Dodge Dakota (ND). Manual — part 718
P0405-EGR POSITION SENSOR CIRCUIT LOW
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ENGINE ELECTRICAL DIAGNOSTICS
ND
P0405-EGR POSITION SENSOR CIRCUIT LOW (CONTINUED)
For the Engine circuit diagram (Refer to 9 - ENGINE - SCHEMATICS AND DIAGRAMS).
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
With the ignition on. Battery voltage above 10.0 volts.
•
Set Condition:
EGR Position Sensor Signal is less than 0.1 of a volt. One trip Fault.
Possible Causes
(F856) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND
(F856) 5-VOLT SUPPLY CIRCUIT OPEN
(K34) EGR POSITION SENSOR SIGNAL CIRCUIT SHORTED TO GROUND
(K34) EGR POSITION SENSOR SIGNAL CIRCUIT SHORTED TO THE (K900) SENSOR GROUND CIRCUIT
EGR POSITION SENSOR
PCM
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING).
Diagnostic Test
1.
EGR POSITION SENSOR BELOW 0.2 OF A VOLT
Ignition on, engine not running.
With a scan tool, read the EGR Position Sensor voltage.
Is the voltage below 0.2 of a volt?
Yes
>> Go To 2
No
>> Go To 9
2.
(F856) 5-VOLT SUPPLY CIRCUIT
Turn the ignition off.
Disconnect the EGR Solenoid harness connector.
Ignition on, engine not running.
Measure the voltage of the (F856) 5-volt Supply circuit in the EGR
Solenoid harness connector.
Is the voltage between 4.5 to 5.2 volts?
Yes
>> Go To 3
No
>> Go To 6
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ENGINE ELECTRICAL DIAGNOSTICS
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P0405-EGR POSITION SENSOR CIRCUIT LOW (CONTINUED)
3.
EGR POSITION
With the scan tool, monitor the EGR Position Sensor voltage.
Is the voltage above 4.5 volts?
Yes
>> Replace the EGR Solenoid Assembly.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 4
4.
(K34) EGR POSITION SENSOR SIGNAL CIRCUIT SHORTED TO GROUND
Turn the ignition off.
Disconnect the C2 PCM harness connector.
Measure the resistance between ground and the (K34) EGR Position
Sensor Signal circuit in the EGR Solenoid harness connector.
Is the resistance below 100 ohms?
Yes
>> Repair the short to ground circuit in the (K34) EGR Posi-
tion Sensor Signal circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 5
5.
(K34) EGR SENSOR SIGNAL CIRCUIT SHORTED TO THE (K900) SENSOR GROUND CIRCUIT
Measure the resistance between the (K34) EGR Position Sensor Sig-
nal circuit and (K900) Sensor ground circuit in the EGR Solenoid har-
ness connector.
Is the resistance below 100 ohms?
Yes
>> Repair the short between the (K900) Sensor ground and
the (K34) EGR Position Sensor Signal circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 8
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ENGINE ELECTRICAL DIAGNOSTICS
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P0405-EGR POSITION SENSOR CIRCUIT LOW (CONTINUED)
6.
(F856) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND
Turn the ignition off.
Disconnect the C1 PCM harness connector.
Measure the resistance between ground and the (F856) 5-volt Supply
circuit in the EGR Solenoid harness connector.
Is the resistance below 100 ohms?
Yes
>> Repair the short to ground in the (F856) 5-volt Supply cir-
cuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 7
7.
(F856) 5-VOLT SUPPLY CIRCUIT OPEN
CAUTION: Do not probe the PCM harness connectors. Probing
the PCM harness connectors will damage the PCM terminals
resulting in poor terminal to pin connection. Install Miller Special
Tool #8815 to perform diagnosis.
Measure the resistance of the (F856) 5-volt Supply circuit from the
EGR Solenoid harness connector to the appropriate terminal of special
tool #8815.
Is the resistance below 5.0 ohms?
Yes
>> Go To 8
No
>> Repair the open in the (F856) 5-volt Supply circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
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ENGINE ELECTRICAL DIAGNOSTICS
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