Mariner 4WD L4-2.5L (2010)
GO to D18.
No
INSTALL a new DC/DC converter. REFER to Direct Current/Direct Current (DC/DC) Converter . CLEAR the DTCs. REPEAT the self-test.
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D18 CHECK THE DC/DC CONVERTER USING THE PCM DC/DC CONVERTER ENABLE (DCE) PID
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Ignition OFF.
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Connect: DC/DC Converter C1457A.
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Ignition ON.
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Enter the following diagnostic mode on the scan tool: DataLogger - PCM.
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Measure the battery voltage.
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While monitoring the measured battery voltage, command the PCM DCE active command on and off.
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Does the battery voltage increase and decrease in accordance with the cycling of the active command?
Yes
CLEAR the DTCs. GO to D19.
No
GO to D26.
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D19 CHECK THE DC/DC CONVERTER FAULT CIRCUIT FOR AN OPEN
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Ignition OFF.
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Disconnect: DC/DC Converter C1457A (if not previously disconnected).
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Disconnect: PCM C175B.
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Measure the resistance between DC/DC converter C1457A-6, circuit CYD04 (BU/OG), harness side, and PCM C175B-8, circuit CYD04
(BU/OG), harness side.
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Is the resistance less than 5 ohms?
Yes
GO to D20.
No
REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
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D20 CHECK THE DC/DC CONVERTER FAULT CIRCUIT FOR A SHORT TO VOLTAGE