Volvo Workshop Manuals
XC90 AWD V8-4.4L VIN 85 B8444S (2005)
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 1767
The engine control module (ECM) can diagnose the knock sensors (KS).
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
The sensor is a negative temperature coefficient (NTC) type which is supplied with power from the control module (signal) and is grounded in the
Alternator control module (ACM)
See Design and Function, Generator (GEN).
Mass air flow (MAF) sensor/Intake air temperature (IAT) sensor
The mass air flow (MAF) sensor is a combined sensor and contains two sensors in the same component:
mass air flow (MAF) sensor
intake air temperature (IAT) sensor.
The mass air flow (MAF) sensor is positioned between the air cleaner (ACL) housing and the intake manifold.
Mass air flow (MAF) sensor
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