Exhaust Flap Valve 1, Checking

Exhaust Flap Valve 1, Checking

The Exhaust Flap Valve 1 (N321) is controlled by the Engine Control Module (ECM) (J623).

Special tools, testers and auxiliary items required

• Multimeter.

• Wiring diagram.

Test requirements

• The Engine Component Power Supply Relay (J757) OK.

• The Fuse (SC3) OK.

• The parking brake engaged.

• The battery voltage at least 12.5 V.

• The selector lever of automatic transmission in position "P" or " N".

• All electrical consumers switched off (radiator fan must NOT run during test).

• A/C switched off.

• The ignition switched off.

Test Procedure

- Perform a preliminary check to verify the customers complaint. Refer to => [ Preliminary Check ] Preliminary Check

- Disconnect the Exhaust Flap Valve 1 (N321) electrical harness connector - arrow -.





Checking internal resistance

- Using a Multimeter , check the Exhaust Flap Valve 1 (N321) terminals 1 to 2 for resistance





Specified value: 22.0 to 30.0 ohms.

If the specified value was not obtained:

- Replace the Exhaust Flap Valve 1 (N321). Refer to appropriate repair information.

If the specified value was obtained:

Checking voltage

Crank the engine.

- Using a Multimeter, check the Exhaust Flap Valve 1 (N321) electrical harness connector terminal 1 to Ground (GND) for voltage.





Specified value: battery voltage.

- Switch the ignition off.

If the specified value was not obtained:

- Check the wiring from the Exhaust Flap Valve 1 (N321) electrical harness connector terminal 1 to the Engine Component Power Supply Relay (J757) socket 8/87 for a short circuit to Ground (GND), or an open circuit.

- Check the electrical harness connector for damage, corrosion, lose or broken terminals.

- If necessary, repair the wiring connection.

If no malfunctions are found in the wiring:

Checking wiring connections

If the manufacturers test box is being used, perform the following step.

- Install the test box. Refer to appropriate repair information.

If the manufacturers test box is not being used, perform the following step.

- Remove the Engine Control Module (ECM) (J623). Refer to appropriate repair information

- Using a multimeter, check the Exhaust Flap Valve 1 (N321) electrical harness connector terminal 2 to the Engine Control Module (ECM) (J623) electrical harness connector T94 terminal 28 for an open circuit.









Specified value: 1.5 ohms Max.

If the specification was not obtained:

- Check the wiring for a short circuit to each other, Battery (+), and Ground (GND), or an open circuit.

- If necessary, repair the faulty wiring connection.

If no malfunction is detected in the wiring:

- Replace the Engine Control Module (ECM) (J623). Refer to appropriate repair information.

- Assembly is performed in the reverse order of removal.

Final procedures

After the repair work, the following work steps must be performed in the following sequence:

1. Check the DTC memory. Refer to => [ Diagnostic Mode 03 - Read DTC Memory ] Diagnostic Modes 01 - 0A.

2. If necessary, erase the DTC memory. Refer to => [ Diagnostic Mode 04 - Erase DTC Memory ] Diagnostic Modes 01 - 0A.

3. If the DTC memory was erased, generate readiness code. Refer to => [ Readiness Code ] Monitors, Trips, Drive Cycles and Readiness Codes.