Applicable Systems
OBD-II
Symptoms
Fuel injector circuit open for bank 1; ECM cannot control fuel delivery to those cylinders; engine may misfire or not start.
Possible Causes
- Fuel injector wiring open circuit
- Injector connector disconnected
- ECM injector driver failure
Troubleshooting Steps
- Step 1: Check injector resistance (12-17 ohm typical)
Resistance within range - Step 2: Check injector connector for corrosion
Connector clean and seated - Step 3: Check injector pulse with noid light
Noid light flashes (pulsing) - Step 4: Trace wiring from injector to ECM for opens
No open circuits found - Step 5: Replace injector or repair wiring as needed
All injectors pulse correctly
How to Reset
Clear DTC with OBD-II scanner after repair.
Common Replacement Parts
- Fuel Injector (OEM spec)
Frequently Asked Questions
- Q: What is Bank 1 vs Bank 2?
Bank 1 = cylinder bank with cylinder #1. Bank 2 = opposite bank on V-configuration engines. Inline engines only have Bank 1.
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Source: SAE J2012 standard DTC list + OBD-II portal
Category: OBD-II
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