Chrysler New Yorker. Manual — part 337
EMISSION CONTROL SYSTEMS
CONTENTS
page
page
EVAPORATIVE EMISSION CONTROLS . . . . . . . . 13
EXHAUST GAS RECIRCULATION
(EGR) SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . 18
ON-BOARD DIAGNOSTICS . . . . . . . . . . . . . . . . . . 1
ON-BOARD DIAGNOSTICS
INDEX
page
page
GENERAL INFORMATION
SYSTEM DESCRIPTION . . . . . . . . . . . . . . . . . . . 1
DESCRIPTION AND OPERATION
CIRCUIT ACTUATION TEST MODE . . . . . . . . . . . 2
COMPONENT MONITORS . . . . . . . . . . . . . . . . . 11
DIAGNOSTIC TROUBLE CODES . . . . . . . . . . . . . 2
HIGH AND LOW LIMITS . . . . . . . . . . . . . . . . . . . 12
LOAD VALUE . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
MALFUNCTION INDICATOR LAMP (MIL) . . . . . . . 2
MONITORED SYSTEMS . . . . . . . . . . . . . . . . . . . . 8
NON-MONITORED CIRCUITS . . . . . . . . . . . . . . . 11
STATE DISPLAY TEST MODE . . . . . . . . . . . . . . . 2
TRIP DEFINITION . . . . . . . . . . . . . . . . . . . . . . . . 10
GENERAL INFORMATION
SYSTEM DESCRIPTION
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
PCM). Because the condition happens at an engine
speed above the maximum threshold (2000 rpm), the
PCM will not store a DTC.
There are several operating conditions for which
the PCM monitors and sets DTC’s. Refer to Moni-
tored Systems, Components, and Non-Monitored Cir-
cuits in this section.
NOTE: Various diagnostic procedures may actually
cause a diagnostic monitor to set a DTC. For
instance, pulling a spark plug wire to perform a
spark test may set the misfire code. When a repair
is completed and verified, use the DRB scan tool to
erase all DTC’s and extinguish the MIL.
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EMISSION CONTROL SYSTEMS
25 - 1
Technicians can display stored DTC’s. Refer to
Diagnostic Trouble Codes in this section. For DTC
information, refer to charts in this section.
DESCRIPTION AND OPERATION
MALFUNCTION INDICATOR LAMP (MIL)
As a functional test, the Malfunction Indicator
Lamp (MIL) illuminates at key-on before engine
cranking. Whenever the Powertrain Control Module
(PCM) sets a Diagnostic Trouble Code (DTC) that
affects vehicle emissions, it illuminates the MIL. If a
problem is detected, the PCM sends a message over
the PCI Bus to the instrument cluster to illuminate
the lamp. The PCM illuminates the MIL only for
DTC’s that affect vehicle emissions. The MIL stays
on continuously when the PCM has entered a
Limp-In mode or identified a failed emission compo-
nent or system. The MIL remains on until the DTC
is erased. Refer to the Diagnostic Trouble Code
charts in this group for emission related codes.
Also, the MIL either flashes or illuminates contin-
uously when the PCM detects active engine misfire.
Refer to Misfire Monitoring in this section.
Additionally, the PCM may reset (turn off) the MIL
when one of the following occur:
• PCM does not detect the malfunction for 3 consec-
utive trips (except misfire and fuel system monitors).
• PCM does not detect a malfunction while per-
forming three successive engine misfire or fuel sys-
tem tests. The PCM performs these tests while the
engine is operating within
6 375 RPM of and within
10% of the load of the operating condition at which
the malfunction was first detected.
STATE DISPLAY TEST MODE
The switch inputs to the Powertrain Control Mod-
ule (PCM) have two recognized states; HIGH and
LOW. For this reason, the PCM cannot recognize the
difference between a selected switch position versus
an open circuit, a short circuit, or a defective switch.
If the State Display screen shows the change from
HIGH to LOW or LOW to HIGH, assume the entire
switch circuit to the PCM functions properly. From
the state display screen, access either State Display
Inputs and Outputs or State Display Sensors.
CIRCUIT ACTUATION TEST MODE
The Circuit Actuation Test Mode checks for proper
operation of output circuits or devices the Powertrain
Control Module (PCM) may not internally recognize.
The PCM attempts to activate these outputs and allow
an observer to verify proper operation. Most of the tests
provide an audible or visual indication of device opera-
tion (click of relay contacts, fuel spray, etc.). Except for
intermittent conditions, if a device functions properly
during testing, assume the device, its associated wiring,
and driver circuit work correctly.
DIAGNOSTIC TROUBLE CODES
A Diagnostic Trouble Code (DTC) indicates the
PCM has recognized an abnormal condition in the
system.
The preferred and most accurate method of retriev-
ing a DTC is by using the DRB scan tool. The scan
tool supplies detailed diagnostic information which
can be used to more accurately diagnose causes for a
DTC.
Remember that DTC’s are the results of a sys-
tem or circuit failure, but do not directly iden-
tify the failed component or components.
NOTE: For a list of DTC’s, refer to the charts in this
section.
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 in
the passenger compartment; at the lower edge of
instrument panel; near the steering column.
(2) Turn the ignition switch on and access the
“Read Fault” screen.
Fig. 1 Data Link (Diagnostic) Connector
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EMISSION CONTROL SYSTEMS
300M
GENERAL INFORMATION (Continued)
(3) Record all the DTC’s and “freeze frame” infor-
mation shown on the DRB scan tool.
(4) To erase DTC’s, use the “Erase Trouble Code”
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
Hex Code
Generic
Scan Tool
Code
DRB Scan Tool Display
Description of Diagnostic Trouble Code
01
P0340
No Cam Signal at PCM
No camshaft signal detected during engine
cranking.
02
P0601
Internal Controller Failure
PCM Internal fault condition detected.
05
P1682
Charging System Voltage Too
Low
Battery voltage sense input below target charging
during engine operation. Also, no significant
change detected in battery voltage during active
test of generator output circuit.
06
P1594
Charging System Voltage Too
High
Battery voltage sense input above target charging
voltage during engine operation.
0A
P1388
Auto Shutdown Relay Control
Circuit
An open or shorted condition detected in the auto
shutdown relay circuit.
0B
P0622
Generator Field Not
Switching Properly
An open or shorted condition detected in the
generator field control circuit.
0F
P1595
Speed Control Solenoid
Circuits
An open or shorted condition detected in the
Speed Control vacuum or vent solenoid circuits.
10
P0645
A/C Clutch Relay Circuit
An open or shorted condition detected in the A/C
clutch relay circuit.
11
P0403
EGR Solenoid Circuit
An open or shorted condition detected in the
EGR transducer solenoid circuit.
12
P0443
EVAP Purge Solenoid Circuit
An open or shorted condition detected in the duty
cycle purge solenoid circuit.
13
P0203
Injector #3 Control Circuit
Injector #3 output driver does not respond
properly to the control signal.
14
P0202
Injector #2 Control Circuit
Injector #2 output driver does not respond
properly to the control signal.
15
P0201
Injector #1 Control Circuit
Injector #1 output driver does not respond
properly to the control signal.
19
P0505
Idle Air Control Motor Circuits
A shorted or open condition detected in one or
more of the idle air control motor circuits.
1A
P0122
Throttle Position Sensor
Voltage Low
Throttle position sensor input below the minimum
acceptable voltage.
1B
P0123
Throttle Position Sensor
Voltage High
Throttle position sensor input above the maximum
acceptable voltage.
1E
P0117
ECT Sensor Voltage Too Low
Engine coolant temperature sensor input below
minimum acceptable voltage.
1F
P0118
ECT Sensor Voltage Too
High
Engine coolant temperature sensor input above
maximum acceptable voltage.
20
P0134
Right Rear (or just) Upstream
O2S Stays at Center
Neither rich or lean condition detected from the
oxygen sensor.
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EMISSION CONTROL SYSTEMS
25 - 3
DESCRIPTION AND OPERATION (Continued)
Hex Code
Generic
Scan Tool
Code
DRB Scan Tool Display
Description of Diagnostic Trouble Code
21
P1281
Engine Is Cold Too Long
Engine did not reach operating temperature within
acceptable limits.
23
P0500
No Vehicle Speed Sensor
Signal
No vehicle speed sensor signal detected during
road load conditions.
24
P0107
MAP Sensor Voltage Too Low
MAP sensor input below minimum acceptable
voltage.
25
P0108
MAP Sensor Voltage Too
High
MAP sensor input above maximum acceptable
voltage.
27
P1297
No Change in MAP From
Start to Run
No difference recognized between the engine
MAP reading and the barometric (atmospheric)
pressure reading from start-up.
28
P0320
No Crank Reference Signal
at PCM
No crank reference signal detected during engine
cranking.
29
P0353
Ignition Coil #3 Primary
Circuit
Peak primary circuit current not achieved with
maximum dwell time.
2A
P0352
Ignition Coil #2 Primary
Circuit
Peak primary circuit current not achieved with
maximum dwell time.
2B
P0351
Ignition Coil #1 Primary
Circuit
Peak primary circuit current not achieved with
maximum dwell time.
2C
P1389
No ASD Relay Output
Voltage at PCM
An Open condition Detected In The ASD Relay
Output Circuit.
2E
P0401
EGR System Failure
Required change in air/fuel ratio not detected
during diagnostic test.
30
P1697
PCM Failure SRI Miles Not
Stored
Unsuccessful attempt to update EMR mileage in
the PCM EEPROM.
31
P1696
PCM Failure EEPROM Write
Denied
Unsuccessful attempt to write to an EEPROM
location by the PCM.
39
P0112
Intake Air Temp Sensor
Voltage Low
Intake air temperature sensor input below the
maximum acceptable voltage.
3A
P0113
Intake Air Temp Sensor
Voltage High
Intake air temperature sensor input above the
minimum acceptable voltage.
3B
P0325
Knock Sensor #1 Circuit
Sensor is either shorted to ground or 12 volts.
Will not detect open circuit.
3C
P0106
Baro Out of Range
Barometric pressure out of out of range.
3D
P0204
Injector #4 Control Circuit
Injector #4 output driver does not respond
properly to the control signal.
3E
P0132
Right Rear (or just) Upstream
O2S Shorted to Voltage
Oxygen sensor input voltage maintained above
the normal operating range.
41
P0154
Left Front O2S Stays at
Center
Neither rich or lean condition detected from the
oxygen sensor.
42
P0152
Left Front O2S Shorted To
Voltage
Oxygen sensor input voltage maintained above
the normal operating range.
44
P0600
PCM Failure SPI
Communications
PCM Internal fault condition detected.
45
P0205
Injector #5 Control Circuit
Injector #5 output driver does not respond
properly to the control signal.
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EMISSION CONTROL SYSTEMS
300M
DESCRIPTION AND OPERATION (Continued)
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