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 4331
The Rex I ignition is based on the fully electronically controlled Bendix ignition system with knock control. The ECU, located above the steering
The programs which enable the ECU to function are discussed below.
Three-Dimensional Ignition Map
The control unit is programmed with a series of specific settings for a number of defined speeds and engine loads. These settings are stored in the
Knock causes high and dangerous combustion temperatures. The ignition system will first retard the timing in approx. 3° increments (to a
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.
Input devices (the ECU receives):
^ Battery supply signal (voltage).
Output devices (The ECU controls):
^ Power stage.
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