Direct Fuel Injection
Page 3B-60 90-8M0050731 MAY 2011
NOTE: Checking resistance on a direct injector while still installed in the engine can be difficult. An easy and fast way to make
resistance checks on direct injectors is to use service harness P/N 84‑879346A49. This harness is normally used as a service
replacement part for the direct injector connector if it becomes damaged, but also works well to test the injector when it is in place
between the cylinder head/block and fuel rail.
Direct Injector Resistance Test
Meter Test Leads
Meter Scale Reading (Ω)
Red Black
Injector pin Injector pin Auto 1–1.6
Each injector pin Ground Auto > 1000
DMT 2004 Digital Multimeter 91‑892647A01
Direct Injector Harness 84‑879346A49
Direct Injector Tests
Direct Injector Leak Test
1. Attach the leakage tester kit to the discharge side of the direct injector.
2. Pump up the leakage tester to 172.4–206.8 kPa (25–30 psi).
3. The direct injector should not leak‑down more than 3.5 kPa (0.5 psi) in one minute. Replace the direct injector if it does not
meet the specifications.
a - Leakage tester kit
b - Direct injector
Leakage Tester Kit FT8950
Direct Injector Ohm Test
Use the DMT 2004 digital multimeter to complete the following tests.
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