1999 DODGE RAM oil temperature

* Governor pressure sensor harness defective.
* Governor pressure/temperature sensor defective.
* Governor pressure sensor signal short to sensor ground
circuit.
* Governor pressure sensor signal circuit short to ground.
* Transmission harness/solenoid assembly defective.
* PCM defective.
* Solenoid pack connector 5-volt supply circuit open.
* Governor pressure sensor ground circuit open.
* Governor pressure sensor signal circuit short to voltage.
* Governor pressure sensor signal circuit open.
Diagnostic Procedures (AB, AN, DN & WJ Bodies)
1) Using scan tool, read DTCs. On AN and DN bodies, go to
next step. On all except AN and DN bodies, if DTC SPECIFIC GOOD TRIPS
counter is not displayed or displayed count is not "0", go to step
11). If DTC SPECIFIC GOOD TRIPS counter is displayed and displayed
count is "0", go to next step.
2) Turn ignition off. Disconnect transmission solenoid
harness connector. Turn ignition on. Measure voltage between ground
and 5-volt supply circuit at transmission solenoid harness connector.
If voltage is 4.5-5.5 volts, go to next step. If voltage is not as
specified, repair open 5-volt supply circuit.
3) Reconnect transmission solenoid harness connector. Using
scan tool, read governor pressure sensor voltage. If voltage is
greater than 4.65 volts, go to test DTC P1763: GOVERNOR PRESSURE
SENSOR VOLTS TOO HIGH. If voltage is 4.65 volts or less, go to next
step.
4) If voltage is less than .12 volt, go to next step. If
voltage is not .12-.80 volt, go to next step. If voltage is not as
specified, go to step 10).
5) Turn ignition off. Disconnect PCM harness connectors.
Disconnect transmission solenoid harness connector. Inspect connectors
and terminals for damage. Repair as necessary. If connector and
terminals are okay, measure resistance between sensor ground circuit
at Black PCM harness connector C1 and governor pressure sensor signal
circuit at White PCM harness connector C2. If resistance is less than
5 ohms, repair governor pressure sensor signal circuit for short to
ground circuit. If resistance is 5 ohms or greater, go to next step.
6) Measure resistance between ground and governor pressure
sensor signal circuit at governor pressure sensor harness connector.
If resistance is less than 5 ohms, repair governor pressure sensor
signal circuit for short to ground. If resistance is 5 ohms or
greater, go to next step.
7) Reconnect transmission solenoid harness connector. Drain
transmission fluid and remove oil pan. Disconnect governor
pressure/temperature sensor harness connector. Inspect connector and
terminals for damage. Repair as necessary. If connector and terminals
are okay, measure resistance between sensor ground circuit at Black
PCM harness connector C1 and governor pressure sensor signal circuit
at White PCM harness connector C2. If resistance is less than 5 ohms,
repair or replace transmission solenoid and harness assembly. If
resistance is 5 ohms or greater, go to next step.
8) Measure resistance between ground and governor pressure
sensor signal circuit at governor pressure sensor harness connector.
If resistance is less than 5 ohms, repair or replace transmission
solenoid and harness assembly. If resistance is 5 ohms or greater, go
to next step.
9) Reconnect all harness connectors except governor
pressure/temperature sensor harness connector. Turn ignition on. Using
scan tool, read governor pressure sensor voltage. If voltage is 4.8
volts or less, replace PCM. If voltage is greater than 4.8 volts,
replace governor pressure sensor.

10) If governor pressure voltage is than .12-.80 volt, go to
next step. If governor pressure voltage is .80 volt or greater, go to
test DTC P1763B: GOVERNOR PRESSURE SENSOR VOLTS TOO HIGH (AN & DN
BODIES).
11) Wiggle wiring harness between PCM and governor pressure
sensor while monitoring governor pressure voltage on scan tool. If
voltage changes while wiggling wiring harness, repair wiring harness
as necessary. If voltage does not change, conditions required to set
DTC P1764 are not present at this time. DTC P1764 sets if governor
pressure sensor input is less than .1 volt for 8.5 seconds. Possible
causes are: PCM internally shorted or open, incorrectly wired, dirty
or corroded connectors or open or shorted wiring. See INACTIVE DTC
CONDITION under SELF-DIAGNOSTIC SYSTEM. Testing is complete.
Diagnostic Procedures (BR Body)
1) Using scan tool, read DTCs. If DTC SPECIFIC GOOD TRIPS
counter is not displayed or displayed count is not "0", go to step
23). If DTC SPECIFIC GOOD TRIPS counter is displayed and displayed
count is "0", go to next step.
2) Turn ignition off. Disconnect transmission solenoid
harness connector. Inspect connector and terminals for damage. Repair
as necessary. If connector and terminals are okay, turn ignition on.
Measure voltage between ground and 5-volt supply circuit at
transmission solenoid harness connector. If voltage is 4.5-5.5 volts,
go to next step. If voltage is not as specified, repair open 5-volt
supply circuit.
3) Reconnect transmission solenoid harness connector. Using
scan tool, read governor pressure sensor voltage. If voltage is
greater than 4.65 volts, go to step 9). If voltage is less than .12
volt, go to next step. If voltage is not .12-.80 volt, go to step 23).
If voltage is .80-4.65 volts, go to step 16).
4) Check and record freeze frame data to determine conditions
which set code. Turn ignition off. Disconnect PCM harness connectors.
Disconnect transmission solenoid harness connector. Inspect connector
and terminals for damage. Repair as necessary. If connector and
terminals are okay, measure resistance between sensor ground circuit
at Black PCM harness connector C1 and governor pressure sensor signal
circuit at White PCM harness connector C2. If resistance is less than
5 ohms, repair governor pressure sensor signal circuit for short to
ground circuit. If resistance is 5 ohms or greater, go to next step.
5) Measure resistance between ground and governor pressure
sensor signal circuit at White PCM harness connector C2. If resistance
is less than 5 ohms, repair governor pressure sensor signal circuit
for short to ground. If resistance is 5 ohms or greater, go to next
step.
6) Drain transmission fluid and remove oil pan. Disconnect
pressure/temperature sensor harness connector. Inspect connector and
terminals for damage. Repair as necessary. If connector and terminals
are okay, reconnect transmission solenoid harness connector. Measure
resistance between ground circuit and governor pressure sensor signal
circuit at governor pressure sensor harness connector. If resistance
is less than 5 ohms, repair or replace transmission solenoid and
harness assembly. If resistance is 5 ohms or greater, go to next step.
7) Measure resistance between ground and governor pressure
sensor signal circuit at governor pressure sensor harness connector.
If resistance is less than 5 ohms, repair or replace transmission
solenoid and harness assembly. If resistance is 5 ohms or greater, go
to next step.
8) Reconnect all harness connectors except
pressure/temperature sensor harness connector. Turn ignition on. Using
scan tool, read governor pressure sensor voltage. If voltage is 4.8
volts or less, replace PCM. If voltage is greater than 4.8 volts,
replace pressure/temperature sensor.

9) Check and record freeze frame data to determine conditions
which set code. Turn ignition off. Disconnect transmission solenoid
harness connector. Disconnect PCM harness connectors. Inspect
connectors and terminals for damage. Repair as necessary. If connector
and terminals are okay, measure resistance of governor pressure sensor
ground circuit between transmission solenoid harness connector and
Black PCM harness connector C1. If resistance is greater than 5 ohms,
repair open governor pressure sensor ground circuit. If resistance is
5 ohms or less, go to next step.
10) Measure resistance of governor pressure sensor signal
circuit between White PCM harness connector C2 and governor pressure
sensor harness connector. If resistance is greater than 5 ohms, repair
open governor pressure sensor signal circuit. If resistance is 5 ohms
or less, go to next step.
11) Connect a fused jumper wire between fused B+ circuit and
transmission control relay output circuit at transmission relay
connector. Turn ignition on. Measure voltage between ground and
governor pressure signal circuit at White PCM harness connector C2. If
voltage is greater than one volt, repair governor pressure signal
circuit for short to voltage. If voltage is one volt or less, go to
next step.
12) Drain transmission fluid and remove oil pan. Disconnect
pressure/temperature sensor harness connector. Inspect connector and
terminals for damage. Repair as necessary. If connector and terminals
are okay, reconnect transmission solenoid harness connector. Carefully
connect a fused jumper wire between ground circuit and governor
pressure signal circuit at governor pressure sensor harness connector.
Turn ignition on. Using scan tool, read governor pressure sensor
voltage. If voltage is .1 volt or less, replace pressure/temperature
sensor. If voltage is greater than .1 volt, go to next step.
13) Measure resistance of governor pressure sensor signal
circuit between White PCM harness connector C2 and governor pressure
sensor harness connector. If resistance is greater than 5 ohms, repair
or replace transmission solenoid and harness assembly. If resistance
is 5 ohms or less, go to next step.
14) Measure resistance of governor pressure sensor ground
circuit between Black PCM harness connector C1 and governor pressure
sensor harness connector. If resistance is greater than 5 ohms, repair
or replace transmission solenoid and harness assembly. If resistance
is 5 ohms or less, go to next step.
15) Turn ignition on. Measure voltage between ground and
governor pressure signal circuit at governor pressure sensor harness
connector. If voltage is greater than one volt, repair or replace
transmission solenoid and harness assembly. If voltage is one volt or
less, replace PCM.
16) Turn ignition off. Disconnect PCM harness connectors.
Disconnect transmission solenoid harness connector. Inspect connector
and terminals for damage. Repair as necessary. If connector and
terminals are okay, measure resistance of sensor ground circuit
between Black PCM harness connector C1 and solenoid harness connector.
If resistance is less than 5 ohms, go to next step. If resistance is 5
ohms or greater, repair open in governor pressure sensor ground
circuit.
17) Turn ignition on. Measure voltage between ground and
governor pressure signal circuit at governor pressure sensor harness
connector. If voltage is greater than one volt, repair governor
pressure signal circuit for short to voltage. If voltage is one volt
or less, go to next step.
18) Turn ignition off. Measure resistance of governor
pressure sensor signal circuit between White PCM harness connector C2
and solenoid harness connector. If resistance is greater than 5 ohms,
repair open governor pressure sensor signal circuit. If resistance is
5 ohms or less, go to next step.

19) Turn ignition on. Using scan tool, read governor pressure
sensor voltage. If voltage is 4.65 volts or less, replace PCM. If
resistance is greater than 4.65 volts, go to next step.
20) Turn ignition off. Drain transmission fluid and remove
oil pan. Disconnect pressure/temperature sensor harness connector.
Inspect connector and terminals for damage. Repair as necessary. If
connector and terminals are okay, reconnect transmission solenoid
harness connector. Measure resistance of governor pressure sensor
signal circuit between White PCM harness connector C2 and governor
pressure sensor harness connector. If resistance is greater than 5
ohms, repair or replace transmission solenoid and harness assembly. If
resistance is 5 ohms or less, go to next step.
21) Measure resistance of governor pressure sensor ground
circuit between Black PCM harness connector C1 and governor pressure
sensor harness connector. If resistance is greater than 5 ohms, repair
or replace transmission solenoid and harness assembly. If resistance
is 5 ohms or less, go to next step.
22) Turn ignition on. Measure voltage between ground and
governor pressure signal circuit at governor pressure sensor harness
connector. If voltage is greater than one volt, repair or replace
transmission solenoid and harness assembly. If voltage is one volt or
less, replace pressure/temperature sensor.
23) Check and record freeze frame data to determine
conditions which set code. Conditions required to set DTC P1764 are
not present at this time. Using wiring diagram as a guide, inspect
wiring and connectors. Repair wiring harness as necessary. If wiring
and connectors are okay, go to next step.
24) Using scan tool, clear DTCs. While reading DTCs, wiggle
wiring harness between PCM and governor pressure sensor. If DTC P1764
resets while wiggling wiring harness, repair wiring harness as
necessary. If DTC P1764 does not reset, go next step.
25) DTC P1764 sets if governor pressure sensor input is less
than .1 volt for 8.36 seconds. Possible causes are: PCM internally
shorted or open, incorrectly wired, dirty or corroded connectors or
open or shorted wiring. See INACTIVE DTC CONDITION under SELF-
DIAGNOSTIC SYSTEM. Testing is complete.
DTC P1765: TRANS 12-VOLT SUPPLY RELAY CNTRL CIRCUIT
Circuit Description
Circuit is monitored continuously while key is on. Code sets
if voltage on transmission control relay circuit at PCM is different
than expected voltage for 3 seconds.
Possible Causes
* Generator source circuit open.
* Transmission relay control circuit open.
* Transmission relay control circuit short to ground.
* Transmission control relay wiring harness defective.
* PCM defective.
* Transmission control relay defective.
Diagnostic Procedures
1) Using scan tool, read DTCs. On AN and DN bodies, go to
next step. On all except AN and DN bodies, if DTC SPECIFIC GOOD TRIPS
counter is not displayed or displayed count is not "0", go to step 9).
If DTC SPECIFIC GOOD TRIPS counter is displayed and displayed count is
"0", go to next step.
2) Using scan tool, actuate transmission control relay. If
transmission control relay does not click, go to step 5). If
transmission control relay clicks, go to next step.
3) Wiggle wiring harness between transmission control relay

TRIP COUNTER displays "0", return to appropriate test(s). If DTC
SPECIFIC GOOD TRIP COUNTER displays one or more, repair is complete.
Go to step 9).
3) If coming to this test from a mis-fire DTC test, go step
7). If coming to this test from other than a mis-fire DTC test, use
scan tool to monitor pretest enabling conditions until all conditions
have been met. Once all enabling conditions are met, observe
appropriate monitor for DTC on scan tool and go to next step.
4) Using scan tool, monitor SIMILAR CONDITIONS to attempt to
duplicate conditions that vehicle was operating at when DTC was set.
If conditions can be duplicated, GOOD TRIP COUNTER will change to one
or more. Monitor operation may be observed on scan tool. All specified
enabling conditions for specified DTC must be met before PCM will
operate monitor. Go to next step.
5) Turn ignition off for 10 seconds. Start engine and allow
it to idle for 2 minutes while monitoring scan tool. If STARTS SINCE
SET and DTC SPECIFIC GOOD TRIP COUNTER change to one or more, repair
is complete. Go to step 9). If STARTS SINCE SET and DTC SPECIFIC GOOD
TRIP COUNTER do not change to one or more, go to next step.
6) Using scan tool, read DTCs. If any DTC exists, return to
appropriate test(s). If no other DTC exists, go to next step.
7) Using scan tool, monitor SIMILAR CONDITIONS to attempt to
duplicate conditions that vehicle was operating at when DTC was set.
If conditions can be duplicated, MISFIRE GOOD TRIP COUNTER will change
to one or more. If MISFIRE GOOD TRIP COUNTER changes to one or more,
test is complete. Go to step 9). If MISFIRE GOOD TRIP COUNTER does not
change to one or more, go to next step.
8) Using scan tool, read DTCs. If any DTC exists, return to
appropriate test(s). If no other DTC exists, go to next step.
9) Turn ignition on, with engine off. Using scan tool, erase
DTCs. Turn ignition off. Disconnect scan tool. Test is complete.
REMOVAL & INSTALLATION
GOVERNOR PRESSURE SENSOR, GOVERNOR PRESSURE SOLENOID &
TRANSMISSION FLUID TEMPERATURE SENSOR
NOTE: Transmission fluid temperature sensor is integral with
governor pressure sensor.
Removal
1) Raise and support vehicle. Drain transmission fluid.
Remove transmission oil pan and filter. Disconnect harness connectors
from governor pressure solenoid and sensor.
2) Remove pressure solenoid retainer-to-governor body screws.
Separate solenoid retainer from governor and pull solenoid from
governor body.
3) Remove governor body-to-valve body bolts. Separate
governor body from valve body. Remove governor body and gasket. Remove
retainer clip holding pressure sensor to governor body and remove
pressure sensor.
Installation
1) Clean all gasket surfaces. Lubricate NEW "O" ring with ATF
and install on pressure sensor. Push pressure sensor into governor
body and install retainer clip. Position governor body on valve body
with NEW gasket and install governor body-to-valve body bolts.
2) Lubricate NEW "O" ring with ATF and install on pressure
solenoid. Push solenoid into governor body. Install solenoid retainer.
Reconnect harness connectors to pressure solenoid and sensor. To
complete installation, reverse removal procedure.


F - B ASIC T E STIN G - R W D - G ASO LIN E

1999 D odge P ic ku p R 1500
1999 ENGINE PERFORMANCE
CHRY - Basic Diagnostic Procedures Trucks & RWD Vans
Dakota, Durango, Ram Pickup, Ram Van, Ram Wagon
CAUTION: When battery is disconnected, vehicle computer and memory
systems may lose memory data. Driveability problems may exist
until computer systems have completed a relearn cycle. See
COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION
before disconnecting battery.
INTRODUCTION
The following diagnostic steps will help prevent overlooking
a simple problem. This is also where to begin diagnosis for a no-start
condition.
The first step in diagnosing any driveability problem is
verifying the customer's complaint with a test drive under the
conditions the problem reportedly occurred.
Before entering self-diagnostics, perform a careful and
complete visual inspection. Most engine control problems result from
mechanical breakdowns, poor electrical connections or
damaged/misrouted vacuum hoses. Before condemning the computerized
system, perform each test listed in this article.
NOTE: Perform all voltage tests with a Digital Volt-Ohmmeter (DVOM)\
with a minimum 10-megohm input impedance, unless stated
otherwise in test procedure.
PRELIMINARY INSPECTION & ADJUSTMENTS
VISUAL INSPECTION
Visually inspect all electrical wiring, looking for chafed,
stretched, cut or pinched wiring. Ensure electrical connectors fit
tightly and are not corroded. Ensure vacuum hoses are properly routed
and are not pinched or cut. Inspect air induction system for possible
vacuum leaks.
MECHANICAL INSPECTION
Compression
Ensure battery is fully charged. Warm engine to normal
operating temperature. Disconnect wire at ignition coil to prevent
engine from starting. Check engine compression with all spark plugs
removed and throttle wide open.
Check engine mechanical condition with a compression gauge,
vacuum gauge, or an engine analyzer. See engine analyzer manual for
specific instructions.
COMPRESSION SPECIFICATIONS









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Application Specification
Compression Ratio
Ram Pickup (8.0L) .......................................... 8.4:1\
All Others ................................................. 9.1:1
Normal Compression Pressure .................................... ( 1)

BO DY C O NTR O L C O M PU TE R

1999 D odge P ic ku p R 1500
1999 ACCESSORIES & EQUIPMENT
CHRY - Body Control Computer Tests
Ram Pickup
NOTE: See BODY CONTROL COMPUTER - INTRODUCTION article before
proceeding with following test. Body control computer in RWD
trucks is the Central Timer Module (CTM).
SYMPTOM IDENTIFICATION
IDENTIFYING VEHICLE EQUIPMENT & SYSTEM PROBLEMS
NOTE: For connector terminal identification wiring diagrams, see
BODY CONTROL COMPUTER - INTRODUCTION article.
NOTE: Perform a visual inspection before proceeding with this test.
Ensure battery is fully charged.
1) Connect scan tool to Data Link Connector (DLC). DLC is a
16-pin connector located under left side of dash, to left of steering
wheel. Turn ignition switch to ON position. If scan tool display is
not blank, go to next step. If scan tool display is blank, see
appropriate VEHICLE COMMUNICATIONS article.
2) Using scan tool, select SYSTEM MONITORS, then CCD BUS
TEST. Scan tool will perform a CCD bus test. If scan tool displays BUS
OPERATIONAL, go to next step. If scan tool displays any message except
BUS OPERATIONAL, see appropriate VEHICLE COMMUNICATIONS article.
3) Using scan tool, select READ DTCs. If any Diagnostic
Trouble Codes (fault messages) are present, go to appropriate fault
message. If no fault messages are present, identify customer
complaint. See following list for possible fault messages and customer
complaint symptoms. Problems listed are diagnosed using a scan tool.
These problems may occur separately or in various combinations. When
diagnosing a system with many apparent problems, a sequence of tests
may be required. After repairs, ensure problem(s) or failure(s) have\
been corrected.
CHIME SYSTEM
* CHIME INOPERATIVE - ENGINE TEMPERATURE CRITICAL
* CHIME INOPERATIVE - KEY IN IGNITION & LF DOOR OPEN
* CHIME INOPERATIVE AT ALL TIMES
* CHIME INOPERATIVE WITH EXTERIOR LIGHTS ON
* CHIME INOPERATIVE WITH LOW OIL PRESSURE
* CHIME INOPERATIVE WITH DRIVER DOOR OPEN
DOOR AJAR SYSTEM
* OPEN LEFT DOOR AJAR CIRCUIT
* OPEN RIGHT DOOR AJAR CIRCUIT
* SHORTED LEFT DOOR AJAR CIRCUIT
* SHORTED RIGHT DOOR AJAR CIRCUIT
INSTRUMENT CLUSTER
* ALL GAUGES INOPERATIVE
* ANY CCD CLUSTER WARNING LIGHT INOPERATIVE
* ANY HARD WIRED CLUSTER WARNING LIGHT INOPERATIVE

* ONE GAUGE NOT OPERATING PROPERLY
OVERHEAD CONSOLE CONCERNS
* AVERAGE MPH/FUEL ECON INOPERATIVE OR WRONG (CMTC FAILS TO
RESPOND TO INSTRUMENT CLUSTER DIMMING, DISTANCE TO EMPTY
INOPERATIVE OR WRONG, ELAPSED TIME INOPERATIVE/WRONG, SWITCH
ON CMTC INOPERATIVE, TRIP ODOMETER INOPERATIVE/WRONG)
* CMTC DISPLAY SHOWS FAILED
* CMTC SEGMENTS FAIL TO LIGHT UP
* INCORRECT READING BEYOND +/- 5
* REPAIRING "OC" IN CMTC DISPLAY
* REPAIRING "SC" IN CMTC DISPLAY
POWER DOOR LOCK SYSTEM
* DOOR LOCK SWITCH FAILURE (PDL)
* DOOR UNLOCK SWITCH FAILURE (PDL)
* AUTOMATIC (ROLLING) DOOR LOCKS INOPERATIVE
* DOORS LOCK WITH KEY IN IGNITION & LEFT DOOR OPEN
* ONE OR ALL DOORS FAILING TO LOCK FROM ONE SWITCH (ONE OR ALL
DOORS FAILING TO UNLOCK FROM ONE SWITCH)
* REMOTE KEYLESS ENTRY PROBLEM
VEHICLE THEFT/SECURITY SYSTEM
* DOOR DISARM SWITCH FAILURE
* DOOR LOCK SWITCH FAILURE
* DOOR UNLOCK SWITCH FAILURE
* EEPROM CHECKSUM FAILURE
* INTERNAL ROM TEST FAILURE
* IDENTIFYING VTSS PROBLEMS
WINDSHIELD WIPER SYSTEM
* WIPER PARK SWITCH FAILURE
* INTERMITTENT WIPERS INOPERATIVE
* NO WIPER ACTUATION AFTER WASH BUTTON PUSHED
* WIPER SPEED SENSITIVE FEATURE INOPERATIVE
CHIME SYSTEM
CHIME INOPERATIVE WITH EXTREME COOLANT TEMPERATURE
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 any module connector.
1) Using scan tool, actuate chime. If chime sounds, go to
next step. If chime does not sound, replace Central Timer Module
(CTM). CTM is located under left side of instrument panel.
2) Using scan tool, read Powertrain Control Module (PCM)
DTCs. If no engine coolant temperature related codes exist, go to next
step. If engine coolant temperature related codes exist, see
appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE section.
3) Due to difficult access of coolant temperature sensor, Oil
Pressure Switch (OPS) will be used to verify CCD bus message from PCM.\
Disconnect OPS connector. OPS is located near bottom of distributor.