What does code 87 mean?

Code 87 indicates a fuel pump primary circuit failure. It is listed three times with different Quick Test Modes (O/C, O/C/R, and O) depending on the application.

What does it mean if no codes are output during self-test?

The chart states 'No Codes: Cannot begin self-test or cannot transmit codes.' Codes not listed do not apply to the vehicle being tested.

What engines does this diagnostic code chart cover?

The columns cover the 2.5L FLC CFI, 3.0L EFI, 3.0L SHO SEFI, and 3.8L AXOD SEFI engine/fuel system combinations.

What does code 99 mean?

Code 99 (engine running test) means the EEC has not learned to control idle; ignore codes 12 & 13.

What do the circled numbers next to the HEGO codes 91 and 92 indicate?

They identify which oxygen sensor is involved: ① Front HEGO, ② Right HEGO, ③ Left HEGO, ④ Rear HEGO.

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Ford Taurus/Sable EEC-IV Diagnostic Trouble Codes 53-99 Chart - 2.5L 3.0L 3.8L

Ford EEC service-code diagnostic chart (Emission Controls 4-2x) listing fault codes by fuel system

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Emission Controls service-code chart cross-referencing EEC trouble codes to descriptions and applicable engine/fuel systems (CFI, 2.3L, 3.8L, 5.0L, 5.8L SEFI); page 4-2x.

Part of 1992-1995 Ford Taurus Service Procedures

AI caption January 2004 · Photo 2 of 6

This is page 4-21 of an emission controls service reference showing Ford EEC-IV self-test diagnostic service (trouble) code tables. Two tables list two-digit service codes from 53 through 99, each with a description of the fault (e.g., '54: ACT sensor circuit open', '63: TP circuit below minimum voltage', '87: Fuel pump primary circuit failure', '95: Fuel pump secondary circuit failure, ECA to ground'), the Quick Test Mode in which the code appears (O = key on/engine off test, R = key on/engine running test, C = continuous memory), and checkmarks indicating which engine/fuel-system combinations each code applies to: 2.5L FLC CFI, 3.0L EFI, 3.0L SHO SEFI, and 3.8L AXOD SEFI. Codes cover TP, ACT, VAF/MAF, ECT, VAT, HEGO sensors, idle tracking switch, AXOD transaxle pressure switches, EGR, canister purge, fuel pump circuits, electro drive fan, brake on/off switch, and self-test operator errors. Footnotes explain that 'No Codes' means the self-test cannot begin or transmit, codes not listed do not apply to the vehicle, and numbered symbols identify Front, Right, Left, and Rear HEGO sensors. A reader can use this chart to interpret EEC-IV codes pulled during Key On Engine Off, Engine Running, or Continuous Memory tests. Figure numbers 86874066 and 86874067 appear below the tables.

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Frequently asked questions

What do the letters O, R, and C mean in the Quick Test Mode column?: Per the footnotes: O = Key on, engine off test; R = Key on, engine running test; C = Continuous memory.
What does code 87 mean?: Code 87 indicates a fuel pump primary circuit failure. It is listed three times with different Quick Test Modes (O/C, O/C/R, and O) depending on the application.
What does it mean if no codes are output during self-test?: The chart states 'No Codes: Cannot begin self-test or cannot transmit codes.' Codes not listed do not apply to the vehicle being tested.
What engines does this diagnostic code chart cover?: The columns cover the 2.5L FLC CFI, 3.0L EFI, 3.0L SHO SEFI, and 3.8L AXOD SEFI engine/fuel system combinations.
What does code 99 mean?: Code 99 (engine running test) means the EEC has not learned to control idle; ignore codes 12 & 13.
What do the circled numbers next to the HEGO codes 91 and 92 indicate?: They identify which oxygen sensor is involved: ① Front HEGO, ② Right HEGO, ③ Left HEGO, ④ Rear HEGO.