3.
Measure voltage value between terminal "B1" of A/C control unit and chassis ground.
a.
Specification : 5V
Engine "ON".
Disconnect intake actuator.
Measure voltage value between terminal "B1" of A/C control unit and chassis ground.
Specification : 5V
Is the measured voltage within specifications?
YES
Go to "Check intake actuator" procedure.
NO
Substitute with a known-good A/C Control Unit and check for proper operation.
If the problem is corrected, replace A/C Control Unit and then go to "Verification of Vehicle Repair" procedure.
Check actuator motor
Ignition "OFF".
Disconnect intake actuator.
Connect (+) terminal of battery to terminal 3 of intake actuator and (-) terminal to terminal 4.
Verify that the actuator operates to the REC position.
Verify that the temperature actuator operates to the FRE position with reverse connecting.( (+) to 4 and (-) to 3)
Dose the actuator work properly?
YES
Go to "Check potentiometer" procedure.
NO
Substitute with a known-good actuator and check for proper operation. If the problem is corrected, replace actuator and then go to "Verification of Vehicle Repair" procedure.
Check actuator potentiometer
Ignition "ON".
Connect intake actuator.
Measure voltage between terminal "5" and "6" of intake actuator while operating the intake switch.
Specification : Refer the specifications in fig3)
Door position | Voltage | Error Detecting Condition |
FRE | 0.3±0.15V | Undervoltage : 0.08V or less |
REC | 4.7±0.15V | Overvoltage : 4.9V or more |
Fig3) Specifications : Voltage value of intake potentiometer as a function of intake door position.
Is the measured voltage within specifications in fig3)?
YES
Check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and then go to "Verification of Vehicle Repair" procedure.
NO
Substitute with a known-good actuator and check for proper operation. If the problem is corrected, replace actuator and then go to "Verification of Vehicle Repair" procedure.
