Chrysler 300/300 Touring/300C, Dodge Magnum. Manual — part 1291
8.
ENGINE CONTROL MODULE (ECM)
Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Oxygen Sensor and
the Engine Control Module (ECM).
Look for any chafed, pierced, pinched, or partially broken wires.
Look for broken, bent, pushed out or corroded terminals.
Monitor the scan tool data relative to this circuit and wiggle test the wiring and connectors.
Look for the data to change or for the DTC to reset during the wiggle test.
Refer to any Technical Service Bulletins that may apply.
Were any problems found?
Yes
>> Repair as necessary.
Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)
No
>> Replace the Engine Control Module (ECM) in accordance with the Service Information.
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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P0135-O2 SENSOR 1/1 HEATER PERFORMANCE
For a complete wiring diagram Refer to Section 8W
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ENGINE ELECTRICAL DIAGNOSTICS - DIESEL
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•
When Monitored:
With the ignition on and the Oxygen Sensor Heater command on.
•
Set Condition:
The ECM detects an implausible voltage on the (K99) O2 1/1 Heater Control circuit for 2.0 seconds.
Possible Causes
INTERMITTENT DTC
(K99) O2 1/1 HEATER CONTROL CIRCUIT SHORTED TO VOLTAGE
(K99) O2 1/1 HEATER CONTROL CIRCUIT SHORTED TO GROUND
(K99) O2 1/1 HEATER CONTROL CIRCUIT OPEN OR HIGH RESISTANCE
(K343) FUSED ASD RELAY OUTPUT 2 CIRCUIT OPEN OR HIGH RESISTANCE
OXYGEN SENSOR
ENGINE CONTROL MODULE (ECM)
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING)
Diagnostic Test
1.
DTC IS ACTIVE
Ignition on, engine not running.
With the scan tool, Clear DTCs in the Engine Control Module (ECM).
With the scan tool, actuate the Oxygen Sensor Heater.
Monitor the scan tool for at least two minutes.
With the scan tool, select View DTCs.
Is the status Active for this DTC?
Yes
>> Go To 2
No
>> Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING)
2.
(K99) O2 1/1 HEATER CONTROL CIRCUIT SHORTED TO VOLTAGE
Turn the ignition off.
Disconnect the Oxygen Sensor connector.
Disconnect the Engine Control Module (ECM) connector.
Remove the ASD Relay from the IPM.
Connect a jumper wire between cavity 30 and cavity 87 of the ASD
Relay Connector.
Turn the ignition on.
Measure the voltage of the (K99) O2 1/1 Heater Control circuit in the
Oxygen Sensor connector.
Is there any voltage present?
Yes
>> Repair the (K99) O2 1/1 Heater Control circuit for a short to
voltage.
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.
(K99) O2 1/1 HEATER CONTROL CIRCUIT SHORTED TO GROUND
Turn the ignition off.
Measure the resistance between ground and the (K99) O2 1/1 Heater
Control circuit in the Oxygen Sensor connector.
Is the resistance above 10.0 ohms?
Yes
>> Go to 4
No
>> Repair the (K99) O2 1/1 Heater Control circuit for a short to
ground.
Perform the ECM Verification Test Ver. 1. (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING)
4.
(K99) O2 1/1 HEATER CONTROL CIRCUIT OPEN OR HIGH RESISTANCE
Measure the resistance of the (K99) O2 1/1 Heater Control circuit
between the Oxygen Sensor connector and the Engine Control Module
(ECM) connector.
Is the resistance below 10.0 ohms?
Yes
>> Go to 5
No
>> Repair the (K99) O2 1/1 Heater Control circuit for an open
circuit or high resistance.
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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