DTC P2243 |
Diagnostic Instructions |
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Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
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Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
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Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptors |
Diagnostic Fault Information |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
Heater Voltage Supply |
P0030 00 |
P0030 00 |
- |
P0131 5A, P0131 12 |
Heater Low Control |
P0031 00 |
P0030 00 |
P0032 00 |
- |
Reference Voltage (Signal) |
P0131 01 |
P0131 12, P2243 00 |
P0131 02 |
P0133 00, P0131 52, P0131 5A, P0132 52, P0132 5B |
Low Reference (Ground) |
P2A00 00 |
P0132 02, P2243 04 |
P0132 02 |
- |
Pump Current Signal |
P2626 00 |
P2626 00 |
P2626 00 |
- |
Trim Current Signal |
P2626 00 |
P2626 00 |
P2626 00 |
- |
Circuit/System Description |
Conditions for Running the DTC |
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DTCs P0030, P0031, P0032 are not set. |
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The ignition voltage is between 10-18 V. |
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The engine speed is more than 80 RPM. |
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The HO2S 1 heater is at operating temperature. |
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DTC P2243 runs continuously when the above conditions are met for 2 s. |
Conditions for Setting the DTC |
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The ECM detects an open on the reference voltage circuit. |
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DTC P2243 00 sets within 4 s when the above condition is met continuously, or within 50 s when the above condition is met cumulatively. |
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The ECM detects an open on the reference low circuit. |
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DTC P2243 04 sets within 4 s when the above condition is met continuously, or within 50 s when the above condition is met cumulatively. |
Action Taken When the DTC Sets |
Conditions for Clearing the DTC |
Reference Information |
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Circuit Testing
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Connector Repairs
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Testing for Intermittent Conditions and Poor Connections
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Wiring Repairs
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Circuit/System Verification |
1. |
Clear the DTCs with a scan tool. |
2. |
Operate the vehicle within the conditions to run and set the DTC. The DTC should not be set. |
3. |
Run the vehicle within the Conditions for Running the DTCs. You may also operate the vehicle within the conditions that you have noted from the Freeze Frame/Failure Records data. |
Circuit/System Testing |
Note | ||
You must perform the circuit/system verification before proceeding with circuit/system testing. |
1. |
Ignition OFF, disconnect the harness connector at the B52 Heated Oxygen Sensor. |
2. |
Ignition ON, test for 2.9 V between the B52 Heated Oxygen Sensor reference voltage circuit terminal 6 and ground |
3. |
If less than the specified value, test the circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module. |
4. |
If greater than the specified range, test the circuit for a short to voltage. If the circuit tests normal, replace the K20 Engine Control Module. |
5. |
Test for 2.5 V between the B52 Heated Oxygen Sensor low reference circuit terminal 2 and ground. |
6. |
If less than the specified value, test the circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module. |
7. |
If greater than the specified range, test the circuit for a short to voltage. If the circuit tests normal, replace the K20 Engine Control Module. |
8. |
Test for 2.8 V between the B52 Heated Oxygen Sensor control circuit terminal 1 and ground. |
9. |
If less than the specified value, test the circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module. |
10. |
If greater than the specified range, test the circuit for a short to voltage. If the circuit tests normal, replace the K20 Engine Control Module. |
11. |
Test for 2.8 V between the B52 Heated Oxygen Sensor control circuit terminal 5 and ground. |
12. |
If less than the specified value, test the circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module. |
13. |
If greater than the specified range, test the circuit for a short to voltage. If the circuit tests normal, replace the K20 Engine Control Module. |
14. |
Ignition OFF, disconnect the X1 harness connector at the K20 Engine Control Module. |
15. |
Test for infinite resistance between each B52 Heated Oxygen Sensor circuit terminals. |
16. |
If less than the specified value, repair as necessary. |
17. |
If all circuits test normal, replace the B52 Heated Oxygen Sensor and verify the DTC does not reset |
18. |
If the DTC resets, replace the K20 Engine Control Module. |
Repair Instructions |
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Heated Oxygen Sensor Replacement - Sensor 1
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Control Module References for ECM replacement, setup, and programming |