Diagnosis - Troubleshooting table (preglow system)
Complaint | Possible cause | Remedy/test step 1) |
Preglow warning lamp does not come on when preglow system switched on. Engine can be started. | Bulb Open circuit or short circuit in wiring | 24 1.0 |
Preglow warning remains on. | Preglow time relay (N14) sticking | Preglow time relay (N14) |
Preglow warning lamp does not come on, engine cannot be started. | Preglow time relay (n14) No voltage supply to preglow time relay (N14) | 24 2.0 |
Preglow warning lamp does not come on when preglow system switched on or comes on for about 1 minute when driving. Engine difficult to start. | Open circuit of one or more pencil-type glow plugs or wiring to glow plugs Fault in current consumption of glow plugs | 24 3.0 |
Preglow time until preglow warning lamp goes out too short or too long. | Coolant temperature sensor after-glow (B11/8) Wiring to preglow temperature sensor (B11/8) | 24 4.0 |
1) Pay attention to preconditions for test.
Note regarding preglow circuit An electronic short circuit protection is installed in the preglow time relay. In the event of a short circuit in the glow plugs or in the wiring to the glow plugs, the circuit is interrupted. The preglow time relay is operational again once the short circuit has been rectified and the ignition key is turned back to position "0". |
Referenced documents
- ad0000p1000az Connecting and using test equipment
- dh0000p10an00x 00 - Use of the diagnosis manual Diagnosis - Diesel engine Engines 601.913, 604, 605.910, 605.912, 605.960, 606.912
- dh0000p10up00x 00 - Overview of test descriptions Diagnosis - Diesel Engine Volume 1.1 Engines 601.913, 604, 605.910, 605.912, 605.960, 606.912
- dh0000p10vt00x 00 - Foreword Diagnosis - Diesel engine Volume 1.1 Engines 601.913, 602.982, 604, 605.910/912/960, 606.912
- dh0101p100011x 1.1 - Electronic distributor type fuel injection (EDFI) 11 - Diagnosis - Fault memory Engine 604 EDFI, Model 202
- dh0101p100022x 1.1 - Electronically controlled distributor type injection system (EDFI) 22 - Test program - Electrics - Conditions for test Engine 604 EDFI in Model 202
- dh0101p100023x 1.1 - Electronic distributor type fuel injection (DFI) 23 - Test program - Electrics, Testing Engine 604 DFI in Model 202
- dh0101p100031x 1.1 - Electronically controlled distributor type injection system (EDFI) 31 - Routing of the vacuum lines Engine 604 EDFI in Model 202
- dh0101p110021x 1.1 - Electronically controlled distributor type injection system (EVE) 21 - Test program - Electrics - Location of components (body-mounted) Engine 604 EVE in Model 202
- dh0101p110024x 1.1 - Electronically controlled distributor type injection system (EVE) 24 - Test program - Electrics - Test (pre-glow system) Engine 604 EVE in Model 202