P1693

Code

Other P — Powertrain

Turbo Charge Control Circuit Malfunction

Brand: Other

Type: P — Powertrain

Views: UK: 26 EN: 109 RU: 101

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Page language: EN

Causes

Open or shorted wiring between ECM and turbo boost control solenoid/actuator
Corroded, loose or damaged connector at solenoid, actuator or ECM
Failed boost control solenoid (wastegate/vacuum solenoid) or stuck actuator
Faulty turbocharger actuator or internal turbo mechanical failure
Faulty boost/pressure sensor (MAP, MAP/boost sensor) giving incorrect feedback
Blown fuse or failed power/ground supply to solenoid or ECM output

Symptoms

Check Engine Light / MIL illuminated
Reduced engine power or limp-home mode
Poor or delayed turbo spool and reduced acceleration
Intermittent or sustained overboost or underboost condition
Unusual turbo noises or visible boost pressure fluctuations
Reduced fuel economy

What to check

Read freeze frame and all stored DTCs with a scan tool; record live data of boost, commanded duty and actuator position
Visual inspection of turbo, solenoid, actuator, vacuum/pressure hoses and connectors for damage, contamination, or loose fittings
Check fuse(s) and relays supplying power to boost control circuits
Backprobe connector at boost control solenoid and ECM to verify power, ground and control signal
Measure solenoid coil resistance and compare to expected range
Check for vacuum/boost leaks (smoke test or pressure test)

Signal parameters

Control signal: typically a PWM duty-cycle command from ECM (0–100% duty). Frequency commonly in the tens to low hundreds of Hz (vehicle-specific).
Supply voltage to solenoid: battery voltage when key on (approx. 12 V) or switched 12 V feed depending on design.
Ground: low-impedance ground (near 0 Ω to chassis).
Solenoid coil resistance: commonly tens of ohms (example 10–60 Ω depending on design) — consult vehicle-specific spec before replacement.
Boost/MAP sensor output: typical MAP/boost sensors produce approx. 0.5–4.5 V across their pressure range; verify against vehicle spec.

Diagnostic algorithm

Connect a professional scan tool, read freeze frame data and all stored/active DTCs. Note current boost, commanded duty and any related codes (MAP, turbo actuator, powertrain).
Perform a visual inspection: check wiring harness, connectors, solenoid, actuator, vacuum/boost hoses and mounting for damage, corrosion or contamination.
With ignition ON (engine off), verify power and ground at the boost control solenoid connector. Check fuses/relays if no power.
Measure solenoid coil resistance (unplug solenoid). Compare to manufacturer spec. If open or shorted, replace solenoid.
Backprobe control pin with engine running while monitoring scan tool. Verify ECM is commanding the solenoid (PWM duty changes with load).
Apply a known-good 12 V (through an inline resistor or fused jumper) to the solenoid ground/power as required to confirm mechanical actuation of the actuator and observe boost response. Do not short circuits; follow safety procedures.
Pressure/ vacuum test actuator and hoses for leaks. Manually operate actuator (where serviceable) and confirm wastegate movement and correct action.
Check boost/MAP sensor readings against expected values while applying load. Replace sensor if readings are inconsistent with actual boost measured.
If wiring and components test good but code persists, perform continuity/resistance checks between solenoid connector and ECM pin to rule out intermittent or shorted wiring. Repair any wiring faults.
Consider ECU output driver failure only after verifying all wiring, connectors and components. If ECM replacement is necessary, reprogram/flash as required and confirm repair with road test and re-scan.

Likely causes

Damaged harness or pin corrosion at solenoid/actuator connector
Failed boost control solenoid coil (open or shorted)
Vacuum/boost hose leak between solenoid and actuator
Intermittent open/short in control signal (PWM) or ground
Failed boost pressure sensor producing invalid feedback

Fault status

⚠️ Status

P1693 — Turbo Charge Control Circuit Malfunction: ECM detected a fault in the turbo/boost control circuit (solenoid/actuator or control wiring). Inspect wiring, connectors, boost control solenoid and actuator; verify ECM control signal and sensor feedback before replacing components.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0 - 4.0 hours