Check for Intermittent Problems

2AZ-FE ENGINE CONTROL SYSTEM: SFI SYSTEM:

CHECK FOR INTERMITTENT PROBLEMS

HINT: Inspect the vehicle's ECM using check mode. Intermittent problems are easier to detect with Techstream when the ECM is in check mode. In check mode, the ECM uses 1-trip detection logic, which is more sensitive to malfunctions than normal mode (default), which uses 2-trip detection logic.

1 Clear the DTCs (DTC Check / Clear).
2 Switch the ECM from normal mode to check mode using Techstream (Check Mode Procedure).
3 Perform a simulation test.
4 Check and wiggle the harness(es), connector(s) and terminal(s).