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 MANUALSMAZDA1991NAVAJO LX, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - TESTS W/CODES - 4.0LCODE-TO-TEST MENUSKOER CODE-TO-TEST MENU
1991 Mazda Navajo LX, Automatic
KOER Code-To-Test Menu
1991 Mazda Navajo LX, AutomaticSECTION KOER Code-To-Test Menu
KOER SELF-TEST - CIRCUIT TEST & STEP MENU
| Code No. | Description | Go To: Test No. (Step No.) |
|---|---|---|
| 12 | Idle Speed Control (Air By-Pass) | KE (1) |
| 13 | Idle Speed Control (Air By-Pass) | KE (15) |
| 18 | Spark Timing Check (EDIS Vehicles) | PC (1) |
| 21 | Temperature Sensor Test (ACT & ECT) | DA (1) |
| 22 | MAP/BP Sensor | DF (1) |
| 23 | Throttle Position Sensor (TPS) | DH (1) |
| 24 | Temperature Sensor Test (ACT & ECT) | DA (1) |
| 26 | MASS Airflow Sensor (MAF) | DC (1) |
| 41 | Fuel Control | H (1) |
| 42 | Fuel Control | H (1) |
| 56 | MASS Airflow Sensor (MAF) | DC (20) |
| 72 | MAP/BP Sensor | DF (10) |
| 73 | Throttle Position Sensor (TPS) | DH (20) |
| 74 | Brake On-Off (BOO) Switch | FD (1) |
| 77 | Dynamic Response Test | M (1) |
| 98 | ..... | Go to QUICK TEST |
| No Code/Codes Not Listed | ..... | QA (1) |
RENDER: 1.0x
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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.