Pinpoint Test B: The DC/AC Inverter Does Not Operate Correctly - The AC Power Point LED Indicator Is Never On
High-Voltage Converter/Inverter
Pinpoint Tests
Pinpoint Test B: The DC/AC Inverter Does Not Operate Correctly - The AC Power Point LED Indicator is Never On
Refer to Wiring Diagram Set 12 (Escape/Mariner, Escape Hybrid/Mariner Hybrid), Charging System for schematic and connector information. Diagrams By Number
Normal Operation
The DC/AC inverter receives 12 volts DC on circuits SBP04 (GN/RD) and CBP35 (YE/GY) and is grounded on circuit GD182 (BK/GY). The incoming DC power is internally converted to 60 Hz 110 volts AC power that is output to the AC power point on circuits HYA01 (OG/GN) (power) and HYA02 (OG/WH) (neutral). If a fault in the system is detected, the LED flashes 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.
The DC/AC inverter supplies 12 volts DC to the LED along circuit LYA03 (YE/VT). Ground is provided by the DC/AC inverter on circuit RYA03 (BU/BN).
This pinpoint test is intended to diagnose the following:
- Fuses
- Wiring, terminals or connectors
- DC/AC inverter
- AC power point
PINPOINT TEST B: THE DC/AC INVERTER DOES NOT OPERATE CORRECTLY - THE AC POWER POINT LED INDICATOR IS NEVER ON
NOTICE: Use the Flex Probe Kit for all test connections to prevent damage to the wiring terminals. Do not use standard multi-meter probes.
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B1 CHECK THE POWER SUPPLY CIRCUIT FOR VOLTAGE
- 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 B2.
No
CHECK the Smart Junction Box (SJB) fuse 35 (10A). If OK, REPAIR the circuit. If not OK, Refer to the Wiring Diagrams to locate the possible cause of the circuit short. TEST the system for normal operation. Diagrams By Number
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B2 CHECK THE GROUND CIRCUIT FOR AN OPEN
- Ignition OFF.
- Measure the resistance between DC/AC inverter C2293A-6, circuit GD182 (BK/GY), harness side and ground.
- Is the resistance less than 5 ohms?
Yes
GO to B3.
No
REPAIR circuit GD182 (BK/GY). TEST the system for normal operation.
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B3 CHECK THE LED CONTROL CIRCUITS FOR AN OPEN
- Disconnect: DC/AC Inverter C2293B.
- Disconnect: AC Power Point C2292.
- Measure the resistance between DC/AC inverter C2293B-9, circuit LYA03 (YE/VT), harness side and AC power point C2292-6 circuit LYA03 (YE/VT), harness side; and between DC/AC inverter C2293B-8, circuit RYA03 (BU/BN), harness side and AC power point C2292-5 circuit RYA03 (BU/BN), harness side.
- Are the resistances less than 5 ohms?
Yes
GO to B4.
No
REPAIR the affected circuit(s). TEST the system for normal operation.
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B4 CHECK THE AC POWER POINT LED
- Test the diode between AC power point C2292-5, component side and AC power point C2292-6, component side in both directions.
- Is the resistance greater than 10,000 ohms in one direction and between 10-20 ohms in the opposite direction?
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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