Multiquip Portable Generator DCA400SSI4F3

Place the multimeter test leads across pins 1 and 2 on the ECU auto start module as shown in Figure 73.

Is the multimeter selection dial set to the sound position?

Is there continuity (beep!) between the pin 1 (BLACK/WHITE) and pin 2 (RED) wire leads on the ECU auto start module as referenced in Figure 73?

Does the multimeter read OPEN (no continuity or beep)?

If the multimeter reads OPEN (no continuity or beep), replace the MPU sensor.

Sign off on the Mpu Continuity Test

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.

6-pin plug disconnected from the CN1 receptacle on the AVR?

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

Resistance across the B-C open delta wire leads

6-pin plug unplugged 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.

NOTICE: Before performing the resistance test, the two black lead wires (Figure 36) must be disconnected from the rotating rectifier.

The main field (Figure 36) consists of two black lead wires with no wire designation. These two wire leads are connected to the DC positive and DC negative terminals on the rotating rectifier in conjunction with the surge protector.

Using a multimeter (Figure 36), check the resistance across each black wire as referenced in Table 6, column B. Be sure to place the selection dial on the multimeter to the Ω position.

If the reading indicates an open circuit the component may have to be replaced or repaired.

Upload a photo of the multimeter reading

Sign off on the resistance test

Warning: This adjustment requires trained personnel!

Turn the engine fault delay adjustment potentiometer 30 turns counterclockwise

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

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.

Sign off on the fault delay adjustment

NOTICE: Be sure you have adjusted the engine crank disconnect potentiometer first.

Turn the engine overspeed adjustment potentiometer (Figure 56C) 30 turns clockwise

Set the DIP switch at position 5 (Figure 56D) to the ON position (up)

Start the engine. It should crank and start. Verify that the engine running LED is lit.

Start turning the overspeed adjustment potentiometer counterclockwise until the engine control shuts down the engine (overspeed fault)

Set the DIP switch at position 5 to the OFF position (down)

If the overcrank and overspeed LEDs light at the same time on the ECU, reference troubleshooting flow charts in this service manual for additional information.

Sign off on the engine overspeed adjustment