Ford vehicles manufactured before 1996 are equipped with the OBD1 diagnostic system which is unique in the way trouble codes are retrieved. Each Ford car before 1996 has the data connector in a different place such us under the hood near the left fender or close to the cowl on the right side. It can be hidden by a cover or a dead end connector. The connector shape is the same for all Ford OBD1 vehicles.
Ford OBD1 Code Gathering
- A test light is needed
- Located OBD1 Data connector
- Turn key on without starting engine
- Count the number of flashes (2 sets)
- Record and combine digits such as 3 flashed and 4 flashes = 34
- Lookup code definition for repair
Let's Get Started
- Located the OBD1 data connector usually under the hood on the left side
but it could be on the right near the firewall or battery. Here is what the
connector looks like
- Insert a test
light into the test connector to observe when the key is turned on, also
attach a jumper wire from the connector to the signal connector along side of
the OBD1 port.
- Turn the key to the on position. This will initiate the code gathering sequence
which be produced in the form of two digits. Count the first set of flashes
on the test light and record it such as 2. The flashing will pause then start
again delivering the sound part of the code such as 5 creating the code 25.
- Once repairs have been made to clear the codes remove the negative battery cable for thirty seconds and reconnect.
What do they mean?
Here is the Ford OBD1 trouble code identification table
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11 - System pass
12 - Idle control fault
13 - DC motor did not move
14 - engine rpm signal fault or PIP circuit failure
15 - EEC processor or power to KAM interrupted
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16 - rpm to low to check oxygen sensor test or fuel control error
17 - CFI fuel control system fault or rich/lean condition indicated
18 - Ignition diagnostic monitor (IDM) circuit failure
19 - Cylinder identification (CID) sensor input failure
21 - Engine coolant temperature (ECT) out of self-test range
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22 - Manifold absolute pressure (MAP) sensor circuit out of range
23 - Throttle position sensor out of self-test range
24 - Air charge temperature (ACT) sensor out of self-test range
25 - Knock not sensed during dynamic response test
26 - Transmission fluid temperature out of self-test range
28 - Loss of primary tachometer, right side
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29 - Insufficient input from vehicle speed sensor
31 - EGR position sensor below minimum voltage
32 - EGR position sensor below closed limit
33 - Throttle position sensor noisy/harsh on line
34 - EGR valve circuit out of self-test range
35 - EGR valve circuit above maximum voltage
38 - Idle track switch circuit open
39 - AXOD torque converter or bypass clutch not applying properly
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41 - Oxygen sensor circuit indicates system always lean
42 - Oxygen sensor circuit indicates system always rich
43 - Oxygen sensor out of self-test range
44 - Air injection control system failure
45 - Coil 1 primary circuit failure
46 - Coil primary circuit failure
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47 - 4X4 switch is closed or oxygen sensor failure
48 - Coil primary circuit failure
49 - Electronic transmission shift error
51 - Engine coolant temperature sensor circuit open
52 - Power steering pressure switch circuit open
53 - Throttle position circuit above maximum voltage
54 - Air charge temperature circuit open
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55 - Key power input to processor open circuit
56 - Mass air flow circuit above maximum voltage
57 - AXOD circuit failure
58 - Idle tracking switch circuit fault
59 - Automatic transmission shift error
61 - Engine coolant temperature circuit grounded
62 - Converter clutch error
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63 - Throttle position circuit below minimum voltage
64 - Air charge temperature circuit grounded
65 - Charging system over voltage
66 - Mass air flow sensor circuit below minimum voltage
67 - Neutral/drive switch circuit open
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68 - Transmission fluid temperature over temperature transmission shift error
70 - Data circuit communication link circuit failure
71 - Message center circuit failure
72 - Insufficient manifold absolute pressure (MAP) change during dynamic response test
73 - Insufficient throttle position (TPS) change during dynamic response test
74 - Brake on/off (BOO) circuit open
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75 - Brake on/off (BOO) circuit closed
76 - Insufficient air flow output change during test
77 - Brief wide open throttle not sensed during test
78 - Power interrupt detected
79 - A/C on/defrost on during self test
81 - Map has not changed normally
82 - Super charger bypass circuit failure
83 - OIC-low speed fuel pump relay circuit failure
84 - EGR vacuum regulator (EVR) circuit failure
85 - Canister purge circuit failure
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86 - Shift solenoid circuit failure
87 - Fuel pump circuit failure
88 - Electro drive fan circuit failure
89 - Transmission solenoid circuit failure
91 - No oxygen sensor switching detected
92 - Shift solenoid circuit failure
93 - Throttle position sensor input low
94 - Torque converter clutch solenoid circuit failure
95 - Fuel pump secondary circuit failure
96 - Fuel pump secondary circuit failure
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97 - Transmission indicator circuit failure
98 - Electronic pressure control circuit failure
99 - EEC has not learned to control idle
Questions?
Our certified technicians are ready to answer Ford OBD1 Code questions for free. We hope you saved money and learned from this guide. We are creating a full set of car repair guides. Please subscribe to our 2CarPros YouTube channel and check back often for new videos which are uploaded regularly.
Article published 2022-03-11
