Code
P1415
MAZDA
P — Powertrain
Air Pump Circuit
Views:
UK: 34
EN: 61
RU: 31
AI status
Completed
Completed
100%
Causes
- Blown fuse for air pump circuit
- Faulty air pump motor (worn, seized, high current draw)
- Bad air pump relay or relay socket
- Open, shorted, corroded or damaged wiring/connectors in pump power/ground or control circuit
- Failed pump motor ground or poor chassis ground
- Faulty air injection check valve or diverter valve causing hydraulic/mechanical load
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Failed emissions test (elevated cold-start emissions)
- No audible air pump noise during cold start
- Rough or richer-than-normal cold idle
- Possible trouble starting in cold conditions
- Stored/active P1415 trouble code(s) in ECM
What to check
- Retrieve freeze frame data and full list of stored codes before clearing
- Visually inspect air pump, relay, fuse, wiring harness, and connectors for damage, corrosion, loose pins, and water intrusion
- Check fuse for continuity and correct rating
- Verify relay operation (swap with similar known-good relay if available)
- Inspect ground strap(s) and chassis ground near pump for corrosion and secure attachment
- Listen for pump operation on cold start (when commanded)
Signal parameters
- Battery voltage at pump power feed with ignition ON (key on, engine off): 11.5–14.5 V expected
- Voltage at pump power feed while ECM commands pump ON: near battery voltage (switched supply)
- Control signal from ECM: ground-switched or 0–12 V command (model dependent)
- Pump motor resistance (bench): manufacturer-specific, typically low ohms (a few ohms) — very high or infinite = open; near 0 = possible short
- Pump current draw while operating: should be within manufacturer spec (excessive current indicates mechanical/electrical fault)
- Continuity/resistance of harness between pump and ECM/relay/ground: near 0 Ω expected
Diagnostic algorithm
- Read and record all codes and freeze-frame data. Clear codes and attempt to re-run to confirm the fault is repeatable.
- Perform a visual inspection of pump, harness, connector, relay, fuse, and ground. Repair any obvious damage or corrosion.
- With ignition ON, check fuse continuity and presence of battery voltage at pump power feed. Replace blown fuse if present, then retest.
- Verify relay operation: swap with identical known-good relay or bench-test relay. Check for voltage at relay output when ECM commands pump.
- Backprobe pump connector: measure voltage at power feed and ground while commanding pump ON (using scan tool/active test). If pump not receiving power, trace back to relay/fuse/ECM.
- If pump receives proper voltage but does not run, disconnect harness and bench-test pump with battery (briefly) to confirm operation and measure current. If pump fails or draws excessive current, replace pump.
- If pump runs on bench but not in-vehicle, check wiring continuity and grounds between pump and relay/ECM. Repair open/shorts, clean and tighten grounds and connectors.
- Inspect/check valve and downstream plumbing for obstructions that could stall the pump; repair as needed.
- If wiring, relay, pump and fuses are good and commands are correct, suspect control module fault. Confirm with manufacturer data and consider ECM testing or replacement per workshop procedures.
- After repairs, clear codes and perform functional/drive cycle to confirm code does not return and system operates correctly.
Likely causes
- Blown fuse or faulty relay
- Failed/locked air pump motor
- Damaged wiring or poor connector/ground at the pump
- Corroded pump connector or high resistance in power feed
Fault status
Status
ECM detected malfunction in the secondary air injection (air pump) control circuit — open/short/low-voltage/high-current or no operation detected. MIL set.
Repair difficulty: Medium
Diagnostic time: 1.0 - 2.5 hours
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