P0202

Code

ISUZU P — Powertrain

Injector Circuit - Cylinder 2

Brand: ISUZU

Type: P — Powertrain

Views: UK: 16 EN: 29 RU: 25

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Page language: EN

Read freeze-frame and live data for misfire and injector status
Visually inspect injector #2 connector and wiring for corrosion, damage, or loose pins
Check relevant fuses and relays for injector power
Wiggle test wiring with engine running (or cranking) to reproduce fault
Measure injector coil resistance at the connector (compare to spec)
Swap injector #2 with another cylinder (if practical) to see if code follows the injector

Typical injector coil resistance: low-impedance injectors ~0.5–3 Ω; high-impedance injectors ~8–18 Ω — consult OEM spec for exact value
One injector terminal usually at battery voltage (B+); the ECM switches the other terminal to ground or provides a PWM signal
With engine cranking/running expect pulsed signal; pulse width varies with load and rpm (typical 1–10 ms, longer at low RPM/high load)
Connector voltage idle/crank: B+ on power side (~12 V); switched side will show pulsed 0–12 V when active
Continuity to ECM: near 0 Ω to ground for the driver return path when measured per manual; consult wiring diagram for exact pin-to-pin

Retrieve and record freeze-frame data and any additional stored codes. Note whether misfire DTCs are present.
Perform visual inspection: check connector pins at injector #2, harness for damage, signs of oil/water intrusion, and secure routing.
Verify power and ground: with ignition ON, check for battery voltage at the injector power pin and good chassis/ECM ground reference.
Measure injector coil resistance at the connector (with connector disconnected). Compare to OEM specification. Replace injector if out of range.
Back-probe the injector connector while cranking/running. Use a lab scope if available to confirm proper switching waveform and pulse width. Look for missing pulses, stuck high/low, or abnormal waveform shape.
Check continuity between the injector connector and the ECM driver pin. Repair any open or high-resistance wiring found.
If wiring and injector test good, perform an injector swap with a known-good injector (swap with another cylinder). Clear codes and see if P0202 follows the injector or stays with cylinder 2 (helps isolate injector vs wiring/ECM).
If the fault stays on cylinder 2 after swapping injectors, suspect ECM driver failure. Confirm with bench tests or consult OEM procedures before replacing ECM.
Repair or replace failed components (connector repair, wiring replacement, injector replacement, fuse/relay, or ECM).
Clear codes and perform a test drive/verify that the fault does not return and that engine runs normally.

Corroded or loose connector at injector #2
Broken wire or poor continuity in the cylinder 2 harness between injector and ECM
Injector coil resistance out of specification (internal failure)
ECM driver transistor for injector #2 has failed
Blown injector power fuse or bad main relay affecting injector rail

⚠️ Status

Injector Circuit — Cylinder 2 (electrical fault detected in injector circuit for cylinder 2)

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.5 hours

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P0202 — Injector Circuit - Cylinder 2