Volvo Workshop Manuals
940 L4-2.3L SOHC VIN 88 B230F (1992)
Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Description and Operation > Fuel Injection > Page 4330
Knock causes high and dangerous combustion temperatures. The ignition system will first retard the timing in approx. 2.5° increments (to a
When the knock problem has been eliminated, the ignition ECU will advance the timing in 0.375° steps until the normal setting has been restored
STANDING CURRENT PROTECTION FUNCTION:
To avoid overheating the coil when the ignition is ON and the engine off, a separate circuit interrupts the current to the coil. The ECU uses the
If the self diagnostic circuit ("on board diagnostics") in the ECU detects a fault in the ignition system, it will activate the "CHECK ENGINE" light.
The ECU receives the following input signals:
^ Battery supply signal (voltage).
These signals are processed into the following outputs:
^ Power stage.
Ignition System And Components
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