What Does P1687 Mean?
A third variant of metering oil pump stepping motor circuit malfunction detection. This typically indicates a comprehensive failure affecting multiple phases or a complete motor failure in rotary engine oil metering systems.
Common Causes
40%
Complete stepping motor failure in metering oil pump
25%
Multiple wire breaks or harness damage to MOP
20%
Water intrusion causing short circuits in motor windings
10%
ECM multiple driver circuit failure
5%
Mechanical seizure of MOP preventing motor movement
Diagnostic Steps
1
Step 1: Attempt manual rotation of MOP shaft to check for mechanical binding or seizure
2
Step 2: Disconnect MOP motor and check all four phase winding resistances (should be equal and within spec)
3
Step 3: Check for short circuits between phases and to ground (should be infinite resistance)
4
Step 4: Inspect MOP assembly for physical damage, oil contamination in connector, or water intrusion
5
Step 5: Verify ECM power and ground circuits are within specification before condemning ECM
Estimated Repair Cost
$350 - $1,500
Parts + labor, varies by vehicle and location
A third variant of metering oil pump stepping motor circuit malfunction detection. This typically indicates a comprehensive failure affecting multiple phases or a complete motor failure in rotary engine oil metering systems.
The most common cause of P1687 (Metering Oil Pump Stepping Motor Circuit Malfunction) is: Complete stepping motor failure in metering oil pump
Typical repair costs for P1687 range from $350 to $1,500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Critical lubrication failure will destroy rotary engine internals rapidly. Vehicle should not be driven except to a repair facility.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1687 to identify the root cause.
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Quick Info
Category
Powertrain
System
Rotary Engine Lubrication System
Difficulty
Type
Manufacturer
Recommended Tools
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