDURES
* PLEASE READ THIS FIRST *
NOTE: Always refer to appropriate engine overhaul article in the
ENGINES section for complete overhaul procedures and
specifications for the vehicle being repaired.
GENERAL
Engine components must be inspected to meet manufacturer's
specifications and tolerances during overhaul. Proper dimensions and
tolerances must be met to obtain proper performance and maximum engine
life.
Micrometers, depth gauges and dial indicator are used for
checking tolerances during engine overhaul. Magnaflux, Magnaglo, dye-
check, ultrasonic and x-ray inspection procedures are used for parts
inspection.
MAGNETIC PARTICLE INSPECTION
Magnaflux & Magnaglo
Magnaflux is an inspection technique used to locate material
flaws and stress cracks. The part in question is subjected to a strong
magnetic field. The entire part, or a localized area, can be
magnetized. The part is coated with either a wet or dry material that
contains fine magnetic particles.
Cracks which are outlined by the particles cause an
interruption in the magnetic field. The dry powder method of Magnaflux
can be used in normal light. A crack will appear as an obvious bright
line.
Fluorescent liquid is used in conjunction with a blacklight
in a second Magnaflux system called Magnaglo. This type of inspection
demands a darkened room. The crack will appear as a glowing line in
this process. Both systems require complete demagnetizing upon