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Home / DTC / P1334 — #4 MISFIRE CIRCUIT - OPEN

P1334 — #4 MISFIRE CIRCUIT - OPEN

Detailed page for trouble code P1334.

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Code

P1334

DAEWOO P — Powertrain

#4 MISFIRE CIRCUIT - OPEN

Brand: DAEWOO
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or broken wiring in coil/igniter primary circuit for cylinder 4
  • Poor or corroded connector or pin at the coil/igniter or wiring harness
  • Failed ignition coil or coil-on-plug assembly for cylinder 4
  • Faulty ignition driver (igniter) or ignition module
  • Power supply (fused source) or ground open to the coil bank
  • Intermittent/loose ECM/PCM connector or internal driver fault in ECM/PCM

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Rough idle or vibration at idle
  • Reduced engine power or hesitation under load
  • Single-cylinder misfire count for cylinder 4 in scan data
  • Poor fuel economy and possible failed emissions test
  • Occasional cranking/no-start if circuit is fully open

What to check

  • Read freeze frame and live data — confirm misfire count for cylinder 4
  • Visual inspection of coil/igniter, connector, wiring harness and pins for damage/corrosion
  • Check for battery voltage at coil power feed with ignition ON
  • Check continuity and resistance of coil primary and secondary circuits
  • Swap coil (or coil/igniter) from cylinder 4 with another cylinder and rerun to see if fault follows
  • Backprobe coil connector while cranking with a scope or lab meter to verify driver pulses

Signal parameters

  • Expected coil primary resistance: typically ~0.5–3.0 ohms (manufacturer-specific)
  • Expected coil secondary resistance: typically ~3k–15k ohms (manufacturer-specific)
  • Coil power feed: battery voltage (~12 V) with ignition ON (should remain present)
  • Coil driver signal: pulsed 0–12 V (or low-side switching to ground) while cranking/running — visible on a scope as dwell pulses
  • Open-circuit indication: no driver pulses and/or infinite/open continuity on primary circuit

Diagnostic algorithm

  1. Connect a scan tool, read DTCs and freeze-frame; confirm P1334 and verify misfire logs show cylinder 4.
  2. Perform a careful visual inspection of the #4 coil/igniter, plug and wiring harness. Look for broken wires, rubbed-through insulation, melted connectors or corrosion.
  3. With ignition OFF, disconnect the coil connector and check terminal condition and continuity to the ECM connector. Wiggle the harness while checking for intermittent opens.
  4. Check for battery voltage on the coil power feed with ignition ON; verify good engine/chassis ground present at coil bracket/harness ground.
  5. Measure coil primary and secondary resistance against manufacturer specs; if out of range, replace the coil.
  6. Swap the #4 coil (or coil-on-plug) with a known-good coil from another cylinder. Clear codes and run engine; if misfire/DTC moves to the other cylinder, the coil is faulty.
  7. If coil appears good, backprobe the coil primary while cranking or running with a scope or digital meter to verify driver pulses from the PCM. No pulses indicates open or driver fault.
  8. If driver pulses are absent but wiring continuity from PCM to coil is OK, suspect PCM/ignition module driver fault. Confirm wiring and grounds before replacing control module.
  9. Repair any damaged wiring, connectors, or replace faulty coil/igniter. Clear codes and perform a test drive to confirm repair.
  10. If intermittent, perform wiggle tests and road test with data logging to reproduce the fault before replacing components.

Likely causes

  • Damaged connector or wiring harness to cylinder 4 coil
  • Failed coil or integrated igniter on cylinder 4
  • Blown fuse or open power feed to ignition coils
  • Poor ground at engine/coil bracket or harness ground
  • ECM/PCM driver fault (less common)

Fault status

⚠️ Status
Cylinder 4 ignition/misfire circuit open. PCM detected loss of ignition driver/continuity for cylinder 4 causing a misfire. Check coil, connector, wiring, power/ground and PCM driver.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours
Repair manuals

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Code

P1334

LAND ROVER P — Powertrain

performance of the exhaust gas recirculation throttle stop minimum stop performance

Brand: LAND ROVER
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or broken wiring in coil/igniter primary circuit for cylinder 4
  • Poor or corroded connector or pin at the coil/igniter or wiring harness
  • Failed ignition coil or coil-on-plug assembly for cylinder 4
  • Faulty ignition driver (igniter) or ignition module
  • Power supply (fused source) or ground open to the coil bank
  • Intermittent/loose ECM/PCM connector or internal driver fault in ECM/PCM

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Rough idle or vibration at idle
  • Reduced engine power or hesitation under load
  • Single-cylinder misfire count for cylinder 4 in scan data
  • Poor fuel economy and possible failed emissions test
  • Occasional cranking/no-start if circuit is fully open

What to check

  • Read freeze frame and live data — confirm misfire count for cylinder 4
  • Visual inspection of coil/igniter, connector, wiring harness and pins for damage/corrosion
  • Check for battery voltage at coil power feed with ignition ON
  • Check continuity and resistance of coil primary and secondary circuits
  • Swap coil (or coil/igniter) from cylinder 4 with another cylinder and rerun to see if fault follows
  • Backprobe coil connector while cranking with a scope or lab meter to verify driver pulses

Signal parameters

  • Expected coil primary resistance: typically ~0.5–3.0 ohms (manufacturer-specific)
  • Expected coil secondary resistance: typically ~3k–15k ohms (manufacturer-specific)
  • Coil power feed: battery voltage (~12 V) with ignition ON (should remain present)
  • Coil driver signal: pulsed 0–12 V (or low-side switching to ground) while cranking/running — visible on a scope as dwell pulses
  • Open-circuit indication: no driver pulses and/or infinite/open continuity on primary circuit

Diagnostic algorithm

  1. Connect a scan tool, read DTCs and freeze-frame; confirm P1334 and verify misfire logs show cylinder 4.
  2. Perform a careful visual inspection of the #4 coil/igniter, plug and wiring harness. Look for broken wires, rubbed-through insulation, melted connectors or corrosion.
  3. With ignition OFF, disconnect the coil connector and check terminal condition and continuity to the ECM connector. Wiggle the harness while checking for intermittent opens.
  4. Check for battery voltage on the coil power feed with ignition ON; verify good engine/chassis ground present at coil bracket/harness ground.
  5. Measure coil primary and secondary resistance against manufacturer specs; if out of range, replace the coil.
  6. Swap the #4 coil (or coil-on-plug) with a known-good coil from another cylinder. Clear codes and run engine; if misfire/DTC moves to the other cylinder, the coil is faulty.
  7. If coil appears good, backprobe the coil primary while cranking or running with a scope or digital meter to verify driver pulses from the PCM. No pulses indicates open or driver fault.
  8. If driver pulses are absent but wiring continuity from PCM to coil is OK, suspect PCM/ignition module driver fault. Confirm wiring and grounds before replacing control module.
  9. Repair any damaged wiring, connectors, or replace faulty coil/igniter. Clear codes and perform a test drive to confirm repair.
  10. If intermittent, perform wiggle tests and road test with data logging to reproduce the fault before replacing components.

Likely causes

  • Damaged connector or wiring harness to cylinder 4 coil
  • Failed coil or integrated igniter on cylinder 4
  • Blown fuse or open power feed to ignition coils
  • Poor ground at engine/coil bracket or harness ground
  • ECM/PCM driver fault (less common)

Fault status

⚠️ Status
Cylinder 4 ignition/misfire circuit open. PCM detected loss of ignition driver/continuity for cylinder 4 causing a misfire. Check coil, connector, wiring, power/ground and PCM driver.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours
320

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LAND ROVER

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Code

P1334

SAAB P — Powertrain

Combustion Detection Cyl. 3 + 4. Open Circuit / Short to B +.

Brand: SAAB
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or broken wiring in coil/igniter primary circuit for cylinder 4
  • Poor or corroded connector or pin at the coil/igniter or wiring harness
  • Failed ignition coil or coil-on-plug assembly for cylinder 4
  • Faulty ignition driver (igniter) or ignition module
  • Power supply (fused source) or ground open to the coil bank
  • Intermittent/loose ECM/PCM connector or internal driver fault in ECM/PCM

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Rough idle or vibration at idle
  • Reduced engine power or hesitation under load
  • Single-cylinder misfire count for cylinder 4 in scan data
  • Poor fuel economy and possible failed emissions test
  • Occasional cranking/no-start if circuit is fully open

What to check

  • Read freeze frame and live data — confirm misfire count for cylinder 4
  • Visual inspection of coil/igniter, connector, wiring harness and pins for damage/corrosion
  • Check for battery voltage at coil power feed with ignition ON
  • Check continuity and resistance of coil primary and secondary circuits
  • Swap coil (or coil/igniter) from cylinder 4 with another cylinder and rerun to see if fault follows
  • Backprobe coil connector while cranking with a scope or lab meter to verify driver pulses

Signal parameters

  • Expected coil primary resistance: typically ~0.5–3.0 ohms (manufacturer-specific)
  • Expected coil secondary resistance: typically ~3k–15k ohms (manufacturer-specific)
  • Coil power feed: battery voltage (~12 V) with ignition ON (should remain present)
  • Coil driver signal: pulsed 0–12 V (or low-side switching to ground) while cranking/running — visible on a scope as dwell pulses
  • Open-circuit indication: no driver pulses and/or infinite/open continuity on primary circuit

Diagnostic algorithm

  1. Connect a scan tool, read DTCs and freeze-frame; confirm P1334 and verify misfire logs show cylinder 4.
  2. Perform a careful visual inspection of the #4 coil/igniter, plug and wiring harness. Look for broken wires, rubbed-through insulation, melted connectors or corrosion.
  3. With ignition OFF, disconnect the coil connector and check terminal condition and continuity to the ECM connector. Wiggle the harness while checking for intermittent opens.
  4. Check for battery voltage on the coil power feed with ignition ON; verify good engine/chassis ground present at coil bracket/harness ground.
  5. Measure coil primary and secondary resistance against manufacturer specs; if out of range, replace the coil.
  6. Swap the #4 coil (or coil-on-plug) with a known-good coil from another cylinder. Clear codes and run engine; if misfire/DTC moves to the other cylinder, the coil is faulty.
  7. If coil appears good, backprobe the coil primary while cranking or running with a scope or digital meter to verify driver pulses from the PCM. No pulses indicates open or driver fault.
  8. If driver pulses are absent but wiring continuity from PCM to coil is OK, suspect PCM/ignition module driver fault. Confirm wiring and grounds before replacing control module.
  9. Repair any damaged wiring, connectors, or replace faulty coil/igniter. Clear codes and perform a test drive to confirm repair.
  10. If intermittent, perform wiggle tests and road test with data logging to reproduce the fault before replacing components.

Likely causes

  • Damaged connector or wiring harness to cylinder 4 coil
  • Failed coil or integrated igniter on cylinder 4
  • Blown fuse or open power feed to ignition coils
  • Poor ground at engine/coil bracket or harness ground
  • ECM/PCM driver fault (less common)

Fault status

⚠️ Status
Cylinder 4 ignition/misfire circuit open. PCM detected loss of ignition driver/continuity for cylinder 4 causing a misfire. Check coil, connector, wiring, power/ground and PCM driver.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
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