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• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
• | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
• | Diagnostic Procedure Instructions provide an overview of each diagnostic category. |
When performing the fuel injector balance test, the scan tool is first used to energise the fuel pump. The scan tool is then used to pulse each injector for a precise amount of time, allowing a measured amount of fuel to be injected. This causes a drop in the system fuel pressure that can be recorded and used to compare each injector.
• | Monitoring the Cylinder 1-4 Current Misfire Counters may help to isolate the fuel injector that is causing the condition. |
• | Operating the vehicle over a wide temperature range may help isolate the fuel injector that is causing the condition. |
Hybrid Modes of Operation Description
Control Module References for scan tool information
CH 48027 Digital Pressure Gauge
For equivalent regional tools, refer to Special Tools : Diagnostic Tools .
Note:
• DO NOT perform this test if the engine coolant temperature (ECT) is above 94°C (201°F). Irregular fuel pressure readings may result due to hot soak fuel boiling. • Verify that adequate fuel is in the fuel tank before proceeding with this diagnostic. • Before proceeding with this test review the User Manual CH 48027-5 for Safety Information and Instructions.
Note: New test results will not be recorded if the Min/Max results are not cleared after each injector is tested.
⇒ | If the difference between any individual pressure drop and the average pressure drop is more than 20 kPa (3 psi), replace the fuel injector. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
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