mercury Workshop Repair Guides

Mercury Workshop Service and Repair Manuals

Initial Inspection and Diagnostic Overview|Page 8444 > < Initial Inspection and Diagnostic Overview|Page 8442
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Do the stoplamps continue to illuminate?

Yes

If the LH rear lamp continues to illuminate, REPAIR circuit CLS18 (GY/BN) for a short to voltage. TEST the system for normal operation.

If the RH rear lamp continues to illuminate, REPAIR circuit CLS19 (VT/OG) for a short to voltage. TEST the system for normal operation.

No

GO to K7.

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K3 CHECK THE STOPLAMP SWITCH

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Disconnect: Stoplamp Switch C278.

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Do the stoplamps continue to illuminate?

Yes

GO to K4 .

No

INSTALL a new stoplamp switch. REFER to Stoplamp Switch  See: Brake Light Switch/Service and Repair. TEST the system for normal operation.

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K4 CHECK THE PCM

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Disconnect: PCM C175b.

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Do the stoplamps continue to illuminate?

Yes

GO to K5.

No

GO to K6.

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K5 CHECK THE STOPLAMP SWITCH OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE

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Disconnect: SJB C2280b.

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Does the high mounted stoplamp continue to illuminate?

Yes

REPAIR circuit CCB08 (VT/WH) for a short to voltage. TEST the system for normal operation.

No

GO to K7.

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K6 CHECK FOR CORRECT PCM OPERATION

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Disconnect all the PCM connectors.

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Check for:
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corrosion

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damaged pins

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pushed-out pins

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Connect all the PCM connectors and make sure they seat correctly.

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Operate the system and verify the concern is still present.

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Is the concern still present?

Initial Inspection and Diagnostic Overview|Page 8444 > < Initial Inspection and Diagnostic Overview|Page 8442