DTC P1688: Notes

DTC P1688 DETECTION & CONDITION POSSIBLE CAUSES

DTC P1688	Metering oil pump control circuit initial check problem
DETECTION CONDITION	The PCM monitors the input signal from the metering oil pump switch when the metering oil pump stepping motor initial check is operating. If the input signal is on, the PCM determines that there is a metering oil pump control circuit initial check problem. Diagnostic support note This is a continuous monitor (CCM). The MIL illuminates if the PCM detects the above malfunction condition in the first drive cycle. PENDING CODE is available if the PCM detects the above malfunction condition. FREEZE FRAME DATA is available. The DTC is stored in the PCM memory.
POSSIBLE CAUSE	Metering oil pump malfunction Metering oil pump switch malfunction Connector or terminal malfunction Open circuit in wiring harness between main relay terminal C and metering oil pump terminal C Short to ground in wiring harness between main relay terminal C and metering oil pump terminal C Open circuit in wiring harness between main relay terminal C and metering oil pump terminal D Short to ground in wiring harness between main relay terminal C and metering oil pump terminal D Open circuit in wiring harness between metering oil pump terminal A and PCM terminal 2V Short to ground in wiring harness between metering oil pump terminal A and PCM terminal 2V Open circuit in wiring harness between metering oil pump terminal E and PCM terminal 2W Short to ground in wiring harness between metering oil pump terminal E and PCM terminal 2W Open circuit in wiring harness between metering oil pump terminal B and PCM terminal 2Y Short to ground in wiring harness between metering oil pump terminal B and PCM terminal 2Y Open circuit in wiring harness between metering oil pump terminal F and PCM terminal 2AB Short to ground in wiring harness between metering oil pump terminal F and PCM terminal 2AB Short to ground in wiring harness between metering oil pump switch terminal A and PCM terminal 2N PCM malfunction
Courtesy of MAZDA MOTORS CORP.

DTC P1688

Metering oil pump control circuit initial check problem

DETECTION CONDITION

The PCM monitors the input signal from the metering oil pump switch when the metering oil pump stepping motor initial check is operating. If the input signal is on, the PCM determines that there is a metering oil pump control circuit initial check problem.

Diagnostic support note

This is a continuous monitor (CCM).
The MIL illuminates if the PCM detects the above malfunction condition in the first drive cycle.
PENDING CODE is available if the PCM detects the above malfunction condition.
FREEZE FRAME DATA is available.
The DTC is stored in the PCM memory.

POSSIBLE CAUSE

Metering oil pump malfunction
Metering oil pump switch malfunction
Connector or terminal malfunction
Open circuit in wiring harness between main relay terminal C and metering oil pump terminal C
Short to ground in wiring harness between main relay terminal C and metering oil pump terminal C
Open circuit in wiring harness between main relay terminal C and metering oil pump terminal D
Short to ground in wiring harness between main relay terminal C and metering oil pump terminal D
Open circuit in wiring harness between metering oil pump terminal A and PCM terminal 2V
Short to ground in wiring harness between metering oil pump terminal A and PCM terminal 2V
Open circuit in wiring harness between metering oil pump terminal E and PCM terminal 2W
Short to ground in wiring harness between metering oil pump terminal E and PCM terminal 2W
Open circuit in wiring harness between metering oil pump terminal B and PCM terminal 2Y
Short to ground in wiring harness between metering oil pump terminal B and PCM terminal 2Y
Open circuit in wiring harness between metering oil pump terminal F and PCM terminal 2AB
Short to ground in wiring harness between metering oil pump terminal F and PCM terminal 2AB
Short to ground in wiring harness between metering oil pump switch terminal A and PCM terminal 2N
PCM malfunction

Courtesy of MAZDA MOTORS CORP.