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TECHNICAL SERVICE BULLETIN No.108/1994
Car and Light/Medium Commercial 17.10.1994
Section: 29
Model: '91 MY Escort/Orion and Fiesta with 1,4 CFI CVH engine and manual transmission
Markets: All
Subject: Excessive fuel consumption
Summary
Should a customer express concern regarding excessive fuel consumption, this may be due to the Engine Coolant Temperature (ECT) sensor not sampling true coolant temperature (reading low), resulting in excessive fuel being supplied to the engine. Relocation of the ECT sensor to the heater inlet hose as detailed in this service bulletin will overcome this concern.
This bulletin replaces TSB 108/1994 dated 17.10.94. It details the fitment of a T-piece into the heater inlet hose allowing the ECT sensor to relocated. Please destroy the previous issue of this bulletin.
Parts Required
Description Finis Code
T-peice 6 014 271
hose clips (x2) 0 241 209
Blanking plug 1 503 089
Thread-sealing compound 1 648 365
Labour Time
Engine Coolant Temperature sensor - relocate 0,8 Hours
Repair Codes
Causal Part: 29 190
Defect Code: 52
Service Instructions
Should a condition occur as outlined in the Summary then it is recommended that the vehicle is reworked as detailed below:
NOTE:
Before disconnecting the battery, ensure that the radio keycode is available and make a note of the preset radio stations to allow reprogramming.
1. Disconnect the battery negative lead.
2. Drain the engine coolant system (refer to the relevant Service Microfiche, Operation number 24 122 0).
3. Slacken and remove the air filter retaining screws(3 screws), Fig. 1.
4. Disconnect the air filter intake tube
5. Disconnect the vacuum hose to the carburettor from the underside of the air cleaner
6. Disconnect the ECT multiplug from the ECT sensor at the inlet manifold, Fig.2, and remove the ECT sensor.
7. Clean away any traces of sealant etc from the hole inthe inlet manifold then fit the blanking pluf (see Parts Required) usingthread-sealing compound (see Parts Required).
8. Cut the heater inlet hose approximately 50mm from the enlarged section, Fig. 3.
9. Fit the T-piece (see Parts Required) between the two cut ends of heater inlet hose and secure with two hose clips (see Parts Required).
10. Fit the ECT sensor (removed from the inlet manifold) into the T-piece and reconnect the ECT sensor multiplug to the ECT sensor.
11. Refit the air cleaner assembly in the reverse order through steps 3 to 5.
12. Re-fill coolant system (refer to the relevant ServiceMicrofiche, Operation number 24 122 0).
The ECT sensor wiring needs to be checked to see whether any resistors have been fitted to/from or across the ECT. This is achieved with the use of a Break Out Box (BOB) and is carried out as detailed below:
13. Gain access to the EEC IV module and disconnect the multiplug (refer to the relevant Service Microfiche, Operation Number 29 200 0).
14. Connect a Break Out Box with lead number 6A (Special Tool 29-009A) to the wiring loom side of the multiplug and tighten the securing bolt.
NOTE:
Ensure that the Break out Box is connected to the wiring loom side of the EEC IV module - not to the EEC IV module itself.
15. With a suitable meter check the resistance between pins 7 and 46 of the BOB with the ECT multiplug removed - should be open circuit.
16. With a suitable meter check the end/end resistance of both ECT wires, ie. - pin 7 to ECT multiplug and pin 46 to ECT multiplug. Should be short circuit in both cases.
If any deviations from the expected results are found in steps 15 through 16, then checks should be made for any resistors that may have been fitted along the ECT wiring. Any resistors found should be removed, to prevent the EEC IV module receiving a false signal from the ECT sensor.
17. Reconnect the ECT sensor.
18. Disconnect the BOB and reconnect the EEC IV wiring loom to the module and tighten the securing bolt.
19. Refit the module to the vehicle (refer to the relevant Service Microfiche, Operation Number 29 200 0).
20. Reconnect the battery negative lead, enter the radio keycode and reprogramme the preset stations. Set the clock to the correct time.
21. Start the engine and allow it to reach normal operating temperature, then allow it to idle for a further 3 minutes. This enables the EEC IV module to relearn the correct hot idle control motor position. Switch off the engine.