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P1316

Injector Circuit IDM Codes Detected.

  • Mercury
  • Powertrain
  • Manufacturer code
  • Medium severity

How this code is built

P
SystemPowertrain
1
Defined byThe manufacturer
3
AreaIgnition system or misfire
16
FaultThe specific fault in that area

What it means

On Mercury, P1316 means the powertrain control module has detected a fault in the injector circuit through the Injector Driver Module (IDM) or its related injector driver circuits. This is a Ford-group definition, so it relates to the IDM reporting injector circuit faults, not spark plug voltage or misfire rate. The module normally stores additional injector or IDM-related codes alongside it, and those codes show which injector or bank is involved. Which engines are fitted with an IDM depends on the model and year.

Symptoms

  • Engine misfire or rough running, particularly at idle
  • Hesitation or lack of power under load
  • Hard starting or extended cranking
  • Engine stalling or cutting out intermittently
  • Poor fuel economy
  • Malfunction indicator lamp on

Possible causes

  • Damaged, chafed or corroded wiring or connectors in an injector circuit or the IDM harnesslikely
  • Faulty fuel injector with a shorted or open coil, or abnormal resistancelikely
  • Poor power or earth supply to the IDM or injector circuits, including blown fuses or relay faultspossible
  • Failed Injector Driver Modulepossible
  • Low or unstable battery or charging system voltagepossible
  • Fault within the powertrain control module driver circuitsrare

How to diagnose

  1. Read all stored and pending codes and note any other injector, misfire or IDM codes, as these show where to look
  2. Review freeze frame data for engine speed, load, temperature and voltage when the code set
  3. Check battery condition and charging voltage, as low or unstable voltage can upset injector drive circuits
  4. Visually inspect the injector connectors, the IDM connector and the related harness for chafing, heat damage, corrosion, pushed-out pins or water ingress
  5. Check the fuses, relays and power and earth feeds to the IDM and injectors against the wiring diagram for that model and engine
  6. Measure injector coil resistance and compare with the specification for the engine
  7. Check the injector driver signals with a suitable scope or meter while cranking or running, following the model-specific procedure
  8. Wiggle test the harness with the engine running to find intermittent faults

How to fix

  • Repair or replace damaged wiring and connectors, and clean or re-pin terminals as needed
  • Replace any injector that is out of resistance specification or shows a faulty drive pattern
  • Restore correct power, earth and fuse or relay supply to the IDM and injector circuits
  • Replace the Injector Driver Module once the wiring, supply and injectors have been proven good
  • Correct battery or charging faults, then clear the codes and confirm they do not return

Can I keep driving?

Medium severity

Short, careful driving is usually possible, but the fault can cause misfires, stalling and poor running. Get it checked soon, and avoid driving if the engine runs very roughly or stalls, since unburnt fuel can damage the catalytic converter.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.

This code for other makes

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