I was just comparing my list of service codes (for 1991 Aerostar, Bronco, Explorer, Ranger, E- and F- Series) to those in the FAQ and have noted the following discrepancies:
14 7.3L Diesel (c): Engine RPM Sensor circuit failure
16 (o): IDM signal not received.
18 2.3L (r): SPOUT circuit open
(c): Erratic IDM input to processor
4.0L (r): SAW circuit failure
(c): Loss of IDM input to processor/IDM circuit failure
All Others (r): SPOUT circuit open
(c): Loss of IDM input to processor/SPOUT ckt grounded
23 7.3L Diesel (or): Fuel Injection Pump Lever (FIPL) circuit is out of self-
test range.
26 2.9L/4.0L (or): MAF (Mass Air Flow) signal out of range.
All Others (or): Transmission Oil Temperature (TOT) sensor our of range.
28 (c): Loss of IDM - Right Side.
39 (c): AXOD lock-up failure
41 (c): no HEGO switching detected.
45 4.0L (c): Coil 1, 2 or 3 failure
47 (o): 4x4 switch is closed. (E40D)
48 (c): Loss of IDM - Left Side
49 (c): 1 - 2 shift error (E40D).
53 7.3L Diesel (oc): Fuel Injection Pump Lever (FIPL) circuit is greater than
maximum voltage.
56 2.9L/4.0L (oc): MAF sensor voltage too high.
All Others (oc): Transmission Oil Temperature (TOT) indicated -40F, circuit
open (E40D)
57 (c): AXOD Neutral Pressure Switch (NPS) circuit failed open.
59 (c): 2 - 3 shift error (E40D).
62 (c): Converter Clutch error (E40D).
63 7.3L Diesel (oc): Fuel Injection Pump Lever (FIPL) circuit is below
minimum voltage.
65 (r): Overdrive Cancel Switch (OCS) not changing state (E40D).
66 2.9L/4.0L (oc): MAF circuit below minimum test voltage.
All Others (oc): Transmission Oil Temperature (TOT) indicated 290F, circuit
grounded (E40D).
67 (o): Neutral Drive Switch (NDS) open, AC left on.
2.9L/4.0L (c): Clutch switch circuit failure.
All Others (c): Manual Lever Position (MLP) is out of range; A/C on (E40D)
69 (c): 3 - 4 shift error (E40D).
86 (o): Shift Solenoid (SS) circuit failure.
88 (o): Loss of dual plug input control.
89 (o): Converter Clutch Override (CCO) circuit failure.
91 (o): Shift Solenoid 1 (SS1) circuit failure (E40D)
92 (o): Shift Solenoid 2 (SS2) circuit failure (E40D)
93 (o): Coast Clutch Solenoid (CCS) circuit failure (E40D).
94 (o): Coast Clutch Control (CCC) solenoid circuit failure (E40D).
97 (o): Overdrive Cancel Light (OCIL).
98 (o): Electronic Pressure Control (EPC) driver open in ECA (E40D).
99 (oc): Electronic Pressure Control (EPC circuit failure (E40D).
















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