Dodge Dakota (R1). Manual — part 158
TEST
ACTION
APPLICABILITY
4
Turn the ignition off.
Disconnect the ECM harness connectors.
Remove the ASD/Diesel Power Relay from the PDC.
Connect a jumper wire between cavity 30 and cavity 87 in the ASD/Diesel Power
Relay connector.
Using a 12-volt test light connected to ground, check the ASD Relay Output circuit in
ECM harness connector C1 cavities 2 and 28.
Did the test light illuminate for both circuits?
All
Yes
→
No
→
Repair the ASD Relay Output circuit(s) for an open.
Perform ROAD TEST VERIFICATION - VER-2.
5
Disconnect the PCM harness connectors.
Using a 12-volt test light connected to ground, check the PCM Battery Supply circuit
in PCM harness connector C1 cavity 22.
Is the test light on?
All
Yes
→
No
→
Repair the PCM Battery Supply circuit(s) for an open.
Perform ROAD TEST VERIFICATION - VER-2.
6
Disconnect the PCM harness connectors.
Using a 12-volt test light connected to 12-volts, check both PCM Ground circuits in
PCM harness connector C1 cavities 31 and 32.
Did the test light illuminate for both cavities?
All
Yes
→
No
→
Repair the PCM Ground circuit(s) for an open.
Perform ROAD TEST VERIFICATION - VER-2.
7
Turn the ignition off.
Remove the ASD/Diesel Power Relay from the PDC.
Disconnect the PCM harness connectors.
Connect a jumper wire between cavity 30 and cavity 87 of the ASD/Diesel Power
Relay connector.
Using a 12-volt test light connected to ground, check the ASD Relay Output circuit in
PCM harness connectors C1 cavity 2 and C3 cavity 12.
Did the test light illuminate for both circuits?
All
Yes
→
Test Complete.
No
→
Repair the ASD Relay Output circuit(s) for an open.
Perform ROAD TEST VERIFICATION - VER-2.
167
DRIVEABILITY - DIESEL
*CHECKING THE ECM AND PCM POWER AND GROUND CIRCUITS —
Continued
Symptom:
*CHECKING THE EGR SYSTEM
POSSIBLE CAUSES
ASD RELAY OUTPUT CIRCUIT OPEN
EGR VALVE
GROUND CIRCUIT OPEN
VACUUM SUPPLY HOSE
TEST
ACTION
APPLICABILITY
1
Disconnect the Vacuum Supply Hose at the EGR solenoid.
Connect a vacuum gauge to the Vacuum Supply Hose.
Start the engine and allow the engine to idle.
Is the vacuum above 10 inches of mercury at idle?
All
Yes
→
No
→
Repair leaking or restricted Vacuum Supply Hose or faulty
Vacuum Supply Pump.
Perform ROAD TEST VERIFICATION - VER-2.
2
Turn the ignition off.
Disconnect the EGR Solenoid harness connector.
Turn the ignition on.
Using a 12-volt test light connected to ground, check the ASD Relay Output circuit at
the EGR Solenoid harness connector.
Is the test light on?
All
Yes
→
No
→
Repair the ASD Relay Output circuit for an open.
Perform ROAD TEST VERIFICATION - VER-2.
3
Turn the ignition off.
Disconnect the EGR Solenoid harness connector.
Using a 12-volt test light connected to 12-volts, check the Ground circuit in the EGR
Solenoid harness connector.
Is the test light on?
All
Yes
→
No
→
Repair the Ground circuit for an open.
Perform ROAD TEST VERIFICATION - VER-2.
4
NOTE: The Vacuum Output Hose must not be leaking or restricted for the
result of this test to be valid.
Turn the ignition off.
Disconnect the Vacuum Supply and Vacuum Output Hoses in the EGR Solenoid
vacuum connector.
Connect the Vacuum Supply Hose to the Vacuum Output Hose.
Test drive the vehicle and observe vehicle performance.
Is there a power reduction on vehicle acceleration?
All
Yes
→
Test Complete.
No
→
Replace the EGR Valve.
Perform ROAD TEST VERIFICATION - VER-2.
168
DRIVEABILITY - DIESEL
Symptom:
*CHECKING THE ENGINE COOLANT TEMPERATURE SENSOR
CALIBRATION
POSSIBLE CAUSES
ECT SENSOR - COLD
ECT SENSOR - HOT
TEST
ACTION
APPLICABILITY
1
NOTE: The thermostat must be operating correctly for this test to be valid.
With the DRB, read and note the engine coolant temperature.
Using a temperature probe, measure the engine block temperature near the ECT
Sensor.
Are the readings within 7°C (13°F) of each other?
All
Yes
→
No
→
Replace the Engine Coolant Temperature Sensor.
Perform ROAD TEST VERIFICATION - VER-2.
2
NOTE: The thermostat must be operating correctly for this test to be valid.
Start the engine.
Using a temperature probe, measure the engine block temperature near the ECT
Sensor. When the engine temperature reaches 75°C (180°F), use the DRB and read
the engine coolant temperature.
Are the readings within 7°C (13°F) of each other?
All
Yes
→
Test Complete.
No
→
Replace the Engine Coolant Temperature Sensor.
Perform ROAD TEST VERIFICATION - VER-2.
169
DRIVEABILITY - DIESEL
Symptom:
*CHECKING THE ENGINE MECHANICAL SYSTEMS
POSSIBLE CAUSES
CHECKING ENGINE MECHANICAL SYSTEMS
TEST
ACTION
APPLICABILITY
1
NOTE: The following items should be checked as a possible cause of a
Driveability or No-Start problem.
Engine Valve Timing - must be within specification
Engine Compression - must be within specifications
Camshaft Lobes - check for abnormal wear
Engine Speed Sensor Pick-Up - check the flywheel slots for debris and deterioration
Engine Exhaust System - must be free of any restriction
Engine Drive Sprocket - must be properly positioned
Power Brake Booster - must be free of any vacuum leaks
Fuel - must be free of contamination
Fuel Injector - must not be plugged or restricted
Fuel Injection Pump - must be properly timed
NOTE: Check for any Technical Service Bulletins that may relate to the
problem.
Are there any problems evident?
All
Yes
→
Repair as necessary.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
Test Complete.
170
DRIVEABILITY - DIESEL
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