Chrysler 300/300 Touring/300C, Dodge Magnum. Manual — part 1445
P2627-O2 SENSOR 1/1 PUMP CELL CURRENT TRIM CIRCUIT LOW
For a complete wiring diagram Refer to Section 8W
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•
When Monitored:
With the ignition on.
•
Set Condition:
The ECM detects a short to ground on the (K902) O2 1/1 Pump Cell Current Trim circuit for 2.0 seconds.
Possible Causes
INTERMITTENT DTC
(K902) O2 1/1 PUMP CELL CURRENT TRIM CIRCUIT SHORTED TO GROUND
(K902) O2 1/1 PUMP CELL CURRENT TRIM CIRCUIT SHORTED TO THE (K99) O2 1/1 HEATER CONTROL
CIRCUIT
(K902) O2 1/1 PUMP CELL CURRENT TRIM 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).
Start the engine.
Allow the engine to reach normal operating temperature.
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.
(K902) O2 1/1 PUMP CELL CURRENT TRIM CIRCUIT SHORTED TO GROUND
Turn the ignition off.
Disconnect the Oxygen Sensor connector.
Disconnect the Engine Control Module (ECM) connector.
Measure the resistance between ground and the (K902) O2 1/1 Pump
Cell Current Trim circuit in the Oxygen Sensor connector.
Is the resistance above 1000.0 ohms?
Yes
>> Go to 3
No
>> Repair the (K902) O2 1/1 Pump Cell Current Trim circuit for
a short to ground.
Perform the ECM Verification Test Ver. 1. (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING)
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3.
(K902) O2 1/1 PUMP CELL CURRENT TRIM CIRCUIT SHORTED TO THE (K99) O2 1/1 HEATER CONTROL
CIRCUIT
Measure the resistance between the (K902) O2 1/1 Pump Cell Current
Trim circuit and the (K99) O2 1/1 Heater Control circuit in the Oxygen
Sensor connector.
Is the resistance above 1000.0 ohms?
Yes
>> Go to 4
No
>> Repair the (K902) O2 1/1 Pump Cell Current Trim circuit for
a short to the (K99) O2 1/1 Heater Control circuit.
Perform the ECM Verification Test Ver. 1. (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING)
4.
(K902) O2 1/1 PUMP CELL CURRENT TRIM CIRCUIT OPEN OR HIGH RESISTANCE
Measure the resistance of the (K902) O2 1/1 Pump Cell Current Trim
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 (K902) O2 1/1 Pump Cell Current Trim 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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5.
OXYGEN SENSOR
Turn the ignition off.
Connect the Engine Control Module (ECM) connector.
Replace the Oxygen Sensor in accordance with the Service Information.
Start the engine.
Allow the engine to reach normal operating temperature.
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 6
No
>> Test Complete.
Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)
6.
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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