"Engine Cranks, No Start and/or Engine Coolant Temperature Faults

Bulletin number

M170115

Component

Engine

Summary

"Engine Cranks, No Start and/or Engine Coolant Temperature Faults. 1 The engine either exhibits a crank, no start or a hard start (long crank), usually on a cold engine. No faults are stored in the DME. Proceed to Correction 1 for further diagnosis. 2 NOTE: The engine may also exhibit the same starting behavior as in Situation1. The Service Engine Soon lamp is illuminated, with one or more of the following fault codes stored in the DME: Engine temperature sensor faults ? 2943 Coolant temperature sensor, signal change too fast ? 2937 Coolant temperature sensor, electrical: short circuit to positive ? 2936 Coolant temperature sensor, electrical: short circuit to earth ? 293A Coolant temperature sensor, plausibility, cold start: temperature too high ? 293B Coolant-temperature sensor, plausibility, cold start: Temperature too low ? 2947 Coolant-temperature sensor, signal: Fixed on low ? 2948 Coolant-temperature sensor, signal: Fixed ? 3393 Engine downtime, plausibility: Time too long in correlation with engine coolant cooling down ? 3392 Engine downtime, plausibility: Time too short in correlation with engine coolant cooling downIf any of the above fault codes are stored, proceed to Correction 2. Engine thermostat faults: ? 348E Characteristic map thermostat, actuation: Short circuit to positive ? 348F Characteristic map thermostat, actuation: Short circuit to earth ? 3490 Characteristic map thermostat, actuation: Open circuit If any of the above fault codes are stored then proceed to Correction 2: The above fault codes for the engine temperature sensor and thermostat are the primary fault codes for turning the Service Engine Soon light on. 1. Poor solder contacts in the engine coolant temperature sensor integrated into the engine thermostat housing 2. A faulty external or replaceable engine coolant temperature sensor (see below for identifying production changes in the thermostat and engine temperature sensors) 3. A faulty map-contro

Owners of these vehicles have filed 545 complaints in the engine category.