Test Point 2 - Engine temp sensor 2

TEST POINT 2 - Engine temp. sensor (ECTS II/Ohms) - Fault code 1_14

Possible Causes, Elimination, Remarks
Using System Tester 9288, the engine temperature can be read off directly under menu item "Actual values".

Test procedure: If no plausible display:

Connect ohmmeter to terminal 45 and terminal 14 of the disconnected Digital Motor Electronics (DME) control unit plug with the help of test leads.

Display at: 0°C = 4.4-6.8 kOhms
15-30°C = 1.4-3.6 kOhms
40°C = 1-1.3 kOhms
80°C = 250-390 Ohms
100°C = 160-210 Ohms

If the above values are not obtained, check directly at engine temperature sensor.

NOTE: Temperature sensor 2 informs the control unit of the engine temperature. It provides additional fuel in the cold starting and warm-up stages of engine operation.

Open circuit (Infinite, Ohms):
The DME control unit adjusts to a value pre-set in the control unit that approximately corresponds to that of the engine at operating temperature. When the engine is warm, enrichment by the faulty temperature sensor 2 does not occur (emergency running program). This results in starting problems when the engine is cold (no cold start enrichment).

Short circuit to ground:
When engine is cold: No engine pickup, too lean, engine stops. No effect if engine is at operating temperature.

Replacement value is applicable to both types of fault!