Test Point 4 - Engine Temperature Sensor II
TEST POINT 4 - Engine temperature sensor II (Ohms) - Fault code 1_14Possible Causes, Elimination, Remarks
Disconnect the LH control unit plug.
- Connect the ohmmeter to terminals 13 and 5 or 17 of the LH control unit plug using the test leads.
Display: resistance
Test values at:
0°C = 4.4-6.8K ohms
15-30°C = 1.4-3.6k ohms
40°C = 1-1.3K ohms
80°C = 250-290 ohms
100°C = 100-210 ohms
If the values are not reached, check directly at the engine temperature sensor. Do not connect both contact tabs to the ohmmeter, but check each contact tab separately against ground (there are 2 independent temperature sensors).
1 - EZK
2 - LH
NOTE: Temperature sensor II supplies the cylinder head temperature to the control unit. It is responsible for mixture enrichment during cold starts and when the engine is warming up.
Break (Infinite resistance):
The LH control unit reverts to a fixed, previously stored program. If the engine is warm, there is no mixture enrichment. If the engine is cold, however, this causes starting problems (since there is no cold-start enrichment).
Short circuit (0 Ohms):
When the engine is cold it does not respond to the throttle being opened; the mixture is too weak and the engine stalls. No effect at regular operating temperature.