13E-44
8. Inspections Performed at Electronic Control Unit Connectors
• These inspections aid troubleshooting by enabling you to check whether electronic control unit signals are being
correctly transmitted via the vehicle harness and connectors.
The white-on-black numbers ( , , and so on) correspond to the similarly printed reference numbers in sec-
tion “3. Inspections based on diagnostic codes”.
8.1 Electronic control unit connector terminal layout
8.2 Inspection instructions
• Some inspections are performed with the connectors removed. Others are performed with the connectors fitted.
Observe the following caution:
CAUTION
• Do not touch any terminal except those specified for the inspection. Be particularly careful not to cause
short circuits between terminals using the tester probes.
• When the supply pump has been replaced, perform the “Initialization of supply pump unit difference
learning value” using the MUT and erase the compensation information (pump learning condition) in the
ECU.
Check item Measurement method
Resistance of intake air temperature sen-
sor
[Conditions]
• Starter switch OFF
• Disconnect connector. Perform inspection on vehicle-side connector.
[Requirements]
Terminals: E25-B26
• 0°C: 5.88 ± 0.588 kΩ
• 20°C: 2.45 ± 0.245 kΩ
• 80°C: 0.322 ± 0.0483 kΩ
Resistance of water temperature sensor
[Conditions]
• Starter switch OFF
• Disconnect connector. Perform inspection on vehicle-side connector.
[Requirements]
Terminals: E24-B26
• 20°C: 2.45 ± 0.14 kΩ
• 80°C: 0.32 kΩ (reference value)
• 110°C: 147.1 ± 2 Ω (reference value)
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TROUBLESHOOTING
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