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Chrysler New Yorker. Manual - part 337

EMISSION CONTROL SYSTEMS

CONTENTS

page

EVAPORATIVE EMISSION CONTROLS . . . . . . . . 13
EXHAUST GAS RECIRCULATION

(EGR) SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . 18

ON-BOARD DIAGNOSTICS . . . . . . . . . . . . . . . . . . 1

ON-BOARD DIAGNOSTICS

INDEX

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

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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

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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

P0340

No Cam Signal at PCM

No camshaft signal detected during engine

cranking.

P0601

Internal Controller Failure

PCM Internal fault condition detected.

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.

P1594

Charging System Voltage Too

High

Battery voltage sense input above target charging

voltage during engine operation.

P1388

Auto Shutdown Relay Control

Circuit

An open or shorted condition detected in the auto

shutdown relay circuit.

P0622

Generator Field Not

Switching Properly

An open or shorted condition detected in the

generator field control circuit.

P1595

Speed Control Solenoid

Circuits

An open or shorted condition detected in the

Speed Control vacuum or vent solenoid circuits.

P0645

A/C Clutch Relay Circuit

An open or shorted condition detected in the A/C

clutch relay circuit.

P0403

EGR Solenoid Circuit

An open or shorted condition detected in the

EGR transducer solenoid circuit.

P0443

EVAP Purge Solenoid Circuit

An open or shorted condition detected in the duty

cycle purge solenoid circuit.

P0203

Injector #3 Control Circuit

Injector #3 output driver does not respond

properly to the control signal.

P0202

Injector #2 Control Circuit

Injector #2 output driver does not respond

properly to the control signal.

P0201

Injector #1 Control Circuit

Injector #1 output driver does not respond

properly to the control signal.

P0505

Idle Air Control Motor Circuits

A shorted or open condition detected in one or

more of the idle air control motor circuits.

P0122

Throttle Position Sensor

Voltage Low

Throttle position sensor input below the minimum

acceptable voltage.

P0123

Throttle Position Sensor

Voltage High

Throttle position sensor input above the maximum

acceptable voltage.

P0117

ECT Sensor Voltage Too Low

Engine coolant temperature sensor input below

minimum acceptable voltage.

P0118

ECT Sensor Voltage Too

High

Engine coolant temperature sensor input above

maximum acceptable voltage.

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

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DESCRIPTION AND OPERATION (Continued)

Hex Code

Generic

Scan Tool

Code

DRB Scan Tool Display

Description of Diagnostic Trouble Code

P1281

Engine Is Cold Too Long

Engine did not reach operating temperature within

acceptable limits.

P0500

No Vehicle Speed Sensor

Signal

No vehicle speed sensor signal detected during

road load conditions.

P0107

MAP Sensor Voltage Too Low

MAP sensor input below minimum acceptable

voltage.

P0108

MAP Sensor Voltage Too

High

MAP sensor input above maximum acceptable

voltage.

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.

P0320

No Crank Reference Signal

at PCM

No crank reference signal detected during engine

cranking.

P0353

Ignition Coil #3 Primary

Circuit

Peak primary circuit current not achieved with

maximum dwell time.

P0352

Ignition Coil #2 Primary

Circuit

Peak primary circuit current not achieved with

maximum dwell time.

P0351

Ignition Coil #1 Primary

Circuit

Peak primary circuit current not achieved with

maximum dwell time.

P1389

No ASD Relay Output

Voltage at PCM

An Open condition Detected In The ASD Relay

Output Circuit.

P0401

EGR System Failure

Required change in air/fuel ratio not detected

during diagnostic test.

P1697

PCM Failure SRI Miles Not

Stored

Unsuccessful attempt to update EMR mileage in

the PCM EEPROM.

P1696

PCM Failure EEPROM Write

Denied

Unsuccessful attempt to write to an EEPROM

location by the PCM.

P0112

Intake Air Temp Sensor

Voltage Low

Intake air temperature sensor input below the

maximum acceptable voltage.

P0113

Intake Air Temp Sensor

Voltage High

Intake air temperature sensor input above the

minimum acceptable voltage.

P0325

Knock Sensor #1 Circuit

Sensor is either shorted to ground or 12 volts.

Will not detect open circuit.

P0106

Baro Out of Range

Barometric pressure out of out of range.

P0204

Injector #4 Control Circuit

Injector #4 output driver does not respond

properly to the control signal.

P0132

Right Rear (or just) Upstream

O2S Shorted to Voltage

Oxygen sensor input voltage maintained above

the normal operating range.

P0154

Left Front O2S Stays at

Center

Neither rich or lean condition detected from the

oxygen sensor.

P0152

Left Front O2S Shorted To

Voltage

Oxygen sensor input voltage maintained above

the normal operating range.

P0600

PCM Failure SPI

Communications

PCM Internal fault condition detected.

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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