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Volvo Workshop Manuals | |
XC90 AWD L6-3.2L VIN 98 B6324S (2007)Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Description and Operation > System Overview > Page 1999![]() If the engine control module (ECM) registers knocking from any of the cylinders, the ignition will be retarded for that cylinder at the next combustion Engine coolant temperature (ECT) sensor The engine coolant temperature (ECT) sensor checks the temperature of the engine coolant. The temperature of the engine coolant is required so that the - the injection period - the idle speed - the engine cooling fan (FC) - the ignition advance - engagement and disengagement of the A/C compressor - diagnostic functions. The sensor is a negative temperature coefficient (NTC) type which is supplied with power from the control module (signal) and is grounded in the Mass air flow (MAF) sensor/Intake air temperature (IAT) sensor Overview The mass air flow (MAF) sensor is a combined sensor and contains two sensors in the same component: - Mass air flow (MAF) sensor Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Description and Operation > System Overview > Page 1999 | ||
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