Mazda CX-9 Grand Touring 2009 Manual page 1393

GND system inspection for variable resistance type 2
Confirm that terminal sensor #4 is at 0 V.
If it is at 0 V , inspect the sensor.
If necessary, replace the sensor.
If not at 0 V , inspect for the following:
Open circuit in wiring harness
Female terminal opening is loose.
Coupler (pin holder) damage
Pin discoloration (blackness)
Harness/pin crimp is loose or disconnected.
Input signal system inspection for variable resistance type 2
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 the following points concerning the
sensor connector:
Female terminal opening is loose.
Coupler (pin holder) damage
Pin discoloration (blackness)
Harness/pin crimp is loose or disconnected.
If there are no problems, proceed to next investigation below.
Electrical supply system inspection for variable resistance type 2
Confirm that the sensor #3 terminal is B+.
If the measured voltage on the #3 terminal is B+ , inspect the following points on the sensor
connector.
If there is no problem, inspect for the following:
Female terminal opening is loose.
Coupler (pin holder) damage
2008 Mazda CX-9 Grand Touring
2008 ENGINE Symptom Troubleshooting (MZI-3.7) - Mazda CX-9