Code
P1113
CADILLAC
P — Powertrain
Intake Resonance Switchover Valve Circuit
Views:
UK: 21
EN: 33
RU: 28
AI status
Completed
Completed
100%
Causes
- Open or short in IRSV wiring harness
- Poor or corroded connector/terminal at the valve
- Failed IRSV solenoid or internal coil fault
- Blown fuse or faulty relay supplying circuit
- PCM driver fault or internal short
- Mechanical binding or seizure of the IRSV mechanism
Symptoms
- Illuminated check engine / SERVICE ENGINE SOON light
- Reduced engine performance or torque at specific rpm ranges
- Rough running or hesitation when resonance circuit should switch
- Audible clicking missing or continuous click from IRSV area
- Possible reduced fuel economy
What to check
- Read freeze frame and live data with a scan tool; attempt to command IRSV ON/OFF while monitoring status and voltage
- Visual inspection of IRSV connector and harness for damage, corrosion, or loose pins
- Check related fuses and relays for continuity and correct operation
- Backprobe harness to measure supply voltage and control signal at the IRSV connector
- Measure IRSV coil resistance with DVM (unplugged)
- Inspect intake resonator passages and actuator for mechanical binding or foreign debris
Signal parameters
- Battery supply at IRSV power pin with ignition ON: ~11–14 V
- Control/drive pin (PCM switched) expected: near 0 V (ground) when commanded ON if low-side drive; near battery voltage when OFF (or a PWM signal depending on model)
- Typical IRSV coil resistance (cold): approximately 15–40 ohms (manufacturer spec may vary) — compare to service data
- When commanded ON using scan tool, audible click and change in solenoid current or expected duty cycle if PWM is used
Diagnostic algorithm
- Retrieve freeze frame and all related codes. Confirm P1113 is current and note any intermittent status.
- Visually inspect IRSV, connector, and wiring for damage, corrosion, or pin push-out. Repair any obvious faults.
- With ignition ON (engine OFF), backprobe the connector: verify battery voltage on power feed and check control pin voltage while commanding IRSV ON/OFF with scan tool. Document voltages.
- Unplug IRSV and measure coil resistance with a DVM. Compare to specification. An open or very high resistance indicates a bad solenoid.
- Check for short to ground or short to power on the control circuit using resistance or voltage checks. Wiggle test harness to reproduce intermittent faults.
- If wiring and solenoid are good but the PCM does not command or control pin stays fixed, inspect fuses/relays and consider PCM driver fault. Verify ground integrity and related grounds.
- If electrical tests pass, apply battery voltage briefly to the solenoid (bench test) to verify mechanical movement (observe valve operation). Use caution to avoid damage.
- Repair or replace the IRSV, harness, or connector as indicated. Clear codes and perform drive cycle; verify fault does not return and system operates as commanded.
Likely causes
- Disconnected or corroded connector at IRSV
- Broken or chafed wiring causing intermittent open/short to power or ground
- IRSV coil out of specification (open or high resistance)
- Faulty fuse or power feed to IRSV
- PCM not commanding or not switching ground (driver failure)
Fault status
Status
Intake Resonance Switchover Valve Circuit malfunction detected by PCM.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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