Multiquip Portable Generator DCA25SSIU4F

Loosen the jam nut that secures the MPU to the sensor plate

Visually view the flywheel teeth through the hole opening on the sensor plate

Attach a ratchet to the crankshaft pulley and rotate the flywheel gear until the highest point of the flywheel gear tooth is visible

Reinstall the MPU sensor back into the sensor plate. Continue screwing the MPU sensor clockwise until contact is made with the flywheel gear tooth

After making contact with the flywheel gear tooth, unscrew the MPU sensor counterclockwise 1/2 turn

Verify that the MPU sensor does not make contact with the flywheel by rotating the flywheel gear completely around. Flywheel should rotate freely

The MPU sensor-flywheel gear gap should be adjusted so that the minimum voltage required is attained while the engine is in crank status. The voltage setting we are looking to obtain is 2.25 VAC +/- 0.50 VAC

Once the correct gap is obtained, tighten the MPU sensor jam nut to secure it to the sensor plate

Warning: This procedure requires trained personnel with PPE!

If fuel pump relay did not test normal, report the issue to the maintenance team and stop the procedure

Upload a photo of the relay base holder before cleaning

Dielectric cleaner sprayed onto the contact pins on the relay base holder?

Enter the air pressure used for blowing off dirt and debris

Dirt and debris removed from the relay base holder contact pins?

Upload a photo of the relay base holder after cleaning

Fuel pump relay reinstalled back into its base holder?

NOTICE: Before performing the resistance check, the CN14 connector plug (Figure 53) must be disconnected from the CN4 receptacle on the AVR. If the reading indicates an open circuit or incorrect reading replace the rheostat.

Symptom: AC voltage output is half the normal value and there is no response when adjusting rheostat.

Disconnect the CN14 plug from the CN4 receptacle on the AVR and measure the resistance of the rheostat at the connector plug.

Set the multimeter selection dial to to the W position as shown in Figure 53A.

Place the multimeter leads between pins 1 and 3 on the CN14 connector plug (Figure 53B). Turn the voltage control knob (Figure 53C) fully counterclockwise. The multimeter should read zero ohms (Figure 53D).

Next, turn the knob slowly until the knob is fully clockwise and the multimeter should read about 1000 ohms (Figure 53E).

Warning: Only trained personnel should perform this adjustment

Turn the engine fault delay adjustment potentiometer (Figure 56E) 30 turns counterclockwise.

Potentiometer turned 30 turns counterclockwise?

This will allow for about 1 second of fault delay. Fault delay is begun after the engine has started.

Engine started and running in fault mode for about 1 second?

The purpose of the delay is to allow time for oil pressure to build adequately, before the oil pressure monitor starts checking the oil pressure sender.

High water temperature is also ignored during the fault delay time to allow engine coolant to circulate in the engine.

NOTICE: Before performing the resistance check, the 6-pin plug (Figure 51B) must be disconnected from the CN1 receptacle on the AVR. If the reading indicates an open circuit the component may have to be replaced or repaired.

Set the multimeter selection dial to the W position as shown in Figure 51A.

Resistance across the A-B, C-D, D-A open delta wire leads as referenced in Figure 51B.

Resistance across the B-C open delta wire leads as referenced in Figure 51B.

Again, be sure to unplug the 6-pin plug from the CN1 receptacle on the AVR.

As shown in Figure 52 there are three outside connectors that plug into the CN1, CN3 and CN4 receptacles on the AVR.

The CN2 receptacle has no outside plug connected to it. Pins 1 and 2 are internally jumpered together and pins 3 and 4 are also jumpered together.

As shown in Figure 52 there are two WHITE wires that connect to the AVR 2-pin terminal block via relay unit RY1.

The AVR also has three potentiometers only one is used for coarse adjustment of the voltage, the other two are factory set and should NOT be adjusted. In addition there is an 8-amp circuit protection fuse.