Input Signal System Inspection Procedure: Notes
- Find an irregular signal. (See Finding irregular signals.)
- Locate source. (See Locating the source of unusual signals.)
- Repair or replace the malfunctioning part.
- Confirm that the irregular signal is no longer detected.
Finding irregular signals
- While referring to ON-BOARD DIAGNOSTIC TEST [MZR 2.5]ON-BOARD DIAGNOSTIC - [MZR 2.5] , use the PID/DATA monitor and record function to inspect the input signal system relating to the problem.
- Start the engine and idle the vehicle. You can assume that any signals that are out of specification by a wide margin are irregular.
- When recreating the problem, any sudden change in monitor input signals that is not intentionally created by the driver can be determined as irregular.
Locating the source of unusual signals
CAUTION:
- 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 ground to the ground 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.
Thermistor type (IAT sensor and ECT sensor)
Input signal system inspection for thermistor type
- 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 the following points concerning the PCM connector:
- Female terminal opening loose
- Coupler (pin holder) damage
- Pin discoloration (blackness)
- Harness/pin crimp is loose or disconnected.
- 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.