coolant MERCEDES-BENZ SPRINTER 2006 Owner's Manual

TABLE OF CONTENTS - Continued
P0100-MASS AIR FLOW SENSOR SIGNAL VOLTAGE TOO LOW...............19
P2011-MASS AIR FLOW SENSOR PLAUSIBILITY AIR MASS TOO HIGH.........19
P2011-MASS AIR FLOW SENSOR PLAUSIBILITY AIR MASS TOO LOW..........19
P2024-MASS AIR FLOW SENSOR SIGNAL VOLTAGE TOO HIGH...............19
P2024-MASS AIR FLOW SENSOR SIGNAL VOLTAGE TOO LOW...............19
P2065-MASS AIR FLOW SENSOR SUPPLY VOLTAGE TOO HIGH...............19
P2065-MASS AIR FLOW SENSOR SUPPLY VOLTAGE TOO LOW...............19
P2067-MASS AIR FLOW SENSOR SIGNAL CIRCUIT OPEN OR SHORTED.......19
P2067-MASS AIR FLOW SENSOR SIGNAL VOLTAGE TOO HIGH...............19
P2067-MASS AIR FLOW SENSOR SIGNAL VOLTAGE TOO LOW...............19
P2068-MASS AIR FLOW SENSOR PLAUSIBILITY SIGNAL RATIO ERROR........19
P2633-MAF SENSOR SIGNAL PLAUSIBILITY................................19
P0105-INTAKE PRESSURE SENSOR CAN MESSAGE ERROR.................25
P0105-INTAKE PRESSURE SENSOR PLAUSIBILITY..........................25
P0105-INTAKE PRESSURE SENSOR SIGNAL VOLTAGE TOO HIGH.............28
P0105-INTAKE PRESSURE SENSOR SIGNAL VOLTAGE TOO LOW.............31
P0110-INTAKE AIR TEMP SENSOR SIGNAL VOLTAGE TOO HIGH..............34
P2063-INTAKE AIR TEMP SENSOR CIRCUIT SIGNAL VOLTAGE TOO HIGH......34
P0110-INTAKE AIR TEMP SENSOR SIGNAL VOLTAGE TOO LOW...............37
P2063-INTAKE AIR TEMP SENSOR CIRCUIT SIGNAL VOLTAGE TOO LOW......37
P0115-ENGINE COOLANT TEMP SENSOR CIRCUIT PLAUSIBILITY.............40
P2012-ENGINE COOLANT TEMP SENSOR CIRCUIT PLAUSIBILITY.............40
P0115-ENGINE COOLANT TEMP SENSOR CIRCUIT PLAUSIBILITY WITH ENGINE
OIL SENSOR...........................................................42
P0115-ENGINE COOLANT TEMP SENSOR CIRCUIT SIGNAL VOLTAGE TOO
HIGH.................................................................44
P2054-ENGINE COOLANT TEMP SENSOR CIRCUIT SIGNAL VOLTAGE TOO
HIGH.................................................................44
P2054-ENGINE COOLANT TEMP SENSOR CIRCUIT SIGNAL VOLTAGE TOO
LOW..................................................................44
P0115-ENGINE COOLANT TEMP SENSOR CIRCUIT SIGNAL VOLTAGE TOO
LOW..................................................................47
P0180-FUEL TEMPERATURE SENSOR CIRCUIT - SIGNAL VOLTAGE TOO HIGH. .49
P0180-FUEL TEMPERATURE SENSOR CIRCUIT - SIGNAL VOLTAGE TOO LOW . .51
P2625-FUEL TEMPERATURE SENSOR PLAUSIBILITY........................51
P0190-FUEL PRESS SENSOR CIRCUIT MALF SIGNAL VOLTAGE TOO HIGH.....53
P2008-FUEL PRESSURE SENSOR CIRCUIT SIGNAL VOLTAGE TOO HIGH......53
P0190-FUEL PRESS SENSOR CIRCUIT MALF SIGNAL VOLTAGE TOO LOW.....57
P2008-FUEL PRESSURE SENSOR CIRCUIT SIGNAL VOLTAGE TOO LOW.......57
P0201-CYLINDER 1-INJECTOR CIRCUIT EXCESSIVE CURRENT...............60
P0201-CYLINDER 1-INJECTOR CIRCUIT OPEN OR SHORTED TO GROUND.....60
P0201-CYLINDER 1-INJECTOR CIRCUIT SHORTED TO GROUND..............60
P0201-CYLINDER 1-INJECTOR CIRCUIT SHORTED TO VOLTAGE..............60
P0202-CYLINDER 2-INJECTOR CIRCUIT EXCESSIVE CURRENT...............60
P0202-CYLINDER 2-INJECTOR CIRCUIT OPEN OR SHORTED TO GROUND.....60
P0202-CYLINDER 2-INJECTOR CIRCUIT SHORTED TO GROUND..............60
P0202-CYLINDER 2-INJECTOR CIRCUIT SHORTED TO VOLTAGE..............60
P0203-CYLINDER 3-INJECTOR CIRCUIT EXCESSIVE CURRENT...............60
P0203-CYLINDER 3-INJECTOR CIRCUIT OPEN OR SHORTED TO GROUND.....60
P0203-CYLINDER 3-INJECTOR CIRCUIT SHORTED TO GROUND..............60
P0203-CYLINDER 3-INJECTOR CIRCUIT SHORTED TO VOLTAGE..............60
P0204-CYLINDER 4-INJECTOR CIRCUIT EXCESSIVE CURRENT...............60
P0204-CYLINDER 4-INJECTOR CIRCUIT OPEN OR SHORTED TO GROUND.....60
iii

TABLE OF CONTENTS - Continued
*CHECKING THE FUEL PRESSURE SOLENOID CIRCUITS...................233
*CHECKING THE FUEL QUANTITY SOLENOID CIRCUITS....................234
*CHECKING THE POWER AND GROUNDS................................235
*ENGINE CRANKS BUT WILL NOT START.................................239
*ENGINE WILL NOT CRANK.............................................242
VERIFICATION TESTS
VERIFICATION TESTS..................................................246
8.0 COMPONENT LOCATIONS..............................................249
8.1CONTROL MODULES.............................................249
8.2CONTROLS AND SOLENOIDS......................................249
8.3DATA LINK CONNECTOR..........................................250
8.4SENSORS.......................................................251
8.5SWITCHES......................................................253
9.0 CONNECTOR PINOUTS................................................255
ACCELERATOR PEDAL POSITION SENSOR (OBD).........................255
AIRBAG CONTROL MODULE - YELLOW...................................255
BOOST PRESSURE SENSOR (OBD)......................................255
BOOST PRESSURE SERVOMOTOR (OBD)................................256
CAMSHAFT POSITION SENSOR - BLACK.................................256
CONTROLLER ANTILOCK BRAKE........................................257
CRANKCASE HEATER - BLACK..........................................257
CRANKSHAFT POSITION SENSOR - BLACK...............................258
DATA LINK CONNECTOR - BLACK........................................258
EGR VALVE - BLACK...................................................258
ENGINE CONTROL MODULE C1 (OBD)...................................259
ENGINE CONTROL MODULE C2 (OBD)...................................260
ENGINE COOLANT TEMPERATURE SENSOR - BLACK......................260
ENGINE OIL SENSOR - BLACK..........................................261
FUEL INJECTOR NO. 1 - BLACK.........................................261
FUEL INJECTOR NO. 2 - BLACK.........................................261
FUEL INJECTOR NO. 3 - BLACK.........................................261
FUEL INJECTOR NO. 4 - BLACK.........................................262
FUEL INJECTOR NO. 5 - BLACK.........................................262
FUEL PRESSURE SENSOR - BLACK.....................................262
FUEL PRESSURE SOLENOID............................................262
FUEL PUMP (OBD).....................................................262
FUEL PUMP RELAY (OBD)..............................................263
FUEL QUANTITY CONTROL VALVE (OBD).................................263
FUEL TEMPERATURE SENSOR..........................................263
ENGINE CONTROL RELAY (FUSE BLOCK NO. 1)...........................265
FUSES (FUSE BLOCK NO. 1)............................................265
FUSES (FUSE BLOCK NO. 2)............................................267
FUSES (FUSE/RELAY BLOCK)...........................................269
STARTER MOTOR RELAY (FUSE/RELAY BLOCK)...........................269
GLOW PLUG CONTROL MODULE C1 - BLACK.............................270
GLOW PLUG CONTROL MODULE C2 - BLACK.............................270
INTAKE AIR PRESSURE SENSOR (OBD)..................................270
INTAKE AIR TEMPERATURE SENSOR - BLACK............................270
x

3.2.2 ECM OPERATING MODES
As input signals to the ECM change, the ECM
adjusts its response to the output devices. For
example, the ECM must calculate a different fuel
quantity and fuel timing for engine idle condition
than it would for a wide open throttle condition.
There are several different modes of operation that
determine how the ECM responds to the various
input signals.
Ignition Switch On (Engine Off)
When the ignition is turned on the ECM activates
the glow plug relay for a time period that is deter-
mined by engine coolant temperature, intake air
temperature and battery voltage.
Engine Start-Up Mode
The ECM uses the intake air temperature sensor,
engine temperature sensor and the crankshaft po-
sition sensor (engine speed) inputs to determine
fuel injection quantity.
Normal Driving Modes
Engine idle, warm-up, acceleration, deceleration
and wide open throttle modes are controlled based
on all of the sensor inputs to the ECM. The ECM
uses these sensor inputs to adjust fuel quantity and
fuel injector timing. EGR valve control is performed
using feedback from the oxygen sensor. An oxygen
sensor is located in the exhaust manifold to sample
oxygen content exiting the engine cylinders. The
ECM uses the O2 sensor, along with other sensor
inputs, to govern the amount of exhaust gas recir-
culation to reduce HC (HydroCarbons) and CO
(Carbon Monoxide). Engine coolant is routed
through the base of the EGR valve to provide
additional cooling of the exhaust gas, which further
helps the reductions of emissions. The EGR valve
has a self-cleaning function. When the engine is
shut off, the EGR valve rotates twice to reduce
carbon deposits at the valve seat.
Overheat Production Mode
If the engine temperature is above 105ÉC (221ÉF)
and vehicle speed is above 40 km/h (25 MPH) the
ECM will limit fuel quantity for engine protection.
Limp-In Mode
The ECM utilizes different degrees of engine
limp-in. The ECM is able to limit engine rpm,
engine power output (turbo boost reduction), acti-
vate engine cooling fan or all of these functions
based on the type of fault that is detected. Critical
engine performance faults such as accelerator pedal
position sensor fault will result in a fixed idle speed
of approximately 680 rpm regardless of actual pedalposition. Other less critical faults will result in
power reduction throughout the full range of driv-
ing conditions.
Overspeed Detection Mode
If the ECM detects engine RPM that exceeds
5200 RPM, the ECM will set a DTC in memory,
limit engine RPM to no more than 2500 RPM, and
illuminate the MIL until the DTC is cleared.
After-Run Mode
The ECM transfers RAM information to ROM
and performs an Input/Output state check.
3.2.3 MONITORED CIRCUITS
The ECM is able to monitor and identify most
driveability related trouble conditions. Some cir-
cuits are directly monitored through ECM feedback
circuitry. In addition, the ECM monitors the voltage
state of some circuits and compares those states
with expected values. Other systems are monitored
indirectly when the ECM conducts a rationality test
to identify problems.
Although most subsystems of the engine control
module are either directly or indirectly monitored,
there may be occasions when diagnostic trouble
codes are not immediately identified. For a trouble
code to set, a specific set of conditions must occur
and unless these conditions occur, a DTC will not
set.
3.2.4 SKREEM OVERVIEW
The sentry key remote entry module system
(SKREEM) is designed to prevent unauthorized
vehicle operation. The system consists of a sentry
key remote entry module (SKREEM), ignition
key(s) equipped with a transponder chip and the
ECM. When the ignition switch is turned on, the
SKREEM interrogates the ignition key. If the igni-
tion key is Valid or Invalid, the SKREEM sends a
message to the ECM indicating ignition key status.
Upon receiving this message the ECM will termi-
nate engine operation or allow the engine to con-
tinue to operate.
3.2.5 SKREEM ON-BOARD DIAGNOSTICS
The SKREEM has been programmed to transmit
and monitor many different coded messages as well
as CAN Bus messages. This monitoring is called
On-Board Diagnostics. Certain criteria must be met
for a DTC to be entered into SKREEM memory. The
criteria may be a range of; input voltage, CAN Bus
message or coded messages to the SKREEM. If all
the criteria for monitoring a circuit or function are
met and a fault is detected, a DTC will be stored in
the SKREEM memory and the START ERROR indi-
cator will be turned on in the instrument cluster.
2
GENERAL INFORMATION

ecm internal error 3
ecm internal error 4
ecm internal error 4
ecm internal error 5
ecm internal fault
ecm invalid coding
ecm invalid data
ecm read error
ecm read/write error
ecm supply voltage too low
ecm voltage supply is too high
ecm voltage supply is too low
ecm write error
egr flow rate is too high
egr flow rate is too low
egr valve excessive current
egr valve signal circuit open circuit
egr valve signal circuit shorted to ground
egr valve signal circuit shorted to ground
egr valve signal circuit shorted to voltage
engine control relay plausibility
engine control relay shuts off too early
engine control relay shuts off too late
engine coolant temp sensor circuit plausibility
engine coolant temp sensor circuit plausibility
engine coolant temp sensor circuit plausibility with
engine oil sensor
engine coolant temp sensor circuit signal voltage too
high
engine coolant temp sensor circuit signal voltage too
high
engine coolant temp sensor circuit signal voltage too
low
engine coolant temp sensor circuit signal voltage too
low
*engine cranks but will not start
engine oil sensor circuit invalid level
engine oil sensor circuit level out of range
engine oil sensor circuit level out of range
engine oil sensor monitoring error
engine oil sensor oil temperature plausibility
engine oil sensor open circuit
engine oil sensor poor oil quality
engine oil sensor quality measurement error
engine oil sensor quality plausibility
engine oil sensor signal error
engine oil sensor signal plausibility
engine oil sensor signal voltage is too high
engine oil sensor signal voltage is too low
engine oil sensor synchronization error
engine oil sensor water contamination
*engine will not crank
esm can message missing or incorrect
etc can message missing or incorrect
fuel injector 1 read too large
fuel injector 1 read too large
fuel injector 1 read too small
fuel injector 1 read too smallfuel injector 2 read too large
fuel injector 2 read too large
fuel injector 2 read too small
fuel injector 2 read too small
fuel injector 3 read too large
fuel injector 3 read too large
fuel injector 3 read too small
fuel injector 3 read too small
fuel injector 4 read too large
fuel injector 4 read too large
fuel injector 4 read too small
fuel injector 4 read too small
fuel injector 5 read too large
fuel injector 5 read too large
fuel injector 5 read too small
fuel injector 5 read too small
fuel press sensor circuit malf signal voltage too high
fuel press sensor circuit malf signal voltage too low
fuel press solenoid signal plausibility high
fuel press solenoid signal plausibility low
fuel pressure sensor circuit signal voltage too high
fuel pressure sensor circuit signal voltage too low
fuel pressure solenoid circuit excessive current
fuel pressure solenoid circuit open circuit
fuel pressure solenoid circuit shorted to ground or
b+
fuel pump relay circuit open circuit
fuel pump relay circuit shorted to ground
fuel pump relay circuit shorted to voltage
fuel pump relay excessive current
fuel quantity solenoid ecm thermal overload
fuel quantity solenoid open circuit
fuel quantity solenoid short to ground
fuel quantity solenoid short to ground
fuel quantity solenoid short to voltage
fuel rail pressure malfunction deceleration error
fuel rail pressure malfunction deceleration error
fuel rail pressure malfunction fuel flow below min-
imum quantity
fuel rail pressure malfunction maximum fuel flow
exceeded
fuel rail pressure malfunction maximum fuel pres-
sure exceeded
fuel rail pressure malfunction maximum fuel pres-
sure exceeded
fuel rail pressure malfunction maximum fuel pres-
sure exceeded
fuel rail pressure malfunction plausibility with fuel
pressure solenoid
fuel rail pressure malfunction rail pressure is too
high
fuel rail pressure malfunction rail pressure is too
low
fuel rail pressure malfunction rail pressure is too
low
fuel rail pressure malfunction rail pressure is too
low
fuel rail pressure malfunction rail pressure too high
5
GENERAL INFORMATION

ohmmeter
voltmeter
jumper wires and probes
oscilloscope
6.0 GLOSSARY OF TERMS
A/Cair conditioning
APPaccelerator pedal position (sensor)
BCMbody control module
BPboost pressure (sensor)
CKPcrankshaft position (sensor)
CMPcamshaft position (sensor)
CTMcentral timer module
DLCdata link connector
ECMengine control module
ECTengine coolant temperature (sensor)
EGRexhaust gas recirculation (solenoid/
valve)
EOSengine oil sensor
IATintake air temperature (sensor)
IPintake pressure sensorMAFmass air flow (sensor)
MILmalfunction indicator lamp
msmillisecond(s)
O2oxygen sensor
PDCpower distribution center
S/Cspeed control
SKREEMsentry key remote entry module
SRCsignal range check
WIFwater in fuel (sensor)
10
GENERAL INFORMATION

Symptom List:
P0115-ENGINE COOLANT TEMP SENSOR CIRCUIT PLAUSIBILITY
P2012-ENGINE COOLANT TEMP SENSOR CIRCUIT PLAUSIBILITY
Test Note: All symptoms listed above are diagnosed using the same tests.
The title for the tests will be P0115-ENGINE COOLANT TEMP
SENSOR CIRCUIT PLAUSIBILITY.
POSSIBLE CAUSES
ECT SENSOR
ECT SENSOR - COLD
ECT SENSOR - HOT
HGH RESISTANCE IN ECT SENSOR CIRCUITS
ENGINE COLD TOO LONG
TEST ACTION APPLICABILITY
1Note: The best way to diagnose this DTC is to allow the vehicle to remain
outside overnight in order to have a completely cold soaked engine.
Note: Extremely cold outside ambient temperatures may cause this DTC to
set.
Verify that the coolant level is correct.
Start the engine.
With the DRBIIIt, set the engine RPM to 1500 and allow the engine to warm up for
10-15 minutes.
With the DRBIIIt, monitor the Engine Coolant Temperature value during the warm
up cycle. Make sure the transition of temperature change is smooth.
Did the engine temperature reach a minimum of 80É C (176É F)?All
Ye s!Go To 2
No!Refer to the Service Information for cooling system performance
diagnosis. The most probable cause is a Thermostat problem.
Also, refer to any related TSBs.
Perform ROAD TEST VERIFICATION - VER-2.
2NOTE: The engine temperature must be below 50ÉC (120ÉF) for this test.
NOTE: The thermostat must be operating correctly for this test to be valid.
With the DRBIIItin Sensors, read and note the engine coolant temperature.
Using a temperature probe, measure the engine block temperature near the ECT
Sensor.
Are the readings within 7ÉC (13ÉF) of each other?All
Ye s!Go To 3
No!Go To 4
40
DRIVEABILITY - DIESEL

TEST ACTION APPLICABILITY
3NOTE: The thermostat must be operating correctly for this test to be valid.
Start the engine and bring the engine to operating temperature (thermostat open).
Turn the engine off and wait 10 minutes to allow the engine temperature to stabilize.
Using a temperature probe, measure the engine block temperature near the ECT
Sensor.
With the DRBIIIt, select Engine, then Sensors and read the engine coolant
temperature.
Are the readings within 7ÉC (13ÉF) of each other?All
Ye s!Test Complete.
No!Go To 4
4 Disconnect the ECT harness connector.
Disconnect the ECM harness connectors.
Measure the resistance of the ECT Sensor Signal circuit between the ECM harness
connector and the ECT harness connector.
Measure the resistance of the Sensor Ground circuit between the ECM harness
connector and the ECT harness connector.
Is the resistance below 10.0 ohms for each measurement?All
Ye s!Replace the Engine Coolant Temperature Sensor.
Perform ROAD TEST VERIFICATION - VER-2.
No!Repair the ECT Sensor circuit(s) that measured above 10.0 ohms
for high resistance.
Perform ROAD TEST VERIFICATION - VER-2.
41
DRIVEABILITY - DIESEL
P0115-ENGINE COOLANT TEMP SENSOR CIRCUIT PLAUSIBILITY Ð
Continued

Symptom:
P0115-ENGINE COOLANT TEMP SENSOR CIRCUIT PLAUSIBILITY
WITH ENGINE OIL SENSOR
When Monitored and Set Condition:
P0115-ENGINE COOLANT TEMP SENSOR CIRCUIT PLAUSIBILITY WITH EN-
GINE OIL SENSOR
When Monitored: With the engine running.
Set Condition: The ECT Sensor signal indicates a different engine temperature than the
EOS Sensor.
POSSIBLE CAUSES
CURRENT DTC
ECT SENSOR
ECT SENSOR - COLD
ECT SENSOR - HOT
ENGINE OIL SENSOR SENSOR
HGH RESISTANCE IN ECT SENSOR CIRCUITS
ENGINE COLD TOO LONG
TEST ACTION APPLICABILITY
1 Verify that the coolant level is correct.
Start the engine.
NOTE: The thermostat must be operating correctly for this test to be valid.
With the DRBIIIt, erase ECM DTCs.
With the DRBIIIt, set the engine RPM to 1500 and allow the engine to warm up for
10-15 minutes.
With the DRBIIIt, monitor the Engine Coolant Temperature value during the warm
up cycle. Make sure the transition of temperature change is smooth.
Did the engine temperature reach a minimum of 80É C (176É F)?All
Ye s!Go To 2
No!Refer to the Service Information for cooling system performance
diagnosis. The most probable cause is a Thermostat problem.
Also, refer to any related TSBs.
Perform ROAD TEST VERIFICATION - VER-2.
2 Turn the ignition on.
With the DRBIIIt, read the ECM DTCs.
Did this DTC return after performing the previous test?All
Ye s!Go To 3
No!Check for possible connecor or wiring problems at the ECT sensor
that may cause an intermittent problem. Repair as necessary.
Test Complete.
Perform ROAD TEST VERIFICATION - VER-2.
42
DRIVEABILITY - DIESEL

TEST ACTION APPLICABILITY
3NOTE: The engine temperature must be below 50ÉC (120ÉF) for this test.
NOTE: The thermostat must be operating correctly for this test to be valid.
With the DRBIIItin Sensors, read and note the engine coolant temperature.
Using a temperature probe, measure the engine block temperature near the ECT
Sensor.
Are the readings within 7ÉC (13ÉF) of each other?All
Ye s!Go To 4
No!Go To 5
4NOTE: The thermostat must be operating correctly for this test to be valid.
Start the engine and bring the engine to operating temperature (thermostat open).
Turn the engine off and wait 10 minutes to allow the engine temperature to stabilize.
Using a temperature probe, measure the engine block temperature near the ECT
Sensor.
With the DRBIIIt, select Engine, then Sensors and read the engine coolant
temperature.
Are the readings within 7ÉC (13ÉF) of each other?All
Ye s!Replace the Engine Oil Sensor.
Perform ROAD TEST VERIFICATION - VER-2.
No!Go To 5
5 Disconnect the ECT harness connector.
Disconnect the ECM harness connectors.
Measure the resistance of the ECT Sensor Signal circuit between the ECM harness
connector and the ECT harness connector.
Measure the resistance of the Sensor Ground circuit between the ECM harness
connector and the ECT harness connector.
Is the resistance below 10.0 ohms for each measurement?All
Ye s!Replace the Engine Coolant Temperature Sensor.
Perform ROAD TEST VERIFICATION - VER-2.
No!Repair the ECT Sensor circuit(s) that measured above 10.0 ohms
for high resistance.
Perform ROAD TEST VERIFICATION - VER-2.
43
DRIVEABILITY - DIESEL
P0115-ENGINE COOLANT TEMP SENSOR CIRCUIT PLAUSIBILITY
WITH ENGINE OIL SENSOR Ð
Continued

Symptom List:
P0115-ENGINE COOLANT TEMP SENSOR CIRCUIT SIGNAL VOLT-
AGE TOO HIGH
P2054-ENGINE COOLANT TEMP SENSOR CIRCUIT SIGNAL VOLT-
AGE TOO HIGH
P2054-ENGINE COOLANT TEMP SENSOR CIRCUIT SIGNAL VOLT-
AGE TOO LOW
Test Note: All symptoms listed above are diagnosed using the same tests.
The title for the tests will be P0115-ENGINE COOLANT TEMP
SENSOR CIRCUIT SIGNAL VOLTAGE TOO HIGH.
When Monitored and Set Condition:
P0115-ENGINE COOLANT TEMP SENSOR CIRCUIT SIGNAL VOLTAGE TOO
HIGH
When Monitored: With the ignition on.
Set Condition: The Engine Coolant Temperature Sensor Signal voltage is above 4.98 volts
for more than 3 seconds.
P2054-ENGINE COOLANT TEMP SENSOR CIRCUIT SIGNAL VOLTAGE TOO
HIGH
When Monitored: With the ignition on.
Set Condition: The Engine Coolant Temperature Sensor Signal voltage is above 4.98 volts
for more than 3 seconds.
P2054-ENGINE COOLANT TEMP SENSOR CIRCUIT SIGNAL VOLTAGE TOO
LOW
When Monitored: With the ignition on.
Set Condition:
POSSIBLE CAUSES
INTERMITTENT CONDITION
ECM ECT SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE
ECT SENSOR GROUND CIRCUIT OPEN
ECT SENSOR
ECT SENSOR SIGNAL CIRCUIT OPEN
ENGINE CONTROL MODULE
44
DRIVEABILITY - DIESEL