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Home / DTC / P1212 — Injector Control Pressure Not Detected During Crank

P1212 — Injector Control Pressure Not Detected During Crank

Detailed page for trouble code P1212.

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Code

P1212

MERCURY P — Powertrain

Injector Control Pressure Not Detected During Crank

Brand: MERCURY
Type: P — Powertrain
AI status
Completed
ready
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Page language: EN

Causes

  • Faulty or failed Injector Control Pressure (ICP) sensor
  • Open, shorted or corroded connector/wiring to ICP sensor or ICP control valve
  • Low battery/weak starter voltage during crank
  • Failed ICP control solenoid/valve or its supply (mechanical/electrical)
  • Insufficient system pressure (fuel or high‑pressure oil, depending on engine design)
  • Blocked pressure passages, clogged filter or failed pressure pump

Symptoms

  • Engine cranks but fails to start or cranks longer than normal
  • Malfunction Indicator Lamp (MIL) illuminated
  • No or reduced injector operation/poor fuel delivery during crank
  • Possible rough or labored cranking
  • Stored DTC P1212 and possibly related fuel/injector codes

What to check

  • Read/record freeze frame and live data with a scan tool; verify ICP reading during crank and note battery voltage
  • Visually inspect ICP sensor connector and wiring for corrosion, damage or loose pins
  • Check battery state-of-charge and cranking voltage at the battery and ECM
  • Check for related stored codes (fuel rail pressure, injector circuits, ECM faults)
  • Backprobe ICP sensor connector to verify reference voltage, ground and signal while cranking
  • Measure fuel pressure or high‑pressure oil (depending on engine) at the rail/port to confirm system pressure

Signal parameters

  • Reference supply typically 5 V from ECM (verify exact value in service manual)
  • Sensor signal expected to vary with pressure (typical sensor output ~0.2–4.8 V depending on pressure range; consult OEM spec)
  • Good ground continuity between sensor ground terminal and ECM ground
  • During crank the ICP value should rise to the manufacturer’s minimum threshold within seconds (refer to service manual for exact kPa/psi limits)
  • No signal (open/0 V) or fixed/erratic voltage indicates wiring or sensor fault

Diagnostic algorithm

  1. Connect a capable scan tool. Read and record P1212 and any additional codes and freeze frame data. Note battery voltage during freeze frame.
  2. Attempt a crank while monitoring live data: observe ICP sensor voltage/pressure reading and battery voltage. If ICP never appears or is erratic, continue.
  3. Visually inspect wiring and connector at the ICP sensor and ICP control valve. Repair any damage or corrosion and reconnect.
  4. With ignition on (engine off) backprobe the sensor: verify proper reference voltage (~5 V), good ground and that the signal wire shows a sensible voltage. Have an assistant crank while you observe signal behavior.
  5. If reference or ground is missing, trace and repair open/short to ECM. If signal is fixed or out of range, replace sensor or repair wiring.
  6. If sensor signals appear correct but pressure is not achieved, check the ICP control solenoid/actuator operation and its supply/current. Verify system pump (fuel or high‑pressure oil pump) and pressure supply, and inspect filters/strainers for restriction.
  7. Test continuity/resistance of sensor and solenoid circuits per service manual values. Replace any component that fails specification.
  8. After repairs, clear codes and perform a crank/run verification. Re-scan for codes and confirm normal ICP response and engine starting behavior.

Likely causes

  • Corroded or disconnected ICP sensor connector
  • Bad ICP sensor
  • Failed ICP control solenoid (stuck closed/open or electrically open)
  • Low battery or poor battery/starting system voltage during cranking
  • Open/short in sensor reference or signal circuit to ECM

Fault status

⚠️ Status
P1212 - Injector Control Pressure Not Detected During Crank. ECM did not detect the expected ICP signal while cranking; check ICP sensor, wiring, power/ground, and system pressure.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 3.0 hours

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296

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