Protege & Protege5 (Only)

WARNING: This page is about a different car, the 2003 Mazda Protege5, 2003 Mazda Protege, 2003 Mazda MX-5 Miata, 2003 Mazda MPV, and 2003 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

Disconnect PCM 104-pin harness connector. Connect 104-Pin Breakout Box (49-UN01-130) to PCM harness connector and then to PCM. See Figure. Turn ignition on. Connect DVOM to breakout box terminal No. 62.
Apply pressure then vacuum to Fuel Tank Pressure (FTP) sensor. See FUEL TANK PRESSURE SENSOR SPECIFICATIONS table. Decrease applied pressure from +1.97 in. Hg to -1.97 in. Hg and verify breakout box terminal No. 62 voltage reading decreases as specified. If FTP sensor faulty, replace FTP sensor. If FTP sensor is okay, but breakout box terminal No. 62 voltage reading is out of specification, disconnect FTP sensor 3-pin harness connector and check wire harness for open or short circuits. Go to next step.

Open Circuit Inspection

Check for continuity between following terminals:

FTP signal circuit between FTP sensor 3-pin harness connector terminal "B" and breakout box terminal No. 62 through common connector. See Fig 1.
Constant voltage circuit between FTP sensor 3-pin harness connector terminal "C" and breakout box terminal No. 90 through common connector.
GND circuit between FTP sensor 3-pin harness connector terminal "A" and breakout box terminal No. 91 through common connector.

If continuity is present, go to next step. If continuity is not present, repair open circuit in suspect wire or replace wire harness. See appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS.

FUEL TANK PRESSURE SENSOR SPECIFICATIONS

Application - Applied Vacuum	Output Voltage
-1.07 in. Hg	.45-.55
0 in. Hg	2.25-2.75
+1.97 in. Hg	4.05-4.95

Short Circuit Inspection

Check for continuity between following terminals:
- FTP signal circuit between FTP sensor 3-pin harness connector terminal "B" and breakout box terminal No. 62 through common connector.
- Constant voltage circuit between FTP sensor 3-pin harness connector terminal "C" and breakout box terminal No. 90 through common connector.
If continuity is present, repair open circuit in suspect wire or replace wire harness. If wire harness is okay, replace FTP sensor.

Fig 1: Identifying FTP Sensor 3-Pin Wire Harness Connector Terminals (Protege & Protege5)

Courtesy of MAZDA MOTORS CORP.