P257F-ENGINE HOOD SWITCH CIRCUIT HIGH

For a complete wiring diagram, refer to the Wiring Information.

When Monitored:
With the ignition on.
Set Condition:
The Powertrain Control Module (PCM) detects that the (K806) Engine Hood Switch 2 Signal circuit is open.

Possible Causes
(K806) ENGINE HOOD SWITCH 2 SIGNAL CIRCUIT OPEN/HIGH RESISTANCE
ENGINE HOOD SWITCH
POWERTRAIN CONTROL MODULE (PCM)

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).

1. DTC IS ACTIVE

1.	Ignition on, engine not running.

2.	With the scan tool, clear DTCs in the PCM.

3.	Start the engine.

4.	Allow the engine to reach normal operating temperature.

5.	Monitor the scan tool for at least two minutes.

6.	With the scan tool, select View DTCs.

Is the status Active for this DTC?

Yes

Go To 2

Perform the INTERMITTENT DTC diagnostic procedure. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).

2. CHECK THE (K806) ENGINE HOOD SWITCH 2 SIGNAL CIRCUIT FOR AN OPEN/HIGH RESISTANCE

1.	Turn the ignition off.

2.	Disconnect the Engine Hood Switch 2 harness connector.

3.	Disconnect the PCM C1 harness connector.

4.	Measure the resistance of the (K806) Engine Hood Switch 2 Signal circuit between the Engine Hood Switch 2 harness connector and the PCM C1 harness connector.

Is the resistance below 5.0 Ohms?

Yes

Go To 3

Repair the (K806) Engine Hood Switch 2 Signal circuit for an open or high resistance.
Perform the PCM VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).

3. CHECK THE HOOD SWITCH

1.	Turn the ignition off.

2.	Open the Hood.

3.	Using an Ohmmeter connected to ground, probe the Engine Hood Switch 2 terminal.

NOTE: Observe the reading on the Ohmmeter.

4.	Press and hold the Engine Hood Switch down completely.

NOTE: Observe the reading on the Ohmmeter.

NOTE: The Engine Hood Switch should read below 5.0 Ohms with the Hood Switch released and change to OL with the Hood Switch pressed.

Does the Ohmmeter read as described above?

Yes

Go To 4

Replace the Engine Hood Switch in accordance with the service information.
Perform the PCM VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).

4. POWERTRAIN CONTROL MODULE

1.	Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Engine Hood Switch 2 and the Powertrain Control Module.

2.	Look for any chafed, pierced, pinched, or partially broken wires.

3.	Look for broken, bent, pushed out or corroded terminals.

4.	Perform any Technical Service Bulletins that may apply.

Were any problems found?

Yes

Repair as necessary.
Perform the PCM VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).

Replace the Powertrain Control Module in accordance with the service information.
Perform the PCM VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).

P257F-ENGINE HOOD SWITCH CIRCUIT HIGH

Possible Causes