Dodge Dakota (R1). Manual — part 137
TEST
ACTION
APPLICABILITY
2
WARNING: WHEN THE ENGINE IS OPERATING, DO NOT STAND IN A
DIRECT LINE WITH THE FAN. DO NOT PUT YOUR HANDS NEAR THE
PULLEYS, BELTS OR FAN. DO NOT WEAR LOOSE CLOTHING.
NOTE: The conditions that set the DTC are not present at this time. The
following list may help in identifying the intermittent condition.
With the engine running at normal operating temperature, monitor the DRB
parameters related to the DTC while wiggling the wiring harness. Look for param-
eter values to change and/or a DTC to set.
Review the DTC When Monitored and Set Conditions. If possible, try to duplicate the
conditions under which the DTC was set.
Refer to any Technical Service Bulletins (TSB) that may apply.
Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or
partially broken wires.
Visually inspect the related wiring harness connectors. Look for broken, bent, pushed
out, or corroded terminals.
Were any of the above conditions present?
All
Yes
→
Repair as necessary
Perform ROAD TEST VERIFICATION - VER-2.
No
→
Test Complete.
3
Turn the ignition off.
Disconnect the Engine Speed Sensor harness connector.
Disconnect the ECM harness connectors.
Measure the resistance between ground and the Engine Speed Sensor Signal circuit.
Is the resistance above 100 kohms?
All
Yes
→
No
→
Repair the Engine Speed Sensor Signal circuit for a short to
ground.
Perform ROAD TEST VERIFICATION - VER-2.
4
Turn the ignition off.
Disconnect the Engine Speed Sensor harness connector.
Disconnect the ECM harness connectors.
Measure the resistance between the Engine Speed Sensor Signal and Sensor Ground
circuits.
Is the resistance above 100 kohms?
All
Yes
→
No
→
Repair the Engine Speed Sensor Signal and Sensor Ground
circuits for a short together.
Perform ROAD TEST VERIFICATION - VER-2.
5
Turn the ignition off.
Disconnect the Engine Speed Sensor harness connector.
Disconnect the ECM harness connectors.
Measure the resistance of the Engine Speed Sensor Signal circuit.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair the Engine Speed Sensor Signal circuit for an open.
Perform ROAD TEST VERIFICATION - VER-2.
83
DRIVEABILITY - DIESEL
P0725-ENGINE SPEED SENSOR DYN. PLAUSIBILITY —
Continued
TEST
ACTION
APPLICABILITY
6
Turn the ignition off.
Disconnect the Engine Speed Sensor harness connector.
Disconnect the ECM harness connectors.
Turn the ignition on.
Measure the voltage of the Engine Speed Sensor Signal circuit.
Is the voltage below 0.5 volt?
All
Yes
→
No
→
Repair the Engine Speed Sensor Signal circuit for a short to
voltage.
Perform ROAD TEST VERIFICATION - VER-2.
7
NOTE: Ensure the ECM and Engine Speed Sensor harness connectors are
connected.
Connect, by back probing, a voltmeter capable of reading frequency to ECM harness
connector C2 cavity 67.
Crank the engine while monitoring the voltmeter.
Is the frequency between 16 and 20 Hz at 270-300 cranking RPM?
All
Yes
→
Replace and program the Engine Control Module in accordance
with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
Replace the Engine Speed Sensor in accordance with the Service
Information.
Perform ROAD TEST VERIFICATION - VER-2.
84
DRIVEABILITY - DIESEL
P0725-ENGINE SPEED SENSOR DYN. PLAUSIBILITY —
Continued
Symptom:
P0725-ENGINE SPEED SENSOR OVERSPEED RECOGNITION
When Monitored and Set Condition:
P0725-ENGINE SPEED SENSOR OVERSPEED RECOGNITION
When Monitored:
With the engine running.
Set Condition:
The engine speed sensor signal indicates engine speed is above 5100 RPM
for at least 500 milliseconds. NOTE: Engine damage is possible when the engine speed
exceeds 5100 RPM.
POSSIBLE CAUSES
CHECK FOR OTHER DTCS
ENGINE CONTROL MODULE
REPLACE THE ENGINE SPEED SENSOR
INTERMITTENT CONDITION
TEST
ACTION
APPLICABILITY
1
CAUTION: Engine damage is possible when engine speed exceeds 5100
RPM.
NOTE: This DTC indicates the Engine Speed Sensor has seen an engine
speed above 5100 RPM.
Turn the ignition on.
With the DRB, check for other Engine Speed Sensor DTCs.
Are other Engine Speed Sensor DTCs present?
All
Yes
→
Refer to symptom list for problems related to other DTCs before
continuing.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
2
Turn the ignition on.
With the DRB, erase ECM DTCs.
Test drive the vehicle and monitor the DRB for ECM DTCs.
Did this DTC reset?
All
Yes
→
No
→
85
DRIVEABILITY - DIESEL
TEST
ACTION
APPLICABILITY
3
Replace the Engine Speed Sensor in accordance with the Service Information.
With the DRB, erase ECM DTCs.
Perform several drive cycles, turning the ignition off for at least 10 seconds between
each drive cycle.
Monitor the DRB for ECM DTCs.
Did this DTC reset?
All
Yes
→
Replace and program the Engine Control Module in accordance
with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
The repair is complete.
Perform ROAD TEST VERIFICATION - VER-2.
4
WARNING: WHEN THE ENGINE IS OPERATING, DO NOT STAND IN A
DIRECT LINE WITH THE FAN. DO NOT PUT YOUR HANDS NEAR THE
PULLEYS, BELTS OR FAN. DO NOT WEAR LOOSE CLOTHING.
NOTE: The conditions that set the DTC are not present at this time. The
following list may help in identifying the intermittent condition.
With the engine running at normal operating temperature, monitor the DRB
parameters related to the DTC while wiggling the wiring harness. Look for param-
eter values to change and/or a DTC to set.
Review the DTC When Monitored and Set Conditions. If possible, try to duplicate the
conditions under which the DTC was set.
Refer to any Technical Service Bulletins (TSB) that may apply.
Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or
partially broken wires.
Visually inspect the related wiring harness connectors. Look for broken, bent, pushed
out, or corroded terminals.
Check the Engine Speed Sensor wiring harness for incorrect routing which may
cause EMI interference.
Were any of the above conditions present?
All
Yes
→
Repair as necessary
Perform ROAD TEST VERIFICATION - VER-2.
No
→
Test Complete.
86
DRIVEABILITY - DIESEL
P0725-ENGINE SPEED SENSOR OVERSPEED RECOGNITION —
Continued
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