DTC P0545 or P0546 |
Diagnostic Instructions |
• |
Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
• |
Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
• |
Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptors |
Circuit/System Description |
Exhaust Gas Temperature | Exhaust Gas Temperature Resistance | Exhaust Gas Temperature Signal Voltage |
Cold |
High |
High |
Warm |
Low |
Low |
Conditions for Running the DTC |
• |
The ignition is ON. |
• |
The DTCs run continuously when the above condition is met. |
Conditions for Setting the DTC |
Action Taken When the DTC Sets |
Conditions for Clearing the DTC |
Diagnostic Aids |
• |
After starting the engine, the exhaust gas temperature sensor temperature should rise steadily, then stabilize after the engine reaches operating temperature. |
• |
If the vehicle has set overnight, the exhaust gas temperature sensor and the intake air temperature (IAT) sensor values should display within 3°C (5°F). |
Reference Information |
• |
Circuit Testing
|
• |
Connector Repairs
|
• |
Testing for Intermittent Conditions and Poor Connections
|
• |
Wiring Repairs
|
Circuit/System Verification |
1. |
With the engine running, check the DTC Info with a scan tool. DTC P0545 or P0546 are not set. |
2. |
Operate the vehicle within the conditions for running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data. |
Circuit/System Testing |
1. |
Ignition OFF, disconnect the harness connector at the B131A Exhaust Temperature Sensor 1. |
2. |
Test for less than 5 Ω between the low reference circuit terminal 2 and ground. |
3. |
If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module. |
4. |
Disconnect the harness connector at both cooling fans. |
5. |
Ignition ON, verify the scan tool Exhaust Gas Temperature Sensor 1 parameter is at 5 V. |
6. |
If less than the specified range, test the signal circuit for a short to ground. If the circuit tests normal, replace the K20 Engine Control Module. |
7. |
Install a 1 A fused jumper wire between the signal circuit terminal 1 and ground. Verify the scan tool Exhaust Gas Temperature Sensor 1 parameter is at 0 V. |
8. |
If greater than the specified range, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module. |
9. |
If all circuits test normal, test or replace the B131A Exhaust Temperature Sensor 1. |
Repair Instructions |
• |
Exhaust Temperature Sensor Replacement - Position 1 (LBY/A20DTR) Exhaust Temperature Sensor Replacement - Position 1 (LBS/A20DTH)
|
• |
Control Module References for ECM replacement, setup, and programming |