P0545

P0545-EXHAUST GAS TEMPERATURE SENSOR CIRCUIT LOW - BANK 1 SENSOR 1





For a complete wiring diagram Consult Diagrams/Electrical

- When Monitored:
With the ignition on.

- Set Condition:
The ECM detects that the (K352) Pre-Catalyst Exhaust Temperature Sensor Signal circuit is shorted to ground.





Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.Initial Inspection and Diagnostic Overview

Diagnostic Test

1. DTC IS ACTIVE
Ignition on, engine not running.
With the scan tool, Clear DTCs in the Engine Control Module (ECM).
Monitor the scan tool for at least two minutes.
Cycle the ignition key off and on several times, leaving the ignition on for at least 10 seconds at a time.
Start the engine.
Allow the engine to reach normal operating temperature.
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.Intermittent Condition

2. (K352) PRE-CATALYST EXHAUST TEMPERATURE SENSOR SIGNAL CIRCUIT SHORTED TO GROUND




Turn the ignition off.
Disconnect the Pre-Catalyst Exhaust Temperature Sensor harness connector.
Disconnect the Engine Control Module (ECM) harness connector.
Measure the resistance between ground and the (K352) Pre-Catalyst Exhaust Temperature Sensor Signal circuit in the Pre-Catalyst Exhaust Temperature Sensor harness connector.
Is the resistance above 1000 ohms?

Yes

- Go to 3

No

- Repair the (K352) Pre-Catalyst Exhaust Temperature Sensor Signal circuit for a short to ground.
- Perform the ECM Verification Test Ver. 1. Verification Tests

3. (K352) PRE-CATALYST EXHAUST TEMPERATURE SENSOR SIGNAL CIRCUIT SHORTED TO (K916) PRE-CATALYST EXHAUST TEMPERATURE SENSOR GROUND CIRCUIT




Measure the resistance between the (K352) Pre-Catalyst Exhaust Temperature Sensor Signal circuit and the (K916) Pre-Catalyst Exhaust Temperature Sensor Ground circuit in the Pre-Catalyst Exhaust Temperature Sensor harness connector.
Is the resistance above 1000 ohms?

Yes

- Go to 4

No

- Repair the (K352) Pre-Catalyst Exhaust Temperature Sensor Signal circuit for a short to the (K916) Pre-Catalyst Exhaust Temperature Sensor Ground circuit.
- Perform the ECM Verification Test Ver. 1. Verification Tests

4. (K352) PRE-CATALYST EXHAUST TEMPERATURE SENSOR SIGNAL CIRCUIT OPEN CIRCUIT OR HIGH RESISTANCE




Measure the resistance of the (K352) Pre-Catalyst Exhaust Temperature Sensor Signal circuit between the Pre-Catalyst Exhaust Temperature Sensor harness connector and the Engine Control Module (ECM) harness connector.
Is the resistance below 10.0 ohms?

Yes

- Go to 5

No

- Repair the (K352) Pre-Catalyst Exhaust Temperature Sensor Signal circuit for an open circuit or high resistance.
- Perform the ECM Verification Test Ver. 1. Verification Tests

5. PRE-CATALYST EXHAUST TEMPERATURE SENSOR
Connect the Engine Control Module (ECM) connector.
Turn the ignition on.
With the scan tool, clear DTCs.
With the scan tool, select View DTCs.
Monitor the scan tool for at least two minutes.

NOTE: The scan tool should display a Pre-Catalyst Exhaust Temperature Sensor high voltage or open circuit DTC with the Pre-Catalyst Exhaust Temperature Sensor connector disconnected.

Does the scan tool display the DTC as described above?

Yes

- Replace the Pre-Catalyst Exhaust Temperature Sensor.
- Perform the ECM Verification Test Ver. 1. Verification Tests

No

- Go to 6

6. ENGINE CONTROL MODULE (ECM)
Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Pre-Catalyst Exhaust Temperature 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.
Search for any Technical Service Bulletins that may apply.
Were any problems found?

Yes

- Repair as necessary.
- Perform the ECM Verification Test Ver. 1. Verification Tests

No

- Replace the Engine Control Module (ECM).
- Perform the ECM Verification Test Ver. 1. Verification Tests