Chrysler 300/300 Touring/300C, Dodge Magnum. Manual — part 1460
8.
(T752) STARTER RELAY CONTROL CIRCUIT SHORTED TO VOLTAGE
Turn the ignition off.
Disconnect the ECM harness connectors.
Remove the ASD Relay from the IPM.
Using a jumper wire, connect ASD Relay connector cavities 30 and 87
in the IPM.
Turn the ignition on.
Measure the voltage of the (T752) Starter Relay Control circuit.
Is the voltage above 1.0 volt?
Yes
>> Repair the (T752) Starter Relay Control circuit for a short to
voltage.
Perform the ECM Verification Test Ver. 1. (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING)
No
>> Go To 9
9.
(T752) STARTER RELAY CONTROL CIRCUIT OPEN
Turn the ignition off.
Measure the resistance of the (T752) Starter Relay Control circuit
between the ECM harness connector and the Starter Relay connector in
the IPM.
Is the resistance below 10.0 ohms?
Yes
>> Replace the Engine Control Module in accordance with the
Service Information.
Perform the ECM Verification Test Ver. 1. (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING)
No
>> Repair the (T752) Starter Relay Control circuit for an open.
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10.
FUSED B(+) CIRCUIT OPEN
Using a 12-volt test light connected to ground, check the Fused B(+)cir-
cuit in the Starter Relay connector in the IPM.
Is the test light on?
Yes
>> Go To 11
No
>> Repair the Fused B(+) circuit for an open.
Perform the ECM Verification Test Ver. 1. (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING)
11.
(T750) STARTER RELAY OUTPUT CIRCUIT OPEN
Disconnect the (T750) Starter Relay Output wire from the Starter Sole-
noid.
Connect the (T750) Starter Relay Output wire (at the Starter) to ground.
Using a 12-volt test light connected to 12-volts, check the (T750) Starter
Relay Output circuit at the Starter Relay connector in the IPM.
Does the test light illuminate brightly?
Yes
>> Go To 12
No
>> Repair the (T750) Starter Relay Output circuit for an open.
Perform the ECM Verification Test Ver. 1. (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING)
12.
MECHANICAL PROBLEM
Turn the ignition off.
Attempt to manually rotate the crankshaft 360°.
Is the crankshaft able to rotate 360°?
Yes
>> Replace the Starter Motor.
Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)
No
>> Repair the engine mechanical problem.
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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*LACK OF ENGINE POWER
For a complete wiring diagram Refer to Section 8W
Possible Causes
AIR IN FUEL SYSTEM
FUEL INJECTOR CLASSIFICATION
INTAKE/EXHAUST SYSTEM RESTRICTION
EGR SYSTEM PROBLEM
LOW ENGINE COMPRESSION
INTAKE AIR SYSTEM LEAK
FUEL DELIVERY SYSTEM RESTRICTION
ENGINE DRIVE BELT/CHAIN
FUEL INJECTOR(S)
FUEL PRESSURE SOLENOID
FUEL INJECTION PUMP
FUEL SYSTEM CONTAMINATION
FUEL SYSTEM LEAK
TURBOCHARGER
Diagnostic Test
1.
CHECKING FOR ECM DTCS
WARNING: HIGH-PRESSURE FUEL LINES DELIVER DIESEL FUEL UNDER EXTREME PRESSURE FROM THE
INJECTION PUMP TO THE FUEL INJECTORS. THIS MAY BE AS HIGH AS 23,200 PSI (1600 BAR). USE
EXTREME CAUTION WHEN INSPECTING FOR HIGH-PRESSURE FUEL LEAKS.
WARNING: FUEL UNDER THIS AMOUNT OF PRESSURE CAN PENETRATE SKIN CAUSING PERSONAL
INJURY OR DEATH. INSPECT FOR HIGH-PRESSURE FUEL LEAKS WITH A SHEET OF CARDBOARD. WEAR
SAFETY GOGGLES AND ADEQUATE PROTECTIVE CLOTHING WHEN SERVICING FUEL SYSTEM.
Turn the ignition on.
With the scan tool, read the ECM DTCs.
Are there any DTCs present?
Yes
>> Refer to symptom list for problems related to this DTC.
Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)
No
>> Go To 2
2.
FUEL SYSTEM LEAK
Turn the ignition off.
WARNING: HIGH-PRESSURE FUEL LINES DELIVER DIESEL FUEL UNDER EXTREME PRESSURE FROM THE
INJECTION PUMP TO THE FUEL INJECTORS. THIS MAY BE AS HIGH AS 23,200 PSI (1600 BAR). USE
EXTREME CAUTION WHEN INSPECTING FOR HIGH-PRESSURE FUEL LEAKS.
WARNING: FUEL UNDER THIS AMOUNT OF PRESSURE CAN PENETRATE SKIN CAUSING PERSONAL
INJURY OR DEATH. INSPECT FOR HIGH-PRESSURE FUEL LEAKS WITH A SHEET OF CARDBOARD. WEAR
SAFETY GOGGLES AND ADEQUATE PROTECTIVE CLOTHING WHEN SERVICING FUEL SYSTEM.
Inspect the entire fuel system for leakage.
Is there any evidence of leakage?
Yes
>> Repair as necessary in accordance with the Service Information.
Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)
No
>> Go To 3
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3.
FUEL SYSTEM CONTAMINATION
NOTE: Mixing any other fuels such as gasoline or kerosine can cause this symptom to occur.
Turn the ignition off.
WARNING: HIGH-PRESSURE FUEL LINES DELIVER DIESEL FUEL UNDER EXTREME PRESSURE FROM THE
INJECTION PUMP TO THE FUEL INJECTORS. THIS MAY BE AS HIGH AS 23,200 PSI (1600 BAR). USE
EXTREME CAUTION WHEN INSPECTING FOR HIGH-PRESSURE FUEL LEAKS.
WARNING: FUEL UNDER THIS AMOUNT OF PRESSURE CAN PENETRATE SKIN CAUSING PERSONAL
INJURY OR DEATH. INSPECT FOR HIGH-PRESSURE FUEL LEAKS WITH A SHEET OF CARDBOARD. WEAR
SAFETY GOGGLES AND ADEQUATE PROTECTIVE CLOTHING WHEN SERVICING FUEL SYSTEM.
Inspect the fuel system for contamination.
Is the fuel contaminated?
Yes
>> Repair as necessary in accordance with the Service Information.
Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)
No
>> Go To 4
4.
CHECKING BOOST PRESSURE
Turn the ignition on.
NOTE: This test requires two people. One person to test drive the vehicle while a technician observes the
scan tool readings.
With the scan tool in Sensors, read and compare the Boost Pressure (PSI) with the Boost Pressure Desired/Set-
point (PSI) while test driving the vehicle under various load conditions such as idle, hard acceleration, and cruise.
NOTE: The Boost Pressure reading should directionally follow (trail) the Boost Pressure Desired/Setpoint
reading.
Does the Boost Pressure reading follow the Boost Pressure Desired/Setpoint reading?
Yes
>> Go To 5
No
>> Go To 13
5.
CHECKING FUEL PRESSURE
Turn the ignition on.
NOTE: This test requires two people. One person to test drive the vehicle while a technician observes the
scan tool readings.
With the scan tool in Sensors, read and compare the Fuel Pressure (PSI) with the Fuel Pressure Desired/Setpoint
(PSI) while test driving the vehicle under various load conditions such as idle, hard acceleration, cruise and decel-
eration.
NOTE: The Fuel Pressure reading should directionally follow (trail) the Fuel Pressure Desired/Setpoint read-
ing.
Does the Fuel Pressure reading directionally follow the Fuel Pressure Desired/Setpoint reading?
Yes
>> Go To 6
No
>> Go To 10
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