Mazda RX-8 Workshop Manual page 615

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2011 - RX-8 - Engine
DTC P1687 [13B-MSP]
DTC P1687 Metering oil pump No.2 circuit high input
DETECTION
CONDITION
POSSIBLE
CAUSE
The PCM monitors the input voltage from the metering oil pump No.2 when the battery
voltage is more than 8 V and the metering oil pump No.2 control signal turned from OFF
to ON. If the input voltage is more than the specification, the PCM determines that the
metering oil pump No.2 circuit has a malfunction.
Diagnostic support note
This is a continuous monitor (other).
The MIL does not illuminate.
FREEZE FRAME DATA (Mode 2/Mode 12) is not available.
The DTC is stored in the PCM memory.
Metering oil pump No.2 connector or terminals malfunction
Metering oil pump driver connector or terminals malfunction
PCM connector or terminals malfunction
Short to ground in wiring harness between metering oil pump driver terminal F and PCM
terminal 1AA
Short to power supply in wiring harness between metering oil pump No.2 terminal A and
PCM terminal 1F
Short to power supply in wiring harness between metering oil pump driver terminal E and
PCM terminal 1F
Metering oil pump No.2 malfunction
Metering oil pump driver malfunction
Open circuit in wiring harness between metering oil pump No.2 terminal A and metering oil
pump driver terminal E
Open circuit in wiring harness between metering oil pump driver terminal F and PCM
terminal 1AA
PCM malfunction