Volvo

The function identifies the exhaust temperature and indicates malfunction in the exhaust system. The evaluation is done at engine load after an engine cold start via three different temperature sensors. The exhaust gas temperature is used to determine when regeneration will run.

Conditions for diagnostic trouble code (DTC):
1) Open circuit
2) Short circuit to battery voltage
3) Replace with phrase describing observable symptom or hide

Probable cause
1) Exhaust Gas Temperature (EGT) Sensor
2) Wiring harness
3) Connector
4) Dosage electronic control unit (ECU) (ACM)

The Engine Control Module (ECM) monitors the voltage drop across the sensor and uses this signal to warn the driver and derate the engine to avoid engine damage if the signal is not within programmed limits.

Conditions for diagnostic trouble code (DTC):
1) The voltage at pin A14.EB:32 is above normal value

Observable symptoms
1) None

Probable cause
1) Engine control module (ECM)
2) Short circuit to 5V, Signal wire
3) Short circuit to voltage supply, signal wire

The Engine Control Module (ECM) monitors the voltage drop across the sensor and uses this signal to warn the driver and derate the engine to avoid engine damage if the signal is not within programmed limits.

Conditions for diagnostic trouble code (DTC):
1) The voltage at pin A14.EB:32 is below normal value

Observable symptoms
1) None

Probable cause
1) Temperature Sensor
2) Short circuit to ground, Signal wire
3) Engine control module (ECM)

The Engine Oil Level/Temperature Sensor contains two thermistors, one for engine oil temperature and one for engine oil level. The resistance of the engine oil temperature portion of the sensor changes inversely to the temperature of the engine oil. When the engine oil is cold, the sensor resistance is high. As the temperature of the engine oil increases, the sensor resistance decreases.
The Engine Control Module (ECM) monitors the voltage drop across the sensor and uses this signal to warn the driver and derate the engine to avoid engine damage if the signal is not within programmed limits.

Conditions for diagnostic trouble code (DTC):
1) Temperature too high

Observable symptoms
1) Info lamp lights up if the temperature is moderately above range
2) Red lamp lights up if the temperature is critically above range
3) A buzzer sounds if the temperature is critically above range
4) Engine de-rated

Probable cause
1) Extreme driving conditions
2) Engine cooling fan
3) Oil thermostat
4) Cooling System
5) Clogged oil cooler
6) Engine oil level (EOL) and temperature sensor

The Engine Oil Level/Temperature Sensor contains two thermistors, one for engine oil temperature and one for engine oil level. The resistance of the engine oil temperature portion of the sensor changes inversely to the temperature of the engine oil. When the engine oil is cold, the sensor resistance is high. As the temperature of the engine oil increases, the sensor resistance decreases.
The Engine Control Module (ECM) monitors the voltage drop across the sensor and uses this signal to warn the driver and derate the engine to avoid engine damage if the signal is not within programmed limits.

Conditions for diagnostic trouble code (DTC):
1) Temperature too high

Observable symptoms
1) Info lamp lights up if the temperature is moderately above range
2) Red lamp lights up if the temperature is critically above range
3) A buzzer sounds if the temperature is critically above range
4) Engine de-rated

Probable cause
1) Extreme driving conditions
2) Engine cooling fan
3) Oil thermostat
4) Cooling System
5) Clogged oil cooler
6) Engine oil level (EOL) and temperature sensor

The Engine Oil Temperature/Level Sensor contains two resistors: One for engine oil temperature and one for engine oil level.

Conditions for diagnostic trouble code (DTC):
1) The voltage at pin A14.EA:31 is below normal value

Diagnostic operating conditions
1) Ignition key in ON position

Observable symptoms
1) High fuel consumption
2) The engine coolant temperature (ECT) gauge shows 0
3) Engine fan constantly engaged
4) Less powerful engine since the fan takes power from the engine

Probable cause
1) Connector
2) Wiring harness
3) Engine control module (ECM)

The Engine Oil Temperature/Level Sensor contains two resistors: One for engine oil temperature and one for engine oil level.

Conditions for diagnostic trouble code (DTC):
1) The voltage at pin A14.EA:31 is below normal value

Diagnostic operating conditions
1) Ignition key in ON position

Observable symptoms
1) The engine coolant temperature (ECT) gauge shows 0
2) Engine fan constantly engaged

Probable cause
1) Connector
2) Wiring harness
3) Engine oil level (EOL) and temperature sensor
4) Engine control module (ECM)