3.
Is the problem found?
 | ▶ Repair the trouble causing part and go to "Verification of Vehicle Repair". |
 | ▶ Go to "Power Circuit Inspection". |
Electrical systems consist of a lot of harness and connectors, poor connection of terminals can cause various problems and damge of component.
Perform checking procedure as follows.
Check damage of harness and terminals : Check terminals for contact resistance, corrosion and deformation.
Check connecting condition of ECM and component connector : Check terminal seperation, damage of locking device and connecting condition between terminal and wiring.
Disconnect the pin which requires checking at male connector and insert it to the terminal at female connector for checking connecting condition. ( after checking, reconnect the pin at correct position. )
Is the problem found?
| ▶ Repair the trouble causing part and go to "Verification of Vehicle Repair". |
| ▶ Go to "Power Circuit Inspection". |
Check power circuit voltage
IG KEY "OFF", ENGINE "OFF".
Disconnect MAFS connector.
IG KEY "ON".
Measure the voltage between IG power terminal of MAFS harness connector and chassis ground.
Measure the voltage between power terminal of MAFS harness connector and chassis ground.
Specification : 4.8V~5.1V ( Sensor power )
11.5V~13.0V ( IG Power )
Is the measured voltage within the specification?
| ▶ Go to "Signal Circuit Inspection". |
| ▶ When output voltage is not detected at IG power terminal : ☞ Repair open in 'SNSR.2 FUSE 10A' in E/R junction box and related circuit and go to "Verification of Vehicle Repair". ▶ When output voltage is not detected at power terminal : ☞ Repair open between power terminal of MAFS connector and sensor power terminal of ECM connector (CUD-A), and go to "Verification of Vehicle Repair". |
Check signal circuit voltage
IG KEY "OFF", ENGINE "OFF".
Disconnect MAFS connector and ECM connector.
IG KEY "ON".
Measure the voltage between signal terminal of IATS harness connector and chassis ground.
Measure the voltage between signal terminal of MAFS harenss connector and chassis ground.
Specification : Terminal 3 : 4.8V~5.1V (IATS signal )
Terminal 5 : 4.8V~5.1V (MAFS signal )
Is the measured voltage within the specification?
| ▶ Go to "Ground Circuit Inspection". |
| ▶ Repair short to battery in signal circuit and go to "Verification of Vehicle Repair". |
IG KEY "OFF", ENGINE "OFF".
Disconnect MAFS connector.
IG KEY "ON".
Measure the voltage between power terminal of MAFS harness connector and chassis ground. [ TEST "A" ]
Measure the voltage between power terminal of MAFS harness connector and and signal terminal of MAFS harness connectorter. [ TEST "B" ]
Specification : [TEST "A"] Voltage - [TEST "B"] Voltage = below 200mV
Is the measured voltage within the specification?
| ▶ Go to "Component Inspection". |
| ▶ When "B" voltage is not detected : Repair open in ground circuit and go to "Verification of Vehicle Repair". ▶ When the voltage difference between "A" and "B" is above 200mV : Eliminate the causes of excessive resistance and go to "Verification of Vehicle Repair". |
