P1364

Code

CHRYSLER P — Powertrain

IC Cylinder 4 Not Toggling After Enable

Brand: CHRYSLER

Type: P — Powertrain

Views: UK: 34 EN: 49 RU: 39

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Page language: EN

Failed ignition coil, igniter or injector (open/shorted internal driver)
Open, short to battery, or short to ground in the driver wiring between PCM and the coil/igniter or injector
Poor or corroded connector or pin at coil/igniter/injector or at the PCM
PCM/ECM driver transistor failure or internal fault
Low battery/poor battery voltage or charging system problem preventing proper driver operation
PCM software bug or blown fuse/power/ground to PCM

Retrieve freeze frame and stored/ pending codes; note vehicle conditions (rpm, load, temp)
Verify battery voltage and charging system health (12.4–14.5 V with engine running)
Use a scan tool to command cylinder 4 enable/disable (bidirectional control) and observe symptom/response
Back-probe coil/igniter or injector connector while commanding output; check for voltage switching
Inspect connectors and wiring for corrosion, bent pins, chafing, or damage
Swap coil/igniter or injector with another cylinder (if applicable) and see if the code follows the component

Expected driver output: toggling between near 0 V (ground) and battery voltage (~12 V) on a low-side or high-side driver depending on design
Primary coil/driver pulse width (dwell) typically a few milliseconds at idle and increases with RPM; frequency equals ignition events per cylinder
When disabled: no pulses / steady inactive voltage (depends on circuit design)
Primary coil resistance: manufacturer spec (typical values vary by coil type; consult vehicle service data)
Injector control (if applicable): PWM duty cycle or pulsed ground; expect pulses when commanded by PCM

Confirm code presence and review freeze frame data. Clear codes and attempt to reproduce while monitoring live data.
Verify battery voltage and grounds. Poor voltage can prevent driver switching—repair battery/charging issues first.
Use scan tool to command cylinder 4 ON/OFF. While commanding, backprobe the coil/igniter or injector connector and observe voltage. If there is switching, problem may be downstream; if no switching, proceed.
Inspect connector for corrosion, bent pins, water intrusion. Wiggle test harness while commanding to check for intermittent connection.
Measure continuity between PCM driver pin and the coil/igniter or injector connector pin. Check for short to battery or ground. Repair any wiring faults.
Swap the suspect coil/igniter or injector with a known-good cylinder. If the fault moves with the part, replace the component. If the fault remains on cylinder 4, suspect wiring or PCM.
Use an oscilloscope to compare the primary driver waveform of cylinder 4 to a good cylinder. Look for absent pulses, clipped/flat waveform, or abnormal dwell time.
If wiring and module/component tests are good but driver never toggles, consider PCM output driver failure. Before replacing PCM, verify power, ground, and related fuses/relays and check for any available TSBs or software updates.
After repairs, clear codes and road-test. Confirm no return of P1364 and verify misfire/fuel trim/live data normal.

Bad ignition coil or igniter module on cylinder 4
Damaged harness (chafed wire, pinched, rodent damage) on cylinder 4 control circuit
Corroded/loose connector at coil/igniter or PCM
Failed output driver inside PCM (intermittent or dead)
Low supply or poor ground to PCM or ignition module

⚠️ Status

P1364 — Cylinder 4 control output commanded by PCM but output did not toggle after enable; check coil/igniter/injector, wiring and PCM driver.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.5-3.0 hours

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P1364 — IC Cylinder 4 Not Toggling After Enable