Mazda CX-9 Grand Touring 2009 Manual page 1391

CAUTION:
Variable resistance type 1 (TP sensor)
Fig. 13: Variable Resistance Type 1 (TP Sensor)
Courtesy of MAZDA MOTORS CORP.
Input signal system inspection for variable resistance type 1
1. When an irregular signal is detected, measure the #1 PCM terminal voltage.
If the #1 terminal voltage and the M-MDS monitor voltage are the same, proceed to the next step.
If there is a difference of 0.5 V or more , inspect for the following points concerning the PCM
connector:
Female terminal opening is loose.
Coupler (pin holder) damage
Pin discoloration (blackness)
Harness/pin crimp is loose or disconnected.
2. Measure the #2 sensor terminal voltage.
If there is a 0.5 V or more difference between the sensor and the M-MDS voltages, inspect the
wiring harness for open or short circuits.
If the sensor and the M-MDS voltages are the same, inspect for the following points concerning the
sensor connector:
Female terminal opening is loose.
2008 Mazda CX-9 Grand Touring
2008 ENGINE Symptom Troubleshooting (MZI-3.7) - Mazda CX-9
Compare the M-MDS monitor voltage with the measurement voltage
using the digital measurement system function. If you use another
tester, misreading may occur.
When measuring voltage, attach the tester GND to the GND of the
PCM that is being tested, or to the engine itself. If this is not
performed, the measured voltage and actual voltage may differ.
After connecting the pin to a waterproof coupler, confirming
continuity and measuring the voltage, inspect the waterproof
connector for cracks. If there are any, use sealant to fix them. Failure
to do this may result in deterioration of the wiring harness or terminal
from water damage, leading to problems with the vehicle.