Diagnostic trouble code (DTC) information

WARNING: This page is about a different car, the 2004 Volvo S40, 2003 Volvo S40, 2002 Volvo S40, 2001 Volvo S40, and 2000 Volvo S40. However, it is still accessible from the selected car via links, so may be relevant.

Condition

Fig 1: Identifying Injector Terminals

Courtesy of VOLVO CARS OF NORTH AMERICA.

Diagnostic trouble code (DTC) ECM-15 is stored if the engine coolant temperature (ECT) sensor circuit is short-circuited to ground or voltage or if there is an open-circuit in the circuit.

Substitute Value

The engine coolant temperature (ECT) is calculated theoretically after start
Initial boost pressure
The A/C is switched off
No heated oxygen sensor (HO2S) diagnostics
No idle air trim adaptation
No leak diagnostic.

Possible Source

Signal too high:

Short-circuit to supply voltage in the signal cable
Open-circuit in the signal cable or ground lead
Faulty engine coolant temperature (ECT) sensor
Contact resistance and oxidation.

Signal too low:

Short-circuit to ground in signal cable
Faulty engine coolant temperature (ECT) sensor.

Fault symptom[s]

Difficult to start
The engine cooling fan (FC) operates constantly
Low idling speed
High idling speed
Malfunction indicator lamp (MIL) lit.