Chrysler 300/300 Touring/300C, Dodge Magnum. Manual — part 1464
Possible Causes
ECT SENSOR - COLD
ECT SENSOR - HOT
Diagnostic Test
1.
ECT SENSOR - COLD
NOTE: The thermostat must be operating correctly for this test to be valid.
With the scan tool in Sensors, read and note the engine coolant temperature.
Using a temperature probe, measure the engine block temperature near the ECT Sensor.
NOTE: The engine temperature should be below 50°C (120°F).
Are the readings within 7°C (13°F) of each other?
Yes
>> Go To 2
No
>> Check the wiring and connectors associated with the ECT Sensor for corrosion, damage or other prob-
lems. Repair as necessary. If wiring and connectors are o.k., replace the Engine Coolant Temperature
Sensor.
Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)
2.
ECT SENSOR - HOT
NOTE: 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 scan tool, select Engine, then Sensors and read the engine coolant temperature.
Are the readings within 7°C (13°F) of each other?
Yes
>> Test Complete.
No
>> Check the wiring and connectors associated with the ECT Sensor for corrosion, damage or other prob-
lems. Repair as necessary. If wiring and connectors are o.k., replace the Engine Coolant Temperature
Sensor.
Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)
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ENGINE ELECTRICAL DIAGNOSTICS - DIESEL
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*CHECKING THE EGR SYSTEM
For a complete wiring diagram Refer to Section 8W
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ENGINE ELECTRICAL DIAGNOSTICS - DIESEL
9 - 1881
Possible Causes
(A15) FUSED ASD RELAY OUTPUT CIRCUIT OPEN
(Z42) EGR SOLENOID GROUND CIRCUIT OPEN
EGR SOLENOID/VALVE
INTAKE OR EXHAUST SYSTEM PROBLEM
1.
EGR VALVE
PERCENTAGE EGR ACTUATION
(%)
MAF PER CYLINDER MG/HU
0%
420 — 485
40%
280 — 340
60%
210 — 270
100%
170 — 230
NOTE: The engine temperature must be above 160°F for this test to be valid.
NOTE: Engine must be idling in park at approximately 670 rpm.
With the scan tool, actuate the EGR Solenoid at 0%.
Select Data Display and read and note the MAF Per Cyl mg/hu reading.
NOTE: The EGR actuation will only occur for 30 seconds then actuation will stop automatically. Any read-
ings or measurements must be taken within 30 seconds of beginning of actuation.
Repeat the above steps actuating the EGR Valve at 0%, 40%, 60%, and 100% noting the MAF readings during
each actuation.
Refer to the chart and compare each of the EGR actuations and the expected MAF readings for each actuation.
Are the MAF Per Cyl mg/hu within the chart specifications for each percentage of EGR actuation?
Yes
>> EGR system operating correctly. Test Complete.
No
>> Go To 2
2.
CHECK FOR INTAKE AND EXHAUST SYSTEM RESTRICTIONS
Turn the ignition off.
Inspect the exhaust system for damaged components that could cause exhaust flow blockage.
Inspect all air intake, crankcase vent and turbocharger related hoses/tubes and connections for damage, air leaks or
blockage.
Inspect the air filter for excessive dirt, soiling or other problems that may cause restricted air flow.
Were any problems found?
Yes
>> Repair or replace as necessary.
Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)
No
>> Go to 3
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ENGINE ELECTRICAL DIAGNOSTICS - DIESEL
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3.
(A15) FUSED ASD RELAY OUTPUT CIRCUIT OPEN
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 (A15) Fused ASD Relay Output circuit at the EGR Sole-
noid harness connector.
Is the test light on?
Yes
>> Go To 4
No
>> Repair the (A15) Fused ASD Relay Output circuit for an open.
Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)
4.
(Z42) EGR SOLENOID GROUND CIRCUIT OPEN
Turn the ignition off.
Using a 12-volt test light connected to 12-volts, check the (Z42) EGR Solenoid Ground circuit at the EGR Solenoid
harness connector.
Is the test light on?
Yes
>> Replace the EGR Solenoid/Valve.
No
>> Repair the (Z42) EGR Solenoid Ground circuit for an open.
Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)
LX
ENGINE ELECTRICAL DIAGNOSTICS - DIESEL
9 - 1883
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