Diagnostic Test Mode No. 2 (Function Testing)

Press test button 2 times to activate test mode No. 2. LED should flash rapidly. ECU should deliver an acknowledgment code when a signal is received from the following:

• 3-3-2 - Throttle switch (when throttle leaves idling position).
• 3-3-3 - Throttle switch (when throttle leaves full-load position).
• 1-1-4 - Ignition system ECU (when cooling fan is running).
• 1-3-4 - Low-pressure switch (when A/C compressor starts).
• 1-2-4 - AW50-42 A/T ECU (when gear selector lever is moved to or from a drive position.
• 3-3-1 - Ignition system ECU (when transmitting speed signals).