Test Function No. 7 - Momentary Values for Engine Coolant Temperature, Engine Speed and Ambient Temperature
- This function is locked and needs to be unlocked via the procedure in Function Test No. 19. The following data can be scrolled through using the trip reset button.
- 'KTMP: 105°C' - This shows the engine coolant temperature. If the ignition is in position II the temperature signal is passed on the CAN to the instrument pack. If the ignition is in position I, the temperature signal is read from the analogue input from the engine coolant temperature sensor to the instrument pack.
- 'N: 248/0 U/min' - This shows the momentary engine speed received on the CAN from the ECM.
- 'ATMP: +20.0°C' - This shows the ambient temperature received from the ambient air temperature sensor.
If error conditions exist, the following table shows the values which will be displayed.
DISPLAYED VALUES
| Signal | Error Condition | Test Function display |
|---|---|---|
| Engine coolant temperature via direct connection to sensor | Short circuit of sensor input to battery voltage | KTMP:-128°C |
| Short circuit of sensor input to ground | KTMP: -128°C | |
| Engine coolant temperature via CAN signal | Coolant temperature error | KTMP: -128°C |
| Ambient temperature | Short circuit of sensor input to battery voltage | ATMP: -40°C |
| Short circuit of sensor input to ground | ATMP: -40°C | |
| Engine speed via CAN | Engine speed = 0 | N: 65535 U/MIN |