Pinpoint Test L: The DC/AC Inverter Does Not Operate Correctly - The AC Power Point LED Indicator is Never On
High-Voltage Converter/Inverter
Pinpoint Test L: The DC/AC Inverter Does Not Operate Correctly - The AC Power Point LED Indicator is Never On
Refer to Wiring Diagram Set 12 (Fusion/Milan/MKZ, Fusion Hybrid, Milan Hybrid, MKZ Hybrid), Charging System for schematic and connector information. Diagrams By Number
Normal Operation
The DC/AC inverter receives 12 volts DC at C2293A-1 and C2293A-3 and is grounded at C2293A-6. The incoming DC power is internally converted to 60 Hz, 110 volt AC power that is output to the AC power point from C2293B-1 (power) and C2293B-5 (neutral). If a fault in the system is detected, the LED flashes or is off when the key is in the ON position. The LED continuously illuminates if the system is operating correctly when the key is in the ON position.
This pinpoint test is intended to diagnose the following:
- Fuses
- Wiring, terminals or connectors
- DC/AC inverter
- AC power point
PINPOINT TEST L: THE DC/AC INVERTER DOES NOT OPERATE CORRECTLY - THE AC POWER POINT LED INDICATOR IS NEVER ON
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
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L1 CHECK DC/AC INVERTER VOLTAGE CIRCUIT
- Ignition OFF.
- Disconnect: DC/AC Inverter C2293A.
- Ignition ON.
- Measure the voltage between DC/AC inverter C2293A-3, circuit CBP35 (YE/GY), harness side and ground.
- Is the voltage greater than 10 volts?
Yes
GO to L2.
No
VERIFY Smart Junction Box (SJB) fuse 35 (10A). If OK, REPAIR circuit CBP35 (YE/GY). If not OK, Refer to the Wiring Diagrams to identify the possible causes of the circuit short. TEST the system for normal operation. Diagrams By Number
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L2 CHECK DC/AC INVERTER GROUND CIRCUIT
- Ignition OFF.
- Measure the resistance between DC/AC inverter C2293A-6, circuit GD139 (BK/YE), harness side and ground.
- Is the resistance less than 5 ohms?
Yes
GO to L3.
No
REPAIR circuit GD139 (BK/YE). TEST the system for normal operation.
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L3 CHECK AC POWER POINT LED INDICATOR CIRCUITS FOR AN OPEN
- Disconnect: DC/AC Inverter C2293B.
- Disconnect: AC Power Point C2292.
- Measure the resistance between DC/AC inverter C2293B, harness side and AC power point C2292 as follows:
- Are the resistances less than 5 ohms?
Yes
GO to L4.
No
REPAIR the affected circuit(s). TEST the system for normal operation.
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L4 CHECK THE AC POWER POINT LED
- Using the digital multimeter diode check function, test the diode between AC power point C2292, pin-5 and pin-6, component side in both directions.
- Is the diode OK?
Yes
INSTALL a new DC/AC inverter. REFER to Direct Current/Alternating Current (DC/AC) Inverter Direct Current/Alternating Current (DC/AC) Inverter. TEST the system for normal operation.
No
INSTALL a new AC power point. REFER to Alternating Current (AC) Powerpoint Alternating Current (AC) Powerpoint. TEST the system for normal operation.
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