1993 B2200 & B2600i Throttle Position Sensor
THROTTLE POSITION (TP) SENSOR
See B2200 (CARBURETED) under THROTTLE (IDLE) SWITCH.
B2200 PFI, B2600i & MPV 2.6L
Inspection & Adjustment
1) Warm engine to normal operating temperature. Remove throttle body air inlet hose. Disconnect TP sensor connector. Install Test Harness (49 G018 901) between TP sensor and harness.
2) Turn ignition on. Ensure throttle valve is fully closed. Using a voltmeter capable of measuring voltage variations of .01 volt, measure voltage at Red and Black wires of test harness. See Fig. 11.
3) If voltage is 4.5-5.5 volts at Red wire and about zero volts at Black wire, go to next step. If voltage values are not as specified, check battery voltage and wiring harness between Electronic Control Unit (ECU) and TP sensor. If battery voltage and harness are okay, replace ECU.
4) Record voltage at Red wire. Measure voltage at Blue wire of test harness while varying throttle from closed to wide open position. Ensure voltage is within specification and voltmeter indicates a smooth voltage transition as throttle goes from closed to wide open position. See TP SENSOR VOLTAGE (B2200 PFI, B2600i & MPV 2. 6L) table.
5) If voltage is not as specified, loosen TP sensor screw. Rotate TP sensor until Blue wire voltage is as specified. Tighten TP sensor screw. If TP sensor cannot be adjusted to specification, replace TP sensor. Disconnect negative battery cable and apply brake pedal for 5 seconds to erase ECU memory.
6) If voltage is as specified, turn ignition off. Disconnect test harness. Reconnect TP sensor connector. Disconnect negative battery cable and apply brake pedal for 5 seconds to erase ECU memory.
Without a test harness, you will need to gently pierce or backstab the leads
with a a multi-meter
Fig. 11: TP Sensor Test Harness Terminal ID
Courtesy of Mazda Motors Corp.