P1691 – All makes

Code : P1691
Make : All makes
Description : P1691 Fuel Injection Pump Controller Calibration Error
Possible causes :
– AC Noise Across Fuel Transfer Pump
– Other DTCs Present
– Wiring & Connectors
– Fuel Injection Pump Static Timing
– Fuel Sync Signal Circuit Open
– Fuel Sync Signal Circuit Short To Ground
– Engine Control Module (ECM)
Solutions :
– Carry out a Reset via CarDiag
– Choose a better quality fuel
– Check that the tank cap is securely closed
– Check the oil level and add more if it is lower than MAX
– Restart an Automatic diagnostic via CarDiag
– If the fault persists, you can check the “Possible causes” listed above : visually inspect (by yourself (tutorials to come) or by a professional) the wiring harness and the associated connectors, check for damaged components, and look for broken, bent, pushed, or corroded connector pins.

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