Water Sprinkling Method
| CAUTION | Indirectly change the temperature and humidity by spraying water onto the front of the radiator. If a vehicle is subject to water leakage, the leakage may damage the control module. When testing a vehicle with a water leakage problem, special caution must be used. |
If the malfunction occurs only during high humidity or rainy/snowy weather, perform the following steps
Scheme 471
- Connect the WDS or equivalent to the DLC-2 if you are inspecting sensors or switches.
- Turn the ignition switch to the ON position (Engine off). NOTE: If the engine starts and runs, perform the following steps at idle.
- Access the PIDs for sensors or switches if you are inspecting sensors or switches.
- If you are inspecting the switch, turn it on manually.
- Spray water onto the vehicle or run it through a car wash. If the PID value is unstable or malfunction occurs, repair or replace the part if necessary.
Input Signal System Investigation Procedure
- Find an unusual signal. (See «FINDING UNUSUAL SIGNALS»(ref-178317-S15155954672005061400000) .)
- Locate its source. (See «LOCATING THE SOURCE OF UNUSUAL SIGNALS»(ref-178317-S40514255722005061400000) .)
- Repair or replace the defective part.
- Confirm that the unusual signal has been erased.
Finding Unusual Signals
While referring to ON-BOARD DIAGNOSTIC TEST , 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 the specifications by a wide margin are unusual.
- When recreating the problem, any sudden change in monitor input signals that is not consciously created by the driver can be judged as unusual.
Locating The Source Of Unusual Signals
| CAUTION | Compare the WDS or equivalent 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 done, 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. |
Hall or piezo-electric type (TP sensor, APP sensor, APV position sensor and BARO sensor)
Scheme 472
Investigate the input signal system for hall or piezo-electric type
- When you get an unusual signal, measure the #1 PCM terminal voltage. If the #1 terminal voltage and the WDS or equivalent 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) Wiring 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 WDS or equivalent voltages, inspect the wiring harness for an open or short circuits. If the sensor and the WDS or equivalent voltages are the same, inspect for the following points concerning the sensor connector: Female terminal opening is loose. Coupler (pin holder) damage Pin discoloration (blackness) If there are no problems, proceed to next investigation.
Investigate The Standard Power Supply System For Hall Or Piezo-Electric Type
- Confirm that the #3 terminal is at 5 V . If the measured voltage on the #3 terminal is 5 V , inspect the following points on the sensor connector. If there is no problem, inspect for the following: Female terminal opening loose Coupler (pin holder) damage Pin discoloration (blackness) If the #3 terminal measures other than 5 V , inspect for the following: Open or short circuit in wiring harness Wiring harness/pin crimp is loose or disconnected.
Investigate The GND System For Hall Or Piezo-Electric Type
- Confirm that terminal sensor #5 is at 0 V. If it is at 0 V , inspect the sensor. If necessary, replace the sensor. If not, inspect for the following: Open or short circuit in wiring harness. Female terminal opening is loose causing an open or short circuit in wiring harness Coupler (pin holder) damage Pin discoloration (blackness) Wiring harness/pin crimp is loose or disconnected.
Scheme 473
Investigate The GND System For Hot Wire Type
- 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) Wiring harness/pin crimp is loose or disconnected.
Investigate The Input Signal System For Hot Wire Type
- When you get an unusual signal, measure the #1 PCM terminal voltage. If the #1 terminal voltage and the WDS or equivalent 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) Wiring 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 WDS or equivalent voltages, inspect the wiring harness for an open or short circuits. If the sensor and the WDS or equivalent voltages are the same, inspect the following points concerning the sensor connector: Female terminal opening is loose. Coupler (pin holder) damage Pin discoloration (blackness) Wiring harness/pin crimp is loose or disconnected. If there are no problems, proceed to next investigation.
Investigate The Electrical Supply System For Hot Wire Type
- 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 Pin discoloration (blackness) If the #3 terminal measures other than B+ , inspect the following: Open or short circuit in wiring harness Wiring harness/pin crimp is loose or disconnected.
Scheme 474
Investigate The Input Signal System For Thermistor Type
- When you get an unusual signal, measure the #1 PCM terminal voltage. If the #1 terminal voltage and the WDS or equivalent 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) Wiring 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 WDS or equivalent voltages, inspect the wiring harness for an open or short circuits. If the sensor and the WDS or equivalent voltages are the same, inspect the following points concerning the sensor connector: Female terminal opening is loose. Coupler (pin holder) damage Pin discoloration (blackness) Wiring harness/pin crimp is loose or disconnected. If there are no problems, proceed to next investigation.
Investigate The Gnd System For Thermistor Type
- Confirm that terminal sensor #3 is at 0 V . If it is at 0 V , inspect the sensor. If necessary, replace the sensor. If not, inspect for the following: Open circuit in wiring harness Female terminal opening is loose. Coupler (pin holder) damage Pin discoloration (blackness) Wiring harness/pin crimp is loose or disconnected.