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.
1997 Mazda B2300 Base, AutomaticFACTORY OEM SERVICE PROCEDURE
Idle Air Control (IAC) Solenoid
- If IAC solenoid circuit is open or shorted, a Diagnostic Trouble Code (DTC) should set. See appropriate TESTS W/CODES article. If any DTCs are present, repair as necessary. If no DTCs are present, go to next step.
- To check IAC solenoid, connect New Generation Star (49 T088 0A0) scan tool to Data Link Connector (DLC) 2. DLC is located under left side of instrument panel, right of steering column. Turn ignition on. Using scan tool, access DIAGNOSTIC DATA LINK menu, and select PCM. Highlight and select PID/DATA MONITOR AND RECORD.
- Start engine and operate at idle. Using scan tool, access IAC PID and record value while operating vehicle under specified condition. See IDLE AIR CONTROL (IAC) SOLENOID SPECIFICATIONS table. If IAC PID value is not as specified, go to next step.
- Turn ignition off. Disconnect IAC solenoid connector. Using ohmmeter, measure resistance between IAC solenoid terminals. A diode is located in solenoid; connect ohmmeter positive test lead to VPWR terminal (Red wire) and negative lead to IAC SIG terminal (White/Light Blue wire). Resistance should be 6-13 ohms at 68°F (20°C). If resistance is not as specified, replace IAC solenoid.
IDLE AIR CONTROL (IAC) SOLENOID SPECIFICATIONS
| Condition | Volts | % Duty Cycle |
|---|---|---|
| Ign On/Eng Off | VBAT | 0 |
| Hot Idle | 11.5-VBAT | 28-32 |
| 30-55 MPH | 10.1-10.9 | 30-55 |
| 55-65 MPH | 8.7-10.1 | 60-65 |
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
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.
Rather have a pro handle this?
A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.
Comes to youSame-day available12-month warranty
Get a Free QuoteNo obligation. See pricing before you book.