Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSFORD1991AEROSTAR VAN CARGO EXTENDED, 4.0 X, AWDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - TESTS W/CODES - 4.0LCODE-TO-TEST MENUSCONTINUOUS CODE-TO-TEST MENU
1991 Ford Aerostar Van Cargo Extended, 4.0 X, AWD
Continuous Code-To-Test Menu
1991 Ford Aerostar Van Cargo Extended, 4.0 X, AWDSECTION Continuous Code-To-Test Menu
CONTINUOUS MEMORY - CIRCUIT TEST & STEP MENU
| Code No. | Description | Go To: Test No. (Step No.) | ||
|---|---|---|---|---|
| 14 | EDIS Ignition Ignition Diagnostic Monitor (IDM) | NC (1) | ||
| 15 | Code 15, 511 Or 512 KOEO Or Continuous Memory Code | QB (1) | ||
| 18 | EDIS Ignition Ignition Diagnostic Monitor (IDM) | NC (2) | ||
| 22 | MAP/BP Sensor | DF (90) | ||
| 29 | Vehicle Speed Sensor (VSS) | DP (1) | ||
| 41 | Fuel Control |
H (1) | ||
| 45 | ..... | (1) | ||
| 51 | Temperature Sensor Test (ACT & ECT) | DA (90) | ||
| 53 | Throttle Position Sensor (TPS) | DH (90) | ||
| 54 | Temperature Sensor Test (ACT & ECT) | DA (90) | ||
| 56 | MASS Airflow Sensor (MAF) | DC (20) | ||
| 61 | Temperature Sensor Test (ACT & ECT) | DA (90) | ||
| 63 | Throttle Position Sensor (TPS) | DH (94) | ||
| 64 | Temperature Sensor Test (ACT & ECT) | DA (90) | ||
| 66 | MASS Airflow Sensor (MAF) | DC (10) | ||
| 67 | Neutral Drive Input | Ta (1) | ||
| 87 | Fuel Pump Circuit (Relay & Inertia Switch) | J (95) | ||
| 95 | Fuel Pump Circuit (Relay & Inertia Switch) | J (90) | ||
| 96 | Fuel Pump Circuit (Relay & Inertia Switch) | J (93) | ||
| No Code/Codes Not Listed | ..... | QA (1) | ||
|
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.