Engine RPM Sensor - Diagnostic Procedure Revision

89Ford27

ENGINE EMISSIONS DIAGNOSIS MANUAL, VOLUME H-1989-PAGE 17-144-7.3L ENGINE WITH E40D TRANSMISSION-ENGINE RPM SENSOR DIAGNOSTIC PROCEDURES REVISED
Article No. 89-18A-14
LIGHT TRUCK: 1989 E-250, E-350, F-250, F-350
ISSUE: The engine RPM sensor diagnostic procedure for the 7.3L Diesel with E40D Transmission only in the 1989 Engine Emissions Diagnosis Shop Manual, Volume H, has been revised. A Key On Engine Running Self-Test Code 23 directs service to the Fuel Injection Pump Lever (FIPL) Position Sensor which may or may not be the accurate problem cause. If an Engine I.D. Code of 5.0 is not present in Self-Test or a Continuous Memory Code 14 is received, the Engine RPM sensor circuit is the most likely problem cause.
ACTION: Refer to the pages following this TSB for the revised diagnostic procedures.

OTHER APPLICABLE ARTICLES: None
WARRANTY STATUS: INFORMATION ONLY
OASIS CODES: 680000

EEC-IV - Pinpoint Tests - All Vehicles 1989 17-143


Fuel Injection Pump Lever
Pinpoint Test DQ
(FIPL) Position Sensor


Note


You should enter this Pinpoint Test only when a Service Code 23, 53, or 63 is received in Quick Test Step 3.0, 5.0 or 6.0.


Remember


To prevent the replacement of good components, be aware that the following non-EEC areas may be at fault:

^ Idle speeds/throttle stop adjustment.

^ Binding throttle shaft/linkage or speed control linkage.

^ Choke/high cam system, if equipped.

This Pinpoint Test is intended to diagnose only the following:

^ FIPL sensor (-9B989-)

^ Sensor harness circuits: VREF, FIPL SIGNAL, and SIGNAL RETURN

^ Processor assembly (-12B565-)




Pinpoint Test Schematic




17-144 1989 EEC-IV - Pinpoint Tests - All Vehicles


Fuel Injection Pump Lever

Pinpoint Test DQ

(FIPL) Position Sensor