heater DODGE NEON 2000 Service Service Manual

CONNECTOR/GROUND LOCATIONS (RHD)
For items not shown in this section a N/S is placed
in the Fig. column.
Connector
Name/NumberColor Location Fig.
A/C
Compressor
ClutchBK Right Front of
Engine
Compartment20
A/C Cycling
SwitchBK Left Side of
Instrument
PanelN/S
A/C-Heater
Blower MotorBK Left Side of
Instrument
PanelN/S
A/C-Heater
ControlGY Center of
Instrument
Panel24
A/C High
Pressure
SwitchBK Front Center
of Engine
Compartment18, 20
A/C Low
Pressure
SwitchBK Left Rear of
Engine
CompartmentN/S
Airbag Control
ModuleYL Near PRNDL
Lamp T/O25
Back-Up Lamp
Switch (MTX)GY Left Front of
Engine
Compartment19
Blower Motor
Resistor BlockBK T/O Near
Grommet and
C20223
Brake Lamp
SwitchGY Top of Brake
Pedal23
Brake Shift
Interlock
SolenoidWT Right Side of
Instrument
PanelN/S
Brake Warning
Indicator
SwitchBK Rear of
Engine
CompartmentN/S
C101 BK Left Front of
Engine
Compartment19, 21
C102 LT GY Left Front of
Engine
Compartment19, 21
C103 BK Right Side of
Instrument
Panel23, 25,
26Connector
Name/NumberColor Location Fig.
C104 GY Right Side of
Instrument
Panel23, 25,
26
C105 BK Right Kick
Panel23, 29
C106 BK Left Rear of
Engine
Compartment19
C107 BK Near Left
Front Strut
Tower19
C108 BK Left Front of
Engine
Compartment19
C109 BK Right Front
Inner Fender18
C110 BK Left
Headlamp
Opening19
C111 BK Right
Headlamp
Opening20
C201 GY Left Side of
Instrument
Panel25, 33
C202 LT GN Left Side of
Instrument
Panel23, 24,
25
C203 LT GY Left Side of
Instrument
Panel24, 25
C204 RD Left Side of
Instrument
Panel24, 25,
27
C205 GY Right Side of
Instrument
Panel25, 26,
34
C301 RD Left C-Pillar 30
C302 BK Inner Left
Rear Quarter
Panel30
PL8W - 90 CONNECTOR/GROUND LOCATIONS 8W - 90 - 21
DESCRIPTION AND OPERATION (Continued)

(4) Discharge air conditioning system, if equipped.
Refer to Group 24, Heating and Air Conditioning for
procedure.
(5) Disconnect the following: air intake duct at
intake manifold, throttle cables, electrical connectors
from throttle body and air cleaner housing.
(6) Remove air cleaner housing assembly.
(7) Remove upper radiator hose and fan module.
Refer to Group 7, Cooling System for procedure.
(8) Remove lower radiator hose.
(9) Disconnect automatic transmission cooler lines
and plug, if equipped.
(10) Disconnect shift linkage, electrical connectors,
and clutch cable, if equipped with manual transaxle.
(11) Disconnect engine wiring harness.
(12) Disconnect positive cable from Power Distri-
bution Center (PDC) and ground wire from vehicle
body.
(13) Disconnect ground wire from the vehicle body-
to-engine at the right side strut tower.
(14) Disconnect heater hoses.
(15) Disconnect vacuum hose from brake booster.
(16) Disconnect coolant reserve/recovery hose.
(17) Remove accessory drive belts. Refer to Group
7, Cooling System for procedure.
(18) Remove power steering pump and reservoir
and set them aside.
(19) Hoist vehicle and remove right inner splash
shield.
(20) Drain engine oil.
(21) Remove front wheels.
(22) Remove axle shafts. Refer to Group 3, Differ-
ential and Driveline for procedure.
(23) Disconnect exhaust system from manifold.
(24) Disconnect the downstream oxygen sensor
connector.
(25) Remove lower engine torque strut.
(26) Remove structural collar. Refer to procedure
in this section.
(27) Lower vehicle and remove A/C compressor.
(28) Raise vehicle enough to allow engine dolly
and cradle, Special Tools 6135 and 6710 to be
installed under vehicle.
(29) Loosen engine support posts to allow move-
ment for positioning onto engine locating holes and
flange on the engine bedplate. Lower vehicle and
position cradle until the engine is resting on support
posts (Fig. 26). Tighten mounts to cradle frame. This
will keep support posts from moving when removing
or installing engine and transmission.
(30) Install safety straps around the engine to cra-
dle (Fig. 26). Tighten straps and lock them into posi-
tion.
WARNING: Safety straps MUST be used.(31) Raise vehicle enough to see if straps are tight
enough to hold cradle assembly to engine.
(32) Lower vehicle so weight of the engine and
transmission ONLY is on the cradle assembly.
(33) Remove the upper engine torque strut.
(34) Remove right and left engine and transaxle
mount through bolts (Fig. 24) and (Fig. 25).
(35) Raise vehicle slowly until body is approxi-
mately 15 cm (6 in.) above normal engine mounting
locations.
(36) Remove generator, lower bracket, and upper
mounting bolt.
(37) Continue raising vehicle slowly until engine/
transaxle assembly clears engine compartment. It
may be necessary to move the engine/transmission
assembly with the cradle to allow for removal around
body flanges.
INSTALLATION
(1) Position engine and transmission assembly
under vehicle and slowly lower the vehicle over the
engine/transaxle assembly until vehicle is within 15
cm (6 in.) of engine mounting locations.
(2) Install generator, lower bracket, and adjusting
bolt.
(3) Continue lowering vehicle until engine/tran-
saxle aligns to mounting locations. Install mounting
bolts at the right and left engine/transaxle mounts
(Fig. 24) and (Fig. 25). Tighten bolts to 118 N´m (87
ft. lbs.).
(4) Install upper engine torque strut. Refer to pro-
cedure in this section.
(5) Remove safety straps from engine/transaxle
assembly. Slowly raise vehicle enough to remove the
engine dolly and cradle.
(6) Install axle shafts. Refer to Group 3, Differen-
tial and Driveline for procedure.
(7) Install structural collar. Refer to procedure in
this section tightening sequence.
Fig. 24 Right Mount Through Bolt
1 ± BOLT
2 ± RIGHT ENGINE MOUNT
3 ± ENGINE MOUNT BRACKET
9 - 26 2.0L SOHC ENGINEPL
REMOVAL AND INSTALLATION (Continued)

(8) Install lower engine torque strut. Refer to pro-
cedure in this section.
(9) Connect exhaust system to manifold. Refer to
Group 11, Exhaust System for procedure and torque
specifications.
(10) Connect the downstream oxygen sensor.
(11) Install A/C compressor and hoses. Refer to
Group 24, Heater and Air Conditioning for procedure.
(12) Install accessory drive belts. Refer to Group 7,
Cooling System Accessory Drive Section for belt ten-
sion adjustment.
(13) Install inner splash shield.
(14) Install wheels and lower vehicle.
(15) Install power steering pump and reservoir.
Refer to Group 7, Cooling System Accessory Drive
Section for belt tension adjustment.
(16)Manual Transmission:Connect clutch cable,
reverse light electrical connector and shift linkages.
Refer to Group 6, Clutch.
(17)Automatic Transmission:Connect shifter,
kickdown linkage and cooler lines. Refer to Group 21,
Transaxle for procedures.
(18) Connect fuel line and heater hoses.
(19)
Install all ground straps. Connect engine wiring
harness. Refer to Group 8, Electrical for procedure.
(20) Install lower radiator hose, fan module, and
upper radiator hose. Refer to Group 7, Cooling Sys-
tem for procedures
(21) Fill cooling system. Refer to Group 7, Cooling
System for filling procedure.
(22) Install battery tray and battery.
(23) Install air cleaner housing assembly and con-
nect intake duct to intake manifold.(24) Connect all throttle body electrical connectors
and linkage.
(25) Install oil filter. Fill engine crankcase with
proper oil to correct level.
(26) Perform camshaft and crankshaft timing
relearn procedure as follows:
²Connect the DRB scan tool to the data link
(diagnostic) connector. This connector is located in
the passenger compartment; at the lower edge of
instrument panel; near the steering column.
²Turn the ignition switch on and access the ªmis-
cellaneousº screen.
²Select ªre-learn cam/crankº option and follow
directions on DRB screen.
Fig. 25 Left Mount Through Bolt
1 ± MOUNT BRACKET
2 ± BOLT
3 ± MOUNT
Fig. 26 Positioning Engine Cradle Support Post
1 ± SAFETY STRAPS
2 ± PLACE REAR POSTS INTO LOCATING HOLES
3 ± SPECIAL TOOL 6848
4 ± SPECIAL TOOL 6710
5 ± SPECIAL TOOL 6135
6 ± SAFETY STRAPS
7 ± PLACE FRONT POST UNDER BLOCK FLANGE
PL2.0L SOHC ENGINE 9 - 27
REMOVAL AND INSTALLATION (Continued)

CYLINDER HEAD
REMOVAL
(1) Perform fuel system pressure release procedure
before attempting any repairs.Refer to Group 14,
Fuel System
(2) Disconnect negative battery cable.
(3) Remove power steering/air conditioning drive
belt. Refer to Group 7, Cooling System Accessory
Drive for procedure.
(4) Raise vehicle.
(5) Drain cooling system. Refer to Group 7, Cooling
System.
(6) Remove exhaust pipe from manifold.
(7) Remove right front wheel.
(8) Remove right side splash shield.
(9) Remove generator belt. Refer to Group 7, Cool-
ing System Accessory Drive Belts for procedure.
(10) Remove crankshaft damper. Refer to proce-
dure in this section.
(11) Remove lower torque strut.
(12) Lower vehicle and remove upper torque strut.
(13) Remove ground strap and power steering hose
support clip from engine mount bracket.
(14) Remove power steering pump assembly and
set aside.
(15) Support engine from beneath with a suitable
jack.
(16) Remove right side engine mount to bracket
through bolt.
(17) Remove the lower engine mount bracket bolt.
Raise engine slightly and remove the upper engine
mount bracket bolts.(18) Remove engine mount bracket. This procedure
may require additional raising/lowering of engine
until bracket will clear engine components.
(19) Remove front timing belt cover.
(20) Rotate engine until timing marks are aligned.
(21) Remove timing belt and tensioner. Refer to
procedures in this section.
(22) Remove camshaft sprocket. Refer to proce-
dures in this section.
(23) Remove rear timing belt cover.
(24) Disconnect fuel line at fuel rail.
(25) Remove coolant recovery container.
(26) Remove ground wire to cylinder head.
(27) Remove upper radiator hose.
(28) Remove intake manifold. Refer to procedure
in this section.
(29) Disconnect ignition coil electrical connector.
Remove coil pack and spark plug cables from engine.
(30) Remove Crankcase Closed Ventilation (CCV)
hose from cylinder head cover.
(31) Disconnect cam sensor and coolant tempera-
ture electrical connectors.
(32) Remove heater tube to cylinder head attach-
ing fasteners.
(33) Remove heater hose from thermostat housing
connector.
(34) Remove cylinder head cover.
(35) Remove cylinder head bolts.
(36) Remove cylinder head and gasket (Fig. 55).
PL2.0L SOHC ENGINE 9 - 37
REMOVAL AND INSTALLATION (Continued)

(2) Apply MopartGasket Sealant (aerosol can) to
both sides of the new cylinder head gasket.
(3) Position a new cylinder head gasket on the
locating dowels.
(4) Position crankshaft sprocket to TDC, then
rotate crankshaft until mark is three teeth before
TDC (Fig. 59). This will ensure that no piston-to-
valve contact occurs upon installation of cylinder
head in the event of camshaft rotation.
(5) Position the cylinder head onto the cylinder
block. Make sure the cylinder head seats fully over
the locating dowels.
(6) Before installing cylinder head bolts, the
threads should be oiled with engine oil. The 4 shorter
bolts 164 mm (6.45 in.), are to be installed in posi-
tions 7, 8, 9, and 10 (Fig. 60).
(7) Tighten the cylinder head bolts in the sequence
shown in (Fig. 60). Using the 4 step torque method,
tighten according to the following values:²First All to 34 N´m (25 ft. lbs.)
²Second All to 68 N´m (50 ft. lbs.)
²Third All to 68 N´m (50 ft. lbs.)
²Fourth Turn an additional 1/4 Turn.Do not use
a torque wrench for this step.
(8) Install cylinder head cover.
(9) Install heater hose to thermostat housing con-
nector.
(10) Install heater tube to cylinder head attaching
fasteners.
(11) Connect cam sensor and coolant temperature
electrical connectors.
(12) Connect Crankcase Closed Ventilation (CCV)
hose to cylinder head cover.
Fig. 56 Checking Cylinder Head Flatness
1 ± FEELER GAUGE
2 ± STRAIGHT EDGE
Fig. 57 Checking Bolts for Stretching (Necking)
1 ± STRETCHED BOLT
2 ± THREADS ARE NOT STRAIGHT ON LINE
3 ± THREADS ARE STRAIGHT ON LINE
4 ± UNSTRETCHED BOLT
Fig. 58 Proper Tool Usage for Surface Preparation
1 ± ABRASIVE PAD
2 ± 3M ROLOCYBRISTLE DISC
3 ± PLASTIC/WOOD SCRAPER
Fig. 59 Crankshaft Sprocket Position
1 ± TDC MARK
PL2.0L SOHC ENGINE 9 - 39
REMOVAL AND INSTALLATION (Continued)

²All inputs monitored for proper voltage range.
²All monitored components (refer to the Emission
section for On-Board Diagnostics).
The PCM compares the upstream and downstream
heated oxygen sensor inputs to measure catalytic
convertor efficiency. If the catalyst efficiency drops
below the minimum acceptable percentage, the PCM
stores a diagnostic trouble code in memory.
During certain idle conditions, the PCM may enter
a variable idle speed strategy. During variable idle
speed strategy the PCM adjusts engine speed based
on the following inputs.
²A/C sense
²Battery voltage
²Battery temperature
²Engine coolant temperature
²Engine run time
²Power steering pressure switch
²Vehicle mileage
ACCELERATION MODE
This is a CLOSED LOOP mode. The PCM recog-
nizes an abrupt increase in Throttle Position sensor
output voltage or MAP sensor output voltage as a
demand for increased engine output and vehicle
acceleration. The PCM increases injector pulse width
in response to increased fuel demand.
DECELERATION MODE
This is a CLOSED LOOP mode. During decelera-
tion the following inputs are received by the PCM:
²A/C pressure transducer
²A/C sense
²Battery voltage
²Intake air temperature
²Engine coolant temperature
²Crankshaft position (engine speed)
²Exhaust gas oxygen content (upstream heated
oxygen sensor)
²Knock sensor
²Manifold absolute pressure
²Power steering pressure switch
²Throttle position
²IAC motor control changes in response to MAP
sensor feedback.
The PCM may receive a closed throttle input from
the Throttle Position Sensor (TPS) when it senses an
abrupt decrease in manifold pressure. This indicates
a hard deceleration. In response, the PCM may
momentarily turn off the injectors. This helps
improve fuel economy, emissions and engine braking.
If decel fuel shutoff is detected, downstream oxy-
gen sensor diagnostics is performed.WIDE-OPEN-THROTTLE MODE
This is an OPEN LOOP mode. During wide-open-
throttle operation, the following inputs are received
by the PCM:
²Intake air temperature
²Engine coolant temperature
²Engine speed
²Knock sensor
²Manifold absolute pressure
²Throttle position
When the PCM senses a wide-open-throttle condi-
tion through the Throttle Position Sensor (TPS) it de-
energizes the A/C compressor clutch relay. This
disables the air conditioning system.
The PCM does not monitor the heated oxygen sen-
sor inputs during wide-open-throttle operation except
for downstream heated oxygen sensor and both
shorted diagnostics. The PCM adjusts injector pulse
width to supply a predetermined amount of addi-
tional fuel.
IGNITION SWITCH OFF MODE
When the operator turns the ignition switch to the
OFF position, the following occurs:
²All outputs are turned off, unless 02 Heater
Monitor test is being run. Refer to the Emission sec-
tion for On-Board Diagnostics.
²No inputs are monitored except for the heated
oxygen sensors. The PCM monitors the heating ele-
ments in the oxygen sensors and then shuts down.
SYSTEM DIAGNOSIS
OPERATION
The PCM can test many of its own input and out-
put circuits. If the PCM senses a fault in a major
system, the PCM stores a Diagnostic Trouble Code
(DTC) in memory.
For DTC information see On-Board Diagnostics.
POWER DISTRIBUTION CENTER
The Power Distribution Center (PDC) is located
next to the battery (Fig. 1). The PDC contains the
starter relay, radiator fan relay, A/C compressor
clutch relay, auto shutdown relay, fuel pump relay
and several fuses.
POWERTRAIN CONTROL MODULE
The Powertrain Control Module (PCM) is a digital
computer containing a microprocessor (Fig. 2). The
PCM receives input signals from various switches
and sensors that are referred to as PCM Inputs.
Based on these inputs, the PCM adjusts various
engine and vehicle operations through devices that
are referred to as PCM Outputs.
PCM Inputs:
14 - 24 FUEL SYSTEMPL
DESCRIPTION AND OPERATION (Continued)

Like all Hall-effect sensors, the electronics of the
sensor needs a power source. This power source is
provided by the PCM. It is the same 8 volt power
supply that is used by the CKP and CMP sensors.
The vehicle speed sensor generates 8 pulses per
sensor revolution. This signal, in conjunction with a
closed throttle signal from the throttle position sen-
sor, indicates a closed throttle deceleration to the
PCM. Under deceleration conditions, the PCM
adjusts the Idle Air Control (IAC) motor to maintain
a desired MAP value.
When the vehicle is stopped at idle, a closed throt-
tle signal is received by the PCM (but a speed sensor
signal is not received). Under idle conditions, the
PCM adjusts the IAC motor to maintain a desired
engine speed.
AIR CONDITIONING CLUTCH RELAYÐPCM
OUTPUT
DESCRIPTION
The air conditioning clutch relay is located in the
PDC. The inside top of the PDC cover has a label
showing relay and fuse location.
OPERATION
The PCM controls the air conditioning clutch relay
ground circuit. The A/C clutch relay coil side contains
a 10 amp fuse between the buss bar in the Power
Distribution Center (PDC) and the relay. The power
side of this relay is fused with a 40 amp fuse. When
the PCM receives an air conditioning input, it
grounds the A/C compressor clutch relay and the
radiator fan relay.
When the PCM senses low idle speeds or wide open
throttle through the throttle position sensor, it
removes the ground for the A/C compressor clutch
relay. When the relay de-energizes, the contacts open
preventing air conditioning clutch engagement. Also,
if the PCM senses a part throttle launch condition, it
disables the A/C compressor clutch for several sec-
onds.
AUTOMATIC SHUTDOWN RELAYÐPCM
OUTPUT
DESCRIPTION
The ASD relay is located in the PDC. The inside
top of the PDC cover has a label showing relay and
fuse location.
OPERATION
The automatic shutdown (ASD) relay supplies bat-
tery voltage to the fuel injectors, electronic ignition
coil and the heating elements in the oxygen sensors
generator field and PCM sense circuit.A buss bar in the power distribution center (PDC)
supplies voltage to the solenoid side and contact side
of the relay. The ASD relay power circuit contains a
fuse between the buss bar in the PDC and the relay.
The fuse also protects the power circuit for the fuel
pump relay and pump. The fuse is located in the
PDC. Refer to the Wiring Diagrams for circuit infor-
mation.
The PCM controls the relay by switching the
ground path for the solenoid side of the relay on and
off. The PCM turns the ground path off when the
ignition switch is in the Off position unless the 02
Heater Monitor test is being run. When the ignition
switch is in the On or Crank position, the PCM mon-
itors the crankshaft position sensor and camshaft
position sensor signals to determine engine speed
and ignition timing (coil dwell). If the PCM does not
receive the crankshaft position sensor and camshaft
position sensor signals when the ignition switch is in
the Run position, it will de-energize the ASD relay.
CHARGING SYSTEM INDICATOR LAMPÐPCM
OUTPUT
OPERATION
The PCM turns the instrument panel Charging
System Lamp on. Refer to the Charging system sec-
tion information.
FUEL PUMP RELAYÐPCM OUTPUT
DESCRIPTION
The fuel pump relay is located in the PDC. The
inside top of the PDC cover has a label showing relay
and fuse location.
OPERATION
The fuel pump relay supplies battery voltage to the
fuel pump. A buss bar in the Power Distribution Cen-
ter (PDC) supplies voltage to the solenoid side and
contact side of the relay. The fuel pump relay power
circuit contains a fuse between the buss bar in the
PDC and the relay. The fuse also protects the power
circuit for the Automatic Shutdown (ASD) relay. The
fuse is located in the PDC. Refer to the Wiring Dia-
grams for circuit information.
The PCM controls the fuel pump relay by switch-
ing the ground path for the solenoid side of the relay
on and off. The PCM turns the ground path off when
the ignition switch is in the Off position. When the
ignition switch is in the On position, the PCM ener-
gizes the fuel pump. If the crankshaft position sensor
does not detect engine rotation, the PCM de-ener-
gizes the relay after approximately one second.
14 - 38 FUEL SYSTEMPL
DESCRIPTION AND OPERATION (Continued)

EMISSION CONTROL SYSTEMS
TABLE OF CONTENTS
page page
ON-BOARD DIAGNOSTICS................... 1 EVAPORATIVE EMISSION CONTROLS......... 25
ON-BOARD DIAGNOSTICS
TABLE OF CONTENTS
page page
DESCRIPTION AND OPERATION
SYSTEM DESCRIPTION....................1
TASK MANAGER..........................2
MALFUNCTION INDICATOR LAMP (MIL)........5
DRB III STATE DISPLAY TEST MODE..........5
DRB III CIRCUIT ACTUATION TEST MODE......5
DIAGNOSTIC TROUBLE CODES..............5
DIAGNOSTIC TROUBLE CODE
DESCRIPTIONS.........................6MONITORED SYSTEMS....................15
TRIP DEFINITION........................19
MONITORED COMPONENT.................19
NON-MONITORED CIRCUITS...............23
HIGH AND LOW LIMITS....................24
LOAD VALUE............................24
DESCRIPTION AND OPERATION
SYSTEM DESCRIPTION
DESCRIPTION
OBD II requires that vehicles falling under OBD II
guidelines utilize the following system monitors:
²Comprehensive Component Monitor (inputs/out-
puts for powertrain management that affect emis-
sions, but do not have a specific major monitor)
²Fuel Control Monitor (fuel compensation
required to maintain stoichiometric ratio rich/lean)
²Misfire Monitor (change in crankshaft speed)
²Oxygen Sensor Heater Monitor (response and
performance of oxygen sensors)
²Catalyst Monitor (Performance and efficiency of
catalyst)
²Evaporative Emissions Monitor (performance of
and leaks from EVAP system)
²Exhaust Gas Recirculation Monitor (flow perfor-
mance of EGR system)
The software was rewritten to enable the PCM to
carry out the responsibilities to meet these required
guidelines. The PCM now contains a Task Manager.
OPERATION
The Powertrain Control Module (PCM) monitors
many different circuits in the fuel injection, ignition,
emission and engine systems. If the PCM senses a
problem with a monitored circuit often enough to
indicate an actual problem, it stores a Diagnostic
Trouble Code (DTC) in the PCM's memory. If the
code applies to a non-emissions related component or
system, and the problem is repaired or ceases to
exist, the PCM cancels the code after 40 warmup
cycles. Diagnostic trouble codes that affect vehicle
emissions illuminate the Malfunction Indicator Lamp
(MIL). Refer to Malfunction Indicator Lamp in this
section.
Certain criteria must be met before the PCM
stores a DTC in memory. The criteria may be a spe-
cific range of engine RPM, engine temperature,
and/or input voltage to the PCM.
The PCM might not store a DTC for a monitored
circuit even though a malfunction has occurred. This
may happen because one of the DTC criteria for the
circuit has not been met.For example, assume the
diagnostic trouble code criteria requires the PCM to
monitor the circuit only when the engine operates
between 750 and 2000 RPM. Suppose the sensor's
output circuit shorts to ground when engine operates
above 2400 RPM (resulting in 0 volt input to the
PLEMISSION CONTROL SYSTEMS 25 - 1

OPERATION
BULB CHECK
Each time the ignition key is turned to the ON
position, the malfunction indicator (check engine)
lamp on the instrument panel should illuminate for
approximately 2 seconds then go out. This is done for
a bulb check.
OBTAINING DTC'S USING DRB SCAN TOOL
(1) Connect the DRB scan tool to the data link
(diagnostic) connector. This connector is located inthe passenger compartment; at the lower edge of
instrument panel; near the steering column.
(2) Turn the ignition switch on and access the
ªRead Faultº screen.
(3) Record all the DTC's and ªfreeze frameº infor-
mation shown on the DRB scan tool.
(4) To erase DTC's, use the ªErase Trouble Codeº
data screen on the DRB scan tool.Do not erase any
DTC's until problems have been investigated
and repairs have been performed.
DIAGNOSTIC TROUBLE CODE DESCRIPTIONS
(M) Check Engine Lamp (MIL) will illuminate during engine operation if this Diagnostic Trouble Code was recorded.
(G) Generator Lamp Illuminated
GENERIC SCAN
TOOL CODEDRB SCAN TOOL DISPLAY DESCRIPTION OF DIAGNOSTIC TROUBLE CODE
P0106 (M) Barometric Pressure Out of Range MAP sensor input voltage out of an acceptable range
detected during reading of barometric pressure at
key-on.
P0107 (M) Map Sensor Voltage Too Low MAP sensor input below minimum acceptable voltage.
P0108 (M) Map Sensor Voltage Too High MAP sensor input above maximum acceptable voltage.
P0112 (M) Intake Air Temp Sensor Voltage Low Intake air (charge) temperature sensor input below the
minimum acceptable voltage.
P0113 (M) Intake Air Temp Sensor Voltage
HighIntake air (charge) temperature sensor input above the
maximum acceptable voltage.
P0116 A rationatilty error has been detected in the coolant
temp sensor.
P0117 (M) ECT Sensor Voltage Too Low Engine coolant temperature sensor input below the
minimum acceptable voltage.
P0118 (M) ECT Sensor Voltage Too High Engine coolant temperature sensor input above the
maximum acceptable voltage.
P0121 (M) TPS Voltage Does Not Agree With
MAPTPS signal does not correlate to MAP sensor signal.
P0122 (M) Throttle Position Sensor Voltage
LowThrottle position sensor input below the acceptable
voltage range.
P0123 (M) Throttle Position Sensor Voltage
HighThrottle position sensor input above the maximum
acceptable voltage.
P0125 (M) Closed Loop Temp Not Reached Time to enter Closed Loop Operation (Fuel Control) is
excessive.
P0130 1/1 O2 Sensor Heater Relay Circuit An open or shorted condition detected in the ASD or
CNG shutoff relay control ckt.
P0131 (M) 1/1 O2 Sensor Shorted To Ground Oxygen sensor input voltage maintained below normal
operating range.
P0132 (M) 1/1 O2 Sensor Shorted To Voltage Oxygen sensor input voltage maintained above normal
operating range.
P0133 (M) 1/1 O2 Sensor Slow Response Oxygen sensor response slower than minimum required
switching frequency.
25 - 6 EMISSION CONTROL SYSTEMSPL
DESCRIPTION AND OPERATION (Continued)

(M) Check Engine Lamp (MIL) will illuminate during engine operation if this Diagnostic Trouble Code was recorded.
P0134 (M) 1/1 O2 Sensor Stays at Center Neither rich or lean condition is detected from the
oxygen sensor input.
P0135 (M) 1/1 O2 Sensor Heater Failure Oxygen sensor heater element malfunction.
P0136 1/2 O2 Sensor Heater Relay Circuit An open or shorted condition detected in the ASD or
CNG shutoff relay control ckt.
P0137 (M) 1/2 O2 Sensor Shorted To Ground Oxygen sensor input voltage maintained below normal
operating range.
P0138 (M) 1/2 O2 Sensor Shorted To Voltage Oxygen sensor input voltage maintained above normal
operating range.
P0139 (M) 1/2 O2 Sensor Slow Response Oxygen sensor response not as expected.
P0140 (M) 1/2 O2 Sensor Stays at Center Neither rich or lean condition is detected from the
oxygen sensor.
P0141 (M) 1/2 O2 Sensor Heater Failure Oxygen sensor heater element malfunction.
P0143 1/3 O2 Sensor Shorted To Ground Oxygen sensor input voltage maintained below normal
operating range.
P0144 1/3 O2 Sensor Shorted To Voltage Oxygen sensor input voltage maintained above normal
operating range.
P0145 1/3 O2 Sensor Slow Response Oxygen sensor response slower than minimum required
switching frequency.
P0146 1/3 O2 Sensor Stays at Center Neither rich or lean condition is detected from the
oxygen sensor.
P0147 1/3 O2 Sensor Heater Failure Oxygen sensor heater element malfunction.
P0151 (M) 2/1 O2 Sensor Shorted To Ground Oxygen sensor input voltage maintained below normal
operating range.
P0152 (M) 2/1 O2 Sensor Shorted To Voltage Oxygen sensor input voltage sustained above normal
operating range.
P0153 (M) 2/1 O2 Sensor Slow Response Oxygen sensor response slower than minimum required
switching frequency.
P0154 (M) 2/1 O2 Sensor Stays at Center Neither rich or lean condition is detected from the
oxygen sensor.
P0155 (M) 2/1 O2 Sensor Heater Failure Oxygen sensor heater element malfunction.
P0157 (M) 2/2 O2 Sensor Shorted To Ground Oxygen sensor input voltage maintained below normal
operating range.
P0158 (M) 2/2 O2 Sensor Shorted To Voltage Oxygen sensor input voltage maintained above normal
operating range.
P0159 2/2 O2 Sensor Slow Response Oxygen sensor response slower than minimum required
switching frequency.
P0160 (M) 2/2 O2 Sensor Stays at Center Neither rich or lean condition is detected from the
oxygen sensor.
P0161 (M) 2/2 O2 Sensor Heater Failure Oxygen sensor heater element malfunction.
P0165 Starter Relay Control Circuit An open or shorted condition detected in the starter
relay control circuit.
P0171 (M) 1/1 Fuel System Lean A lean air/fuel mixture has been indicated by an
abnormally rich correction factor.
P0172 (M) 1/1 Fuel System Rich A rich air/fuel mixture has been indicated by an
abnormally lean correction factor.
PLEMISSION CONTROL SYSTEMS 25 - 7
DESCRIPTION AND OPERATION (Continued)