Fault Tree: P2015 Intake Manifold Runner Position

Decision flow

1. Step 1 - Confirm the code context
   • Read freeze-frame: RPM/load/temp. Note if it happens at idle, cruise, or during tip-in.
   • Check for related codes (MAF, MAP, throttle, misfire, vacuum leak) that could confuse runner position behaviour.
2. Step 2 - Visual and mechanical check (most common)
   • Inspect runner linkage, levers, and stops on the intake manifold. Look for broken plastic arms, missing clips, or excessive play.
   • If accessible, move the linkage by hand: it should move smoothly to its stop without binding.
   If the linkage is loose or the stop is worn, you may need a repair kit or manifold depending on design.
3. Step 3 - Command the actuator (scan tool)
   • Use actuator tests (if available) to command runner open/close and watch the position PID.
   • If commanded state changes but position does not, decide: actuator is not moving (mechanical/electrical) or sensor feedback is wrong.
4. Step 4 - Electrical basics: power, grounds, and 5V reference
   • Backprobe the position sensor: verify 5V reference (if used), signal, and ground integrity.
   • Check for intermittent open circuits by wiggling the harness at the connector and along the loom.
   Use: 5V reference & sensor grounds ->
5. Step 5 - Wiring plausibility and voltage drop
   • Check connector pins for corrosion, spread terminals, or oil contamination.
   • If the actuator is motor-driven, confirm it has battery power and a good ground under load (voltage drop test).
   Deep-dive: Voltage drop testing ->
6. Step 6 - Confirm the fix
   • Clear codes, run the actuator test again, and road test under similar load to the freeze-frame.
   • Recheck for pending codes and confirm runner position PIDs behave logically.