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"Also, with code 1-3-1 which is "RPM sensor to EZK missing", it doesn't match the given symptoms which is the engine not starting."
• 1-3-1 does match the no-start symptoms perfectly. When the EZK fails to get RPM sensor pulses, the engine will not start. Or, if it does get started, it may quit or mis-fire intermittently due to engine vibration or torque reaction when accelerating.
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Start-Run Sequence LH 2.4
1) During starter cranking, the Crank Position Sensor (CPS) sends timing pulses to the Ignition Control Unit (ICU).
2-a) The ICU sends these CPS pulses to the Power Stage (aka Ignition Amplifier), to initiate spark voltage pulses from the coil.
2-b) At the same time, the ICU also propagates these CPS-based pulses to the Fuel ECU to allow FI operation (no ICU pulses means no FI operation).
3-a) The Fuel Injection "System"* relay (previously energized at Key On) sends 12V power to the:
• Fuel Injection ECU,
• Fuel (pump) relay coil + side (ECU controls coil ground)
• Idle Air Control valve (IAC) (ECU controls coil ground)
* The System relay is in the white case with the Fuel pump relay.
3-b) When FI ECU receives (CPS based) ICU pulses, it "energizes" the Fuel pump relay by grounding the relay coil (– side).
At this point, the engine runs until the Ignition is switched off, which in turn shuts down the FI system.
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Bruce Young, '93 940-NA (current), 240s (one V8), 140s, 122s, since '63.
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