exj 25a, JEEP Manuals, Electronic Service Manual (jeep cherokee xj do 2000)
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EMISSION CONTROL SYSTEM
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EMISSION CONTROL SYSTEM
TABLE OF CONTENTS
page
page
ON-BOARD DIAGNOSTICS—2.5L DIESEL
1
EXHAUST EMISSION CONTROLS—2.5L
6
ON-BOARD DIAGNOSTICS—2.5L DIESEL ENGINE
TABLE OF CONTENTS
page
page
DESCRIPTION AND OPERATION
EMISSION CONTROL SYSTEM—2.5L DIESEL
DESCRIPTION AND OPERATION
There are several operating conditions that the
ECM does not monitor and set a DTC for. Refer to
the following Monitored Circuits and Non–Monitored
Circuits in this section.
EMISSION CONTROL SYSTEM—2.5L DIESEL
ENGINE
ECM MONITORED SYSTEMS
The ECM can detect certain problems in the elec-
trical system.
Open or Shorted Circuit
– The ECM will not
distinguish between an open or a short to ground,
however the ECM can determine if the circuit is
shorted to voltage.
Output Device Current Flow
– The ECM senses
whether the output devices are electrically connected.
If there is a problem with the circuit, the ECM
senses whether the circuit is open, shorted to ground
(–), or shorted to (+) voltage.
DESCRIPTION
The 2.5L diesel Engine Control Module (ECM) and
Powertrain Control Module (PCM) monitor and con-
trol many different circuits in the fuel injection pump
and engine systems. If the ECM senses a problem
with a monitored circuit that indicates an actual
problem, a Diagnostic Trouble Code (DTC) will be
stored in the PCM’s memory, and eventually may
illuminate the Check Engine Lamp constantly while
the key is on. If the problem is repaired, or is inter-
mittent, the ECM will erase the DTC after 40
warm-up cycles without the the fault detected. A
warm-up cycle consists of starting the vehicle when
the engine is cold, then the engine is warmed up to a
certain temperature, and finally, the engine tempera-
ture falls to a normal operating temperature, then
the key is turned off.
Certain criteria must be met for a DTC to be
entered into ECM memory. The criteria may be a
specific range of engine rpm, engine or fuel tempera-
ture and/or input voltage to the ECM. A DTC indi-
cates that the ECM has identified an abnormal
signal in a circuit or the system. A DTC may indicate
the result of a failure, but never identify the failed
component directly.
ECM NON–MONITORED SYSTEMS
The ECM does not monitor the following circuits,
systems or conditions that could have malfunctions
that result in driveability problems. A DTC will not
be displayed for these conditions.
Fuel Pressure:
Fuel pressure is controlled by the
fuel injection pump. The ECM cannot detect fuel
pressure problems in this component. The ECM does
a comparison analysis of fuel quantity, fuel timing,
fuel temperature, and control sleeve sensor inputs to
determine if a fuel problem exists.
Cylinder Compression:
The ECM cannot detect
uneven, low, or high engine cylinder compression.
 25 - 2
EMISSION CONTROL SYSTEM
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DESCRIPTION AND OPERATION (Continued)
Exhaust
System:
The
ECM
cannot
detect
a
plugged, restricted or leaking exhaust system.
Fuel Injector Malfunctions:
The ECM cannot
determine if the fuel injector is clogged, or the wrong
injector is installed. The fuel injectors on the diesel
engine are
not controlled
by the ECM, although a
defective needle movement sensor in the #1 injector
is monitored
by the ECM.
Vacuum Assist:
Leaks or restrictions in the vac-
uum circuits of the Exhaust Gas Recirculation Sys-
tem (EGR) are not monitored by the ECM.
ECM System Ground:
The ECM cannot deter-
mine a poor system ground. However, a DTC may be
generated as a result of this condition.
ECM/PCM Connector Engagement:
The ECM
cannot determine spread or damaged connector pins.
However, a DTC may be generated as a result of this
condition.
Fig. 1 Data Link Connector Location—LHD
1 – 16–WAY DATA LINK CONNECTOR
HIGH AND LOW LIMITS
The ECM compares input signals from each input
device. It has high and low limits that are pro-
grammed into it for that device. If the inputs are not
within specifications and other DTC criteria are met,
a DTC will be stored in memory. Other DTC criteria
might include engine rpm limits or input voltages
from other sensors or switches. The other inputs
might have to be sensed by the ECM when it senses
a high or low input voltage from the control system
device in question.
DIAGNOSTIC TROUBLE CODES
DESCRIPTION
On the following pages, a list of DTC’s is provided
for the 2.5L diesel engine. A DTC indicates that the
ECM has recognized an abnormal signal in a circuit
or the system. A DTC may indicate the result of a
failure, but most likely will not identify the failed
component directly.
Fig. 2 Data Link Connector Location—RHD
1 – DATA LINK CONNECTOR
ACCESSING DIAGNOSTIC TROUBLE CODES
A stored DTC can be displayed through the use of
the DRB III
ERASING TROUBLE CODES
After the problem has been repaired, use the DRB
III
connects to the
data link connector. The data link connector is
located under the instrument panel near bottom of
the steering column (Fig. 1) (Fig. 2).
t
scan tool. The DRB III
t
t
scan tool to erase a DTC.
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EMISSION CONTROL SYSTEM
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DESCRIPTION AND OPERATION (Continued)
MSA CONTROLLER DRBIII
T
CODES
Generic Scan Tool Code
DRB III
T
Scan Tool Display
P0115
Temperature of Engine Coolant SRC High Exceeded
Temperature of Engine Coolant SRC Low Exceeded
P0180
Fuel Temperature Sensor SRC High Exceeded
Fuel Temperature Sensor SRC Low Exceeded
P0235
Turbocharger Boost Sensor Signal High Exceeded
Turbocharger Boost Sensor Signal Low Exceeded
Turbocharger Boost Sensor Supply High Exceeded
Turbocharger Boost Sensor Supply High Exceeded
Turbocharger Boost Sensor Plausibility
P0400
EGR Open Circuit
EGR Short Circuit
P0500
Veh. Speed Sensor PEC Frequency Too High
Veh. Speed Sensor SRC High Exceeded
Veh. Speed Sensor Plausibility
P0725
Engine Speed Sensor Dyn. Plausibility
Engine Speed Sensor Over Speed Recognition
Engine Speed Sensor Static Plausibilty
P1105
Atmosphere Pressure Sensor SRC High Exceeded
Atmosphere Pressure Sensor SRC Low Exceeded
P1110
Air Temp. Sensor SRC High Exceeded
Air Temp. Sensor SRC Low Exceeded
P1201
Needle Movement Sensor SRC High Exceeded
Needle Movement Sensor SRC Low Exceeded
P1220
Fuel Quantity Actuator Neg Gov Deviation Cold
Fuel Quantity Actuator Neg Gov Deviation Warm
Fuel Quantity Actuator Pos Gov Deviation Cold
Fuel Quantity Actuator Pos Gov Deviation Warm
P1225
Control Sleeve Sensor Signal High Exceeded
Control Sleeve Sensor Start End Pos. Not Attained
Control Sleeve Sensor Stop End Pos. Not Attained
P1230
Timing Governing Negative Governor Deviation
Timing Governing Positive Governor Deviation
P1515
Accel. Pedal Sensor Signal High Exceeded
Accel. Pedal Sensor Supply SRC High Exceeded
Accel. Pedal Sensor Supply SRC Low Exceeded
Accel. Pedal Sensor Plausibility
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EMISSION CONTROL SYSTEM
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DESCRIPTION AND OPERATION (Continued)
Generic Scan Tool Code
DRB III
T
Scan Tool Display
P1520
Vehicle Speed Gov Analog Ctrl Control Contact Alone
P1600
Battery Voltage SRC High Exceeded
P1605
Terminal #15 Plausibility After Startup
P1610
Regulator Lower Regulator Limit
Regulator Upper Regulator Limit
P1615
Microcontroller Gate-Array Monitoring
Microcontroller Gate-Array Watchdog
Microcontroller Prepare Fuel Quantity Stop
Microcontroller Recovery Was Occurred
Microcontrller Redundant Overrun Monitoring
P1620
U_REF (2.5V)
P1630
Solenoid Valve Controller Open Circuit
Solenoid Valve Controller Short Circuit
P1635
Glow Relay Controller Open Circuit
Glow Relay Controller Short Circuit
P1660
Redundant Emer. Stop Plausibility In After-Run
Redundant Emer. Stop Powerstage Defective
P1680
EEPROM Plausibility Checksum Error for Adj.
EEPROM Plausibility Checksum Error in CC212
EEPROM Plausibility Communication With EEPROM
EEPROM Plausibility Func. Switch Wrong or Missing
EEPROM Plausibility VIN Checksum Error
P1685
Vehicle Theft Alarm Immobilizer Signal Lost
Vehicle Theft Alarm Invalid SKIM Message
P1690
Fan Control Open Circuit
Fan Control Short Circuit
P1695
AC Control Short Circuit
AC Control OpenCircuit
P1703
Brake Signal Plaus With Redundant Contact
P1725
Inductive Aux. Speed Sensor Dynamic Plausibilty
Inductive Aux. Speed Sensor Overspeed Recognition
Inductive Aux Speed Sensor Plausibilty
Inductive Aux. Speed Sensor Static Plausibilty
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EMISSION CONTROL SYSTEM
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DESCRIPTION AND OPERATION (Continued)
PCM DRBIII
T
CODES
Generic Scan Tool Code
DRBIII Scan Tool Display
P0117
Engine Coolant Volts Low
P0118
Engine Coolant Volts High
P0462
Fuel Level Sending Unit volts Too Low
P0463
Fuel Level Sending Unit volts Too High
P0500
Vehicle Speed Signal
P0522
Oil Pressure Sense Low
P0523
Oil Pressure Sense High
P0601
Internal Controller Failure
P0622
Generator Field Not Switching Properly
P1296
5 VDC Output
P1391
Loss of Cam or Crank
P1492
Ambient/Batt temp Sen Volts Too High
P1493
Ambient/Batt temp Sen Volts Too Low
P1594
Charging System Voltage Too High
P1682
Charge Output Low
P1685
SKIM Invalid Key
P1686
No SKIM Bus Message Recieved
P1687
No MIC Bus Message
P1696
PCM Failure EEPROM Write Denied
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