Ignition trumps fuel, so you need to start there, although Fuel system-related problems are more common. The exact sequence of events for starting and running is detailed below. The trick is to determine which step is failing. The 700/900 FAQ has much info on diagnosing and testing the same EZK Ignition and LH 2.4 FI as used with your B230.

Start Sequence

1) During starter cranking, the Crank Position Sensor (aka RPM Sender, etc.) sends timing pulses to the EZK Ignition Control Unit (ICU)

2-a) The ICU uses these timing pulses to trigger the Power Stage (aka Ignition Amplifier), which initiates spark from the coil.

2-b) At the same time, the ICU also propagates these timing pulses to the LH Fuel ECU, to allow FI operation (no ICU pulses means no FI operation).

3-a) The Fuel "System" relay lives in the white case with the Fuel relay. It gets energized at Key On to power the AMM, IAC, ECU, Injectors, and Fuel (pump) relay coil + side.

3-b) When the FI ECU senses the ICU pulses timing pulses, it "energizes" the Fuel relay by grounding the Fuel relay coil to run the fuel pumps.

When all these things work, the engine runs until the Ignition is switched off, which in turn shuts down the FI system.

Determining whether or not there is spark at the plugs (2a) —and whether or not the plugs are getting gas (3)— will allow some analysis of this sequence.

For example, if 2a fails due to a bad Power Stage/Amplifier, there will be a no-start with gas-wet plugs. If 2b fails (practically never) symptoms will be Fuel-related: a no-start with spark at the plugs, but plugs remain dry.

• For testing, jumpering the LEFT side contacts of fuses 4 and 6 will bypass both the 25A blade fuse (or fuse #6 on '91-'93) and the Fuel relay—and should power up both pumps immediately.
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Bruce Young, '93 940-NA (current), 240s (one V8), 140s, 122s, since '63.