Fuel Pump Operation Inspection; Fuel Pump Control System Inspection; Spark Test - Mazda 3 Workshop Manual

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
- TR switch and related wiring harness (ATX) (See
INSPECTION.)

Fuel Pump Operation Inspection

1. Connect the WDS or equivalent to the DLC-2.
2. Remove the fuel-filler cap.
3. Turn the ignition switch to the ON position.
4. Turn the fuel pump relay from off to on using the FP PID and inspect if the operation sound is heard.
• If no operation sounds is heard, proceed to next step.
5. Measure the voltage at wiring harness-side fuel pump terminal A.
Specification
B+ (Ignition switch is ON position)
• If the voltage is as specified, inspect the following.
- Fuel pump continuity
- Fuel pump GND
- Wiring harness between fuel pump relay and PCM terminal 1AH (without immobilizer system),
1AC (with immobilizer system)
• If not as specified, inspect the following.
- Fuel pump relay (See
- Wiring harness and connector (Main relay-fuel pump relay-fuel pump)

Fuel Pump Control System Inspection

1. Connect the WDS or equivalent to the DLC-2.
2. Turn the ignition switch to the ON position.
3. Access FP PID.
4. Turn the fuel pump relay from off to on and inspect if the operation sound of the fuel pump relay is
heard.
• If no operation sound is heard, inspect the fuel pump relay.
• If the fuel pump relay is normal, inspect the following.
- Wiring harnesses and connectors (Main relay-fuel pump relay-PCM)

Spark Test

1. Remove the fuel pump relay.
2. Verify that each ignition coil and connector is connected properly.
3. Inspect the ignition system in the following procedure.
Downloaded from
RELAY INSPECTION.)
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TRANSAXLE RANGE (TR) SWITCH
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